JPH0746870B2 - Film image observation auxiliary device - Google Patents

Description

Description: INDUSTRIAL APPLICABILITY The present invention is used for observing an image recorded on a color steel film, that is, a color positive film or a color negative film through a video camera on a monitor television receiver. The present invention relates to a film image observation assisting device.

2. Description of the Related Art Conventionally, various auxiliary devices used for observing a color steel film photographed by a still camera with a monitor television receiver through a color video camera have been put into practical use, and FIG. 6 shows an example thereof. The schematic block diagram of is shown.

In FIG. 6, 1 is a light source, 2 is a heat ray absorption filter, 3 is a positive or negative color filter, 4 is a diffusion plate, and 5 is a film holder on which a color steel film F is mounted,
Reference numeral 6 denotes a mirror, and 7 denotes a mounting structure of a video camera 8 including a close-up lens.

In the structure as shown in the figure, after mounting the color steel film F on the film holder 5 and selecting the color filter 3 according to the mounted film F, when the light source 1 is turned on, the light passes through the filter 3, the film F and the like. Light is mirror 6
The reflected light is further reflected, and the reflected light is imaged on the image plane of the video camera 8 which is optically and mechanically connected via the mounting structure 7 including the close-up lens.

As a result, the image photographed on the color steel film F is converted into a video image signal and can be observed by a monitor television receiver (not shown).

However, it is generally known that a color steel film photographed by a still camera causes a large difference in its color tone and density depending on the conditions at the time of photographing, and therefore, in the observation operation in the above-mentioned conventional apparatus, normally, It is necessary to adjust the hue, brightness, etc. on the TV screen while visually observing the monitor TV screen by an appropriate adjusting knob provided on the monitor TV or the video camera. That is, the adjustment operation as described above has to be performed every time the film is replaced.

On the other hand, the points as described above are common to well-known color steel film printing apparatuses, that is, even in the printing apparatus, it is necessary to appropriately adjust the difference in color tone and density of the film.
It has the same troublesomeness in operation. However, in such a field, in recent years, a system for automatically notifying the adjustment state has been put into practical use. For example, systems have been developed that can instruct the adjustment amount of the above-mentioned adjustment knob.

Therefore, even in the field of the auxiliary device described at the beginning which is the subject of the present invention, there is a strong demand for simplification of the adjusting operation of the printing device as described above.

Problems to be Solved by the Invention As described above, in the conventional auxiliary device for observing a film image, it is extremely troublesome to adjust the color tone and the density for each film, and the adjustment amount is different from that in the printing device. Even if it becomes possible to inform the user, it is necessary to manually operate the adjustment knobs one by one in the end, and the film image can be easily monitored via the video camera by a simple operation. It has a problem that it cannot be observed with a John receiver.

The present invention has been made in consideration of the above problems,
Large area average transmission densities for three primary colors in a standard color steel film were previously disclosed in JP-A-52-156624, JP-A-53-149329 and JP-A-55-88043.
The average transmission density of the so-called entire film screen expressed by the word "ATD" is calculated), the standard density ratio is calculated and output, and this standard density ratio and the large area average for the three primary colors in the color steel film to be observed An object of the present invention is to provide a film image observing auxiliary device capable of controlling the correction state of the color correction means by comparing the density ratio obtained by measuring the transmission density and supplying the light of the optimum color balance to the video camera.

Means for Solving the Problems A film image observation auxiliary device according to the present invention comprises a light source which emits light containing wavelengths of all necessary colors, a cyan filter,
A first optical system that includes a color correction unit including a magenta filter and a yellow filter, a diffusion plate, and a half mirror to guide a part of the light emitted from the light source to the video camera, and the color steel film to be observed is the first optical system. A film holder that holds the light so that it is positioned in the system, a density measuring unit that measures a large area average density of the three primary colors of the supplied light, and a part of the light supplied to the half mirror. And a mounting structure for optically and mechanically connecting the first optical system and the video camera to each other to guide the light to the above-mentioned density of the light supplied to the half mirror that is not guided to the video camera. The second optical system leading to the measuring means and the filters of the color correcting means are independently moved to automatically control the ratio of each of the filters included in the first optical system. A driving means and a manual driving means, a driving control means for controlling the operation of the driving means, and a density measuring means when an optimum color balance is obtained by mounting a standard film uniformly containing all hues on the film holder. The density ratio obtained by the output of the density measuring means when the film to be observed is mounted on the film holder is included in the reference density ratio. And a control means for outputting a control signal for controlling the color correction means and supplying the same to the drive control means so that both density ratios have a predetermined relationship based on the comparison result. .

Action Since the film image observation assisting device according to the present invention has the above-mentioned configuration, first, the standard color steel film uniformly containing all the hues is arranged in the first optical system, and the video camera is arranged. Alternatively, if the optimum color correction state is set in consideration of the characteristics of the monitor television receiver, the large area average transmission densities of the three primary colors in that state are measured and the density ratio is stored as the first density signal. , Therefore, the color steel film you want to observe first
, The density ratio is stored as the second density signal by measuring the large area average transmission density of the three primary colors, and is compared with the first density signal so that a predetermined relationship is established. The drive control means and the drive means are operated by the means, and the three filters, which are the color correction means, are appropriately moved independently. As a result,
Optimal color correction can be automatically performed for various films to be observed.

Embodiment FIG. 1 is a schematic configuration diagram of an embodiment of a film image observation assisting device according to the present invention, and those having the same reference numbers as in FIG. 6 have the same functional configuration.

In the figure, 9 shows a color correction means for controlling the hue of light projected from the light source 1 consists of a cyan filter 9 _1, magenta filter 9 _2, yellow filters 9 _3.

Reference numeral 10 denotes a condenser lens that condenses the light supplied through the diffusion plate 4, and 11 denotes a half mirror that divides the light supplied through the condenser lens 10 into two directions. Together with the plate 4, the first optical system O ₁ for guiding the light projected from the light source 1 to the video camera 8 is formed.
The diffuser plate 4 diffuses the light transmitted through the color correction means 9 so that its hue becomes uniform, and holds the color steel film to be observed, as is apparent from FIG. The film holder 5 is the first optical system.
It is arranged between the condenser lens 10 and the half mirror 11 in O ₁ .

Reference numeral 12 denotes a diffuser plate that diffuses the supplied light and makes all the hues uniform, and the density measuring means, which will be described later, of the light supplied to the half mirror 11 that is not guided to the video camera 8. The second optical system O ₂ which leads to 13 is formed.

Denoted at 13 is a density measuring means, which is a color filter group 14 composed of filters 14 ₁ , 14 ₂ and 14 ₃ for transmitting only red, blue and green light, respectively.
The diffuser plate comprises an optical sensor group 15 for receiving the light supplied through the color filter group 14, that is, three primary color lights, and an A-D converter 16 for amplifying the received light output of the optical sensor group 15 and converting it into a digital signal. This is for measuring the transmission densities of the three primary colors of the light which has reached 12 and in which all the hues have been diffused uniformly, that is, the so-called large area average transmission densities.

Reference numeral 17 denotes a control means, which is a storage unit 1 for receiving the concentration signal from the concentration measuring means 13 and storing the signal as a concentration ratio.
7 ₁ , comparison processing unit 17 for comparing the stored contents of this storage unit
₂ and an output signal for controlling the operation of the driving means 19 which will be described later based on the comparison result of the comparison processing section 17 _2.
It comprises a control output unit 17 ₃ for outputting to 18.

18 is a drive control means receives the output signal from the control output unit 17 ₃ of the control section 17, the three constituting the color correction unit 9 filter 9 _1, 9 _2, a plurality of for moving 9 ₃ each independently Drive source
It is for outputting a drive control signal for controlling the operation of the drive means 19 composed of 19 ₁ , 19 ₂ and 19 ₃ .

Reference numeral 20 indicates a manual drive means for independently moving the _three color filters 9 ₁ , 9 ₂ , 9 ₃ independently.

In the above embodiment, the light emitted from the light source 1 has its hue controlled by the color correction means 9 and is diffused by the diffusion plate 4, and reaches the half mirror 11 via the condenser lens 10 and the film holder 5. become.

Most of the light that reaches the half mirror 11 is reflected and is incident on the video camera 8 through the appropriate mounting structure 7, and a part of the light is transmitted through the diffusion plate 12 and the color filter group 14 to the optical sensor group 15.
Will be incident on.

It is needless to say that when the color steel film F having an appropriate subject image is mounted on the film holder 5, the subject image is formed on the image pickup surface of the video camera 8 by the light. Absent.

That is, in the device according to the present invention, the light from the light source 1 is made incident on the video camera 8 via the _first optical system O ₁ , and at the same time, the concentration is measured via the _second optical system O _2. When it is supplied to the means 13 and a film is mounted, the film image is formed on the image pickup surface of the camera 8 and the large area average transmission densities of the three primary colors are measured.

Now, the film image observing operation of this embodiment will be described below.

In the present embodiment, as described above, the standard color steel film that uniformly contains all the hues is first attached to the film holder 5 to automatically control the color tone of the appropriate color steel film. Therefore, the standard state setting operation is performed.

It goes without saying that such an operation is an operation that takes into consideration the characteristics of the video camera 8 or a monitor television receiver itself (not shown). Specifically, a standard color steel film is attached to the film holder 5, This is performed by adjusting the color correction means 9 so that the color balance is optimum on the screen of the monitor television receiver.

If the above adjustment is performed and the optimum state is obtained, the large area average transmission density of the three primary colors of the light supplied to the density measuring means 13 at that time is measured, and the density ratio is used by the control means 17. It is stored as a standard value corresponding to the existing video camera 8 or the like.

Next, the color steel film F to be observed is mounted on the film holder 5 in place of the standard color steel film.

When the film F to be observed is mounted, the large area average transmission density of the three primary colors of the light transmitted through the film F is measured by the density measuring means 13 as in the case of the standard film, and the control result is measured by the control means 17. Is supplied and the concentration ratio is calculated.

Then, the control means 17 compares the density ratio in the case where the optimum color balance is obtained when the standard film is stored, which is stored in advance, and the density ratio when the film to be observed is mounted in the comparison processing unit 17 _2. , the comparison result on the basis of the control output unit 17 ₃ outputs an appropriate control signal to the drive control means 18,
It operates to control the color correction means 9 so that the two density ratios have a predetermined relationship.

That is, the control unit 17 compares the two density ratios described above to drive control each filter forming the color correction unit 9 so that the driving unit 19 moves the two density ratios so that the two density ratios have a predetermined relationship. A control signal for controlling the means 18 is output.

The drive control means 18 receives the control signal from the control means 17 to drive the drive means 19 as appropriate, and as a result, each filter forming the color correction means 9 can be independently moved as appropriate. The color correction means will be changed.

At this time, the change in the color correction state by the color correction unit 9 described above is detected by the density measuring unit 13 via the second optical system O ₂ , that is, as a change in the density value of the film F to be observed as described above. Will be detected.

Accordingly, the comparison processing operation results in the concentration ratio and the comparison processing unit 17 _2, which is calculated in the control circuit 17 also goes without saying that changes with the movement of the filter, and, the predetermined relationship as the comparison operation result the resulting control output unit 17 ₃ at the now outputs a control signal allowed to stop the filter moving operation by the drive unit 19 to the drive control means 18, automatic color correction operation according to the present invention apparatus ends in such time It will be done.

The observation operation in the embodiment shown in FIG. 1 has been described above, but it is preferable that the control means 17 for storing / comparing the density ratios of the three primary colors and controlling the color correcting means 9 is constituted by a microcomputer. A specific example will be described with reference to the flowchart shown in FIG. Incidentally, B, G, and R shown in FIG. 2 are the three primary colors obtained by the density measuring means 13 when the standard color steel film is attached and the optimum color balance is obtained by the operation of the manual driving means 20. The density outputs B ', G', and R'indicate the density outputs of the three primary colors obtained by the density measuring means 13 when the observation film is mounted, and the drive control means 18 controls the density ratio of the three primary colors in the standard film. It should be done so that the density ratios of the three primary colors in the film are equal.

Now, the control circuit 17 first receives the large area average transmission density output of the three primary colors from the density measuring means 13 in step 200 when the optimum color balance is obtained when the standard film is mounted,
For example, the density ratios r and g based on the blue density output are stored. That is, in step 200, B / G = g and B / R = r are calculated, and g and r are stored.

Next, at step 201, it is judged whether or not the color steel film to be observed is newly mounted on the film holder 5, and if the film is replaced, the next step 202
Will be selected. Incidentally, the step 201 is
Needless to say, it can be easily realized by detecting the attachment / detachment of the film on the holder 5 with an appropriate switch means.

Step 202 is a step of first calculating g'of the density ratios g ', r'of the three primary colors of the mounted film. That is,
This step 202 is a step of detecting outputs B'and G'corresponding to blue and green among the three primary color density outputs and calculating g '= B' / G '. Before selecting step 202, is the level of each of the density outputs B'and G'output from the density measuring means 13 within the optimum level range determined by the precision of the microcomputer, the power supply voltage, etc.? A step of confirming whether or not, for example, when a signal having a too small or a large level is obtained, a step of notifying that the hue of the corresponding color needs to be appropriately adjusted within the level range may be added. Needless to say.

When step 202 is completed, step 203 is selected, the density ratio g stored in step 200 is compared with the density ratio g ′ obtained in step 202, and if the comparison result is g> g ′, step 204 is executed. When g <g ', step 205,
When g = g ', step 206 is selected.

Step 204 shows the case where the comparison result in step 203 is g <g ', that is, the density ratio of green to blue in the three primary color densities of the observation film is higher than that in the standard film, while As described above, the embodiment is an example in which the density ratio in the standard film and the density ratio in the observation film are made equal. Therefore, in the above case, it is necessary to reduce the green density ratio. 9 of the yellow filter 9 _{3 in} the optical path is reduced, or the magenta filter 9 ₂
Is a step of outputting a control signal for increasing the ratio in the optical path to the drive control circuit 18.

When the output of the control signal is started in step 204,
Step 202 is selected again, and the change in the density ratio g ′ based on the movement of the filter in step 204 is input to step 203, and the output state of the control signal is g
= G 'and step 206 is continued until it is selected.

On the other hand, step 205 shows the case where g <g ', that is, the green density ratio is small, contrary to step 204. Therefore, the ratio of the yellow filter 9 _{3 to} the optical path is increased or the magenta filter 9 ₂ is increased. Needless to say, this is a step of outputting a control signal for reducing the ratio of the above to the optical path to the drive control means 18, and the control signal output is output until g = g '. .

Step 206 is a step selected when the comparison result in step 203 is g = g ', and is a step of detecting the density outputs of blue and red and calculating another density ratio r'. is there. That is, in step 206, r '= B' / R '
Is a step for calculating.

When r'is calculated in step 206, the r'is compared with r described above in step 207. If the comparison result is r <r ', step 208 is determined, and if r <r', step is determined. When 209 becomes r = r ', step 210 is selected.

Step 208 is a step selected when the comparison result in step 207 is r <r ', that is, when the red density ratio with respect to blue is large, and the optical path of the cyan filter 9 ₁ is reduced to reduce the red density ratio. This is a step of outputting a control signal for increasing the ratio to the inside. When the control signal is output from step 208, step 206 is selected again, and the control signal is output until r = r ', as in steps 204 and 205 described above.

Further, step 209 is the reverse of step 208, that is, r <
r 'is a step that is selected in the case of a step of outputting a control signal for reducing the ratio of the optical path of the cyan filter 9 _1, the control output is similar step 208, r = r' until It will be output continuously.

Incidentally, other control cyan filter 9 ₁ adjustment of red density ratio as described above for the purpose of step 208, 209, are possible by control of the yellow filter 9 _3, major adjustment was made in the previous step 202, 203, etc. to Ku effect is obvious, it is not limited only to the adjustment by the cyan filter 9 _1.

When the comparison result of step 207 is r = r 'in step 208 or 209, step 210 is selected next,
Steps from step 202 to step 209, that is, g
And g ', r and r'comparison operation is preset N
A determination operation as to whether or not it has been performed is performed.

This step 210 is an operation in which the comparison operation in steps 203 and 207 is an operation for comparing the ratio of two colors among the three primary colors, and it is not possible to control only the colors corresponding to the characteristics of each filter. At the same time g = g ', r = r'
Is a step provided because it is virtually unthinkable. That is, even if r = r 'is obtained after g = g' is obtained, in most cases, the above relationship of g = g 'is not established at that time. This step is provided to reduce the number by appropriately increasing the number of times.

Therefore, if the comparison operation is not performed N times, the step 202 is selected again, and if it is performed, the process returns to the step 201, and thereafter, the steps after the step 202 are not performed until a new observation film is mounted. Become. That is, the apparatus is held in an optimum state for the currently mounted observation film that has undergone the above steps.

In the above, one specific example in which the control means 17 is configured by a microcomputer has been described, but it goes without saying that various other configurations are possible.

In the embodiment of the film image observation apparatus according to the present invention described above, the law that the densities of the three primary colors of red, blue, and green in a large area average transmission density of a general film are equal, that is, the well-known Evans's It can be said that this is an example based on the law.

However, in the case of a film taken with a subject whose hue is greatly biased, for example, a film taken at a golf course, the coast or a place with a red carpet, color correction based on Evans's law as described above. In operation,
Accurate color correction becomes extremely difficult.

That is, the color balance at the large area average transmission density is R >> B.
= G, if color correction is performed by the embodiment as shown in FIG. 2 based on Evans's law, it means that the image is overcorrected with respect to red, resulting in an image with less red. is there.

FIG. 3 is a schematic block diagram of another embodiment of the film image observing apparatus according to the present invention capable of correcting the hue deviation as described above. In FIG. 3, those having the same numbers as those in FIG. 1 have the same function. 3 illustrates members and means.

As is apparent from FIG. 3, this embodiment is different from the embodiment shown in FIG. 1 in the same position as the color correction means 9, that is, the light source 1.
Between this and the diffuser plate 4 and this ND filter 21
A moving means 22 for controlling loading / unloading of the optical path 21 is added.

That is, in the embodiment shown in FIG. 3, the large area average transmission densities of the three primary colors are measured in a state where each filter which is the color correction means 9 is removed from the optical path and the ND filter is attached, and for example, the density ratio to blue is detected. By detecting the color deviation of the film to be observed, the control means 17 'performs the color correction operation as described with reference to FIG. 2 and the color based on the density ratio when the color correction means 9 is not used. The correction operation for the bias of is performed. A specific example of the operation and the control means 17 'of the above embodiment will be described below with reference to the flowchart of FIG. The ND filter 21 functions to control the amount of light on the optical path when the color correction unit 9 is removed, that is, to prevent the output of the optical sensor group 15 of the density measuring unit 13 from being saturated. Needless to say, it is obvious that the moving means 22 can be included and replaced with means for appropriately controlling the brightness of the light source 1, for example.

Now, when the standard film is mounted on the film holder 5 in step 400 of FIG. 4, step 401 is selected and each filter forming the color correction means 9 is completely removed from the optical path, and instead the ND filter is used. 21 is placed in the optical path.

Next, step 402 is selected, and the large area average transmission densities B ₁ , G ₁ , and R ₁ of the three primary colors in the above state are measured by the density measuring means 13, and, for example, the density ratio α = B _{1 based on} blue.
/ G ₁ and β = B ₁ / R ₁ are calculated. Such α,
β is usually considered to be 1, but it does not become 1 if there is variation in the optical system or the concentration measurement system.
This is a step provided to compensate for it.

When step 402 is completed, step 403 is selected next, the ND filter 21 is removed from the optical path, and the color correction means 9 is placed in the optical path instead.

Next, step 404 is selected and the color correction means 9 is controlled by the manual adjustment means 20 so that the monitor television receiver has the optimum color balance, and the large area average transmission densities B, G, R of the three primary colors at that time are detected. Then, the concentration ratios g = B / G and r = R / r are calculated. Needless to say, such step 404 is the same step as step 200 described with reference to FIG.

When the above steps are completed, the next step 405
The standard film and the film to be observed or a new observation film will be exchanged at. That is, the observation film is mounted on the film holder 5.

When the observation film is attached, next in step 406,
As in step 401 above, the color correction means 9 is removed from the optical path, and the ND filter 21 is placed in the optical path.

Next, step 407 is selected and the large area average transmission densities B ₂ , G ₂ and R ₂ of the three primary colors in the above state are measured. For example, the color deviation amount based on blue is set as the density ratio x, y in the previous step. The calculation is performed in consideration of the concentration ratios α and β obtained in 402. That is, x = B ₂ / α · G ₂ and y = B ₂ / β · R ₂ are calculated.

When this step 407 ends, the same step 408 as the previous step 403 is selected, and the ND filter 21 is arranged outside the optical path and the color correction means 9 is arranged inside the optical path.

On the other hand, x and y obtained in step 407 are stored as appropriate correction values based on the relational table as shown in FIG. Become. That is, x is 0.85 ≦ x ≦ 1.1
5, y will be set to a value within the range of 080 ≦ y ≦ 1.20.

Now, assuming that the memory storing x and y is K and the reference state is the contents of address 1 shown in FIG. 5, the above state is first set in step 409. That is, the contents of K are reset to K (1), and x = 1 and y = 1 corresponding to address 1 in FIG. 5 are set.

Next, in step 410, x obtained in step 407 is obtained.
Is compared with one criterion 1.15, that is, x <1.15? Is calculated. If x is smaller than 1.15, step 411 is selected, and if smaller, step 412 is selected.

Step 411 is a step of designating address 2 in the relationship table of FIG. 5 in which only x is larger than the predetermined range because x is not smaller than 1.15, that is, larger than K. Add 1 to the content of
(2) is set.

In step 412, x is larger than the other reference, that is, x <0.85? Is calculated. If larger, step 413 is selected, and if smaller, step 414 is selected.

Step 413 is a step selected when x is smaller than 1.15 and smaller than 0.85, and is therefore a step of designating address 3 in the relation table of FIG. 5, which is a condition where x is smaller than a predetermined range. 2 is added to the contents of K reset to K (3).

Step 414 is a step that is selected when x is 0.85 or more in step 412 described above, or is selected even after step 411 or 413 is completed, and is a step for the other concentration ratio y.

That is, step 414 is a step for calculating y <1.20 ?, and if y is smaller than 1.20, step 415 is selected, and if smaller, step 416 is selected.

In step 415, y is larger than 1.20 in addition to the condition of x set in steps 410 to 414, and one of the addresses of 4, 5 and 6 in the relation table of FIG. 5 is set. To do. Therefore, it suffices to add 3 to the address contents of K set up to step 414, and an address corresponding to K + 3 is set as a new K.

Step 416 determines that Y is greater than the other criterion, ie y
> 0.80? Is calculated, and if larger, step 417 is selected, and if smaller, step 418 is selected.

Step 417 is a step to be selected when y is smaller than 1.20 and smaller than 0.80, so that y is a condition smaller than a predetermined range.
This is the step to select one of 8 and 9. Therefore, this is a step in which 6 is added to the address contents of K set up to step 414 and a new K is set.

Step 418 is selected even when y is 0.80 or more in step 416, or is selected even when step 415 or 417 is completed. In other words, steps 410 to 417 are selected based on x, y calculated in step 407. This is a step in which an appropriate correction value h, i based on x, y is determined and selected, and according to the determined correction value, the previous step 40
Correcting the reference density ratios g and r obtained in step 4, corrected reference density ratio g _s =
This is the step of obtaining g × h, r _s = r × i.

When the step 418 is completed and the corrected reference density ratios g _s and r _s are obtained, the apparatus is made to perform the same processing as the steps after step 202 described in FIG.

That is, g in steps 203 and 207 in FIG.
Instead of r and r, the processing operation using g _s and r _s obtained in step 418 is performed.

As a result, even if there is color bias in the observation film,
The biased state is detected as a density ratio for any color (in the above example, blue was used as a reference), and the reference density ratio g, r, which is the reference for considering the color balance, is the corrected reference density ratio based on the detection result in advance. Since it is set to g _s and r _s , it is possible to realize automatic optimum color balance adjustment without any problems, that is, without causing problems such as overcorrection of a specific color.

EFFECTS OF THE INVENTION As described above, the film image observation auxiliary device according to the present invention supplies a part of the light supplied to the video camera through the color correcting means to the density measuring means for measuring the large area average transmission density. This density measuring means detects the density output when a standard film is mounted and the optimum color balance is obtained on the monitor television receiver and the density output when the film to be observed is mounted, and both density outputs are detected. Control means, and the color correction state of the color correction means is controlled based on the comparison result, so once the optimum color balance is obtained with the standard film, the observation film can be mounted by simply mounting the film to be observed. The optimum color balance for the is automatically obtained, and the image of the color steel film can be displayed on the monitor television via the video camera with extremely simple operation. It has the effect of being observable with a receiver.

Even if the film to be observed has a color deviation, the optimum color balance can be obtained by mounting a standard film as a reference by selecting an appropriate correction value based on the measurement result of the density ratio by the density measuring means. Since the density ratio at the time of correction is corrected, there is an effect that the operation for automatically obtaining the optimum color balance of the observation film on the monitor TV screen can be expected without any problem.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of a film image observation assisting device according to the present invention, and FIG. 2 is a specific example in which the control means 17 shown in FIG. FIG. 3 is a flowchart showing the flow chart, FIG. 3 is a schematic configuration diagram of another embodiment of the film image observation auxiliary device according to the present invention, and FIG.
FIG. 5 is a flow chart showing a specific example of mounting operation when the control means shown in FIG. 17 'is constituted by a microcomputer, and FIG. 5 is used for the operation of steps 410 to 417 in the flow chart of FIG. It is a figure which shows correction value data. FIG. 6 is a schematic diagram of a conventional film image observation auxiliary device. 1 ... Light source, 4 ... Diffuser, 5 ... Film holder,
7 ... Mounting configuration, 8 ... Video camera, 9 ... Color correction means, 10 ... Condenser lens, 11 ... Half mirror, 12
...... Diffusion plate, 13 ...... Density measuring means, 14 ...... Color filter group, 15 ...... Optical sensor group, 16 ...... A-D converter, 17,1
7 '... control means, 18 ... drive control means, 19 ... drive means, 20 ... manual drive means, 21 ... ND filter, 22 ... moving means.

Claims (3)

[Claims] 1. A film image observing auxiliary device used for observing an image recorded on a color steel film on a monitor television receiver via a video camera, wherein all necessary wavelengths of colors are provided. A light source that emits the included light,
A color correction unit configured to include a cyan filter, a magenta filter, and a yellow filter to control and transmit the hue of the light projected from the light source, and to make the hue uniform by receiving the light transmitted through the color correction unit. A diffuser plate that diffuses the light to a condenser lens, a condenser lens that receives the light that is supplied through the diffuser plate, and a light that is supplied through the condenser lens.
A first optical system that includes a half mirror that divides light in a direction and guides a part of light emitted from the light source to the video camera, and is arranged between the condenser lens and the half mirror in the first optical system for observation. A film holder for holding a desired color steel film, a density measuring means for measuring the large area average transmission density of the three primary colors of the supplied light, and the first optical system and the video camera optically and mechanically. A device configuration that connects and guides one of the lights split by the half mirror to the video camera, and diffuses the hue of the light split by the half mirror that is not guided to the video camera evenly. Then, the second optical system leading to the density measuring unit and the filters of the color correcting unit are independently moved so that the proportion of each filter included in the first optical system is adjusted. A drive means and manual means for controlling the drive control means for controlling the operation of said driving means,
A storage unit for mounting a standard film uniformly containing all hues on the film holder and receiving a density output output from a density measuring unit when an optimum color balance is obtained and calculating and storing a reference density ratio for a predetermined color. Including, the density ratio by the output of the density measuring means when the film to be observed is mounted on the film holder is compared with the reference density ratio, and based on the comparison result, both density ratios have a predetermined relationship. A film image observation assisting device comprising: a control unit that outputs a control signal for controlling the color correction unit and supplies the control signal to the drive control unit. 2. The control means receives the density output from the density measuring means when the color correcting means is removed from the first optical system, detects the density ratio for a predetermined color in advance, and based on the detection result, the reference density. The film image observation assisting device according to claim (1), which includes a correction unit for correcting the ratio and is capable of correcting the color deviation due to the color steel film to be observed and the first and second optical systems. 3. The control means receives the three primary color density outputs from the density measuring means when a standard film including all hues is mounted and optimum color balance is obtained, and the density of green and red with respect to blue is obtained. A storage means for calculating the ratio and storing it as the first and second density ratios, and a density output ratio of green to blue for receiving the density output from the density measuring means when the color steel film to be observed is mounted First computing means for computing as a density ratio, first comparing means for comparing whether the first density ratio and the third density ratio are equal, and the first density ratio is the third density. A first signal output means for outputting a control signal selected when the ratio is larger or smaller than the ratio to control the color correcting means so that the first and third density ratios are equal; the first density ratio and the first density ratio; Select when the density ratio of 3 becomes equal Second computing means for receiving the density output from the density measuring means when the color steel film to be observed is mounted and computing the density output ratio of red to blue as a fourth density ratio; and the second density ratio. And the fourth density ratio are equal to each other, and second comparing means for comparing whether the second density ratio is larger or smaller than the fourth density ratio. , Fourth
The second signal output means for outputting a control signal for controlling the density ratios of the first and second density ratios to be equal to each other, and the first and second comparison means selected when the second density ratio and the fourth density ratio are equal. Determine whether it has been performed a predetermined number of times set in advance,
If the operation has been performed, the operations of the first operation means, the first comparison means, the first signal output means, the second operation means, the second comparison means, and the second signal output means are stopped, and if not, the operation is performed again. Claims comprising a first operation means, a first comparison means, a first signal output means, a second operation means, a second comparison means and an operation control means for operating the second signal output means. The film image observation assisting device according to item (1).