JP3032049B2 - Still video camera with dimensional error display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a still video camera capable of recording distance information, zoom information and aperture information at the time of focusing of an imaged object or a scale pattern generated by calculating the information together with the object image on a recording medium. More specifically, the present invention relates to a still video camera with a dimensional error display that displays how much error is included in the scale together with the scale.

[0002]

2. Description of the Related Art The applicant of the present invention has proposed a still video camera in which a dimensional pattern can be included in an image of a subject in order to easily and accurately know the size of a captured subject image. In this proposal, the position of the focus adjustment lens is automatically set by the AF function, and the scale displayed on the subject is calculated based on the lens position information at that time. In the calculation of the scale, the dimensional accuracy depends on the accuracy of the lens position information, that is, the information of the distance to the subject.

[0003]

The accuracy of the distance information generally varies depending on the lighting conditions and the like. Therefore, the scale error varies every time shooting is performed, and the length of the subject on the playback screen is scaled. When reading, it was not possible to know how much dimensional error was included. An object of the present invention is to obtain a depth of field and calculate a dimensional error at the same time as acquiring information for scale calculation in scale mode imaging, and record the dimensional error together with information or scale pattern for scale calculation on a recording medium. Accordingly, it is an object of the present invention to provide a still video camera with a dimensional error display that enables a dimensional error display in a scale display mode during reproduction.

[0004]

In order to achieve the above object, a still video camera with a dimensional error display according to the present invention, when a scale mode is set, a subject image formed on an image sensor through a lens system. A still video camera for recording, on a recording medium, a focus pattern, zoom information, distance information, aperture information, or a scale pattern generated by calculating these information together with a subject image, wherein a focal length obtained at the time of the scale mode photographing is provided. The depth of field is calculated from the information and the aperture information, the range of the dimensional error is calculated from the depth of field, and the range of the dimensional error is recorded together with the subject on the recording medium. Control means for recording with the pattern is provided so that a scale with a dimensional error can be displayed during reproduction.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the drawings. FIG. 1 is a circuit block diagram showing an embodiment of a still video camera with a dimensional error display according to the present invention. This figure shows only a part directly related to the present invention, and is an example of a camera that inserts a scale pattern into a subject image and records the scale pattern on a recording medium. In order to obtain a reproduced image, the camera must be mounted on a reproducing apparatus, or a recording medium taken by the camera must be mounted on the reproducing apparatus.

The image pickup system includes a lens system 1, a diaphragm 2, and C
It is configured to include the CD imaging device 3. The lens system 1 includes a master lens, a focusing lens, a variable power lens (zoom lens), and the like.
Is arranged. The lens drive control unit 16 includes the lens system 1
, A driving unit for driving the focusing lens and the variable power lens, and a control unit for controlling these. The aperture control unit 17 includes a drive unit that drives the aperture and a control unit that controls the drive unit.

When the CPU 7 activates a CCD driver (not shown) and drives the CCD image pickup device 3, a subject image is taken into the image pickup circuit 4 through image pickup system means, and is further formed into a predetermined video signal by the signal processing circuit 5, which is not shown. The image is displayed on the electronic viewfinder. The imaging circuit 4 sends a part of the luminance signal to the CPU 7 together with the above operation. CPU
Reference numeral 7 extracts a high-frequency signal from the luminance signal, and sends a drive signal to the lens drive control unit 16 and the aperture control unit 17 based on the high-frequency signal.

When a photographing trigger signal is input by operating a release button (not shown), the CPU 7 sends a control signal to the CCD driver to cause the CCD image pickup device 3 to discharge charges accumulated so far, and starts transfer. After the shutter time, the transfer ends. CCD image sensor 3
Is sent to the imaging circuit 4, and the video signal is sent to the signal processing circuit 5. The signal processing circuit 5 inserts a synchronization signal or the like into the transmitted video signal to create a predetermined video signal. The recording circuit 6 performs an emphasis process on the video signal from the signal processing circuit 5 to perform FM modulation, and further adjusts a recording current based on the FM modulation signal to record the video signal on a predetermined track of the video floppy.

When the CPU 7 is set to the scale mode, the CPU 7 performs a predetermined calculation based on the lens position information and the zoom information at the time of focusing sent from the lens system 1 and the aperture information sent from the aperture. Output information about When the photographing trigger signal is input, information on the scale is sent to the scale generator 9 and a timing control signal is sent to the timing generator 8. The timing generator 9 sends a timing signal to the scale generator 9 according to a predetermined timing of the video signal sent from the imaging circuit 4. As a result, the scale pattern is output from the scale generator 9 and the video floppy 1
The scale pattern is inserted at a predetermined position of the subject image recorded in No. 4.

A video floppy drive system includes a motor 13 for rotating a video floppy 14, a driver 12 for driving the motor 13, and a servo circuit 11 for controlling the driver.
The video floppy 14 is rotated at a predetermined speed and phase under the control of the CPU 7. The video head 15 is moved to an empty track of the video floppy 14 designated by the CPU 7 by a magnetic head drive system (not shown).

A scale mode key 18 connected to the CPU 7 performs a predetermined operation based on lens position information and the like taken in by the CPU 7 to generate a scale pattern, and inserts a scale into a part of a subject image recorded on the video floppy 14. Key for setting the mode for performing At the same time, the dimensional error range calculated by the CPU 7 is inserted into a part of the subject together with the scale pattern.

Next, the operation and operation when shooting in the scale mode will be described. When the photographer presses the scale mode key 18 to set the scale mode and half-presses a release button (not shown), the luminance signal of the imaging circuit 4 created by the electric signal input from the imaging system means becomes C
It is sent to PU7. The CPU 7 extracts a high frequency signal from the luminance signal, and controls the lens drive control unit 16 and the aperture control unit 17 based on the high frequency signal. As a result, the focus adjustment lens is brought to the in-focus position and the aperture is adjusted to an appropriate aperture. The lens drive control unit 16 and the aperture control unit 17 send lens position information, zoom information, and aperture information to the CPU 7. . The CPU 7 calculates the scale based on the principle described in FIG. 2 based on the lens position information and the like.

FIG. 2 is a diagram for explaining a method of obtaining a scale value from lens position information (distance) and the like. The length L can be obtained from the equation (1) using the distance D and the zoom information, that is, the angle of view Θ as variables. L = D × tanΘ (1) The length of the scale is twice the length L. Further, the focal length is obtained from the lens position information and the zoom information, and the depth of field is obtained from the focal length, the aperture information, and the distance information. The distances to the objects at the foremost and farthest positions in the range of the depth of field are defined as D ₁ and D ₂ , respectively, in the above (1).
L with respect to the distance D ₁ and D ₂ calculates the formulas ₁ and L ₂
That is, the scale lengths 2L ₁ and 2L ₂ are obtained.
Then, the dimensional error −Δ2L ₁ = (2L ₁ −2L) and Δ2L
Calculating ₂ = a (2L-2L _2).

Next, when the release button is depressed, a photographing trigger signal is input, and the CPU 7 sends the scale value and its dimensional error to the scale generator 9. Then, the scale generator 9 generates a scale value and a scale pattern and a character pattern corresponding to a dimensional error thereof at a timing of being inserted into a predetermined position of the video signal of the subject based on the timing signal sent from the timing generator 8. The signal processing circuit 5 inserts the scale pattern and the character pattern into the video signal of the subject,
The video signal of the subject into which the scale and the dimensional error are inserted is recorded on a predetermined track of the video floppy 14 by the recording circuit 6. FIG. 3 is a diagram illustrating an example of a reproduced image of a subject on which a scale and a dimensional error are displayed. A scale 21 is displayed at the bottom of the screen where the subject 20 is shown, and a numerical value indicating the scale and a unit 22 are attached. Further, a dimensional error 23 is displayed on the right of the scale 21. This example of the scale shows a case where the entire width of the scale is 1 m and the dimensional error is (+0.3 to -0.2) m.

In this embodiment, a case has been described in which a scale pattern is inserted into a video signal of a subject and recorded. However, the stage before generation of the scale pattern, that is, lens position information for calculating the scale, etc. Track other than the track that records the video signal of
It may be recorded on ID information or Q track. In such a case, it is necessary to make the control unit on the reproducing apparatus have a function of performing an operation and to provide a scale generator and the like, and it becomes possible to select the scale insertion for the reproduced image.

[0016]

As described above, the still video camera with the dimensional error display according to the present invention calculates the depth of field from the focal length information and the aperture information obtained at the time of scale mode shooting, and calculates the dimensional from the depth of field. Control means for calculating the range of the error and recording this range of the dimensional error together with the information for scale display or the scale pattern to be recorded on the recording medium together with the subject, so that the scale display with the dimensional error can be displayed during reproduction. It was done. Therefore, according to the present invention, it is possible to display a scale with a dimensional error, and to recognize how much error the scale contains.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram showing an embodiment of a still video camera with a dimensional error display according to the present invention.

FIG. 2 is a diagram for explaining the principle of scale calculation.

FIG. 3 is a diagram illustrating an example of a reproduced image of a subject on which a scale and a dimensional error are displayed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Lens system 2 ... Aperture 3 ... CCD 4 ... Imaging circuit 5 ... Signal processing circuit 6 ... Recording circuit 7 ... CPU 8 ... Timing generator 9 ... Scale generator 11 ... Servo circuit 12 ... Driver 13 ... Motor 14 ... Video floppy 15 ... Video head 16 ... Lens drive control unit 17 ... Aperture control unit 18 ... Scale mode key

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04N 5/225 G03B 19/02 H04N 5/278

Claims (1)

(57) [Claims] 1. When a scale mode is set,
Still video that records focusing information, zoom information, distance information, and aperture information of a subject image formed on an image sensor via a lens system, or a scale pattern generated by calculating the information together with the subject image on a recording medium. A camera that calculates a depth of field from focal length information and aperture information obtained at the time of the scale mode shooting, calculates a range of a dimensional error from the depth of field, and records the range of the dimensional error in the recording. A still video camera with a dimensional error display, characterized in that a control means for recording together with information for scale display or a scale pattern recorded on a medium together with a subject is provided so that a scale with a dimensional error can be displayed during reproduction.