JP5380966B2 - Projector, projector control program, and light source control method - Google Patents

Description

  The present invention relates to a projector that performs projection using a plurality of light sources having different emission colors, a control program for the projector, and a light source control method.

  Conventionally, in a meeting or presentation, a projector that converts an image supplied from an image supply device such as a computer into projection light and projects it on a screen (or a whiteboard or the like) has been used. In this projector, for example, a color wheel (color filter) divided into R (red), G (green), and B (blue) regions in the rotation direction is rotated (hereinafter referred to as a color wheel system), and a light source lamp is provided there. Full color display is possible by generating light of each color of RGB by transmitting the light, and entering the generated light into a spatial light modulator such as a liquid crystal or a micromirror array. Therefore, in the above method, the time division width of each color of RGB accompanying the rotation of the color wheel is always the same.

  On the other hand, in the image to be projected, the RGB primary colors should not necessarily be displayed in an even color scheme. For example, a specific color such as an image that is preferably displayed with red (R) highlighted is used. An image that is preferably highlighted may be projected. At this time, in the color wheel system, the time division width of each color of RGB is always the same, so that a specific color cannot be emphasized.

Therefore, projectors that use LEDs of light emission colors of R, G, and B (hereinafter referred to as LED methods) as light sources (hereinafter referred to as LED methods) and variably control the time division width of each color of RGB in these LEDs have been proposed (for example, Patent Document 1). According to such a projector, it is possible to obtain a specific color emphasis effect by making the lighting time of the specific color LED longer than that of the other LEDs in accordance with the image to be projected.
JP 2007-94108 A

  As described above, there are a variety of images to be projected by the projector, and the RGB primary colors should not necessarily be displayed in a uniform color arrangement. Furthermore, not all RGB primary colors may be included. For example, descriptive images without entertainment elements, depending on titles and expressions in meetings and presentations are typical examples.

  However, in the conventional LED system, only the lighting time division width of each RGB LED is variably controlled. Therefore, all the RGB LEDs are always lit in one cycle, regardless of the lighting time of each RGB color. Therefore, even if the image to be projected does not include any of the primary colors RGB, the primary color LED that is not required when the image is projected is also lit.

  As a result, the LED of the primary color that is unnecessary during the projection of the image is lit, which not only adversely affects the projection result of the image, but also effectively uses the lighting time of the LED of the primary color that is unnecessary. It is also difficult to improve the projection quality.

  The present invention has been made in view of such conventional problems, and a projector capable of improving the projection quality of the image by effectively using the lighting time of an unnecessary light source at the time of projecting the image, and the projector It is an object to provide a control program and a light source control method.

In order to solve the above problems, the present invention provides a projector for projecting an image by lighting a plurality of light sources having different emission colors in a time-sharing manner, and color analyzing means for analyzing constituent colors of the projected image; The first determination means for determining whether or not there is a light emission color that is not used at the time of image projection among the light emission colors from the plurality of light sources based on the analysis result by the color analysis means, and the first determination means. Control means for allocating the time-division lighting time of the light emission color to the time-division lighting time of another light emission color when it is determined by the color analysis means that the light analysis color is not used. Based on the analyzed component colors of the image, the image processing apparatus includes a calculation unit that calculates an area ratio of each light emission color from the plurality of light sources in the image, and each light emission calculated by the calculation unit The basis of the area ratio, short larger emission color of area ratio, also as longer smaller emission colors area ratio, the unused emission color time-division lighting time of each of the other emission colors to be the use of It is characterized by assigning to time-division lighting time .
Further, the projector projects an image by turning on a plurality of light sources having different emission colors in a time-sharing manner, and analyzes the constituent colors of the projected image, based on the analysis result by the color analysis unit, First determination means for determining whether there is an emission color that is not used when projecting an image among the emission colors from the plurality of light sources, and the first determination means determines that there is an emission color that is not used. In this case, the control means for allocating the time-division lighting time of the light emission color to the time-division lighting time of the other light emission color, and adjusting the time-division lighting time to emphasize any one of the light emission colors from the light sources. The mode setting means for setting the mode, the emission color to be emphasized in the mode set by the mode setting means, and not used when projecting the image determined by the first determination means A second determination unit that determines whether or not the light color matches, and the control unit sets the set when the second determination unit determines that the two emission colors do not match A time-division lighting time of a light emission color that is not used at the time of projection is assigned to a time-division lighting time of the other light emission color at a ratio based on the mode.

  According to the present invention, the projection quality of the image such as luminance can be improved by effectively using the lighting time of a light source having an unnecessary light emission color when the image is projected.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a block diagram showing an electrical configuration of a projector 1 common to the embodiments of the present invention. The projector 1 includes a control unit 11, an input / output interface 12, an image conversion unit 13, a display encoder 14, a display drive unit 15, and the like. The image data is converted by the image conversion unit 13 so as to be unified into an image signal of a predetermined format suitable for display via the input / output interface 12 and the system bus 17 and then sent to the display encoder 14.

  The display encoder 14 develops and stores the transmitted image signal in the video RAM 18, generates a video signal from the stored contents of the video RAM 18, and outputs the video signal to the display driving unit 15.

  The display drive unit 15 to which a video signal is input from the display encoder 14 drives a DMD 19 (digital micromirror device) as a display element at every 256 gradations at an appropriate frame rate corresponding to the transmitted video signal. To do. The light beam emitted from the light source device 20 is incident on the DMD 19 via the light source side optical system, thereby forming an optical image with the reflected light of the DMD 19 and via the movable lens group 21 serving as the projection side optical system. The image is projected and displayed on a screen (not shown). The movable lens group 21 of the projection side optical system is driven by a lens motor 22 for zoom adjustment and focus adjustment.

  The image compression / decompression unit 23 performs recording processing for compressing the luminance signal and the color difference signal in the image signal by processing such as ADTC and Huffman coding, and writing the data onto a memory card 24 that is a detachable recording medium. The image data recorded in the memory card 24 is read out, and individual image data constituting a series of moving images is decompressed in units of one frame and sent to the display encoder 14 via the image conversion unit 13 to be stored in the image data stored in the memory card 24. Based on this, it is possible to display a moving image or the like.

  The control unit 11 controls the operation of each circuit in the projector 1, and includes a CPU and its peripheral circuits, a ROM 111, a RAM 112, and the like. The ROM 111 stores programs such as various settings, programs and data shown by flowcharts described later, and the RAM 112 is used as a work memory or the like.

  The key / indicator unit 25 includes a main key and an indicator provided in the main body case and the like, and an operation signal thereof is sent to the control unit 11. The key operation signal from the remote controller is received by the Ir receiver 26, demodulated by the Ir processor 27, and the code signal is sent to the controller 11.

  In addition, an audio processing unit 30 is connected to the control unit 11 via a system bus 17, and the audio processing unit 30 includes a sound source circuit such as a PCM sound source, and converts audio data into analog data in the projection mode and the playback mode. The loudspeaker 31 can be driven to emit loud sounds.

  The light source device 20 includes a red LED 20R that emits an R (red) color, a green LED 20G that emits a G (green) color, a blue LED 20B that emits a B (blue) color, and a white LED 20W that emits a W (white) color. It consists of The control unit 11 controls the light source control circuit 32 to time-division-control each LED 20R, 20G, 20B, 20W according to the image signal.

  In the present specification, the LEDs 20R, 20G, 20B, and 20W constituting the light source device 20 are generated by time-division control, and the R (red) color, G (green) color, B (blue) color, W The (white) color shall be called the primary color.

  In the present embodiment having the above configuration, the control unit 11 of the projector 1 executes processing according to the flowchart shown in FIG. 2 based on the program stored in the ROM 111. That is, image data supplied to the input / output connector unit 16 at a frame rate according to the standard of the image data supplied from a personal computer or the like, or image data supplied from the memory card 24 at a frame rate according to the standard. Read (step SA1).

  Next, the constituent colors of the read image data are analyzed (step SA2). When analyzing the constituent colors, the constituent colors of the image data are separated into the primary colors R, G, B, and W, and for example, the content percentage of these primary colors R, G, B, and W is calculated. Thereafter, it is determined whether or not there is a primary color that is not used among the primary colors R, G, B, and W in the image data, in other words, whether or not there is a primary color that is not used when projecting the image data. (Step SA3).

  When there are no primary colors that are not used and all primary colors are used (step SA3 → NO), each segment width for lighting each color LED is adjusted to a normal segment width in one cycle for creating a projection image (step SA5). . That is, the ROM 111 stores all the LEDs 20R, 20G, 20B, and 20W, and stores the normal segment width that is the lighting time of each LED when these are time-division controlled. Therefore, when image projection is performed using all of the LEDs 20R, 20G, 20B, and 20W, the normal segment width is read from the ROM 111 and stored in the work area of the RAM 112 by the processing in step SA5.

  Subsequently, image projection is performed while driving the four LEDs 20R, 20G, 20B, and 20W in the light source device 20 with the normal segment width temporarily stored in the RAM 112 (step SA6). That is, the display driving unit 15 drives the display element 19 in response to the transmitted image signal, and the light beam emitted from the light source device 20 enters the display element 19 via the light source side optical system. Then, an optical image is formed by the reflected light of the display element 19, and a slide image is projected onto a screen (not shown) via the lens group 21.

  Therefore, when there is no primary color that is not used, image projection is performed while using all of the LEDs 20R, 20G, 20B, and 20W and lighting all these LEDs in a time-division manner with a normal segment width.

  On the other hand, if the determination in step SA3 is YES, that is, if there is an unused primary color among the primary colors R, G, B, and W during projection in the image data, the segment width of the unused primary color is used. The segment widths of the primary colors to be assigned are allotted to a uniform extension, and the lighting pattern of each LED in the light source device 20 is adjusted (step SA4). Therefore, if the segment widths of the respective LEDs 20R, 20G, 20B, and 20W during normal lighting are uniformly 1/4 each, for example, when there is one primary color that is not used and there are three primary colors that are used The segment width, which is the lighting time of each LED when performing time-division control of these three color LEDs, is stored in the work area of the RAM 112 as equal to 1/3.

  Or, the normal segment width is not uniform for each LED 20R, 20G, 20B, 20W, and may be different. In this case, for example, when there is one primary color that is not used, and there are three primary colors that are used, the segment width of the primary color that is not used (one color) is reduced to 1/3 and the primary color that is used (3 The color is added to the segment width and stored in the work area of the RAM 112.

  Subsequently, with the uniform segment width temporarily stored in the RAM 112, the LEDs 20R, 20G, 20B, and 20W of the light source device 20 are sequentially driven to drive only the primary color LEDs that are not used, except for the primary color LEDs that are not used. Image projection is executed in the same manner as described above (step SA6). Therefore, when there is one unused primary color, for example, one of the LEDs 20R, 20G, 20B, and 20W is excluded, and the remaining three LEDs are lighted in a time-sharing manner with the same segment width, and image projection is performed. Will be done.

  Therefore, first, LEDs of primary colors that are not included in the image and are unnecessary when the image is projected are kept off without being turned on. As a result, it is possible to prevent the occurrence of a phenomenon that adversely affects the projection result of the image due to the lighting of the primary color LED that is unnecessary during the projection of the image. Projection quality can be improved.

  Second, the lighting time (segment width) of the primary color LEDs that are not used for the current image projection can be effectively used for the lighting times of the remaining three LEDs that are used for the current image projection. Thereby, in a meeting, a presentation, etc., it becomes possible to highlight the specific color contained in the projected image, increase the luminance of the entire image, and the like.

  As a result, the projection quality of the image is improved by turning off the unnecessary primary color LED during the projection of the image and extending the lighting time of the other necessary primary color LEDs by effectively using the lighting time of the unnecessary primary color LED. be able to.

(Second Embodiment)
FIG. 3 is a flowchart showing a processing procedure in the second embodiment of the present invention. In this flowchart, the processes of steps SB1 to SB3, SB5, and SB6 except for step SB4 are the same as the processes of steps SA1 to SA3, SA5, and SA6 except for the aforementioned step SA4 shown in FIG. In step SB4 corresponding to the only different step SA4, if there is a primary color that is not used in the image data to be projected, the segment width of each primary color that uses the segment width of the primary color that is not used is based on the image constituent color. Adjust the expansion ratio of the segment width of each primary color to be allocated and used.

  That is, as illustrated in FIG. 4A, green (G) is not included, only three primary colors, white (W), red (R), and blue (B) are included, and red on a white background. If the image P is dotted with blue patterns and characters, the determination at step SB3 is YES, and the process at step SB4 is executed.

Steps SB41 to SB43 shown in FIG. 4B are flowcharts showing details of the processing procedure of step SB4. First, in the image based on the image data to be projected, the area ratio of the image constituent primary colors which are the image constituent colors of the primary colors is calculated (step SB41). At this time, if the image based on the image data to be projected is the image P shown in FIG.
White (W) = 60%
Red (R) = 30%
Blue (B) = 10%
Will be calculated.

Next, the inverse ratio of the area ratio calculated in step SB41 is calculated (step SB42). As a result of the process in step SB42, as the inverse ratio of the area ratio,
White (W) = 10%
Red (R) = 30%
Blue (B) = 60%
Is calculated.

Further, the segment width of each primary color to be used is adjusted to the reverse ratio (step SA43). In other words, the white (W) segment width obtained in step S42 by the processing in step S43 = 10%.
Red (R) segment width = 30%
Blue (B) segment width = 60%
Is stored in the work area of the RAM 112.

In step SB6 following step SB4 in the flowchart of FIG. 3, image projection is executed while driving the three LEDs 20R, 20B, and 20W in the light source device 20 with the segment width temporarily stored in the RAM 112 (step SB6). ). Therefore, the segment width is
White (W) = 10%
Red (R) = 30%
Blue (B) = 60%
The area ratio white (W) = 60% of the image constituent primary colors
Red (R) = 30%
Blue (B) = 10%
The opposite is true.

  That is, in the image P, the largest area ratio “white (W) = 60%” can be assumed to be the background color as illustrated in FIG. Further, it can be assumed that the smaller area ratios of “red (R) = 30%” and “blue (B) = 10%” are characteristic portions in the image P other than the background. Therefore, since the background portion is a non-important portion in the projection image, the necessity for color enhancement is low. On the other hand, the feature portion in the image P is an important portion in the projection image. It is preferable as a form.

Therefore, in the present embodiment, in the above-described step SB42 and step SB43, the primary LED lighting segment width to be used is increased by the inverse ratio to the area ratio by the primary LED lighting segment width that is not used in the projection image. The ratio was adjusted. In this way, a negative color emphasis can be achieved for an unimportant background that has a large area ratio in the projected image. On the other hand, with respect to an important feature portion having a small area ratio in the projection image, the segment width to be added can be increased by the inverse ratio, and positive color enhancement can be performed. Thereby, clear display over the details of the projected image becomes possible.

(Third embodiment)
FIG. 5 is a flowchart showing a processing procedure in the third embodiment of the present invention. That is, image data supplied to the input / output connector unit 16 at a frame rate according to the standard of the image data supplied from a personal computer or the like, or image data supplied from the memory card 24 at a frame rate according to the standard. Read (step SC1).

Next, it is determined whether or not there is a mode setting (step SC2). Here, the mode set by the mode setting is
A first mode for emphasizing the R (red) color,
-A second mode for emphasizing the G (green) color,
-A third mode for emphasizing B (blue) color,
A fourth mode for emphasizing the W (white) color,
And a combination mode combining these modes.

  If none of these modes is set, the normal segment width is adjusted (step SC6) as described in the flowchart of FIG. That is, the ROM 111 stores all the LEDs 20R, 20G, 20B, and 20W, and stores the normal segment width that is the lighting time of each LED when these are time-division controlled. Therefore, when image projection is performed using all of the LEDs 20R, 20G, 20B, and 20W, the normal segment width is read from the ROM 111 and stored in the work area of the RAM 112 by the processing in step SC6. Subsequently, the image projection is executed in the same manner as described above while sequentially turning on the LEDs 20R, 20G, 20B, and 20W, which are all LEDs of the light source device 20, with the normal segment width temporarily stored in the RAM 112 (step SC6).

  If the result of determination in step SC2 is mode setting, the constituent colors of the image data read in step SC1 are analyzed (step SC3). When analyzing the constituent colors, the constituent colors of the image data are separated into the primary colors R, G, B, and W, for example, and the content percentage of these primary colors R, G, B, and W is calculated, for example. Thereafter, it is determined whether or not there is a primary color that is not used among the primary colors R, G, B, and W in the image data, in other words, whether or not there is a primary color that is not used when projecting the image data. (Step SC4).

  If there are no unused primary colors and all primary colors are used (step SC4 → NO), the normal segment width is adjusted at step SC6 and the image is projected at step SC8 as described above.

  However, if the determination in step SC4 is YES, that is, if there is a primary color that is not used among the primary colors R, G, B, and W in the image data, and therefore there is a primary color that is not used when projecting the image data. In step SC5, it is determined whether the unused primary color is a primary color set to be adjusted in the mode determined to have mode setting in step SC2.

That means
Since the first mode is a mode for emphasizing the R (red) color, if the unused primary color is the R (red) color, the “unused primary color is the primary color set to be adjusted in the mode” ( Step SC5 → YES).
Since the second mode is a mode for emphasizing and adjusting the G (green) color, if the unused primary color is the G (green) color, the “unused primary color is a primary color set to be adjusted in the mode” ( Step SC5 → YES).
Since the third mode is a mode for emphasizing the B (blue) color, if the unused primary color is the B (blue) color, the “unused primary color is the primary color set to be adjusted in the mode” ( Step SC5 → YES).
Since the fourth mode is a mode for emphasizing and adjusting the W (white) color, if the unused primary color is the W (white) color, the “unused primary color is a primary color set to be adjusted in the mode” ( Step SC5 → YES).

  Thus, when “unused primary color” = “primary color set to be adjusted in the mode”, since the primary color is not used in the first place, the primary color segment is expanded and adjusted (step SC7). Is meaningless, and it is unnecessary to execute the process of step SC7. Therefore, in this case, the process proceeds to step SS9 without performing the process of step SC7. In step SC9, the segment widths of the primary colors to be used are evenly adjusted, and the speaker 31 is driven to generate an alarm sound (mute volume that can be heard only by the operator and the explainer) (SC10). move on.

  Therefore, even if “unused primary color” = “primary color set to be adjusted in the mode”, the segment width is uniform and the specific primary color is not emphasized. Can do. Further, the alarm sound can inform the operator or the explainer that a contradiction has occurred that “primary color not to be used” = “primary color set to be adjusted in the mode”.

If the determination in step SC5 is NO and the unused primary color is not the primary color set to be adjusted in the mode determined to have mode setting in step SC2, that is,
“Unused primary color” ≠ “Primary color set to be adjusted in mode”
If so, the image projection process (step SC8) is executed after the process of step SC7 is executed.

That is, in step SC7, the segment width of the primary color used is increased and adjusted at a rate according to the mode. Here, regarding the “ratio according to the mode”, the above-described first mode for emphasizing and adjusting the R (red) color,
-A second mode for emphasizing the G (green) color,
-A third mode for emphasizing B (blue) color,
A fourth mode for emphasizing the W (white) color,
In each of the modes, the segment width for the emphasis adjustment in step SC7 is determined in advance for each of the first to fourth modes and stored in the ROM 111. For example, if the primary mode of G is not used in the projection image in the state in which the first mode is set to emphasize red twice as much as the other primary colors, the other R, B, When the LED segment width of the W LED is increased, the LED segment width is increased at a rate that the increase of the R segment width is twice the increase of the B and W segment widths. Therefore, according to the first to fourth modes, the segment width of the primary color to be emphasized can be preferentially widened using the segment width of the unused primary color.

  Therefore, first, the primary color LEDs that are not included in the image and are unnecessary when the image is projected are maintained in the off state. As a result, it is possible to prevent the occurrence of a phenomenon that adversely affects the projection result of the image due to the lighting of the primary color LED that is unnecessary during the projection of the image. Projection quality can be improved.

  Secondly, the lighting time of the primary color LED that is not used for the current image projection can be effectively used for the lighting time of the LED that should be emphasized according to the mode. Thereby, in a meeting, a presentation, etc., it becomes possible to highlight the specific color contained in the projected image, increase the luminance of the entire image, and the like.

As a result, the projection quality of the image is improved by turning off the unnecessary primary color LED during the projection of the image and extending the lighting time of the other necessary primary color LEDs by effectively using the lighting time of the unnecessary primary color LED. be able to.
In the third embodiment described above, when a user selects and sets a color that the user wants to emphasize in advance, the primary LED lighting period that is not used in the projected image is allocated to the extension of another primary LED lighting period. The primary LED lighting period set by the user is preferentially added. However, the present invention is not limited to this, and conversely, by selecting and setting in advance a color that the user does not want to emphasize, The period may be added passively or not. With such a configuration, for example, materials projected in a presentation or the like are often a series of materials in which the background is unified with one color, so the background color is set to a color that you do not want to emphasize in advance. In this way, high brightness and color projection can be realized in a portion other than the background to be emphasized.

  In the embodiment, the case where R, G, B, and W are used as the four primary colors is shown. However, the number of primary colors is not limited to “4”, and colors such as cyan and magenta are also used. It may be used as a primary color.

  In the above-described embodiment, since LEDs having different emission colors are used as light sources, the cost and power saving are excellent, but a plurality of light sources having different emission colors other than LEDs, such as laser light sources, are used. You may make it use.

1 is a block diagram showing a circuit configuration of a projector according to an embodiment of the present invention. It is a flowchart which shows the process sequence in the 1st Embodiment of this invention. It is a flowchart which shows the process sequence in the 2nd Embodiment of this invention. (A) is explanatory drawing which shows operation | movement of step SB4 in the flowchart of FIG. 3, (B) is a flowchart which shows the detail of the step SB4. It is a flowchart which shows the process sequence in the 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Projector 11 Control part 12 Input / output interface 13 Image conversion part 14 Display encoder 15 Display drive part 16 Input / output connector part 17 System bus 18 Video RAM
19 Display element 19 DMD
20 Light source device 20B Blue LED
20G green LED
20R Red LED
20W white LED
DESCRIPTION OF SYMBOLS 21 Movable lens group 22 Lens motor 23 Image compression / decompression part 24 Memory card 25 Key / indicator part 30 Sound processing part 31 Speaker 32 Light source control circuit 111 ROM
112 RAM
P image

Claims (11)

A projector that projects an image by lighting a plurality of light sources having different emission colors in a time-sharing manner,
Color analysis means for analyzing constituent colors of the projected image;
First determination means for determining whether or not there is a light emission color that is not used when projecting an image among the light emission colors from the plurality of light sources based on the analysis result by the color analysis means;
Control means for allocating the time-division lighting time of the emission color to the time-division lighting times of other emission colors when it is determined by the first determination means that there is an unused emission color;
The control means includes
Based on the constituent colors of the image analyzed by the color analysis means, the calculation means for calculating the area ratio used for each emission color from the plurality of light sources in the image,
Based on the area ratio of each light emission color calculated by the calculating means, the light emission color having a larger area ratio is shorter, and the light emission color having a smaller area ratio is longer, and the time-division lighting time of the light emission color that is not used is longer. Is assigned to the time-division lighting time of each of the other emission colors used . The control means creates an inverse ratio in which the largest area ratio and the smallest area ratio are interchanged among the area ratios of the respective emission colors calculated by the calculation means, and the light emission that is not used at the ratio of the inverse ratio. 2. The projector according to claim 1 , wherein a time-division lighting time of a color is assigned to a time-division lighting time of each of the other light emission colors used . A projector that projects an image by lighting a plurality of light sources having different emission colors in a time-sharing manner,
Color analysis means for analyzing constituent colors of the projected image;
First determination means for determining whether or not there is a light emission color that is not used when projecting an image among the light emission colors from the plurality of light sources based on the analysis result by the color analysis means;
Control means for assigning the time-division lighting time of the emission color to the time-division lighting times of other emission colors when it is determined by the first determination means that there is an unused emission color;
Mode setting means for setting a mode for emphasizing any of the emission colors from each of the light sources by adjusting the time-division lighting time;
Second determination for determining whether or not the light emission color to be emphasized in the mode set by the mode setting means matches the light emission color that is not used at the time of projection of the image determined by the first determination means. Means and
The control means includes
When the second determination means determines that the two emission colors do not match, the time-division lighting time of the emission colors not used at the time of projection is set to the ratio of the other emission colors at a ratio based on the set mode. A projector characterized by being assigned to a time-division lighting time. The control means includes
When the second determination means determines that the two emission colors match, the time-division lighting time of the unused emission color is changed to the time-division lighting time of the other emission colors with an equal time-division width. 4. The projector according to claim 3, wherein each projector is assigned. When it is determined by the first determination means that there is no emission color that is not used,
5. The projector according to claim 1, wherein the control unit assigns a normal time-division lighting time stored in advance to each light source. 6. The projector according to claim 1, wherein the plurality of light sources having different emission colors emit red, green, blue, and white, respectively. The projector according to claim 1, wherein the plurality of light sources having different emission colors are LEDs. A computer having a projector for projecting an image by lighting a plurality of light sources having different emission colors in a time-sharing manner,
Color analysis means for analyzing constituent colors of the projected image;
Based on the analysis result by the color analysis unit, a determination unit that determines whether there is an emission color that is not used when projecting an image among the emission colors from the plurality of light sources;
Control means for allocating the time-division lighting time of the emission color to the time-division lighting times of other emission colors when it is determined by the determination means that the emission color is not used;
To function,
The control means includes
Based on the constituent colors of the image analyzed by the color analysis means, the calculation means for calculating the area ratio used for each emission color from the plurality of light sources in the image,
Based on the area ratio of each light emission color calculated by the calculating means, the light emission color having a larger area ratio is shorter, and the light emission color having a smaller area ratio is longer, and the time-division lighting time of the light emission color that is not used is longer. Is assigned to the time-division lighting time of each of the other emission colors used. A computer having a projector for projecting an image by lighting a plurality of light sources having different emission colors in a time-sharing manner,
Color analysis means for analyzing constituent colors of the projected image;
First determination means for determining whether or not there is a light emission color that is not used when projecting an image among the light emission colors from the plurality of light sources based on the analysis result by the color analysis means;
When it is determined by the determining means that there is an unused emission color, the control means for assigning the time-division lighting time of the emission color to the time-division lighting time of other emission colors;
Mode setting means for setting a mode for emphasizing any of the emission colors from each of the light sources by adjusting the time-division lighting time;
Second determination for determining whether or not the light emission color to be emphasized in the mode set by the mode setting means matches the light emission color that is not used at the time of projection of the image determined by the first determination means. Function as a means,
The control means includes
When the second determination means determines that the two emission colors do not match, the time-division lighting time of the emission colors not used at the time of projection is set to the ratio of the other emission colors at a ratio based on the set mode. A projector control program that is assigned to a time-division lighting time. A light source control method in a projector for projecting an image by lighting a plurality of light sources having different emission colors in a time-sharing manner,
A color analysis step of analyzing the constituent colors of the projected image;
A determination step of determining whether there is an emission color that is not used when projecting an image among the emission colors from the plurality of light sources based on the analysis result of the color analysis step;
A control step of assigning a time-division lighting time of the emission color to a time-division lighting time of another emission color when it is determined by the determination step that the emission color is not used;
Including
The control step includes
Based on the constituent colors of the image analyzed by the color analysis step, a calculation step of calculating an area ratio of each emission color from the plurality of light sources in the image;
Based on the area ratio of each emission color calculated in this calculation step, the time-division lighting time of the unused emission color is shorter so that the emission color with a larger area ratio is shorter and the emission color with a smaller area ratio is longer. A light source control method comprising: adjusting a time division lighting time for each of the other light emission colors used. A light source control method in a projector for projecting an image by lighting a plurality of light sources having different emission colors in a time-sharing manner,
A color analysis step of analyzing the constituent colors of the projected image;
A first determination step of determining whether there is an emission color that is not used when projecting an image among the emission colors from the plurality of light sources based on the analysis result of the color analysis step;
When it is determined that there is an unused emission color by this determination step, a control step of assigning the time-division lighting time of the emission color to the time-division lighting time of other emission colors;
A mode setting step for setting a mode for emphasizing any of the emission colors from each of the light sources by adjusting the time-division lighting time;
Second determination for determining whether or not the light emission color to be emphasized in the mode set in the mode setting step matches the light emission color not used in projecting the image determined in the first determination step. Including processes
The control step includes
If it is determined by the second determination step that the two emission colors do not match, the time-division lighting time of the emission color not used at the time of projection is set to the ratio of the other emission colors at a ratio based on the set mode. A light source control method characterized by allocating to a time-division lighting time.

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