JP2010217220A - Projector, image projection control program, and image projection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector, or the like, in which full smoothness is obtained in animation display by effectively utilizing the successive display function of an image. <P>SOLUTION: This method includes a step S4 for generating interpolation frame, corresponding to output time difference of color components, on the basis of a pre-frame image and a post-frame image, when a projected image is an animation. Next, the method includes a step 5 for performing R color projection, by extracting R components of the pre-frame, that is, the R color is projected from a color wheel, and the R component of the pre-frame images is extracted; micro-mirror element is displayed/driven by a projection image processing part 1; and the R-component image in the pre-frame image is projected on a screen through a projection lens by the reflected light. Furthermore, the method includes steps S5 to 10 for extracting color components and performing projection, with the corresponding light-emitting color for first to fifth interpolated images generated in the step 4, in the same way. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a projector, an image projection control program, and an image projection method.

  2. Description of the Related Art Conventionally, in a projector, a color wheel is rotated to switch R (red), G (green), and B (blue) in a time-sharing manner, and incident on a DMD that is a light modulation element to perform color sequential display (for example, the following) Patent Document 1). At this time, for example, as shown in FIG. 4A, the color wheel is rotated twice for each frame, and “RGBRGB” and RGB color sequential display are repeated twice, so that frames 1, 2, 3,. Switch images at a frame rate of 60 [frames / second] and project an image.

JP 2004-317814 A

  However, in the conventional projector, the image of the frame displayed in the color sequential display “RGBRGB” in the frame is the same. That is, as shown in FIG. 5, when projecting frames 1, 2, 3,... Constituting a moving image, for example, when projecting an image of frame 2, RGB colors in the image of the same frame 2 are projected. Repeat the display twice. Accordingly, the images (b) to (g) used in each color sequential display “RGBRGB” are all the same image.

  For this reason, although the sequential display of images is performed in a time division manner, the sequential display function of the images is not effectively used, and the same image is projected multiple times, which is sufficient for displaying moving images. The reality was that smoothness was not obtained.

  The present invention has been made in view of such conventional problems, and provides a projector, an image projection control program, and an image projection method capable of obtaining sufficient smoothness for moving image display by effectively utilizing the sequential display function of images. It is intended to do.

  In order to solve the above-described problem, the projector according to the first aspect of the present invention is a projector that sequentially captures frame images, and projects the captured images in a time-division manner using different emission colors in units of frames. And an interpolation image generating means for generating an interpolated frame image that sequentially changes in accordance with the time difference of the time-division projection based on temporally adjacent front and rear frame images captured by the capturing means. And a projecting means for performing time-division projection with the different emission colors by interpolating the interpolated frame image generated by the interpolated image generating means between the preceding and succeeding frame images captured by the capturing means. To do.

  In the projector according to a second aspect of the present invention, the interpolation image generation means generates a number of interpolation frame images corresponding to the number of time divisions.

  In the projector according to the third aspect of the present invention, the projector includes storage means for sequentially storing the temporally adjacent frame images captured by the capture means, and the interpolation image generation means is the storage An interpolated frame image is generated based on the preceding and following frame images stored in the means.

  In the projector according to the fourth aspect of the present invention, the image projected by the projection unit is a moving image or a still image based on temporally adjacent front and rear frame images captured by the capture unit. Determining means for determining whether the image is a moving image by the determining means, and a control means for operating the interpolated image generating means when the moving image is determined by the determining means. When it is determined that there is a frame image, the frame image captured by the capturing unit is projected in a time-sharing manner using the different emission colors.

  According to a fifth aspect of the present invention, the projector includes storage means for sequentially storing the temporally adjacent frame images captured by the capture means, and the determination means is stored in the storage means. Whether the image projected by the projection means is a moving image or a still image is determined based on the stored front and back frame images.

  In the image projection control program according to the sixth aspect of the present invention, the frame image includes: a computer included in a projector that sequentially captures frame images and projects the captured images in a time-division manner using different emission colors in units of frames. And an interpolation image generating means for generating an interpolated frame image that sequentially changes in accordance with the time difference of the time-division projection based on temporally adjacent front and rear frame images captured by the capturing means. The interpolated frame image generated by the interpolated image generating means is interposed between the previous and next frame images captured by the capturing means, and the function is used as a projecting means for time-division projection using the different emission colors. And

  The image projecting method according to claim 7 is an image projecting method for sequentially capturing frame images, and performing time-division projection of the captured images with different emission colors in units of frames. An image capturing step that sequentially captures images, and an interpolated image generating step that generates interpolated frame images that sequentially change according to the time difference of the time-division projection based on temporally adjacent front and rear frame images captured by the capturing step. And a projecting step of performing time-division projection with the different emission colors by interpolating the interpolated frame image generated by the interpolated image generating step between the preceding and succeeding frame images captured by the capturing step. And

  According to the present invention, the sequential display function of images can be effectively used to obtain sufficient smoothness for moving image display, and the moving image display function in the projector can be enhanced in the smoothness of moving images.

1 is a block configuration diagram of a projector according to an embodiment of the invention. FIG. It is a flowchart which shows the process sequence of the projector. It is a figure which shows the example of a production | generation of the interpolation frame image in this Embodiment. (A) is explanatory drawing which shows the color sequential display in a prior art, (a) is explanatory drawing which shows the color sequential display in this Embodiment. It is explanatory drawing which shows the image in the color sequential display in a prior art.

  Hereinafter, embodiments of the present invention will be described. As shown in FIG. 1, the projector 10 according to the present embodiment has an external device such as a PC connected via an input / output connector unit 11, and image signals of various standards input from the input / output connector unit 11 are Are temporarily stored in the buffer 14 via the input / output interface (I / F) 12 and the system bus 13. The buffer 14 includes a first buffer 141 and a second buffer 142. The first buffer 141 stores a previous frame of consecutive frames, and the second buffer 142 stores a subsequent frame. .

  Then, the preceding and following frames and the interpolation frame generated by the processing to be described later are unified into an image signal of a predetermined format by the image conversion unit 15 and then sent to the projection image processing unit 16. The projection image processing unit 16 generates a video signal from the transmitted image signal, and multiplies an appropriate frame rate, for example, 60 [frames / second], the number of color component divisions, and the number of display gradations, to obtain a higher speed. For example, the micromirror element 17 which is a spatial light modulation element (SOM) is driven to display by time division driving.

  Note that the projector 10 according to the present embodiment repeats RGB color sequential display twice as in the prior art described above, and therefore the number of color component divisions is “6” per frame.

  An LED as a light source lamp 19 is connected to the system bus 13 via a projection light processing unit 18. The light source lamp 19 is covered with a reflector 20 on the rear side. A color wheel 21, an integrator 22, and a mirror 23 are disposed between the light source lamp 19 and the above-described micromirror element 17, and light emitted from the light source lamp 19 is appropriately primary color via the color wheel 21. By irradiating the micromirror element 17 through the integrator 22 and the mirror 23, an optical image is formed by the reflected light and projected onto a screen (not shown) via the projection lens 24. ing.

  Both the lighting drive of the light source lamp 19 and the motor 25 that rotationally drives the color wheel 21 are operated based on the supply voltage value from the projection light processing unit 18. The color wheel 21 has a predetermined rotational position detected by a marker sensor 26 disposed close to the peripheral end surface thereof, and the detection signal is input to the projection image processing unit 16.

  Note that the color wheel 21 in the present embodiment is arranged in such a manner that each color filter called a segment of R (red), G (green), and B (blue) is divided and arranged on the outermost periphery. A marker including an arc-shaped through hole is formed at a predetermined rotational position of the rim portion.

  The marker sensor 26 is composed of, for example, a reflection type photo interrupter, and is arranged close to the rim portion of the color wheel 21. In the marker sensor 26, the light emitted from the LED constituting the photo interrupter is not reflected by the rim portion only at the marker portion, and the level of the output signal of the light receiving element is lowered. The start position of the (red) segment can be detected.

  The control unit 27 is a central processing unit that controls all the operations of each circuit, and includes a CPU and its peripheral circuits. The storage unit 28 stores a program or the like for the control unit 27 to execute processing shown in a flowchart described later.

  An image recording unit 29 is connected to the control unit 27 via the system bus 13. The image conversion unit 15 compresses the luminance and color difference signals by a process such as ADCT and Huffman coding, and writes the obtained image data into an image recording unit 29 that is mounted as a recording medium of the projector 10. ing. The image recording unit 29 is composed of, for example, a flash memory or the like, and stores data obtained by photographing.

  The sound processing unit 30 includes a sound source circuit such as a PCM sound source, converts the sound data given at the time of the projection operation into an analog signal, drives the speaker 31 to emit a loud sound, or generates a beep sound if necessary.

  The key switch unit 32 includes various switches such as on / off of the power supply of the apparatus, a projection start switch, and a mode change switch, and outputs each key operation signal to the control unit 27. The remote control signal receiving unit 33 receives a remote control signal, converts the received remote control signal into a code signal, and sends it to the control unit 27.

  The radio control unit 34 has a function of transmitting and receiving a radio signal of a predetermined frequency, supplying a reception signal to the control unit 27 via the system bus 13, and transmitting a transmission signal generated by the control unit 27 to the outside. Have.

  Next, the operation of projector 10 according to the present embodiment will be described with reference to the flowchart shown in FIG. When the projection start switch is operated with the power turned on, the control unit 27 executes processing according to a program stored in the storage unit 28. That is, capturing of a frame image is started from an external device such as a PC connected to the input / output connector unit 11 via the input / output interface 12 (step S1). Then, the previous frame image, which is the earliest frame image that has not yet been projected in the captured frame image, is stored in the first buffer 141, and after the next frame that is temporally adjacent to the previous frame image The frame is stored in the second buffer 142 (step S2).

  Next, based on the previous frame image and the rear frame image stored in both the buffers 141 and 142, it is determined whether the image to be projected is a moving image or a still image (step S3). That is, comparing the previous frame image and the rear frame image, if there is a difference between them, it can be determined that the image to be projected is a moving image, and if there is no difference, it is determined that the image to be projected is a still image. be able to. If it is determined in step S3 that the image is a moving image, an interpolation frame corresponding to the output time difference between the color components is generated based on the previous frame image and the subsequent frame image (step S4).

  That is, the projector 10 according to the present embodiment repeats RGB color sequential display twice at a frame rate of 60 [frames / second] as described above, and therefore, the number of divisions of color components is per frame. “6”. Further, since the previous frame image itself is used for the first color sequential display among the division number “6”, the number of interpolation frame images to be generated is 6-1 = 5. Therefore, as shown in FIG. 3, if the previous frame image 1 is the image shown in FIG. 3A and the rear frame image 2 is the image shown in FIG. “5 sheets” of 1 to 1-5 are generated.

  Further, since the frame rate is 60 [frames / second] and the division number is “6”, the output time difference of the color components is 1/60/6 = 1/360 [seconds]. Therefore, the front frame image 1 is an image immediately after the person throws the ball as shown in FIG. 5A, and the rear frame image 2 is a single ball from the person as shown in FIG. Assuming that the images are separated by height, interpolated images (b) to (f) that change at a timing of 1/360 [seconds] are generated between images that change from image (a) to image (g).

  Then, the generated interpolation images (b) to (f) are converted into the first interpolation frame image 1-1, the second interpolation frame image 1-2, the third interpolation frame image 1-3, and the fourth interpolation frame image 1-. 4 and the fifth interpolation frame image 1-5.

  Next, the R component of the previous frame is extracted and R color projection is performed (step S5). That is, the R color is projected from the color wheel 21, the R component of the previous frame image 1 is extracted, the micromirror element 17 is displayed and driven by the projection image processing unit 16, and the reflected light passes through the projection lens 24. The R component image in the previous frame image 1 is projected on the screen.

  Further, the G component of the first interpolation frame is extracted and G color projection is performed (step S6). That is, the G color is projected from the color wheel 21, the G component of the first interpolation frame image 1-1 is extracted, the micromirror element 17 is displayed and driven by the projection image processing unit 16, and the reflected light is projected. The G component image in the first interpolation frame image 1-1 is projected onto the screen via the lens 24.

  Further, the B component of the second interpolation frame is extracted and B color projection is performed (step S7). That is, the B color is projected from the color wheel 21, the B component of the second interpolation frame image 1-2 is extracted, the micromirror element 17 is driven by the projection image processing unit 16, and the reflected light is projected. The B component image in the second interpolation frame image 1-2 is projected onto the screen via the lens 24.

  Therefore, the first RGB color sequential display is completed by the processing in steps S5 to S7.

  Subsequently, the R component of the third interpolation frame is extracted and R color projection is performed (step S8). That is, the R color is projected from the color wheel 21, the R component of the third interpolation frame image 1-3 is extracted, the micromirror element 17 is displayed and driven by the projection image processing unit 16, and the reflected light is projected. The R component image in the third interpolation frame image 1-3 is projected onto the screen via the lens 24.

  Further, the G component of the fourth interpolation frame is extracted and G color projection is performed (step S9). That is, the G color is projected from the color wheel 21, the G component of the fourth interpolation frame image 1-4 is extracted, the micromirror element 17 is driven to display by the projection image processing unit 16, and the reflected light is projected. The G component image in the fourth interpolation frame image 1-4 is projected onto the screen via the lens 24.

  Further, the B component of the fifth interpolation frame is extracted and B color is projected (step S10). That is, B color is projected from the color wheel 21, B component of the fifth interpolation frame image 1-5 is extracted, the micromirror element 17 is driven to display by the projection image processing unit 16, and projected by the reflected light The B component image in the fifth interpolation frame image 1-5 is projected onto the screen via the lens 24.

  Therefore, as shown in FIG. 4B, the color components of the previous frame image 1 and the interpolated frame images 1-1 to 1-5 are projected at the RGB and RGB timings by the processing in the above steps S5 to S10. Is done. In the projected interpolated frame images 1-1 to 1-5, as described above with reference to FIGS. 3B to 3F, the color between the previous frame image 1 and the rear frame image 2 is as described above. It is the image changed according to the output time difference of a component.

  Therefore, the moving image displayed on the screen can be made smoother than the conventional case shown in FIG. Therefore, the image sequential display function can be effectively used to obtain a sufficiently smooth moving image display, and the moving image display function in the projector can be enhanced in the smoothness of the moving image.

  Moreover, in the present embodiment, since five interpolated frame images 1-1 to 1-5 are generated according to the number of time divisions, the projected moving image can be made smoother. it can.

  In step S11 subsequent to step S10, it is determined whether or not a projection end instruction is detected, and the processing from step S2 is repeated until an end instruction is detected.

  At this time, if it is determined in step S3 that the image to be projected is a still image based on the previous frame image and the rear frame image stored in both the buffers 141 and 142, normal projection processing is executed (step S12). ), The process proceeds to step S11. Here, the normal projection process is a projection process similar to the conventional one shown in FIG. 4A, and is a process of repeating RGB color sequential display twice per frame using only the frame image.

  Therefore, when the image to be projected is a still image, the process of generating an interpolation frame image or the like is not executed as in the case of the moving image described above, and thus unnecessary processing can be avoided in advance. .

  In the present embodiment, the RGB color sequential display per frame is shown to be repeated twice. However, the color sequential display per frame is not limited to this, and may be performed once or more times. Also, an appropriate value can be used for the frame rate, and the color displayed in the color sequential display is not limited to RGB, and W (white) or Y (yellow) may be added.

  Furthermore, in the present embodiment, the present invention is applied to a projector that performs color sequential display using a color wheel. However, light sources such as LEDs with different colored lights are turned on in a time-division manner without using a color wheel. The present invention can also be applied to a projector that performs color sequential display.

DESCRIPTION OF SYMBOLS 10 Projector 11 Input / output connector part 12 Input / output interface 13 System bus 14 Buffer 15 Image conversion part 16 Projection image process part 17 Micromirror element 18 Projection light process part 19 Light source lamp 21 Color wheel 24 Projection lens 25 Motor 27 Control part 28 Memory | storage Section 29 Image recording section 141 First buffer 142 Second buffer

Claims (7)

A projector that sequentially captures frame images, and projects the captured images in a time-sharing manner using different emission colors for each frame,
Capture means for sequentially capturing the frame images;
Interpolated image generating means for generating an interpolated frame image that sequentially changes according to the time difference of the time-division projection based on temporally adjacent front and rear frame images captured by the capturing means;
Projection means for performing time-division projection with the different emission colors by interpolating the interpolated frame image generated by the interpolation image generation means between the previous and next frame images acquired by the acquisition means. projector. The projector according to claim 1, wherein the interpolation image generation unit generates a number of interpolation frame images corresponding to the number of time divisions. Storage means for sequentially storing temporally adjacent front and back frame images captured by the capture means;
3. The projector according to claim 1, wherein the interpolated image generating unit generates an interpolated frame image based on the front and rear frame images stored in the storage unit. Determination means for determining whether the image projected by the projection means is a moving image or a still image based on temporally adjacent front and rear frame images captured by the capture means;
A control means for operating the interpolated image generation means when the determination means determines that the video is a moving image;
2. The projection unit according to claim 1, wherein when the determination unit determines that the image is a still image, the projection unit projects the frame image captured by the capture unit in a time-sharing manner using the different emission colors. Or the projector of 3. Storage means for sequentially storing temporally adjacent front and back frame images captured by the capture means;
3. The determination unit according to claim 1, wherein the determination unit determines whether the image projected by the projection unit is a moving image or a still image based on the front and rear frame images stored in the storage unit. The projector described. A computer having a projector that sequentially captures frame images and projects in a time-sharing manner using different emission colors for each captured frame image,
Capture means for sequentially capturing the frame images;
Interpolated image generating means for generating an interpolated frame image that sequentially changes according to the time difference of the time-division projection based on temporally adjacent front and rear frame images captured by the capturing means;
An interpolated frame image generated by the interpolated image generating unit is inserted between the preceding and following frame images captured by the capturing unit, and the function is used as a projecting unit that performs time-division projection using the different emission colors. An image projection control program. An image projection method that sequentially captures frame images and performs time-division projection with different emission colors for each captured frame image,
A capturing step for sequentially capturing the frame images;
An interpolation image generation step for generating an interpolation frame image that sequentially changes in accordance with the time difference of the time-division projection based on temporally adjacent front and rear frame images captured by the capture step;
A projection step of performing time-division projection with the different emission colors by interpolating the interpolated frame image generated by the interpolated image generating step between the previous and subsequent frame images captured by the capturing step. And an image projection method.

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