WO2012176431A1 - 多視点画像生成装置、多視点画像生成方法 - Google Patents
多視点画像生成装置、多視点画像生成方法 Download PDFInfo
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- WO2012176431A1 WO2012176431A1 PCT/JP2012/003975 JP2012003975W WO2012176431A1 WO 2012176431 A1 WO2012176431 A1 WO 2012176431A1 JP 2012003975 W JP2012003975 W JP 2012003975W WO 2012176431 A1 WO2012176431 A1 WO 2012176431A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/30—Image reproducers
- H04N13/302—Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/10—Processing, recording or transmission of stereoscopic or multi-view image signals
- H04N13/106—Processing image signals
- H04N13/111—Transformation of image signals corresponding to virtual viewpoints, e.g. spatial image interpolation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/10—Processing, recording or transmission of stereoscopic or multi-view image signals
- H04N13/106—Processing image signals
- H04N13/128—Adjusting depth or disparity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N2013/0074—Stereoscopic image analysis
- H04N2013/0081—Depth or disparity estimation from stereoscopic image signals
Definitions
- the present invention relates to a technique for generating a multi-viewpoint image for an autostereoscopic display from left and right two-viewpoint images.
- Stereoscopic displays include a glasses-type stereoscopic display that uses light-transmitting and light-shielding switching using 3D glasses, and an autostereoscopic display that uses a parallax barrier such as a parallax barrier or a lenticular lens.
- the content displayed on the glasses-type stereoscopic display is composed of images from two left and right viewpoints, whereas the content displayed on the autostereoscopic display is not suitable for reverse viewing depending on the viewing position. Consists of viewpoint images.
- the current mainstream stereoscopic display is a glasses-type stereoscopic display
- most of the currently distributed 3D content is composed of images of two left and right viewpoints. For this reason, there is a lack of 3D content for autostereoscopic displays that require multi-viewpoint images.
- a multi-viewpoint image for an autostereoscopic display is generated using a technique for generating a multi-viewpoint image from two left-right viewpoint images.
- the technique disclosed in Patent Document 1 first, the inter-pixel distance in each pixel is calculated from the images of two left and right viewpoints by stereo matching.
- a multi-viewpoint image is generated from the left-right two-viewpoint image by interpolating or extrapolating the inter-pixel distance.
- the present invention has been made in view of the above circumstances, and an object thereof is to provide a multi-viewpoint image generation apparatus that generates a multi-viewpoint image suitable for display on an autostereoscopic display.
- a multi-viewpoint image generation device is a multi-viewpoint image generation device that generates a multi-viewpoint image for an autostereoscopic display, and an image that acquires two-right and left-viewpoint images.
- a display characteristic storage unit that stores display characteristics, a parallax analysis unit that adjusts the parallax amount calculated by the parallax calculation unit using the autostereoscopic display characteristics, and a parallax amount adjusted by the parallax analysis unit
- a multi-viewpoint image generating unit that generates a multi-viewpoint image by shifting each pixel of the left-right two-viewpoint image, and the multi-viewpoint image.
- a view synthesis unit for synthesizing a composite image obtained by synthesis by the view synthesis unit, and an outputting section which outputs the autostereoscopic display.
- the characteristics of the autostereoscopic display are stored in advance, and the parallax amount calculated by the parallax calculation unit is calculated using the characteristics of the autostereoscopic display. It is adjusted.
- a multi-viewpoint image with a parallax amount suitable for an autostereoscopic display can be generated, and a stereoscopic image fused with the whole screen can be displayed to the user without causing visual fatigue or difficulty in stereoscopic fusion. Can be provided.
- An autostereoscopic display generally has a higher amount of crosstalk in which left and right viewpoint images are mixed than a glasses-type stereoscopic display. Therefore, when viewing a video with a large amount of parallax between viewpoints (distance between pixels for each pixel) for Blu-ray 3D as it is, the video appears to be a double image without being fused, and the eyes are tired. The phenomenon of impairing the feeling occurs.
- the inventor generates a viewpoint image by interpolating or extrapolating the inter-pixel distance according to the viewpoint position in the multi-viewpoint generation system disclosed in Patent Document 1, so that depending on the scene, The amount of parallax between them increased, and the image was seen as a double image without melting, and the eyes were tired and the stereoscopic effect could be lost.
- the inventor has obtained one aspect of the invention shown below based on the above knowledge.
- a multi-viewpoint image generation device is a multi-viewpoint image generation device that generates a multi-viewpoint image for an autostereoscopic display, an image acquisition unit that acquires images of two left and right viewpoints, A parallax calculation unit that calculates the parallax amount between the left and right viewpoints from the viewpoint image, and stores the autostereoscopic display characteristics of the crosstalk amount in the autostereoscopic display or the recommended parallax amount in the autostereoscopic display.
- the display characteristic storage unit the parallax analysis unit that adjusts the parallax amount calculated by the parallax calculation unit using the autostereoscopic display characteristic, and the parallax amount adjusted by the parallax analysis unit,
- a multi-viewpoint image generation unit that generates a multi-viewpoint image by shifting each pixel of the viewpoint image; a viewpoint synthesis unit that combines the multi-viewpoint image;
- the characteristics of the autostereoscopic display are stored in advance, and the parallax amount calculated by the parallax calculation unit is adjusted using the characteristics of the autostereoscopic display.
- the parallax analysis unit further responds to a difference in parallax amount between a pixel to be processed and pixels around the pixel to be processed. Then, the parallax amount after adjusting the parallax amount using the autostereoscopic display characteristics is locally adjusted.
- the amount of parallax is adjusted according to the difference in amount of parallax between the pixel to be processed and its surrounding pixels, so that the contrast of the amount of parallax can be adjusted, and the stereoscopic effect is more emphasized.
- a viewpoint image can be generated.
- the disparity analysis unit is configured such that the difference in the amount of disparity between the pixel to be processed and pixels around the pixel to be processed has a predetermined value.
- the difference in the amount of parallax is increased, and when the difference in amount of parallax between the pixel to be processed and the pixels around the pixel to be processed is equal to or greater than a predetermined value, the difference in amount of parallax is decreased.
- the stereoscopic effect is reduced by reducing the difference in the amount of parallax, and when the difference in the amount of parallax with the surrounding pixels is small
- the three-dimensional effect can be strengthened by increasing the amount difference. Thereby, a multi-viewpoint image with enhanced stereoscopic effect can be provided to the user.
- the parallax analysis unit includes the parallax amount in the upper X% and the lower Y% in the parallax amount calculated by the parallax calculation unit.
- the parallax amount is adjusted so that a certain parallax amount falls within a recommended range of the parallax amount in the autostereoscopic display.
- the parallax amount is adjusted so that the parallax amount in the upper X% and the parallax amount in the lower Y% are within the recommended range of the parallax amount in the autostereoscopic display. Therefore, it is possible to generate a multi-viewpoint image having a parallax amount suitable for an autostereoscopic display. Even when there is a protruding amount of parallax in the 3D content, the amount of parallax can be adjusted appropriately without being influenced by the protruding value of the amount of parallax.
- the parallax analysis unit changes the values of X% and Y% according to the number of pixels having a parallax amount near 0.
- the parallax amount more suitable for a user can be adjusted by adjusting the parallax amount with the area of the screen surface vicinity.
- the parallax analysis unit uses the X% and Y% values as one or both of the left and right viewpoint images. Is changed according to the amount of motion between frames.
- the parallax amount more suitable for a user can be adjusted by adjusting the parallax amount according to the amount of motion between frames.
- the parallax analysis unit is configured such that the maximum value and the minimum value of the parallax amount calculated by the parallax calculation unit are parallaxes in the autostereoscopic display.
- the parallax amount is adjusted so as to be within the recommended range of the amount.
- the parallax amount suitable for the autostereoscopic display can be generated.
- the image acquisition unit is configured to perform a first operation that is assumed when the left and right two-viewpoint images are displayed on a general stereoscopic display.
- the crosstalk amount is acquired, and the parallax analysis unit compares the second crosstalk amount, which is the crosstalk amount in the autostereoscopic display stored in the display characteristic storage unit, with the first crosstalk amount. Then, the parallax amount is adjusted according to the ratio of the crosstalk amount.
- the crosstalk amount is approximately proportional to the recommended jump amount and the recommended depth amount
- the first crosstalk amount assumed when being displayed on the stereoscopic display, and the autostereoscopic view Generating a multi-viewpoint image having a parallax amount suitable for an autostereoscopic display by adjusting the parallax amount according to a ratio of the crosstalk amount to a second crosstalk amount which is a crosstalk amount in the display. Can do.
- the parallax analysis unit includes the parallax amount in the upper X% and the lower Y% in the parallax amount calculated by the parallax calculation unit.
- the multi-viewpoint image generation unit obtains a magnification for multiplying the parallax amount by a predetermined number so that a certain amount of parallax falls within a recommended range of the parallax amount in the autostereoscopic display.
- a plurality of multi-view image generation patterns adopted as a part of the multi-view image are selected using the magnification obtained by the parallax analyzer, and a multi-view image is generated using the selected multi-view image generation pattern.
- the parallax amount between the viewpoints is a parallax amount suitable for the autostereoscopic display from the left and right viewpoint images.
- the multi-viewpoint image generation unit refers to information on the effect of the viewer, and corresponds to the effect of the viewer in the multi-viewpoint image.
- the multi-viewpoint image generation pattern is selected so that more images of the two left and right viewpoints are assigned to the viewpoint image to be performed.
- the viewpoint so that the LR original image can be seen more effectively according to the effect information, it is possible to generate a multi-viewpoint image that can be fused and easily obtain a stereoscopic effect.
- the parallax analysis unit calculates a barycentric position of a pixel group in which the parallax amount calculated by the parallax calculation unit is near 0. And the amount of parallax is locally adjusted according to the distance between the center point of the region of interest and the pixel to be processed.
- the parallax of the area far from the on-screen area of interest that has a low resolution to feel between three-dimensional objects is weakened by reducing the amount of parallax of the area on the screen of interest that has high resolution to feel between the three-dimensional objects.
- the amount can be strengthened.
- a multi-viewpoint image generation device is a multi-viewpoint image generation device that generates a multi-viewpoint image for an autostereoscopic display, and an image acquisition unit that acquires images of two left and right viewpoints; Depth image acquisition unit that acquires a depth image indicating the depth of each pixel in the left and right viewpoint images, and the autostereoscopic display characteristics of the recommended value of the crosstalk amount in the autostereoscopic display or the parallax amount in the autostereoscopic display A parallax analysis unit that adjusts the parallax amount between the left and right viewpoints determined from the depth amount indicated in the depth image, using the autostereoscopic display characteristics, A multi-viewpoint image is obtained by shifting each pixel of the left-right two-viewpoint image using the parallax amount adjusted by the parallax analysis unit. Comprising a multi-view image generation unit that formed a view synthesis unit for synthesizing the multi-viewpoint image, a composite image obtained by synthesis by the view
- the parallax analysis unit further responds to a difference in parallax amount between a pixel to be processed and pixels around the pixel to be processed. Then, the parallax amount after adjusting the parallax amount using the autostereoscopic display characteristics is locally adjusted.
- the parallax amount is adjusted using the depth image indicating the depth of each pixel in the left and right two-viewpoint images, according to the difference in the parallax amount between the pixel to be processed and the surrounding pixels.
- the contrast of the parallax amount is adjusted, it is possible to generate a multi-viewpoint image with a more enhanced stereoscopic effect.
- the disparity analysis unit includes a disparity amount in the upper X% of disparity amounts determined from the depth amount indicated in the depth image, and The parallax amount is adjusted so that the parallax amount in the lower Y% is within the range of the recommended parallax amount in the autostereoscopic display.
- the parallax amount when the parallax amount is adjusted using the depth image indicating the depth of each pixel in the left and right viewpoint images, the upper X is within the range of the recommended value of the parallax amount in the autostereoscopic display. %, And the parallax amount is adjusted so that the parallax amount in the lower Y% falls within the parallax amount, so that a multi-viewpoint image having a parallax amount suitable for an autostereoscopic display can be generated. Further, even when there is a protruding amount of parallax in the 3D content, the amount of parallax can be adjusted without being influenced by the protruding value of the amount of parallax.
- a multi-viewpoint image generation device is a multi-viewpoint image generation device that generates a multi-viewpoint image for an autostereoscopic display, and an image acquisition unit that acquires images of two left and right viewpoints; Stores the parallax calculation unit that calculates the amount of parallax between the left and right viewpoints from the left and right viewpoint images, and the autostereoscopic display characteristics of the crosstalk amount in the autostereoscopic display or the recommended parallax amount in the autostereoscopic display The parallax calculated by the parallax calculation unit using the display characteristic storage unit that is being used, the autostereoscopic display characteristics, and the difference in parallax between the pixel to be processed and pixels around the pixel to be processed By using the parallax analyzer that adjusts the amount and the amount of parallax adjusted by the parallax analyzer, each pixel of the left and right viewpoint images is shifted to A multi-viewpoint image generation unit that generates an image; a viewpoint synthesis
- the parallax amount calculated by the parallax calculation unit is calculated using the autostereoscopic display characteristics and a difference in parallax amount between the pixel to be processed and a pixel around the pixel to be processed. Because it adjusts, it is a multi-viewpoint image with a three-dimensional effect fused on the entire screen, and the contrast of the amount of parallax is adjusted in the autostereoscopic display without causing visual fatigue or difficulty in three-dimensional fusion. A multi-viewpoint image can be generated.
- a multi-viewpoint image generation method is a multi-viewpoint image generation method for generating a multi-viewpoint image for an autostereoscopic display, and an image acquisition step for acquiring left and right two-viewpoint images; Stores the parallax amount calculation step for calculating the parallax amount between the left and right viewpoints from the left and right viewpoint images, and the autostereoscopic display characteristics of the crosstalk amount in the autostereoscopic display or the recommended value of the parallax amount in the autostereoscopic display Display characteristic storing step, Using the autostereoscopic display characteristics, the parallax amount adjustment step for adjusting the parallax amount calculated by the parallax amount calculation step, and the parallax amount adjusted by the parallax amount adjustment step, the left and right viewpoint images
- a multi-viewpoint image generation step for generating a multi-viewpoint image by shifting each pixel of the image, a viewpoint synthesis step for synthesizing the multi-viewpoint image, and a synthesized
- a multi-viewpoint image generation method capable of generating a multi-viewpoint image having a parallax amount suitable for an autostereoscopic display.
- FIG. 1 is a configuration diagram of the multi-viewpoint image generation apparatus according to the first embodiment.
- the multi-viewpoint image generation apparatus includes an image acquisition unit 101, a parallax calculation unit 102, a display characteristic storage unit 103, a parallax analysis unit 104, a viewpoint generation unit 105, a viewpoint synthesis unit 106, and an autostereoscopic display unit 107.
- the image acquisition unit 101 includes an image acquisition unit 101, a parallax calculation unit 102, a display characteristic storage unit 103, a parallax analysis unit 104, a viewpoint generation unit 105, a viewpoint synthesis unit 106, and an autostereoscopic display unit 107.
- the image acquisition unit 101 receives left-right (LR) bi-parallax images such as Blu-ray 3D, side-by-side, top-and-bottom, etc., decomposes them into left-eye images (L images) and right-eye images (R images), and calculates parallax
- LR left-right
- L images left-eye images
- R images right-eye images
- the image is output to the unit 102 and the viewpoint generation unit 105.
- the parallax calculation unit 102 calculates the inter-pixel distance in each pixel based on the L and R images output from the image acquisition unit 101 by a stereo image creation technique using a block matching method such as SAD or SSD or a graph cut. Calculate and output an L parallax image and an R parallax image for the L image and the R image.
- the display characteristic storage unit 103 is an autostereoscopic display device such as a crosstalk amount in an autostereoscopic display that outputs a multi-viewpoint image, or a recommended value of parallax amount in the autostereoscopic display (an amount of parallax popping out from a screen surface and an amount of depth parallax).
- the characteristics of the visual display are stored in a nonvolatile or volatile memory or the like and read by the parallax analyzer 104.
- the parallax analyzer 104 creates a parallax histogram or the like from the L parallax image and the R parallax image created by the parallax calculator 102, and based on the autostereoscopic display characteristic values stored in the display characteristic memory 103. The amount of parallax between viewpoints that is optimal for an autostereoscopic display is calculated. Thereafter, the L parallax image and the R parallax image are converted based on the calculated result, and are output to the viewpoint generation unit 105.
- the viewpoint generation unit 105 uses the parallax image and the R parallax image adjusted for the autostereoscopic display output from the parallax calculation unit 104 based on the L image and the R image output from the image acquisition unit 101.
- the autostereoscopic display unit 107 generates a viewpoint image having the required number of viewpoints by horizontally moving in accordance with the amount and the viewpoint position.
- the viewpoint synthesis unit 106 synthesizes the multi-viewpoint image output from the viewpoint generation unit 105 as an image to be displayed on the autostereoscopic display unit 107 and outputs the synthesized image to the autostereoscopic display unit 107.
- the autostereoscopic display unit 107 displays the composite image output from the viewpoint synthesis unit 106 through a parallax barrier or a lenticular lens. Thereby, autostereoscopic viewing is possible.
- FIG. 2 is a diagram illustrating an example of the parallax calculation unit 102 in FIG.
- 201 is an L image
- 202 is an object A reflected in the L image
- 203 is an object B reflected in the L image
- 211 is an L parallax image
- 212 is an object A in the L parallax image 211
- 213 is an L parallax image 211.
- Object B, 221 is an R image
- 222 is an object A reflected in the R image
- 223 is an object B reflected in the R image
- 231 is an R parallax image
- 232 is an object A in the R parallax image 231
- 233 is an object in the R parallax image 231 B.
- the object A 202 and the object B 203 are reflected, and the same object is reflected in the object A 222 and the object B 223 of the R image 221.
- the object A222 of the R image 221 has moved two pixels to the right from the same pixel position, and thus the parallax amount of the object A212 in the L parallax image 211 is 2.
- the search for the correspondence can be realized by using general SAD (SumSof Absolute Difference), SSD (Sum of Squared Difference), NCC (Normalized Cross-Correlation) or the like in block matching.
- the parallax amount of the object B 213 of the L parallax image 211 corresponding to the object B 203 of the L image 201 is 1.
- the right side is defined as + and the left side as-, and the direction of the parallax amount is defined.
- the parallax amount corresponding to the object A232 of the R parallax image 231 is 2 pixels, and the parallax amount corresponding to the object B233 is 1 pixel.
- FIG. 3 is a diagram showing an example of characteristics included in the display characteristic storage unit 103 in FIG.
- FIG. 4 is an example diagram of a disparity analysis unit according to Embodiment 1 of the present invention.
- 301 is a crosstalk amount
- 302 is a recommended jump amount
- 303 is a recommended depth amount.
- the amount of crosstalk 301 is the amount of light that appears when an image for one side (for example, the left eye) leaks to the other side (for example, the right eye) when viewing a stereoscopic image displayed on the display from an appropriate viewing position. It is a ratio. In the case of a multi-viewpoint image, this is the ratio of the amount of light that appears when an image for another viewpoint leaks when an image for a certain viewpoint is displayed.
- the value of the crosstalk amount 301 is calculated, for example, by displaying a test image independently for each viewpoint on an autostereoscopic display that displays a multi-viewpoint image, and measuring the luminance using a luminance meter. be able to.
- the recommended pop-up amount 302 is a limit parallax amount at which a stereoscopic image popping out from the screen surface (zero parallax between viewpoints) can be seen in a suitable viewing position on the autostereoscopic display, and the recommended depth amount 303 is This is the limit of the amount of parallax that can be seen when a stereoscopic image withdrawn from the screen surface is fused at an appropriate viewing position.
- the values of the recommended pop-up amount 302 and the recommended depth amount 304 are obtained by reproducing and evaluating various test images in which the parallax amount is associated in advance with the autostereoscopic display adjusted in advance at the appropriate viewing position. Number. Further, since it actually changes depending on the contrast value with the periphery, it may be provided for each contrast ratio with the periphery.
- FIG. 4A shows the result of adjusting the amount of parallax in accordance with the display characteristics.
- FIG. 4B is a diagram illustrating switching of the parallax conversion type.
- 4 (a) and 4 (b) 401 is the maximum amount of parallax, 402 is the minimum amount of parallax, 411 is the recommended amount of projection, 412 is the recommended amount of depth, 421 is the maximum amount of parallax corrected according to the characteristics, 422 is the minimum amount of parallax corrected according to the characteristics, and 431 to 433 are parallax amount conversion formulas that switch according to the absolute value difference of the parallax amount between the target pixel and surrounding pixels. When the amount of parallax is-, it appears to be retracted from the screen.
- the maximum parallax 421 is adjusted according to the characteristics by adjusting the parallax amount in the + direction by linear interpolation or the like so that the distance between the maximum parallax amount 401 and the screen surface having the zero parallax amount becomes the recommended pop-up amount Ru411. Corresponds to the recommended pop-up amount Ru411. Similarly, in the minimum parallax amount 402, the corrected maximum parallax amount 422 matches the recommended depth amount Rd412.
- the parallax analysis unit 104 acquires the maximum parallax amount and the minimum parallax amount among the parallax amounts in the image, and recommends the parallax amount recommended values (recommended pop-up amount Ru, recommended depth amount Rd). ) And the maximum parallax amount and the minimum parallax amount in the image, and the ratio of the parallax amounts is calculated as a parallax amount correction coefficient. Then, the parallax analyzer 104 multiplies the parallax amount of each pixel by the value indicated by the parallax amount correction coefficient to change the parallax amount. Thereby, the parallax amount of the two-viewpoint image can be adjusted so as to be within the range of the recommended parallax amount recommended in the autostereoscopic display.
- FIGS. 3 and 4 are examples of the multi-viewpoint image generation device according to one aspect of the present invention, and this configuration is not necessarily required.
- the parallax analysis unit 104 may adjust the parallax amount using the crosstalk amount characteristic of the autostereoscopic display stored in the display characteristic storage unit 103. Specifically, it is assumed that the crosstalk amount at the appropriate viewing position is CT% due to the characteristics of the autostereoscopic display, and the content of the left and right (LR) two viewpoints acquired by the image acquisition unit 101 is the crosstalk amount CT ′%. If it is made (for example, Blu-ray 3D made assuming active shutter glasses), it is assumed that the amount of crosstalk is roughly proportional to the recommended amount of projection and the recommended depth, and the parallax correction coefficient is set to that crosstalk. Calculated from the quantity ratio (CT / CT '(CT ⁇ CT')). Then, the parallax analyzer 104 multiplies the parallax amount of each pixel by the value indicated by the parallax amount correction coefficient to change the parallax amount.
- CT% due to the characteristics of the autostereoscopic display
- the upper X% and the lower Y% of the parallax amount histogram are searched by the p-tile method or the like, and the parallax in the upper X% of the parallax amounts calculated by the parallax calculation unit
- the amount of parallax may be adjusted so that the amount is the recommended pop-up amount and the amount of parallax in the lower Y% is the recommended depth amount.
- the parallax analysis unit 104 acquires the parallax amount in the upper X% and the parallax amount in the lower Y% among the parallax amounts in the image, and recommends the recommended parallax amount (recommended pop-up amount Ru).
- the recommended depth amount Rd) is compared with the parallax amount at the upper X% and the parallax amount at the lower Y% in the image, and the ratio of the parallax amounts is calculated as the parallax amount correction coefficient.
- the parallax amount is adjusted so that the parallax amount in the upper X% and the parallax amount in the lower Y% are within the recommended range of the parallax amount in the autostereoscopic display.
- a multi-viewpoint image having an appropriate amount of parallax can be generated. Even when there is a protruding amount of parallax in the 3D content, the amount of parallax can be adjusted appropriately without being influenced by the protruding value of the amount of parallax.
- the values of X% and Y% may be dynamically changed according to the area (number of pixels) around the screen surface (near parallax). Specifically, the X and Y values are increased if the area around the screen surface is large, and the X and Y values are decreased if the area around the screen surface is small.
- the values of X% and Y% are dynamically changed according to the amount of movement between the previous and next frames in one or both of the left and right viewpoint images acquired by the image acquisition unit 101. Good. Specifically, the X and Y values are increased if the amount of motion between frames is large, and the X and Y values are decreased if the amount of motion between frames is small.
- the parallax amount of the pixel to be processed (target pixel) and the surrounding parallax amount are evaluated, and the parallax is determined by the difference between the parallax amount of the target pixel and the average parallax amount of the peripheral pixels
- the amount may be adjusted. Specifically, the amount of parallax after adjusting the amount of parallax using the autostereoscopic display characteristics is locally adjusted according to the difference in amount of parallax between the pixel to be processed and pixels around the pixel to be processed To do.
- the difference in the amount of parallax between the pixel to be processed and the surrounding pixels of the pixel to be processed is equal to or less than a predetermined value
- the difference in the amount of parallax is increased, and the pixel to be processed and the process
- the difference in the amount of parallax with the surrounding pixels of the target pixel is greater than or equal to a predetermined value
- the difference in the amount of parallax is reduced.
- the range within the range is between the recommended jump amount and the recommended depth amount, but the dynamic is compressed locally.
- the purpose is to increase the effect. Since the contrast of the amount of parallax is adjusted according to the difference in the amount of parallax between the pixel to be processed and the surrounding pixels, it is possible to generate a multi-viewpoint image with a more enhanced stereoscopic effect.
- the parallax amount may be adjusted by switching from the parallax conversion equation 432 in FIG. 4B to the parallax conversion equation 431 or the parallax conversion equation 432 according to the absolute value difference between the parallax amounts of the target pixel and the surrounding pixels. Good.
- the parallax conversion equation 431 is applied so as to weaken the absolute difference because a feeling is obtained, and when the absolute difference is small, the contrast of the parallax amount is locally increased by applying 433 to obtain a sufficient stereoscopic effect. As a result, it is possible to adjust the amount of parallax between viewpoints that matches the characteristics of the autostereoscopic display.
- the present invention is not limited to this, and a simple difference may be used.
- the conversion of the amount of parallax may be locally adjusted depending on whether it is protruding or retracting (depth direction).
- the parallax may be locally adjusted according to the distance from the center point of the region of interest (for example, near the center of the screen or the barycentric position of the pixel group near zero parallax).
- the pixel located near the center point of the region of interest has high resolution to feel a three-dimensional effect, so the local parallax adjustment due to the difference between the target pixel and surrounding pixels is weakened so that it does not look like a double image.
- the resolution to feel the stereoscopic effect is weak, and even if it looks somewhat double, it is not anxious. Emphasize the feeling.
- FIG. 5 is a diagram showing an example of the operation of the viewpoint generation unit 105 in FIG.
- 501 is an L image
- 502 is an object A reflected in the L image 501
- 503 is an object B reflected in the L image 501
- 511 is an L parallax image
- 512 is an object A reflected in an L parallax image
- 513 is an L parallax image.
- Objects B and 521 are images obtained by moving the L image 501 to the right by 0.5 times the LR parallax
- 522 are objects A and 523 that appear in the moved image 521
- objects B and 532 and 533 that are reflected in the moved image 521 Is the place where a hole is opened in the image.
- FIG. 5 shows an example of generating a viewpoint at a position moved from the L image to the right by 0.5 times the LR parallax to the right using the L image 501 and the L parallax image 511.
- the LR parallax indicates the amount of parallax between the L image and the R image acquired by the image acquisition unit 101 in FIG. 1, and in this example, the viewpoint position is exactly at the center of the camera that captured the L image and the R image. Is equivalent to
- FIG. 5 is an example of the first embodiment of the present invention, and this configuration is not necessarily required.
- the viewpoint generation unit sets the viewpoint position from the L image to the right, but may set the viewpoint position to the left, and may generate the viewpoint in the vertical direction as well as horizontally. That is, an arbitrary horizontal and vertical viewpoint image can be generated from the parallax images of the L image and the R image.
- each pixel is moved by horizontal or vertical movement to generate a new viewpoint image, but this configuration is not necessarily required.
- feature points etc. are detected in advance using SHIFT and SURF, corresponding points are calculated, and each polygonal area connecting the feature points is converted using perspective projection transformation etc. It may be generated.
- viewpoint generation unit 105 in FIG. 1 actively uses an LR image to create a high-quality viewpoint generation image
- FIG. 6 determines how many times the amount of parallax between the viewpoints should be increased from the LR that is the amount of parallax between the L image and the R image generated by the image acquisition unit of FIG. This is an example of generating multiple viewpoints with the amount of parallax between viewpoints corresponding to the value, and is an example of generating eight viewpoints from viewpoint images 01 to 08.
- the viewpoint generation unit 105 selects a multi-view image generation pattern based on the magnification used when the parallax amount is adjusted by the parallax analysis unit 104, and generates a multi-view image using the selected multi-view image generation pattern. .
- the viewpoint generation unit 105 obtains the magnification obtained by the parallax analysis unit from 0.30 times.
- a pattern 604 having a small parallax amount of 0.25 times is selected.
- eight viewpoints from the viewpoint images 01 to 08 are generated using the selected pattern, and each viewpoint image is generated by multiplying the parallax amount of the parallax image by 0.25 ⁇ n (n varies from the viewpoint position).
- the original L image is assigned to the viewpoint image 03 and the R image is assigned to the viewpoint image 07, and three viewpoints from 04 to 06 are included inside the L image and the R image.
- the viewpoint analysis unit 105 only analyzes the ideal amount of parallax between the viewpoints, and corrects the amount of parallax in the parallax image and outputs the parallax image to the viewpoint generation unit 105 as shown in FIG. do not do.
- FIGS. 7A and 7B are diagrams illustrating an example of a 4-viewpoint image in which the amount of parallax between viewpoints is generated at 0.50LR.
- the effect is the right eye.
- the generation patterns include a pattern shown in FIG. 7A and a pattern shown in FIG. 7B.
- the multi-viewpoint image generation pattern is selected so that more images of the two left and right viewpoints are assigned to the viewpoint image corresponding to the effect of the viewer among the multi-viewpoint images.
- two multi-viewpoint image generation patterns can be considered.
- viewpoints so that the LR original image can be seen more effectively according to the effect information set in step 1
- effect information of a person registered in advance by a technique such as face authentication may be taken out and automatically switched.
- FIG. 8 shows an example of the viewpoint synthesis unit 106 when the autostereoscopic display unit 107 in FIG. 1 includes a six-view parallax barrier.
- the parallax barrier has holes for every six viewpoints in the sub pixel unit, it is necessary to synthesize the parallax barrier in the sub pixel unit. Therefore, the sub-pixels at each viewpoint are filled according to the RGB order of the sub-pixels. For example, since the upper left sub-pixel 801 of the composite image 800 is an R component, the sub-pixel 811 corresponding to the upper left R component of the first viewpoint image 810 is filled.
- the sub pixel 804 adjacent to the sub pixel 801 of the composite image 800 is filled with a sub pixel 824 corresponding to the upper left G component of the second viewpoint image 820 because of the G component.
- the sub pixel 812 corresponding to the upper left G component of the first viewpoint image 810 corresponds to the upper left B component of the first viewpoint image 810 to the sub pixel 802 corresponding to the G component of the second row of the composite image 800.
- the sub pixel 813 to be embedded is filled into 803 corresponding to the B component in the third row of the composite image 800.
- a composite image 800 can be generated by extracting and combining the pixels. Note that FIG. 8 is an example of a synthesis example, and this configuration is not necessarily required.
- each viewpoint image reduced in the horizontal direction by the number of viewpoints with respect to the resolution of the composite image may be prepared, and may be filled in sub-pixel units, or the vertical resolution may be increased (the composite image and each viewpoint image The vertical position matches).
- FIG. 9 is a flowchart showing the flow of processing of the multi-viewpoint image generation device according to one aspect of the present invention.
- the image acquisition unit 101 acquires images from two left and right viewpoints (step S901).
- the parallax calculation unit 102 calculates the amount of parallax between the left and right viewpoint images acquired by the image acquisition unit 101 (step S902). Specifically, the parallax calculation unit 102 calculates the inter-pixel distance in each pixel by a stereo image creation technique using a block matching method such as SAD or SSD or a graph cut, and the L parallax for the L image and the R image. An image and an R parallax image are generated.
- a stereo image creation technique such as SAD or SSD or a graph cut
- the parallax analyzer 104 reads the characteristics of the autostereoscopic display stored in the display characteristics storage 103 (step S903).
- the parallax analysis unit 104 adjusts the parallax amount calculated by the parallax calculation unit 102 using the read characteristics of the autostereoscopic display (step S904). Details of this parallax amount adjustment processing will be described later.
- the viewpoint generation unit 105 generates a multi-viewpoint image using the parallax amount adjusted by the parallax analysis unit 104 (step S905). This multi-viewpoint image generation process will be described later.
- the viewpoint synthesis unit 106 synthesizes the multi-viewpoint image generated by the viewpoint generation unit 105 (step S906).
- the viewpoint synthesis unit 106 outputs the synthesized image obtained by the synthesis process in step S906 to the autostereoscopic display unit 107, and the autostereoscopic display unit 107 displays the synthesized image (step S907).
- FIG. 10 is a flowchart showing details of the parallax amount adjustment processing.
- the parallax analysis unit 104 determines whether or not information on the recommended value of the parallax amount in the autostereoscopic display is stored in the display characteristic storage unit 103 (step 1001).
- the parallax analysis unit 104 acquires the recommended value of the parallax amount in the autostereoscopic display from the display characteristic storage unit 103. (Step S1002).
- the parallax analysis unit 104 acquires the maximum parallax amount and the minimum parallax amount among the parallax amounts in the image (step S1003).
- the parallax analysis unit 104 compares the recommended value of the parallax amount with the maximum parallax amount and the minimum parallax amount in the image, and calculates the parallax amount ratio as a parallax amount correction coefficient (step S1004).
- the parallax analysis unit 104 displays the two-viewpoint image acquired by the image acquisition unit 101 on a general stereoscopic display ( For example, a crosstalk amount (first crosstalk amount) that is assumed when the image is displayed on a stereoscopic display that reproduces BD-3D is acquired (step S1005).
- the parallax analyzer 104 acquires the crosstalk amount (second crosstalk amount) of the autostereoscopic display from the display storage unit 103 (step S1006).
- the parallax analysis unit 104 compares the first crosstalk amount and the second crosstalk amount, and calculates the ratio of the crosstalk amount as a parallax amount correction coefficient (step S1007).
- the parallax analyzer 104 multiplies the parallax amount of each pixel by the value indicated by the parallax amount correction coefficient to change the parallax amount (step S1008). Thereby, the parallax amount of the two-viewpoint image can be adjusted so as to be within the range of the recommended parallax amount recommended in the autostereoscopic display.
- the parallax analysis unit 104 acquires a difference in parallax amount between the pixel to be processed and its surrounding pixels, and further locally adjusts the parallax amount adjusted using display characteristics according to the difference in parallax amount. Adjustment is made (step S1009). Specifically, when the difference in the amount of parallax between the processing target pixel and the surrounding pixels of the processing target pixel is equal to or less than a predetermined value, the difference in the amount of parallax is increased, and the processing target pixel and the processing target pixel When the difference in the amount of parallax from the surrounding pixels is greater than or equal to a predetermined value, the difference in the amount of parallax is weakened.
- step S905 This completes the description of the details of the parallax amount adjustment processing in step S904. Next, details of the multi-viewpoint image generation process in step S905 will be described.
- FIG. 11 is a flowchart showing details of the multi-viewpoint image generation process.
- the viewpoint generation unit 105 acquires the parallax amount correction coefficient used for adjusting the parallax amount (step S1101).
- the viewpoint generation unit 105 selects a multi-viewpoint image generation pattern based on the acquired parallax amount correction coefficient (step S1102).
- the viewpoint generation unit 105 shifts each pixel of the left and right viewpoint images by the number of pixels determined from the parallax amount adjusted by the parallax analysis unit 104 and the selected multi-view image generation pattern, and generates a multi-view image. (Step S1103).
- the processing shown in FIG. 12 can be considered as a modification of the above-described multi-viewpoint image generation processing.
- the viewpoint generation unit 105 obtains the effect information of the viewer (step S1201).
- the efficacy information is stored in a nonvolatile or volatile memory or the like, and the viewpoint generation unit 105 reads the efficacy information from the memory or the like.
- the viewpoint generation unit 105 selects a multi-viewpoint image generation pattern using the parallax amount correction coefficient and the effect information (step S1202). This makes it possible to select a multi-viewpoint image generation pattern that assigns more images of two left and right viewpoints to the viewpoint image corresponding to the viewer's effect among the multi-viewpoint images.
- the multi-viewpoint image generation apparatus is different from the first embodiment in that it acquires a depth image indicating the depth of each pixel of a two-viewpoint image and generates a multi-viewpoint image using the acquired depth image. This is different from such a multi-viewpoint image generation apparatus.
- FIG. 13 is a configuration diagram of the positioning processing apparatus according to the second embodiment of the present invention.
- reference numeral 1301 denotes a depth image acquisition unit, which acquires a depth image input from the outside and sends it to the parallax analysis unit 1302.
- content created with CG, etc. contains 3D model data, so it is easy to output accurate 3D depth information, and it is possible to easily create depth images on the content side. It is.
- a distance sensor such as TOF (Time-of-Flight) can simultaneously acquire a grayscale image and a distance (depth) image.
- the depth image output from the depth image acquisition unit 1301 is not the amount of parallax that is the distance between the pixels of the L image and the R image as in the first embodiment, but the three-dimensional acquired from the CG model or the TOF sensor. This is a value storing the depth information. Therefore, the parallax analysis unit 1302 needs to convert the depth information corresponding to the pixel value in the depth image into the range of the recommended pop-up amount and the recommended depth amount parallax amount called from the display characteristic storage unit 103. A simple conversion example will be described with reference to FIG.
- FIG. 14 is an example of converting the parallax amount from the depth image.
- 1401 is the minimum depth amount in the depth image
- 1402 is the maximum depth amount in the depth image
- 1403 is the depth amount corresponding to the screen surface (zero parallax)
- 1404 is the recommended depth amount
- 1405 is the recommended jump amount. Is the average depth.
- the parallax analyzer 1302 converts the minimum depth 1401 in the depth image into a recommended depth 1404 and the maximum depth 1402 into a recommended pop-up 1405.
- the parallax analysis unit 1302 assigns an average depth value 1406 to the screen surface 1403 with zero parallax, and converts the depth amount and the parallax amount by linear interpolation in each section.
- the depth information of the target pixel and the surrounding pixels is used.
- the amount of parallax may be locally converted and adjusted.
- the parallax generation unit 105 receives the parallax image and the image acquisition unit 101 from the parallax image and the image acquisition unit 101 as in the first embodiment. Based on the acquired input image, a plurality of viewpoints are generated, the multiple viewpoints are combined by the parallax combining unit 106, and displayed by the autostereoscopic display unit 107.
- FIG. 15 is a flowchart of a process flow of the multi-viewpoint image generation apparatus according to the second embodiment. The same parts as those in the operation of the multi-viewpoint image generation apparatus according to the first embodiment shown in FIG.
- the depth image acquisition unit 1201 After acquiring the left and right viewpoint images (step S901), the depth image acquisition unit 1201 acquires the depth image (step S1501).
- the viewpoint analysis unit 1302 After reading out the characteristics of the autostereoscopic display (step S903), the viewpoint analysis unit 1302 uses the characteristics of the autostereoscopic display to view the depth amount indicated in the depth image on the autostereoscopic display. The parallax amount is converted into a suitable amount (step S1502).
- step S1502 the processing from step S905 to step S907 is performed.
- the present invention may be an application execution method disclosed by the processing procedure described in each embodiment. Further, the present invention may be a computer program including program code that causes a computer to operate according to the processing procedure.
- the present invention can also be implemented as an LSI that controls the multi-viewpoint image generation apparatus described in each of the above embodiments.
- Such an LSI can be realized by integrating functional blocks such as the parallax calculation unit 102 and the parallax analysis unit 103. These functional blocks may be individually made into one chip, or may be made into one chip so as to include a part or all of them.
- LSI is used, but depending on the degree of integration, it may be called IC, system LSI, super LSI, or ultra LSI.
- the method of circuit integration is not limited to LSI, and implementation with a dedicated circuit or a general-purpose processor is also possible.
- An FPGA Field Programmable Gate Array
- a reconfigurable processor that can reconfigure the connection and setting of circuit cells inside the LSI may be used.
- the present invention can also be realized as a three-dimensional image display device such as a digital television, a mobile phone device, or a personal computer including the multi-viewpoint image generation device described in each of the above embodiments. Further, it can be realized as a playback device such as a BD player or a DVD player including the multi-viewpoint image generation device described in each of the above embodiments.
- the viewpoint generation device adjusts the amount of parallax between viewpoints in accordance with the characteristics of the autostereoscopic display, so that the entire screen can be fused to realize autostereoscopic vision with a stereoscopic effect. Be beneficial.
- FIG. 7A 702 Multiview image generation in FIG. 7A Viewing example of the 02 and 03 viewpoints in the pattern 703 Viewing example of the 03 and 04 viewpoints in the multi-view image generation pattern in FIG. 7A 704 Viewing example of the 01 and 02 viewpoints in the multi-view image generation pattern in FIG. 7B 705 Viewing example of the 02 and 03 viewpoints in the multi-view image generation pattern in FIG. 7B 706 Viewing example of the 03 and 04 viewpoints in the multi-view image generation pattern in FIG.
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Abstract
Description
まず、本発明にかかる一態様の基礎となった知見について説明する。
本発明の一態様である多視点画像生成装置は、裸眼立体視ディスプレイに対する多視点画像を生成する多視点画像生成装置であって、左右二視点の画像を取得する画像取得部と、前記左右二視点の画像から、左右二視点間の視差量を算出する視差計算部と、裸眼立体視ディスプレイにおけるクロストーク量または裸眼立体視ディスプレイにおける視差量の推奨値の裸眼立体視ディスプレイ特性を記憶しているディスプレイ特性記憶部と、前記裸眼立体視ディスプレイ特性を用いて、前記視差計算部が算出した視差量を調整する視差解析部と、前記視差解析部により調整された視差量を用いて、前記左右二視点の画像の各画素をシフトさせることにより、多視点画像を生成する多視点画像生成部と、前記多視点画像を合成する視点合成部と、前記視点合成部による合成により得られる合成画像を、裸眼立体視ディスプレイに対して出力する出力部とを備える。
前記裸眼立体視ディスプレイ特性を用いて、前記視差量算出ステップが算出した視差量を調整する視差量調整ステップと、前記視差量調整ステップにより調整された視差量を用いて、前記左右二視点の画像の各画素をシフトさせることにより、多視点画像を生成する多視点画像生成ステップと、前記多視点画像を合成する視点合成ステップと、前記視点合成ステップによる合成により得られる合成画像を、裸眼立体視ディスプレイに対して出力する出力ステップとを含む。
以下では、本発明の実施の形態について、図面を参照しながら説明する。
実施の形態2にかかる多視点画像生成装置は、二視点画像の各画素の奥行きを示す奥行き画像を取得し、取得した奥行き画像を用いて多視点画像を生成する点において、実施の形態1にかかる多視点画像生成装置と異なる。
なお、上記の実施の形態に基づいて説明してきたが、本発明は上記の実施の形態に限定されないことはもちろんである。以下のような場合も本発明に含まれる。
102 視差計算部
103 ディスプレイ特性記憶部
104 視差解析部
105 視点生成部
106 視点合成部
107 裸眼立体表示部
201 L画像
202 L画像における物体A
203 L画像における物体B
211 L視差画像
212 L視差画像における物体A
213 L視差画像における物体B
221 R画像
222 R画像における物体A
223 R画像における物体B
231 R視差画像
232 R視差画像における物体A
233 R視差画像における物体B
301 クロストーク量
302 推奨飛出量
303 推奨奥行量
401 最大視差量
402 最小視差量
411 推奨飛出量
412 推奨奥行量
421 特性に合わせて修正した最大視差量
422 特性に合わせて修正した最小視差量
431、432、433 注目画素と周辺画素の視差量の絶対値差に応じて切り替わる視差量変換式
501 L画像
502 L画像における物体A
503 L画像における物体B
511 L視差画像
512 L視差画像における物体A
513 L視差画像における物体B
601、602、603、604、605、606 視点生成部における視点生成のパターン
701 図7(a)の多視点画像生成パターンにおける01、02視点の視聴例
702 図7(a)の多視点画像生成パターンにおける02、03視点の視聴例
703 図7(a)の多視点画像生成パターンにおける03、04視点の視聴例
704 図7(b)の多視点画像生成パターンにおける01、02視点の視聴例
705 図7(b)の多視点画像生成パターンにおける02、03視点の視聴例
706 図7(b)の多視点画像生成パターンにおける03、04視点の視聴例
800 合成画像
801 合成画像における左上付近のR成分のサブ画素
802 合成画像における左上付近のG成分のサブ画素1
803 合成画像における左上付近のB成分のサブ画素
804 合成画像における左上付近のG成分のサブ画素2
810 第1視点画像
811 第1視点画像における左上付近のR成分のサブ画素
812 第1視点画像における左上付近のG成分のサブ画素
813 第1視点画像における左上付近のB成分のサブ画素
820 第2視点画像
824 第2視点画像における左上付近のG成分のサブ画素
1301 奥行画像取得部
1302 視差解析部
1401 奥行画像における最小奥行量
1402 奥行画像における最大奥行量
1403 スクリーン面に相当する奥行量
1404 推奨奥行量
1405 推奨飛出量
1406 奥行量の平均値
Claims (16)
- 裸眼立体視ディスプレイに対する多視点画像を生成する多視点画像生成装置であって、
左右二視点の画像を取得する画像取得部と、
前記左右二視点の画像から、左右二視点間の視差量を算出する視差計算部と、
裸眼立体視ディスプレイにおけるクロストーク量または裸眼立体視ディスプレイにおける視差量の推奨値の裸眼立体視ディスプレイ特性を記憶しているディスプレイ特性記憶部と、
前記裸眼立体視ディスプレイ特性を用いて、前記視差計算部が算出した視差量を調整する視差解析部と、
前記視差解析部により調整された視差量を用いて、前記左右二視点の画像の各画素をシフトさせることにより、多視点画像を生成する多視点画像生成部と、
前記多視点画像を合成する視点合成部と、
前記視点合成部による合成により得られる合成画像を、裸眼立体視ディスプレイに対して出力する出力部とを備える
ことを特徴とする多視点画像生成装置。 - 前記視差解析部は、さらに、
処理対象の画素と当該処理対象の画素の周辺の画素との視差量の差に応じて、前記裸眼立体視ディスプレイ特性を用いた視差量の調整後の視差量を局所的に調整する
ことを特徴とする請求項1に記載の多視点画像生成装置。 - 前記視差解析部は、
処理対象の画素と当該処理対象の画素の周辺の画素との視差量の差が所定の値以下である場合、当該視差量の差を強め、
処理対象の画素と当該処理対象の画素の周辺の画素との視差量の差が所定の値以上である場合、当該視差量の差を弱める
ことを特徴とする請求項2に記載の多視点画像生成装置。 - 前記視差解析部は、
前記視差計算部が算出した視差量のうち上位X%にある視差量、および下位Y%にある視差量が、前記裸眼立体視ディスプレイにおける視差量の推奨値の範囲に収まるように前記視差量を調整する
ことを特徴とする請求項1乃至請求項3のいずれか1項に記載の多視点画像生成装置。 - 前記視差解析部は、
前記X%およびY%の値を、0付近の視差量を有する画素の数に応じて変化させる
ことを特徴とする請求項4に記載の多視点画像生成装置。 - 前記視差解析部は、
前記X%およびY%の値を、前記左右二視点の画像のうち、一方または両方の画像におけるフレーム間の動きの量に応じて変化させる
ことを特徴とする請求項4に記載の多視点画像生成装置。 - 前記視差解析部は、
前記視差計算部が算出した視差量の最大値および最小値が、前記裸眼立体視ディスプレイにおける視差量の推奨値の範囲に収まるように前記視差量を調整する
ことを特徴とする請求項1乃至請求項6のいずれか1項に記載の多視点画像生成装置。 - 前記画像取得部は、
前記左右二視点の画像が、一般立体視ディスプレイに表示される際に想定される第1のクロストーク量を取得し、
前記視差解析部は、
前記ディスプレイ特性記憶部に記憶される裸眼立体視ディスプレイにおけるクロストーク量である第2のクロストーク量と、前記第1のクロストーク量とを比較し、そのクロストーク量の比に応じて前記視差量を調整する
ことを特徴とする請求項1乃至請求項7のいずれか1項に記載の多視点画像生成装置。 - 前記視差解析部は、
前記視差計算部が算出した視差量のうち上位X%にある視差量、および下位Y%にある視差量が、前記裸眼立体視ディスプレイにおける視差量の推奨値の範囲に収まるように視差量を所定数倍する際の倍率を求め、
前記多視点画像生成部は、
前記左右二視点の画像を多視点画像の一部として採用した複数の多視点画像生成パターンを、前記視差解析部が求めた前記倍率を用いて選択し、選択した多視点画像生成パターンを用いて多視点画像を生成する
ことを特徴とする請求項1乃至請求項8のいずれか1項に記載の視点生成装置。 - 前記多視点画像生成部は、
視聴者の効き目の情報を参照し、多視点画像のうち、視聴者の効き目に該当する視点画像へ前記左右二視点の画像がより多く割り当てられるように多視点画像生成パターンを選択する
ことを特徴とする請求項9に記載の視点生成装置。 - 前記視差解析部は、
前記視差計算部が算出した視差量の値が0付近である画素群の重心位置を興味領域の中心点して定め、当該興味領域の中心点と処理対象の画素との距離に応じて、局所的に視差量を調整する
ことを特徴とする請求項1乃至請求項10のいずれか1項に記載の視点生成装置 - 裸眼立体視ディスプレイに対する多視点画像を生成する多視点画像生成装置であって、
左右二視点の画像を取得する画像取得部と、
前記左右二視点の画像における個々の画素の奥行きを示す奥行画像を取得する奥行画像取得部と、
裸眼立体視ディスプレイにおけるクロストーク量、または裸眼立体視ディスプレイにおける視差量の推奨値の裸眼立体視ディスプレイ特性を記憶しているディスプレイ特性記憶部と、
前記裸眼立体視ディスプレイ特性を用いて、前記奥行画像に示される奥行き量から定まる前記左右二視点の画像間の視差量を調整する視差解析部と、
前記視差解析部により調整された視差量を用いて、前記左右二視点の画像の各画素をシフトさせることにより、多視点画像を生成する多視点画像生成部と、
前記多視点画像を合成する視点合成部と、
前記視点合成部による合成により得られる合成画像を、裸眼立体視ディスプレイに対して出力する出力部とを備える
ことを特徴とする多視点画像生成装置。 - 前記視差解析部は、さらに、
処理対象の画素と当該処理対象の画素の周辺の画素との視差量の差に応じて、前記裸眼立体視ディスプレイ特性を用いた視差量の調整後の視差量を局所的に調整する
ことを特徴とする請求項12に記載の多視点画像生成装置。 - 前記視差解析部は、
前記奥行画像に示される奥行き量から定まる視差量のうち、上位X%にある視差量、および下位Y%にある視差量が、前記裸眼立体視ディスプレイにおける視差量の推奨値の範囲に収まるように視差量を調整する
ことを特徴とする請求項12乃至請求項13のいずれか1項に記載の多視点画像生成装置。 - 裸眼立体視ディスプレイに対する多視点画像を生成する多視点画像生成装置であって、
左右二視点の画像を取得する画像取得部と、
前記左右二視点の画像から、左右二視点間の視差量を算出する視差計算部と、
裸眼立体視ディスプレイにおけるクロストーク量、または裸眼立体視ディスプレイにおける視差量の推奨値の裸眼立体視ディスプレイ特性を記憶しているディスプレイ特性記憶部と、
前記裸眼立体視ディスプレイ特性と、処理対象の画素と当該処理対象の画素の周辺の画素との視差量の差とを用いて、前記視差計算部が算出した視差量を調整する視差解析部と、
前記視差解析部により調整された視差量を用いて、前記左右二視点の画像の各画素をシフトさせることにより、多視点画像を生成する多視点画像生成部と、
前記多視点画像を合成する視点合成部と、
前記視点合成部による合成により得られる合成画像を、裸眼立体視ディスプレイに対して出力する出力部とを備える
ことを特徴とする多視点画像生成装置。 - 裸眼立体視ディスプレイに対する多視点画像を生成する多視点画像生成方法であって、
左右二視点の画像を取得する画像取得ステップと、
前記左右二視点の画像から、左右二視点間の視差量を算出する視差量算出ステップと、
裸眼立体視ディスプレイにおけるクロストーク量または裸眼立体視ディスプレイにおける視差量の推奨値の裸眼立体視ディスプレイ特性を記憶しているディスプレイ特性記憶ステップと、
前記裸眼立体視ディスプレイ特性を用いて、前記視差量算出ステップが算出した視差量を調整する視差量調整ステップと、
前記視差量調整ステップにより調整された視差量を用いて、前記左右二視点の画像の各画素をシフトさせることにより、多視点画像を生成する多視点画像生成ステップと、
前記多視点画像を合成する視点合成ステップと、
前記視点合成ステップによる合成により得られる合成画像を、裸眼立体視ディスプレイに対して出力する出力ステップとを含む
ことを特徴とする多視点画像生成方法。
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