JP2011040946A - Image processor and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reliably suppress crosstalk in displaying stereoscopic video images. <P>SOLUTION: The image processor includes: a signal control part 120 for receiving input of image signals and converting them to signals for displaying each of a right-eye image and a left-eye image continuously at least twice; a parallax amount detection part 306 for detecting the parallax of the right-eye image and the left-eye image; and an LPF processing part 320 for low-pass filtering the right-eye image and the left-eye image on the basis of the parallax amount. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an image processing apparatus and a program.

  Conventionally, as described in, for example, the following patent document, a liquid crystal shutter that supplies a left-eye image and a right-eye image having parallax alternately to a display at a predetermined cycle and is driven in synchronization with the predetermined cycle. There is known a method of observing with spectacles equipped with the above.

JP-A-9-138384 JP 2000-36969 A JP 2003-45343 A Japanese Patent No. 3784967

  However, as in the above-described conventional example, when a stereoscopic video display is observed with the shutter glasses method, problems due to characteristics of the display device and shutter glasses, such as insufficient response speed of the image display device and insufficient contrast of the liquid crystal shutter, occur. . Due to these factors, a phenomenon occurs in which part of the image for the right eye leaks to the left eye and part of the image for the left eye leaks to the right eye (hereinafter referred to as crosstalk).

  In particular, in the above-described stereoscopic image display observation system, when the display is composed of a liquid crystal display or the like, the response speed becomes a problem. That is, in a liquid crystal display, a video signal is supplied line-sequentially from one end of the screen (such as the upper side of the screen) to the other end (such as the lower side of the screen), but from one end to the other end. There is a response delay in the writing timing.

  Due to the lack of response speed of the liquid crystal, when writing the right-eye image, when the upper side of the screen reaches a desired luminance, the right-eye image is finally started to be written on the lower side of the screen. Also in the writing of the left-eye image, when the upper side of the screen reaches a desired luminance, the writing of the left-eye image is finally started on the lower side of the screen.

  For this reason, it becomes difficult to open the liquid crystal shutter at the timing when only one of the right-eye image and the left-eye image is displayed on both the upper side and the lower side of the screen, and the right-eye image and the left-eye image are mixed to the user. The problem of visible crosstalk occurs. Further, due to the lack of response speed of the liquid crystal, when the liquid crystal shutter is opened in a state where the liquid crystal is not responding completely, there is a problem that the user cannot visually recognize an image with a desired luminance.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is a new and improved technique capable of reliably suppressing the occurrence of crosstalk when displaying a stereoscopic image. An image processing apparatus and a program are provided.

  In order to solve the above problems, according to one aspect of the present invention, a signal control that receives an input of an image signal and converts the image into a signal for displaying each of the right-eye image and the left-eye image at least twice in succession. A parallax detection unit that detects a parallax between the right-eye image and the left-eye image, and an LPF processing unit that performs a low-pass filtering process on the right-eye image and the left-eye image based on the parallax amount. A processing device is provided.

  The LPF processing unit may switch the number of taps of the low-pass filter in accordance with the parallax amount.

  The LPF processing unit adds a correction amount by LPF processing to the original signals of the right-eye image and the left-eye image, and multiplies the correction amount by a gain that increases as the parallax amount increases. There may be.

  In order to solve the above problems, according to another aspect of the present invention, an image signal is received and converted into a signal for displaying each of the right-eye image and the left-eye image at least twice in succession. A signal control unit that detects the contrast between the right-eye image and the left-eye image, and an LPF processing unit that performs low-pass filtering on the right-eye image and the left-eye image based on the contrast. An image processing apparatus is provided.

  The LPF processing unit adds a correction amount by LPF processing to the original signals of the right-eye image and the left-eye image, and corrects a gain that increases with an increase in an index value that represents the contrast magnitude. The amount may be multiplied.

  Further, the contrast detection unit may detect a difference value between signals of the left-eye image and the right-eye image in the target pixel as the index value.

  In order to solve the above problems, according to another aspect of the present invention, an image signal is received and converted into a signal for displaying each of the right-eye image and the left-eye image at least twice in succession. An image processing unit, a vertical position detection unit that detects a vertical position of an image, and an LPF processing unit that performs a low-pass filtering process on the right-eye image and the left-eye image based on the vertical position. An apparatus is provided.

  The signal control unit converts each of the right-eye image and the left-eye image into a signal to be displayed twice in succession, and the LPF processing unit converts the right-eye image or the left-eye image in succession twice. In the first frame of the image, a gain that increases from the upper part of the screen toward the lower part of the screen may be multiplied by the correction amount by the low-pass filtering process.

  The signal control unit converts each of the right-eye image and the left-eye image into a signal to be displayed twice in succession, and the LPF processing unit converts the right-eye image or the left-eye image in succession twice. In the second frame of the image, a gain that increases from the lower part of the screen toward the upper part of the screen may be multiplied by the correction amount by the low-pass filtering process.

  In order to solve the above problems, according to another aspect of the present invention, an image signal is received and converted into a signal for displaying each of the right-eye image and the left-eye image at least twice in succession. Provided is a program for causing a computer to function as a means for detecting, a means for detecting a parallax between a right-eye image and a left-eye image, a means for performing low-pass filtering on the right-eye image and the left-eye image based on the amount of parallax Is done.

  In order to solve the above problems, according to another aspect of the present invention, an image signal is received and converted into a signal for displaying each of the right-eye image and the left-eye image at least twice in succession. There is provided a program for causing a computer to function as a means for detecting, a means for detecting a contrast between a right-eye image and a left-eye image, a means for performing low-pass filtering on the right-eye image and the left-eye image based on the contrast. The

  In order to solve the above problems, according to another aspect of the present invention, an image signal is received and converted into a signal for displaying each of the right-eye image and the left-eye image at least twice in succession. There is provided a program for causing a computer to function as a means for detecting, a means for detecting a vertical position of an image, and means for performing a low-pass filtering process on the right-eye image and the left-eye image based on the vertical position.

  According to the present invention, it is possible to reliably suppress the occurrence of crosstalk when displaying a stereoscopic image.

It is a schematic diagram which shows the structure of the stereo image display observation system which concerns on one Embodiment of this invention. It is a block diagram which shows the structure of an image display apparatus. 5 is a timing chart showing the principle of twice writing according to the present embodiment and the opening and closing of the liquid crystal shutter. FIG. 6 is a characteristic diagram showing the response characteristics of the liquid crystal with respect to the screen vertical position by approximating the response characteristics of the liquid crystal with an exponential function. FIG. 5 is a characteristic diagram illustrating a change in luminance with respect to a screen vertical position when integration is performed with an opening time of the shutter in the characteristic of FIG. 4. It is a schematic diagram showing an image of each LLRR frame and a crosstalk image at that time when a 3D image close to the white level is displayed on a background close to the black level. It is a schematic diagram which shows an example of the LPF process by this embodiment. It is a schematic diagram which shows the response of the liquid crystal in the upper end, the center, and the lower end when the background is close to the black level and a 3D image close to the white level is displayed. When the simple average LPF process with 11 taps is performed only on the first frame, each frame processing result with respect to the horizontal position of the screen is a characteristic diagram. It is a schematic diagram which shows the functional block of the image processing apparatus which concerns on this embodiment. It is a schematic diagram which shows the structure of a LPF process part.

  Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

The description will be made in the following order.
(1) System configuration example (2) Image display device configuration example (3) Double-write example according to this embodiment (4) Crosstalk generation example (5) LPF processing according to this embodiment (6) Image Configuration example of processing equipment

[(1) System configuration example]
FIG. 1 is a schematic diagram showing a configuration of a stereoscopic image display observation system according to an embodiment of the present invention. As shown in FIG. 1, the system according to the present embodiment includes an image display device 100 including an LCD and display image viewing glasses 200.

  For example, the image display device 100 alternately displays the right-eye image R and the left-eye image L for each field. The display image viewing glasses 200 are provided with a pair of liquid crystal shutters 200a and 200b in a portion corresponding to a lens. The liquid crystal shutters 200a and 200b alternately open and close in synchronization with image switching for each field of the image display device 100. That is, in the field where the right-eye image R is displayed on the image display device 100, the left-eye liquid crystal shutter 200b is in a closed state, and the right-eye liquid crystal shutter is in an open state 200a. In the field where the left-eye image L is displayed, the reverse operation is performed.

  By such an operation, only the right-eye image R is incident on the right eye of the user who views the image display device 100 wearing the viewing glasses 200, and only the left-eye image L is incident on the left eye. For this reason, the images for the right eye and the left eye are synthesized inside the viewer's eyes, and the image displayed on the image display device 100 is recognized three-dimensionally. The image display apparatus 100 can also display a normal two-dimensional image. In this case, switching between the right-eye image R and the left-eye image L is not performed.

[(2) Configuration Example of Image Display Device]
Next, the configuration of the image display apparatus 100 will be described. FIG. 2 is a block diagram illustrating a configuration of the image display apparatus 100. As shown in FIG. 2, the image display apparatus 100 includes a left / right video control unit 120, a shutter control unit 122, an emitter 124, a timing control unit 126, a backlight control unit 128, a gate driver 130, a data driver 132, and a liquid crystal display panel 134. Is provided. A backlight (surface light source) 136 is disposed behind the liquid crystal display panel 134.

  The liquid crystal display panel 134 includes a liquid crystal layer, a transparent electrode facing the liquid crystal layer, a color filter, and the like. The afterglow characteristic of the phosphor constituting the backlight is set to 4 ms or less. Moreover, the backlight 136 is comprised from LED etc. with a good afterglow characteristic.

  The left and right video signal control unit 120 receives a left and right video signal for displaying the right-eye image R and the left-eye image L. The left and right video signal control unit 120 alternately outputs left and right video signals in order to cause the liquid crystal display panel 134 to alternately display the right eye image R and the left eye image L. Further, since the left and right video signal control unit 120 performs writing twice, which will be described later, based on the input left and right video signals, two identical signals are consecutive for each of the right eye video signal and the left eye video signal. Convert to

  The timing controller 126 receives the right-eye video signal and the left-eye video signal converted by the left and right video signal controller 120. The timing control unit 126 converts the input right-eye video signal and left-eye video signal into signals to be input to the liquid crystal display panel 132, and generates pulse signals used for the operations of the gate driver 130 and the data driver 132. .

  The signal converted by the timing control unit 126 is input to each of the gate driver 130 and the data driver 132. The gate driver 130 and the data driver 132 receive the pulse signal generated by the timing control unit 126 and cause each pixel of the liquid crystal display panel 134 to emit light based on the input signal. As a result, an image is displayed on the liquid crystal display panel 134.

  In addition, the left and right video signal control unit 120 sends a timing signal indicating the switching timing of the right-eye video signal and the left-eye video signal converted so as to be continuous to the shutter control unit 122. The shutter control unit 122 sends a drive signal for causing the emitter 126 to emit light to the emitter 126 based on the timing signal sent from the left and right video signal control unit 120. The emitter 126 transmits an optical signal indicating the switching timing of the left and right video signals to the viewing glasses 200.

  Although not shown in detail, the display image viewing glasses 200 include a sensor that receives an optical signal. The viewing glasses 200 that have received the optical signal alternately perform opening / closing operations of the liquid crystal shutters 200a and 200b in synchronization with the switching timing of the right-eye video signal and the left-eye video signal of the image display device 100.

  The timing signal output from the shutter control unit 122 is input to the backlight control unit 128. The backlight control unit 128 outputs a control signal for turning on the backlight 136 based on the input timing signal. The backlight 136 is turned on based on a control signal input from the backlight control unit 128.

[(3) Example of writing twice according to this embodiment]
In order to eliminate occurrence of crosstalk due to insufficient response speed of the liquid crystal and insufficient luminance, in this embodiment, the drive frequency of the liquid crystal panel is increased and one frame of the left and right images is applied to the liquid crystal display panel 132 twice. A technique of displaying (writing) is adopted.

  FIG. 3 is a timing chart showing the principle of double writing according to the present embodiment and the opening and closing of the liquid crystal shutters 200a and 200b. Each of the right-eye image R and the left-eye image L is driven at a drive frequency of 240 [Hz]. The case where it displays is shown. In FIG. 3, the time for which the right-eye image R or the left-eye image L is displayed by one writing is 1/240 [Hz] = 4.2 [ms].

  FIG. 3 shows how the luminance changes with time at each position in the vertical direction from the lower end (H = 0) to the upper end (H = 1) of the liquid crystal display panel 132. In FIG. 3, the liquid crystal shutters 200a and 200b are opened for a predetermined time T.

  As shown in FIG. 3, at the upper end of the screen (H = 1), the right-eye image R is written during 4.2 [ms] from time t20 to t21, and subsequently 4.2 from time t21 to t22. The right-eye image R is written again during [ms]. Here, the right-eye image R written between time t20 and t21 and the right-eye image R written between time t21 and t22 are basically the same image, but adjustments such as overdrive processing are performed. It may be different due to. Further, a predetermined blank period may be provided between the right-eye image R written for the first time and the right-eye image R written for the second time.

  Then, after the right eye image R is written twice, the left eye image L is written. Also for the left-eye image L, at the upper end of the screen (H = 1), the left-eye image L is written during 4.2 [ms] from time t22 to t23, and subsequently 4.2 from time t23 to t24. The left-eye image L is written again during [ms]. The left-eye image L written between time t22 and t23 and the left-eye image L written between time t23 and t24 are basically the same image, but are caused by adjustments such as overdrive processing. May be different. Further, a predetermined blank period may be provided between the left-eye image L written for the first time and the left-eye image L written for the second time, or between the left-eye image L and the right-eye image R.

  In general, the response time of a liquid crystal display device is relatively slow. Therefore, if the writing time is short, each pixel does not reach a desired luminance. For this reason, when the drive frequency is increased and the right-eye image R and the left-eye image L are written alternately, the writing time for one time (= 4.2 ms) is shortened and the desired luminance is reached only after the first writing. Therefore, there is no timing when both the upper end and the lower end of the screen reach the desired luminance.

  In the present embodiment, the right-eye image R and the left-eye image L are written twice, so that the desired luminance can be maintained at the second writing time, and accordingly, the upper and lower edges of the screen. In both cases, it is possible to realize a state in which a desired luminance is reached.

  As described above, the data update in the liquid crystal display device is performed line-sequentially, and therefore the timing at which the lower end data is updated with respect to the timing at which the upper end data is updated has a shift of about one frame. On the other hand, the switching of the shutter glasses is performed on the entire surface. For example, in a configuration in which the frame rate of the liquid crystal display device is set to 120 Hz and L and R are switched, even if the response characteristic of the liquid crystal is ideally switched instantaneously, the upper and lower ends of the screen are the same at the same time. I can't hold my eye image. In this case, a so-called crosstalk phenomenon occurs in which the image of the other eye enters the eye whose shutter glasses are open. Crosstalk is particularly noticeable in high-contrast images. That is, when a bright object is present against a dark background, the other eye is easily recognized as a ghost image.

  When the writing is not performed twice as in the present embodiment, when the right-eye image R and the left-eye image L are alternately displayed at a low frequency at which the liquid crystal responds, flicker (screen flicker) ) Will occur. Flicker occurs when, for example, the drive frequency at which one frame of the right-eye image R or the left-eye image L is displayed is 60 [Hz] or less. In the present embodiment, since the driving frequency of the liquid crystal is, for example, 240 [Hz], occurrence of flicker can be reliably suppressed.

  The liquid crystal shutter is opened in, for example, sections T1 and T2 in FIG. In the section T1, the left-eye liquid crystal shutter 200b is closed, and the right-eye liquid crystal shutter 200a is opened. In the section T2, the right-eye liquid crystal shutter 200a is closed, and the left-eye liquid crystal shutter 200b is opened.

  In the display in the above-described double writing sequence, each of the left-eye image L and the right-eye image R is rewritten in the first frame, retained in the second frame, and at the timing of the second frame. The left-eye image L and the right-eye image R are separated by opening the shutters 200a and 200b.

  As described above, the liquid crystal panel generally rewrites data in a line-sequential manner from the upper end to the lower end of the screen. In that case, as shown in FIG. 3, the rewrite timing is delayed by one frame at the lower end compared to the upper end at the display frame rate. On the other hand, as shown in FIG. 3, the shutters 200a and 200b are opened and closed collectively.

For this reason, for example, as shown in FIG. 3, the shutter opening ratio is 25% (one frame period of each of the left-eye image L and the right-eye image R), and the opening timing is aligned with the center of the screen (FIG. 3). In the middle section T1), the rewriting of the first frame of the right-eye image R to be displayed next is started at the intermediate time of the shutter opening period at the upper end of the screen, and the left-eye image L until the intermediate time of the shutter opening period at the lower end of the screen. The previous frame data is held, and rewriting of the second frame of the left-eye image L starts at an intermediate time.
[(4) Crosstalk occurrence example]

  FIG. 4 shows the response characteristics of the liquid crystal with respect to the screen vertical position by approximating the response characteristics of the liquid crystal with an exponential function. In FIG. 4, the response characteristics at the screen vertical positions of H = 0, 0.2, 0.4, 0.6, 0.8, and 1 with the lower end of the screen vertical position being H = 0 and the upper end being H = 1. Is shown.

  FIG. 4 shows a case where a bright 3D object (luminance 0.7) is displayed on a dark background (luminance 0.2), and a left-eye image (luminance 0.2) and a right-eye image (luminance 0). .7) are displayed alternately. In FIG. 4, a section of time 0.5 to 1.5 on the horizontal axis corresponds to, for example, T1 in FIG. 3, and in this section, the shutter 200b is opened and the shutter 200a is closed.

  As shown in FIG. 4, the response timing becomes faster toward the upper side of the screen. At the timing when the shutter 200b is closed (time 1.5), the luminance is around 0.6 when the screen vertical position is H = 1. Has reached. On the other hand, in the characteristics where the vertical position of the screen is H = 0.4 and H = 0.6, the luminance is close to 0.2 at the timing when the shutter is closed. Accordingly, the left-eye image L having a luminance of 0.2 can be appropriately displayed at the position of H = 0.4 and H = 0.6 in the center of the screen, but the right-eye image R having a high luminance is displayed at the position of H = 1. It will be mixed.

  FIG. 5 shows a change in luminance with respect to the screen vertical position when integration is performed with the opening time of the shutter in the characteristics of FIG. As shown in FIG. 5, it can be seen that the integrated value of luminance increases as the screen vertical position approaches the upper end or the lower end, and the background gradation level (luminance 0.2) increases due to crosstalk.

  FIG. 6 shows an image of each LLRR frame and a crosstalk image at that time when a 3D image close to the white level is displayed on a background close to the black level. As shown in FIG. 6, when the image close to the white level has parallax on the left and right, the bright image and the dark image are alternately displayed as described in FIG. In such a case, if you open the shutter in alignment with the center of the screen, crosstalk occurs at the top and bottom of the screen, so a white level image is relatively clearly visible at the center of the screen, but the cross is at the top of the screen. Due to the occurrence of the talk, white portions W2 are visually recognized on both sides of the white level belt W1.

[(5) LPF processing according to this embodiment]
For this reason, in the present embodiment, in the display based on the LLRR sequence, the display image in the shutter opening period of other eyes is made inconspicuous by performing LPF processing around the edge of the image where LR crosstalk is conspicuous. .

First, conditions for conspicuous LR crosstalk will be described. Crosstalk occurs remarkably in the following cases.
(A) The parallax between the left and right images is large (b) The contrast is high (the luminance difference of the LR of the image of interest is large and the luminance of the background is low)
(C) The screen vertical position of the target pixel is deviated from the optimum timing position of the shutter opening.

  In the present embodiment, a condition where the crosstalk is conspicuous is detected, and the LPF process is appropriately performed only when the condition is satisfied. As a result, crosstalk can be reduced without degrading the original image quality.

  In the case of a liquid crystal display device, the processing result does not necessarily reflect instantaneously. In addition, when the shutter opening timing is aligned with the center of the screen, the upper frame is rewritten with the next frame information at the middle point of the shutter opening period, and the previous frame information is held at the lower end up to the middle point of the shutter opening period. For example, it is necessary to perform processing at an appropriate time.

  First, detection means for conditions in which crosstalk is conspicuous will be described. First, the means for discriminating the magnitude of parallax (a) will be described. The means for detecting the amount of parallax can detect the shift amount of the LR image using a known method such as block matching and define this as the amount of parallax.

  Next, the image (b) having a high contrast will be described. When the contrast is high, the amplitude of the luminance of LR at the target pixel increases. That is, the contrast intensity information can be the absolute value of the difference between the signal average values in the target pixel of each LR or in an appropriate region centered on the target pixel.

  Next, regarding the detection of the vertical position of the screen in (c) above, for example, the horizontal synchronization signal (Hsync) and the vertical synchronization signal (Vsync) are received, the horizontal synchronization signal is counted, and the vertical synchronization signal is reset. The vertical position of the screen can be detected.

  Next, the LPF process will be described. Since parallax occurs only in the left-right direction, a low-pass filter having an appropriate number of taps in the horizontal direction is used. Regarding the number of taps, it is possible to adopt a configuration in which filters with a plurality of taps are switched according to the parallax. Also, the number of taps that are particularly effective may be fixed. The LPF can be a simple average filter with a tap width. Also, a filter configuration with appropriate weights such as Gaussian can be used.

  Next, the relationship between the screen vertical position and the frame subjected to LPF processing will be described. When the shutter opening timing is optimized at the center of the screen vertical position, the information of the next frame is rewritten at the intermediate time of the shutter opening period at the upper end of the screen as described above. Since this information becomes a crosstalk component, it needs to be made inconspicuous by LPF processing. That is, it is appropriate to perform the LPF process on the first frame of each LR in the LLRR sequence at the upper end of the screen.

  On the other hand, the previous frame information is held at the lower end of the screen until the intermediate time of the shutter opening period. Since this information becomes a crosstalk component, it needs to be made inconspicuous by LPF processing. That is, it is appropriate to perform the LPF process on the second frame of each LR in the LLRR sequence at the lower end of the screen. Since the shutter opening timing is optimal at the center of the screen, it is desirable to make the LPF correction amount smaller than the upper end and lower end since the original display quality may be impaired by excessively applying LPF processing.

  FIG. 7 is a schematic diagram illustrating an example of the LPF processing according to the present embodiment, and the images of the first frame and the second frame, respectively, when a 3D image close to the white level is displayed with a gradation close to the black level. FIG. FIG. 8 schematically shows the response of the liquid crystal at the upper end, the center, and the lower end when a 3D image close to the white level is displayed with a gradation close to the black level.

  As shown in FIG. 7, at the upper end of the screen, the LPF processing gain of the first frame is increased and the LPF gain of the second frame is decreased. The response of the liquid crystal at the target pixel near the edge is reduced in amplitude in the first frame by performing LPF processing in the first frame. As a result, as shown in FIG. 8, the response characteristic curve of the liquid crystal has a slow phase and a gentle slope. Thereby, the characteristic curve at the upper end approximates the center response curve. The luminance of the shutter opening time integral value is less shifted from a predetermined luminance level, and crosstalk is reduced.

  At the lower end of the screen, the LPF processing gain of the second frame is increased and the LPF gain of the first frame is decreased. The response of the liquid crystal at the pixel of interest near the edge decreases the amplitude of the second frame by increasing the gain of LPF processing in the second frame. As a result, as shown in FIG. 8, the response characteristic curve of the liquid crystal has a gentle slope, and the characteristic curve at the lower end approximates the central response curve. The luminance of the shutter opening time integral value is less shifted from a predetermined luminance level, and crosstalk is reduced. As described above, the LPF process brings the upper and lower characteristic curve phases closer to the phase of the central characteristic curve, and the occurrence of crosstalk can be reliably suppressed by blurring the image on the screen.

  FIG. 9 shows a case where a simple average LPF process with 11 taps is applied to only the first frame, when a 3D image having an amplitude of 1, a width of 5 and a parallax amount of 10 is displayed on a background of gradation 0. Each frame processing result with respect to the horizontal position of the screen (corresponding to the upper end of the screen) In FIG. 9, the characteristic of L2 indicates the left eye image before the LPF process, and the characteristic of L1 indicates the left eye image after the LPF process. The characteristic R2 indicates the right-eye image before LPF processing, and the characteristic R1 indicates the right-eye image after LPF processing. As is clear from this result, by performing LPF processing with the same number of taps as the amount of parallax, LPF processing functions in a frame in which crosstalk is conspicuous, and crosstalk can be made inconspicuous.

[(6) Configuration example of image processing apparatus]
FIG. 10 is a schematic diagram showing functional blocks of the image processing apparatus 300 according to the present embodiment. The image processing apparatus 300 can be configured with the left and right video signal control unit 120 of FIG. Image storage units 302 and 304 that store LR input images, a parallax amount detection unit 306, a parallax amount gain calculation unit 308, a contrast gain calculation unit 310, a vertical position detection unit 312, a vertical position gain calculation unit 314, and an LLRR sequence An output image switching unit 316 and an LPF processing unit 320 are provided.

  The parallax amount detection unit 306 performs block matching on the LR images stored in the image storage units 302 and 304, detects the parallax amount at the target pixel, and outputs the parallax amount. The parallax amount gain calculation unit 308 calculates the gain by increasing the gain when the amount of parallax is large and decreasing the gain when the amount of parallax is small according to the amount of parallax, and outputs the calculated gain. The contrast gain calculation unit 310 calculates the gain by increasing the gain when the contrast is high and decreasing the gain when the contrast is low, using the LR difference value at the target pixel as the contrast evaluation value, and outputs the calculated gain.

  The vertical position detection unit 312 detects and outputs the vertical position of the target pixel. The vertical position gain calculation unit 314 calculates and outputs a gain whose gain is high at the upper end of the screen and monotonically decreases toward the lower end of the screen in the first frame according to the vertical position. In the second frame, the gain is high at the lower end of the screen, and the gain decreases monotonously toward the upper end of the screen. A gain pattern corresponding to the vertical position of the screen is stored in the LUT, and the first and second frames of the LUT are referred to in each frame.

  Note that the functional blocks shown in FIG. 10 can be configured by hardware (circuit) or a central processing unit such as a CPU and a program (software) for causing the central processing unit to function. When configured by a CPU and a program for causing it to function, the program can be stored in a recording medium such as a memory provided in the apparatus or a memory connected from the outside.

  FIG. 11 is a schematic diagram illustrating a configuration of the LPF processing unit 320. In the LPF processing unit 320, the image data converted into the LLRR sequence by the image switching unit 316 is input, and a plurality of LPFs 322 having different tap numbers are switched according to the amount of parallax. Further, the subtracting unit 324 subtracts the original data from the output of the LPF 322 to calculate the LPF processing correction amount for the target pixel. Then, the parallax gain, the contrast gain, and the vertical position gain are multiplied by the multipliers 326, 328, and 330 and added to the input value by the adder 332 to obtain an output value.

  The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field to which the present invention pertains can come up with various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that these also belong to the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 100 Image display apparatus 120 Left-right video signal control part 300 Image processing apparatus 306 Parallax amount detection part 310 Contrast gain calculation part 312 Vertical position detection part 320 LPF process part

Claims (12)

A signal control unit that receives an input of the image signal and converts the image for the right eye and the image for the left eye into a signal for displaying each image continuously at least twice;
A parallax detector that detects parallax between the right-eye image and the left-eye image;
An LPF processing unit that performs low-pass filtering on the right-eye image and the left-eye image based on the parallax amount;
An image processing apparatus comprising:   The image processing apparatus according to claim 1, wherein the LPF processing unit switches the number of taps of a low-pass filter according to the amount of parallax.   The LPF processing unit adds a correction amount by LPF processing to the original signals of the right-eye image and the left-eye image, and multiplies the correction amount by a gain that increases as the parallax amount increases. An image processing apparatus according to 1. A signal control unit that receives an input of the image signal and converts the image for the right eye and the image for the left eye into a signal for displaying each image continuously at least twice;
A contrast detection unit that detects the contrast between the right-eye image and the left-eye image;
An LPF processing unit that performs low-pass filtering on the right-eye image and the left-eye image based on the contrast;
An image processing apparatus comprising:   The LPF processing unit adds a correction amount by LPF processing to the original signals of the right-eye image and the left-eye image, and sets a gain that increases with an increase in an index value indicating the contrast size as the correction amount. The image processing apparatus according to claim 4, wherein multiplication is performed.   The image processing apparatus according to claim 5, wherein the contrast detection unit detects a difference value between signals of the left-eye image and the right-eye image at a target pixel as the index value. A signal control unit that receives an input of the image signal and converts the image for the right eye and the image for the left eye into a signal for displaying each image continuously at least twice;
A vertical position detector for detecting the vertical position of the image;
An LPF processing unit that performs low-pass filtering on the right-eye image and the left-eye image based on the vertical position;
An image processing apparatus comprising: The signal control unit converts each of the right-eye image and the left-eye image into a signal for continuously displaying twice,
The LPF processing unit multiplies the correction amount by the low-pass filtering process by a gain that increases from the upper part of the screen toward the lower part of the screen in the first frame of the right-eye image or the left-eye image that is continuous twice. 8. The image processing apparatus according to 7. The signal control unit converts each of the right-eye image and the left-eye image into a signal for continuously displaying twice,
The LPF processing unit multiplies the correction amount by the low-pass filtering process by a gain that increases from the lower part of the screen toward the upper part of the screen in the second frame of the right-eye image or the left-eye image that is continuous twice. 8. The image processing apparatus according to 7. Means for receiving an input of an image signal and converting each of the image for the right eye and the image for the left eye into a signal for displaying at least twice continuously;
Means for detecting parallax between the image for the right eye and the image for the left eye;
Means for performing low-pass filtering on the right-eye image and the left-eye image based on the parallax amount;
As a program to make the computer function. Means for receiving an input of an image signal and converting each of the image for the right eye and the image for the left eye into a signal for displaying at least twice continuously;
Means for detecting the contrast between the right-eye image and the left-eye image;
Means for performing low-pass filtering on the right-eye image and the left-eye image based on the contrast;
As a program to make the computer function. Means for receiving an input of an image signal and converting each of the image for the right eye and the image for the left eye into a signal for displaying at least twice continuously;
Means for detecting the vertical position of the image,
Means for performing low-pass filtering on the right-eye image and the left-eye image based on the vertical position;
As a program to make the computer function.

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