JP2008276084A - Display control device, method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display control device, method, and program capable of reducing blur of a moving image. <P>SOLUTION: A ΔΣ modulation part 32-1 performs pulse density modulation of an input signal of a moving image. A movement compensation part 51-1 of a frame interpolation part 34 performs motion compensation of each pulse of a pulse density modulated signal which is a signal of the moving image resulting from the pulse density modulation. The frame interpolation part 34 drives a display device 36 like an LCD or a PDP by the pulse density modulated signal of which each pulse has been subjected to the motion compensation. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a display control apparatus, method, and program, and more particularly, to a display control apparatus, method, and program that reduce motion blur.

  As the response speed of LCD (liquid crystal display) liquid crystal becomes faster, the hold time has attracted attention as a cause of motion blur.

  Figure 1 shows an image of an object whose brightness changes continuously from the left edge of 25% gray (75% brightness) to the right edge of 75% gray (25% brightness) from left to right. And it is a figure which shows the image recognized when a eyes | visual_axis follows it.

  In FIG. 1, the vertical direction indicates the time direction, and time elapses from the upper side to the lower side. In FIG. 1, the horizontal direction indicates the spatial direction.

  In an LCD that displays 60 frames per second, one image is displayed in units of 1/60 second, which is the time per frame.

  A dotted line in FIG. 1 indicates a viewpoint of a line of sight following an image of an object moving from left to right.

  As shown by A in FIG. 1, when attention is paid to the viewpoint toward the left end of the image of the object, an image in which the image at the left end and the background are mixed is recognized, and moving image blur occurs. Similarly, at the right end of the image of the object, an image in which the image at the right end of the object and the background are mixed is recognized, and moving image blur occurs.

  As shown in FIG. 2, the PDP (plasma display panel) determines whether or not light is emitted in each subframe having a length ranging from a power of 2 to a power of 2 (n is a positive integer). Since gradation is expressed by the light emission pattern, moving image blur is recognized by the light emission duration as in the case of the LCD.

  In FIG. 2, the vertical direction indicates the time direction, and time elapses from the upper side to the lower side. In FIG. 2, the horizontal direction indicates the spatial direction.

  In the PDP, as shown by B in FIG. 2, a pseudo contour is generated depending on the light emission pattern.

  Conventionally, the display period of one field is divided into N subfields, and only in the first subfield in a subfield group consisting of M (2 ≦ M ≦ N) continuously arranged. A discharge that initializes all the discharge cells to either the light-emitting cell or the non-light-emitting cell is generated, and the discharge cell is set to a non-light-emitting cell or a light-emitting cell in any one subfield of the subfield group. A first pixel data pulse that causes discharge to be set on one side is applied, and a second pixel data pulse that is the same as the pixel data pulse is applied to at least one of the existing sub-fields. In some cases, only the light emitting cells in the field emit light for the light emission period corresponding to the weight of the subfield (for example, If, see Patent Document 1).

JP 2000-231362 A

  However, the pseudo contour has been tried to be reduced by the method described in Patent Document 1 or other methods, but moving image blur cannot be reduced by such a method.

  In addition, there is a method of interpolating by predicting an intermediate frame from previous and subsequent frames to shorten an apparent hold time. According to this method, moving image blur is dramatically improved by increasing the number of frames to be interpolated.

  As shown in FIG. 3, if 480 frames are displayed per second, the moving image blur is dramatically reduced as indicated by C in FIG.

  However, it is very difficult to drive LCDs and PDPs at such a high frame rate. LCDs require high-speed D / A (digital to analog) converters and panel response speed. In the PDP, an image must be displayed with a further subdivided light emission pattern for a shorter time per frame.

  Therefore, such a method is not realistic.

  On the other hand, as shown in FIG. 4, it is conceivable to drive the display device with a pulse density modulation signal. However, it is not possible to reduce the motion blur as indicated by D in FIG. 4.

  3 and 4, the vertical direction indicates the time direction, and time elapses from the upper side to the lower side. 3 and 4, the horizontal direction indicates the spatial direction.

  The present invention has been made in view of such a situation, and makes it possible to reduce moving image blur.

  A display control apparatus according to an aspect of the present invention includes a first modulation unit that performs pulse density modulation on a moving image signal and a first pulse that performs motion compensation on each pulse of the pulse density modulation signal that is a pulse density modulated moving image signal. 1 motion compensation means.

  Driving means for driving the display device by the pulse density modulation signal in which each pulse is motion-compensated can be further provided.

  The first modulation means modulates the pulse density of the first frame signal of the moving image, and the first motion compensation means causes the pulse density of the first frame signal to be pulse density modulated. A second modulation unit that compensates motion of each pulse of the modulation signal and performs pulse density modulation on the second frame signal adjacent to the first frame, the second frame of the moving image; and the moving image And second motion compensation means for compensating motion of each pulse of the pulse density modulation signal obtained by pulse density modulation of the signal of the second frame of the image, and each of the pulses is motion compensated in the driving means. The display device is driven by the pulse density modulation signal in which the signal of the first frame is pulse density modulated and the pulse density modulation signal in which the signal of the second frame is pulse density modulated. It can be.

  The driving means is a pulse density modulation signal in which the signal of the first frame is subjected to pulse density modulation and each pulse is motion compensated, and from the time of the first frame to the next of the first frame The pulse density modulation signal arranged at the time until the time of the second frame includes the time from the time of the first frame to the time of the second frame, and the time of each pulse from the time of each pulse. A first weighting means for weighting a ratio to a time up to a time as a weight; and a pulse density modulation in which a signal of the second frame next to the first frame is subjected to pulse density modulation, and each pulse is motion compensated. A pulse density modulation signal arranged at a time from the time of the first frame to the time of the second frame is added to the second frame from the time of the first frame. Second weighting means for weighting the ratio of the time until the time of the first frame and the time from the time of the first frame to the time of each pulse as a weight, and the weighting of the first frame An adding means for adding a pulse density modulated signal obtained by pulse density modulation of the signal and a pulse density modulated signal obtained by pulse density modulating the signal of the second frame is provided. The display device can be driven.

  There may be further provided third modulation means for modulating the result of the addition in the driving means and supplying the result to the display device.

  The driving means includes a pulse density modulation signal in which the signal of the first frame is pulse density modulated and each pulse is motion compensated, and the next to the first frame from the time of the first frame. Each of the first subframes divided by a predetermined number from the time of the first frame to the time of the second frame in the pulse density modulation signal arranged at the time up to the time of the second frame Of the time of the ratio of the time from the time of each pulse to the time of the second frame to the time from the time of the first frame to the time of the second frame, A display device is driven, and a signal of the second frame subsequent to the first frame is pulse density modulated, and each pulse is a motion-compensated pulse density modulated signal, Driving the display device for each remaining time of the sub-frame with a pulse density modulation signal arranged from the time of the frame to the time of the second frame next to the first frame Can do.

  The display control method according to an aspect of the present invention includes a step of performing pulse density modulation on a moving image signal and performing motion compensation on each pulse of the pulse density modulation signal that is a pulse density modulated moving image signal.

  A program according to one aspect of the present invention causes a computer to perform processing including a step of performing pulse density modulation on a moving image signal and performing motion compensation on each pulse of the pulse density modulation signal that is a pulse density modulated moving image signal. .

  In one aspect of the present invention, a moving image signal is subjected to pulse density modulation, and each pulse of the pulse density modulation signal, which is a pulse density modulated moving image signal, is motion compensated.

  As described above, according to one aspect of the present invention, a moving image can be displayed.

  Also, according to one aspect of the present invention, it is possible to reduce moving image blur.

  Embodiments of the present invention will be described below. Correspondences between the configuration requirements of the present invention and the embodiments described in the detailed description of the present invention are exemplified as follows. This description is to confirm that the embodiments supporting the present invention are described in the detailed description of the invention. Accordingly, although there are embodiments that are described in the detailed description of the invention but are not described here as embodiments corresponding to the constituent elements of the present invention, It does not mean that the embodiment does not correspond to the configuration requirements. Conversely, even if an embodiment is described here as corresponding to a configuration requirement, that means that the embodiment does not correspond to a configuration requirement other than the configuration requirement. It's not something to do.

  The display control apparatus according to one aspect of the present invention includes a first modulation unit (for example, a ΔΣ modulation unit 32-1 in FIG. 6) that performs pulse density modulation on a moving image signal, and a moving image signal that has been pulse density modulated. 1st motion compensation means (for example, motion compensation part 51-1 of FIG. 6) which carries out motion compensation of each pulse of a certain pulse density modulation signal is provided.

  Driving means (for example, the frame interpolation unit 34 in FIG. 6) for driving the display device with the pulse density modulation signal in which each pulse is motion-compensated can be further provided.

  The first modulation means modulates the pulse density of the first frame signal of the moving image, and the first motion compensation means causes the pulse density of the first frame signal to be pulse density modulated. Each pulse of the modulation signal is motion-compensated, and second modulation means (for example, FIG. 2) that performs pulse density modulation on the signal of the second frame of the moving image that is adjacent to the first frame. 6 sigma-modulation unit 32-2) and second motion compensation means (for example, FIG. 6) that compensates motion of each pulse of the pulse density modulation signal in which the signal of the second frame of the moving image is pulse density modulated. The motion compensation unit 51-2) is further provided, and the driving means includes a pulse density modulation signal in which each pulse is subjected to motion compensation, the first frame signal is pulse density modulated, and the first 2 frame signal The display device can be driven by a pulse density modulation signal that has been pulse density modulated.

  The driving means is a pulse density modulation signal in which the signal of the first frame is subjected to pulse density modulation and each pulse is motion compensated, and from the time of the first frame to the next of the first frame The pulse density modulation signal arranged at the time until the time of the second frame includes the time from the time of the first frame to the time of the second frame, and the time of each pulse from the time of each pulse. First weighting means (for example, the multiplier 52-1 in FIG. 6) for weighting the ratio to the time up to the time as a weight, and the signal of the second frame next to the first frame is pulse density modulated. Each pulse is a motion-compensated pulse density modulation signal, and the pulse density modulation signal arranged at a time from the time of the first frame to the time of the second frame Second weighting means (for example, FIG. 6) weights the ratio between the time from the time of the frame to the time of the second frame and the time from the time of the first frame to the time of each pulse. A multiplier 52-2), a pulse density modulation signal in which the signal of the first frame is subjected to pulse density modulation, and a pulse density modulation signal in which the signal of the second frame is pulse density modulated. And adding means (for example, an adder 53 in FIG. 6), and the driving means can drive the display device according to the result of the addition.

  Third modulation means (for example, the ΔΣ modulation unit 35 in FIG. 6) that modulates the result of addition in the driving means and supplies the result to the display device can be further provided.

  The processing that the display control method or program according to one aspect of the present invention causes a computer to perform is a pulse density modulation of a moving image signal (for example, step S11 in FIG. 14), and a pulse that is a pulse density modulated moving image signal. It includes a step of motion compensation for each pulse of the density modulation signal (for example, step S13 in FIG. 14).

  FIG. 5 is a block diagram showing an example of the configuration of the display control apparatus according to the embodiment of the present invention. The display control apparatus of FIG. 1 includes a frame memory 11-1, a frame memory 11-2, a frame interpolation unit 12, and a ΔΣ modulation unit 13. The display control apparatus in FIG. 1 causes the display device 14 to display an image corresponding to an input moving image (input moving image) signal.

  A moving image (input moving image) signal input to the display control apparatus is supplied to the frame memory 11-1. For example, a so-called baseband moving image signal is input to the display control device.

  The frame memory 11-1 temporarily stores the input moving image signal in units of frames. The frame memory 11-1 supplies the stored frame signal of the moving image to the frame memory 11-2 and the frame interpolation unit 12.

  For example, the frame memory 11-1 stores a moving image frame signal input at a time per frame, and stores the moving image frame at a time per frame for the next frame. Are supplied to the frame memory 11-2 and the frame interpolation unit 12.

  For example, the moving image signal is an 8-bit signal per sample having a predetermined sampling frequency Fs, and the frame memory 11-1 is the 8-bit moving image frame signal per sample having the sampling frequency Fs. -2 and the frame interpolation unit 12.

  The frame memory 11-2 temporarily stores the frame signal of the moving image supplied from the frame memory 11-1 in units of frames. The frame memory 11-2 supplies the stored frame signal of the moving image to the frame interpolation unit 12.

  For example, the frame memory 11-2 stores the moving image frame signal supplied from the frame memory 11-1, and stores the moving image stored in the time per frame for the next (subsequent) frame. The image frame signal is supplied to the frame interpolation unit 12.

  That is, the frame memory 11-2 supplies the frame interpolation unit 12 with the signal of the frame immediately before the frame that the frame memory 11-1 supplies to the frame interpolation unit 12. The frame interpolation unit 12 is supplied with signals of adjacent frames.

  For example, the frame memory 11-2 supplies the frame interpolation unit 12 with a moving image frame signal of 8 bits per sample at the sampling frequency Fs.

  The frame interpolating unit 12 is arranged between the adjacent two frames from the moving image frame signal supplied from the frame memory 11-1 and the moving image frame signal supplied from the frame memory 11-2. Generated frames and interpolating the frames.

  For example, the frame interpolating unit 12 applies the linear operation to the pixel values of the pixels at the corresponding positions of the pixels of the two frames, and corresponds to the frames arranged between the two frames. The pixel value of the pixel is calculated. For example, the frame interpolation unit 12 performs linear calculation or nonlinear calculation on the pixel value of each pixel of two frames and the pixel value of the other frame at the position indicated by the motion vector from the pixel of one frame. Is applied to calculate the pixel value of the corresponding pixel in the frame arranged between the two frames.

  The frame interpolation unit 12 supplies the ΔΣ modulation unit 13 with an 8-bit per sample moving image signal in which a frame is interpolated.

  The ΔΣ modulation unit 13 generates a pulse density modulation signal by performing ΔΣ modulation on the moving image signal interpolated from the frame supplied from the frame interpolation unit 12. The ΔΣ modulator 13 drives the display device 14 with the generated pulse density modulation signal.

  For example, the ΔΣ modulator 13 controls the display device 14 with a pulse density modulation signal of 1 bit per sample at a sampling frequency nFs which is n (n is a positive integer) times the sampling frequency Fs of the input moving image signal. To drive.

  The display device 14 is an LCD, a PDP, or the like, and displays an image corresponding to the pulse density modulation signal by driving the ΔΣ modulation unit 13.

  Further, the display device may be configured by the frame memory 11-1, the frame memory 11-2, the frame interpolation unit 12, the ΔΣ modulation unit 13, and the display device 14.

  Next, another example of the configuration of the display control device will be described.

  FIG. 6 is a block diagram showing another example of the configuration of the display control apparatus according to the embodiment of the present invention. 6 includes a frame memory 31-1, a frame memory 31-2, a ΔΣ modulator 32-1, a ΔΣ modulator 32-2, a motion vector detector 33, a frame interpolator 34, and a ΔΣ modulator 35. Consists of. The display control apparatus in FIG. 6 causes the display device 36 to display an image corresponding to the input moving image (input moving image) signal.

  A moving image (input moving image) signal input to the display control apparatus is supplied to the frame memory 31-2. For example, a so-called baseband moving image signal of 8 bits per sample at the sampling frequency Fs is input to the display control device.

  The frame memory 31-2 temporarily stores the input moving image signal in units of frames. The frame memory 31-2 supplies the stored frame signal of the moving image to the frame memory 31-1, the ΔΣ modulation unit 32-2, and the motion vector detection unit 33.

  For example, the frame memory 31-2 stores a signal of one frame that is input at a time per frame among the frames of the moving image. Then, the frame memory 31-2 converts the stored moving image frame signal into the frame memory 31-1, the ΔΣ modulation unit 32-2, and the motion vector detection unit at the time per frame for the next frame. To the unit 33.

  For example, the frame memory 31-2 executes in parallel the storage of the input signal of one frame and the output of the stored moving image frame signal.

  More specifically, when a moving image signal consisting of 60 frames per second is input, the frame memory 31-2 receives the i-th frame signal input during 1/60 seconds. Remember. The frame memory 31-2 outputs the signal of the previous frame stored, that is, the (i-1) th frame, for 1/60 second.

  In the next 1/60 second, the frame memory 31-2 outputs the stored i-th frame signal and also stores the (i + 1) -th frame signal.

  For example, when the moving image signal is a signal of 8 bits per sample of the sampling frequency Fs, the frame memory 31-2 converts the moving image frame signal of 8 bits per sample of the sampling frequency Fs into the frame memory 31-. 1, supplied to the ΔΣ modulator 32-2 and the motion vector detector 33.

  The frame memory 31-1 is configured in the same manner as the frame memory 31-2, and temporarily stores a frame signal of a moving image supplied from the frame memory 31-2 in units of frames. The frame memory 31-1 supplies the stored video frame signal to the ΔΣ modulator 32-1 and the motion vector detector 33.

  For example, the frame memory 31-1 stores a frame signal of a moving image supplied from the frame memory 31-2 at a time per frame for one frame. Then, the frame memory 31-1 supplies the stored frame signal of the moving image to the ΔΣ modulation unit 32-1 and the motion vector detection unit 33 at the time per frame for the next frame.

  For example, the frame memory 31-1 executes in parallel the storage of the input signal of one frame and the output of the stored moving image frame signal.

  More specifically, when a moving image signal consisting of 60 frames per second is input, the frame memory 31-2 stores it for 1/60 second, which is the time per frame (i− 1) When outputting the signal of the 1st frame, the frame memory 31-1 stores the signal of the (i-1) th frame supplied from the frame memory 31-2 for 1/60 second. The frame memory 31-1 outputs the signal of the previous frame stored, that is, the (i-2) -th frame signal for 1/60 second.

  In the next 1/60 second, the frame memory 31-1 outputs the stored signal of the (i-1) th frame and the i-th frame supplied from the frame memory 31-2. Store the signal.

  That is, the frame memory 31-1 converts the signal of the frame immediately before the frame signal supplied by the frame memory 31-2 to the ΔΣ modulation unit 32-2 and the motion vector detection unit 33, It supplies to the vector detection part 33. Each of the signals of the adjacent frames is supplied to the ΔΣ modulation unit 32-1 and the ΔΣ modulation unit 32-2. The motion vector detection unit 33 is supplied with signals of adjacent frames.

  For example, when the moving image signal is a signal of 8 bits per sample of the sampling frequency Fs, the frame memory 31-1 converts the moving image frame signal of 8 bits per sample of the sampling frequency Fs into the ΔΣ modulator 32. −1 and the motion vector detection unit 33.

  The ΔΣ modulation unit 32-1 generates a pulse density modulation signal by performing ΔΣ modulation on the moving image signal of one frame supplied from the frame memory 31-1.

  For example, the ΔΣ modulation unit 32-1 has a frame memory 31 with a frequency (hereinafter, referred to as an oversampling frequency nFs) that is n (n is a positive integer) times the sampling frequency Fs of the input moving image signal. -1 is oversampled to generate a 1-bit pulse density modulation signal per sample with an oversampling frequency nFs.

  The ΔΣ modulation unit 32-1 supplies the generated pulse density modulation signal to the frame interpolation unit 34.

  The ΔΣ modulation unit 32-2 performs ΔΣ modulation on the moving image signal of one frame after the frame that is supplied from the frame memory 31-2 and is ΔΣ-modulated by the ΔΣ modulation unit 32-1. A pulse density modulation signal is generated. In other words, the ΔΣ modulation unit 32-2 performs ΔΣ modulation on the moving image signal of the frame next to the frame that is ΔΣ-modulated by the ΔΣ modulation unit 32-1.

  For example, the ΔΣ modulator 32-2 oversamples the moving image signal supplied from the frame memory 31-2 at the oversampling frequency nFs to generate a 1-bit pulse density modulation signal per sample.

  The ΔΣ modulation unit 32-2 supplies the generated pulse density modulation signal to the frame interpolation unit 34.

  As described above, the pulse density modulation signal generated in the ΔΣ modulation unit 32-1 or the ΔΣ modulation unit 32-2 is 1 bit per sample, and the signal level at the density of the 1-bit pulse in the pulse density modulation signal. (Pixel brightness) is expressed.

  That is, each of the ΔΣ modulation unit 32-1 and the ΔΣ modulation unit 32-2 generates a pulse density modulation signal composed of pulses having a reference time interval of 1 / nFs seconds.

  The motion vector detection unit 33 is a motion vector indicating the motion of an image from a frame signal supplied from the frame memory 31-1 and a frame signal supplied from the frame memory 31-2, which are adjacent frame signals. Is detected.

  For example, the motion vector detection unit 33 detects a motion vector by a method such as block matching or a gradient method.

  The motion vector detection unit 33 supplies the detected motion vector to the frame interpolation unit 34.

  The frame interpolation unit 34 performs motion compensation on each pulse of the pulse density modulation signal supplied from the ΔΣ modulation unit 32-1, and performs motion compensation on each pulse of the pulse density modulation signal supplied from the ΔΣ modulation unit 32-2. Then, the frame interpolation unit 34 drives the display device 36 with a pulse density modulation signal in which each pulse is motion-compensated.

  The frame interpolation unit 34 includes a motion compensation unit 51-1, a motion compensation unit 51-2, a multiplier 52-1, a multiplier 52-2, and an adder 53.

  The motion compensation unit 51-1 performs motion compensation on each pulse of the pulse density modulation signal supplied from the ΔΣ modulation unit 32-1 according to the motion vector supplied from the motion vector detection unit 33. The motion compensation unit 51-2 performs motion compensation on each pulse of the pulse density modulation signal supplied from the ΔΣ modulation unit 32-2 according to the motion vector supplied from the motion vector detection unit 33.

  Hereinafter, when there is no need to distinguish between the motion compensation unit 51-1 and the motion compensation unit 51-2, they are simply referred to as the motion compensation unit 51.

  Here, the motion compensation of each pulse of the pulse density modulation signal by the motion compensation unit 51 will be described with reference to FIGS. 7 to 9, the vertical direction indicates the time direction, and time elapses from the upper side to the lower side. 7 to 9, the horizontal direction indicates the spatial direction.

  7 to 9, each vertical one-dot chain line indicates one pixel, and each horizontal one-dot chain line indicates a reference time of each pulse of the pulse density modulation signal. The reference time interval of each pulse of the pulse density modulation signal is (1 / oversampling frequency nFs) seconds.

  FIG. 7 is a diagram illustrating an example of a pulse density modulation signal supplied to the motion compensation unit 51.

The pulse density modulation signal indicating the pixel value of the pixel indicated by A shown in FIG. 7 includes a pulse a ₁ , a pulse a ₂ , a pulse a ₃ , a pulse a ₄ , a pulse a ₅ , and a pulse a _{6 in the} time direction. , Pulse a ₇ , pulse a ₈ , and pulse a ₉ are arranged.

  Since the pulse density modulation signal indicates the signal value according to the pulse density, the pulse interval in the pulse density modulation signal is (1 / oversampling frequency nFs) seconds, that is, spreads or narrows in units of the reference time. I'll be relaxed.

In the example shown in FIG. 7, the interval between the pulse a ₁ and the pulse a ₂ is 2 / nFs second, the interval between the pulse a ₂ and the pulse a ₃ is 1 / nFs second, and the pulse a ₃ and the pulse a ₃ distance between a ₄ is a 3 / NFS seconds, the interval between the pulses a ₄ and pulse a ₅ is 1 / NFS sec. Similarly, the interval between the pulse a ₅ and the pulse a ₆ is 1 / nFs second, the interval between the pulse a ₆ and the pulse a ₇ is 2 / nFs second, and the interval between the pulse a ₇ and the pulse a ₈ is The interval is 1 / nFs seconds, and the interval between the pulse a ₈ and the pulse a ₉ is 2 / nFs seconds.

In the pulse density modulation signal indicating the pixel value of the pixel indicated by B immediately to the right of the pixel indicated by A shown in FIG. 7, in the time direction, pulse b ₁ , pulse b ₂ , pulse b ₃ , pulse b ₄ , pulse b ₅ , pulse b ₆ , pulse b ₇ , pulse b ₈ , and pulse b ₉ are arranged.

In the example shown in FIG. 7, the pulse b ₁ is arranged at the same reference time as the pulse a ₁ . The interval between pulse b ₁ and pulse b ₂ is 1 / nFs second, the interval between pulse b ₂ and pulse b ₃ is 1 / nFs second, and the interval between pulse b ₃ and pulse b ₄ is a 2 / NFS seconds, interval between pulses b ₄ and the pulse b ₅ is 1 / NFS sec. Similarly, the interval between the pulse b ₅ and the pulse b ₆ is 2 / nFs second, the interval between the pulse b ₆ and the pulse b ₇ is 2 / nFs second, and the interval between the pulse b ₇ and the pulse b ₈ is The interval is 2 / nFs seconds, and the interval between the pulse b ₈ and the pulse b ₉ is 1 / nFs seconds.

In the pulse density modulation signal indicating the pixel value of the pixel indicated by C immediately to the right of the pixel indicated by B shown in FIG. 7, in the time direction, pulse c ₁ , pulse c ₂ , pulse c ₃ , pulse c ₄ , pulse c ₅ , pulse c ₆ , pulse c ₇ , pulse c ₈ , and pulse c ₉ are arranged.

In the example shown in FIG. 7, the pulse c ₁ is arranged at the same reference time as the pulse a ₁ . Interval between pulses c ₁ and the pulse c ₂ is a 2 / NFS seconds, interval between pulses c ₂ and the pulse c ₃ is a 2 / NFS seconds, the interval between pulses c ₃ and the pulse c _4, a 2 / NFS seconds, interval between pulses c ₄ and the pulse c ₅ is a 2 / NFS seconds. Similarly, the interval between the pulse c ₅ and the pulse c ₆ is 1 / NFS second, interval between pulses c ₆ and the pulse c ₇ is 1 / NFS sec, the pulse c ₇ and pulse c ₈ interval is a 2 / NFS seconds, interval between pulses c ₈ and the pulse c ₉ is 1 / NFS sec.

  8 and 9 are diagrams for explaining motion compensation of each pulse of the pulse density modulation signal according to the motion vector.

  For example, as shown in FIG. 8, the motion compensation unit 51 tilts the pulse density modulation signal in the spatial direction according to the gradient of the motion vector.

  Specifically, the motion compensation unit 51 obtains the inclination of the motion vector represented by the pulse (time direction) interval and the pixel (space direction) interval in the pulse density modulation signal from the motion vector. . For example, when a moving image is composed of 60 frames per second, when a motion vector indicating motion between two adjacent frames indicates motion of 10 pixels and an oversampling frequency nFs is 6000 Hz, 10 / ( 6000/60), the inclination of the motion vector is 0.1 pixel per pulse interval in the pulse density modulation signal.

  Then, the motion compensation unit 51 tilts the pulse density modulation signal by the determined motion vector tilt with reference to the frame time.

For example, as shown in FIG. 8, when the motion vector is tilted to the right by one pixel per 6 / nFs, the reference time of the pulse a ₁ , the pulse b ₁ , and the pulse c _{1 is} the time of the frame At this time, the motion compensation unit 51 converts the pulse density modulation signal indicating the pixel value of the pixel A, the pulse density modulation signal indicating the pixel value of the pixel B, and the pulse density modulation signal indicating the pixel value of the pixel C to the pulse a The reference time of ₁ , pulse b ₁ , and pulse c ₁ is tilted to the right by 1 pixel per 6 / nFs.

  Then, the motion compensation unit 51 shapes the tilted pulse density modulation signal with reference to each pixel and the reference time of each pulse of the pulse density modulation signal. That is, each pulse of the tilted pulse density modulation signal is arranged at the nearest pixel and the reference time.

As a result, for example, as shown in FIG. 8 and FIG. 9, the pulse density modulation signal indicating the pixel value of the original pixel A, and the pulse a ₁ and the pulse a ₂ of the tilted pulse density modulation signal are Since it is closest to the pixel A, the pulse of the pulse density modulation signal of the pixel A is used.

The pulse density modulation signal indicating the pixel value of the original pixel A, and the pulses a _{3 to} a ₆ of the tilted pulse density modulation signal are closest to the pixel B, so the pulse of the pulse density modulation signal of the pixel B It is said.

The pulse density modulation signal indicating the pixel value of the original pixel A, and the pulses a _{7 to} a ₉ of the tilted pulse density modulation signal are closest to the pixel C, so the pulse of the pulse density modulation signal of the pixel C It is said.

Also, for example, as shown in FIGS. 8 and 9, the pulse density modulation signal indicating the pixel value of the original pixel B, and the pulses b _{1 to} b ₃ of the tilted pulse density modulation signal are pixels Since it is closest to B, it is regarded as a pulse of the pulse density modulation signal of the pixel B.

The pulse density modulation signal indicating the pixel value of the original pixel B, and the pulses b _{4 to} b ₆ of the tilted pulse density modulation signal are closest to the pixel C, so the pulse of the pulse density modulation signal of the pixel C It is said.

The pulse density modulation signal indicating the pixel value of the original pixel B, and the pulses b _{7 to} b ₉ of the tilted pulse density modulation signal are closest to the pixel D on the right side of the pixel C, so A pulse of the pulse density modulation signal is used.

Further, for example, as shown in FIGS. 8 and 9, the pulse density modulation signal indicating the pixel value of the original pixel C, and the pulse c ₁ and the pulse c ₂ of the tilted pulse density modulation signal are pixels Since it is closest to C, it is regarded as a pulse of the pulse density modulation signal of the pixel C.

The pulse density modulation signal indicating the pixel value of the original pixel C, and the pulses c _{3 to} c ₅ of the tilted pulse density modulation signal are closest to the pixel D, so the pulse of the pulse density modulation signal of the pixel D It is said.

The pulse density modulation signal indicating the pixel value of the original pixel C, and the pulses c _{6 to} c ₉ of the tilted pulse density modulation signal are closest to the pixel E on the right side of the pixel D. A pulse of the pulse density modulation signal is used.

As a result, as shown in FIG. 9, in the pulse density modulation signal indicating the pixel value of the pixel A, the pulse a ₁ and the pulse a ₂ are arranged in the time direction, and the interval between the pulse a ₁ and the pulse a ₂ Is 2 / nFs seconds.

In the pulse density modulation signal indicating the pixel value of the pixel B, a pulse b ₁ , a pulse b ₂ , a pulse b ₃ , a pulse a ₃ , a pulse a ₄ , a pulse a ₅ , and a pulse a ₆ are arranged in the time direction. Is done.

The pulse b ₁ is arranged at the same reference time as the pulse a ₁ .

The interval between the pulse b ₁ and the pulse b ₂ is 1 / nFs second, the interval between the pulse b ₂ and the pulse b ₃ is 1 / nFs second, and the interval between the pulse b ₃ and the pulse a ₃ is 1 / nFs second. becomes NFS seconds, the interval between the pulses a ₃ and pulse a ₄ becomes 3 / NFS sec. Further, the interval between the pulse a ₄ and the pulse a ₅ is 1 / nFs second, and the interval between the pulse a ₅ and the pulse a ₆ is 1 / nFs second.

The pulse density modulation signal indicating the pixel value of the pixel C includes a pulse c ₁ , a pulse c ₂ , a pulse b ₄ , a pulse b ₅ , a pulse b ₆ , a pulse a ₇ , a pulse a ₈ , and a pulse a _{9 in the time direction.} Is placed.

The pulse c ₁ is arranged at the same reference time as the pulse a ₁ .

The interval between pulse c ₁ and pulse c ₂ is 2 / nFs second, the interval between pulse c ₂ and pulse b ₄ is 2 / nFs second, and the interval between pulse b ₄ and pulse b ₅ is 1 / n It becomes NFS seconds, interval between pulses b ₅ and the pulse b ₆ becomes 2 / NFS sec. Further, the interval between the pulse b ₆ and the pulse a ₇ is 3 / nFs second, the interval between the pulse a ₇ and the pulse a ₈ is 1 / nFs second, and the interval between the pulse a ₈ and the pulse a ₉ is 2 / nFs seconds.

In the pulse density modulation signal indicating the pixel value of the pixel D, a pulse c ₃ , a pulse c ₄ , a pulse c ₅ , a pulse b ₇ , a pulse b ₈ , and a pulse b ₉ are arranged in the time direction.

Pulse c ₃ are located on the same reference time as the pulse b _4.

The interval between pulse c ₃ and pulse c ₄ is 2 / nFs seconds, the interval between pulse c ₄ and pulse c ₅ is 2 / nFs seconds, and the interval between pulse c ₅ and pulse b ₇ is 1 / n It becomes NFS seconds, interval between pulses b ₇ and the pulse b ₈ becomes 2 / NFS sec. Further, the interval between the pulse b ₈ and the pulse b ₉ is 1 / nFs second.

In the pulse density modulation signal indicating the pixel value of the pixel E, a pulse c ₆ , a pulse c ₇ , a pulse c ₈ , and a pulse c ₉ are arranged in the time direction.

Pulse c ₆ are located on the same reference time as the pulse b _7.

The interval between pulse c ₆ and pulse c ₇ is 1 / nFs second, the interval between pulse c ₇ and pulse c ₈ is 2 / nFs second, and the interval between pulse c ₈ and pulse c ₉ is 1 / nFs second. nFs seconds.

  In this way, the motion compensation unit 51-1 performs motion compensation on each pulse of the pulse density modulation signal supplied from the ΔΣ modulation unit 32-1 according to the motion vector supplied from the motion vector detection unit 33. In addition, the motion compensation unit 51-2 performs motion compensation on each pulse of the pulse density modulation signal supplied from the ΔΣ modulation unit 32-2 according to the motion vector supplied from the motion vector detection unit 33.

  As shown in FIG. 10, the ΔΣ modulator 32-1 and the ΔΣ modulator 32-2 perform pulse density modulation on the frame signal output from the frame memory 31-1 at the same timing. -2 pulse-modulate the signal of the frame output from -2.

  Hereinafter, the frame of the moving image indicated by the signal output from the frame memory 31-1 is referred to as frame 1, and the frame of the moving image indicated by the signal output from the frame memory 31-2 is referred to as frame 2. Frame 2 is the next frame after frame 1.

  That is, at the same time, ΔΣ modulation section 32-1 and ΔΣ modulation section 32-2 start pulse density modulation of the signal of frame 1 and start pulse density modulation of the signal of frame 2, respectively. At the same time, the ΔΣ modulation unit 32-1 and the ΔΣ modulation unit 32-2 respectively end the pulse density modulation of the frame 1 signal and end the pulse density modulation of the frame 2 signal.

  Considering the arrangement of frames in a moving image, each of the ΔΣ modulation unit 32-1 and the ΔΣ modulation unit 32-2 performs pulse density modulation on the frames arranged one by one.

  Here, focusing on the time of the frame (the first time of the frame), the start and end times of pulse density modulation in the ΔΣ modulation unit 32-1 and the ΔΣ modulation unit 32-2 are expressed.

  The time at which the frame signal is supplied from the frame memory 31-1 (the time at which the supply is started) is expressed as the time of the frame. That is, the time at which the frame 1 signal is supplied from the frame memory 31-1 is referred to as frame 1 time, and the time at which the frame 2 signal is supplied from the frame memory 31-1 is referred to as frame 2 time.

  Thus, paying attention to the time of frame 1 and the time of frame 2, the start and end times of pulse density modulation in the ΔΣ modulation unit 32-1 and ΔΣ modulation unit 32-2 are changed to the time of frame 1 and the time of frame 2. It can be expressed by time.

  At the time of frame 1, ΔΣ modulation section 32-1 and ΔΣ modulation section 32-2 start pulse density modulation of the signal of frame 1, start pulse density modulation of the signal of frame 2, and At the time, it can be said that the ΔΣ modulation unit 32-1 and the ΔΣ modulation unit 32-2 respectively end the pulse density modulation of the signal of the frame 1 and end the pulse density modulation of the signal of the frame 2.

  The ΔΣ modulation unit 32-1 performs pulse density modulation on the signal of frame 1 to a pulse density modulation signal arranged at the time from the time of frame 1 to the time of frame 2, and the ΔΣ modulation unit 32- 2 pulse-modulates the signal of frame 2 into a pulse density modulation signal arranged at the time from the time of frame 1 to the time of frame 2.

  In other words, the pulse density modulation signal obtained by the pulse density modulation by the ΔΣ modulation unit 32-1 from the signal of frame 1 is arranged at the time from the time of frame 1 to the time of frame 2. Further, the pulse density modulation signal obtained by the pulse density modulation by the ΔΣ modulation unit 32-2 from the signal of frame 2 is arranged at the time from the time of frame 1 to the time of frame 2.

  Therefore, the motion compensation unit 51-1 performs motion compensation on each pulse of the pulse density modulation signal that is arranged at the time from the time of frame 1 to the time of frame 2 and in which the signal of frame 1 is pulse density modulated. In addition, the motion compensation unit 51-2 performs motion compensation on each pulse of the pulse density modulation signal, which is arranged at the time from the time of frame 1 to the time of frame 2 and in which the signal of frame 2 is subjected to pulse density modulation.

  As shown in FIG. 10, the motion compensation unit 51-1 is arranged at the time from the time of frame 1 to the time of frame 2, and each of the pulse density modulation signals in which the signal of frame 1 is pulse density modulated. The pulse is motion-compensated according to a motion vector indicating a motion toward frame 2 with reference to frame 1. In addition, the motion compensation unit 51-2 converts each pulse of the pulse density modulation signal, which is arranged at the time from the time of frame 1 to the time of frame 2 and in which the signal of frame 2 is subjected to pulse density modulation, to frame 2 Motion compensation is performed according to a motion vector indicating motion from frame 1 as a reference.

  As described above, the motion compensation unit 51-1 is a pulse density modulation signal in which the signal of frame 1 is subjected to pulse density modulation, and each pulse is motion compensated, and at the time from the time of frame 1 to the time of frame 2. The arranged pulse density modulation signal is output. The motion compensation unit 51-2 is a pulse density modulation signal in which the signal of frame 2 is pulse density modulated and each pulse is motion compensated, and is arranged at the time from the time of frame 1 to the time of frame 2. The pulse density modulation signal is output.

  The motion compensation unit 51-1 supplies a pulse density modulation signal obtained by motion compensation of each pulse to the multiplier 52-1. In addition, the motion compensation unit 51-2 supplies a pulse density modulation signal obtained by motion compensation of each pulse to the multiplier 52-2.

  The multiplier 52-1 multiplies each pulse of the pulse density modulation signal supplied from the motion compensation unit 51-1 by a weight α. The multiplier 52-1 multiplies each bit by a weight α using each pulse of the pulse density modulation signal supplied from the motion compensation unit 51-1 as a bit.

  For example, the multiplier 52-1 is a pulse density modulation signal in which the signal of frame 1 is pulse density modulated and each pulse is motion compensated, and is arranged at the time from the time of frame 1 to the time of frame 2. The pulse density modulation signal is weighted with a ratio α between the time from the time of frame 1 to the time of frame 2 and the time from the time of each pulse to the time of frame 2 as a weight α.

  The multiplier 52-1 supplies a pulse density modulation signal obtained by multiplying each pulse (bit) by the weight α to the adder 53.

  The multiplier 52-2 multiplies each pulse of the pulse density modulation signal supplied from the motion compensation unit 51-2 by a weight (1-α). The multiplier 52-2 multiplies each bit by a weight (1-α) using each pulse of the pulse density modulation signal supplied from the motion compensation unit 51-2 as a bit.

  For example, the multiplier 52-2 is a pulse density modulation signal in which the signal of frame 2 is subjected to pulse density modulation, and each pulse is motion compensated, and is arranged at the time from the time of frame 1 to the time of frame 2 The pulse density modulation signal is weighted with a ratio (1-α) between the time from the time of frame 1 to the time of frame 2 and the time from the time of frame 1 to the time of each pulse.

  The multiplier 52-2 supplies a pulse density modulation signal obtained by multiplying each pulse (bit) by the weight (1-α) to the adder 53.

  The adder 53 adds the pulse density modulation signal from the multiplier 52-1 and the pulse density modulation signal from the multiplier 52-2. That is, the adder 53 adds the weighted pulse density modulation signal obtained by performing pulse density modulation on the frame 1 signal and the pulse density modulation signal obtained by performing pulse density modulation on the frame 2 signal.

  Specifically, for example, the adder 53 includes a pulse density modulation signal obtained by multiplying each bit by a weight α from the multiplier 52-1, and a weight (1-) for each bit from the multiplier 52-2. The pulse density modulation signal multiplied by α) is added so as to add bits of the same pixel and the same reference time.

  The adder 53 outputs a signal obtained as a result of the addition.

  As described above, the frame interpolation unit 34 performs motion compensation on each pulse of the pulse density modulation signal supplied from the ΔΣ modulation unit 32-1, and applies each pulse of the pulse density modulation signal supplied from the ΔΣ modulation unit 32-2. Compensate for motion. The frame interpolation unit 34 weights each pulse density modulation signal, adds the weighted pulse density modulation signal, and outputs the result.

  Note that the pulse density depends on the weight of the ratio between the time from the time of frame 1 to the time of frame 2 and the time from the time of frame 1 to the time of each pulse or the time from the time of each pulse to the time of frame 2 Although it has been described that the modulation signal is weighted, the present invention is not limited to this, and even if weighting is performed using a predetermined weight or a weight determined according to a motion vector, the time from frame 1 to the time of frame 2 May be divided into a predetermined number of periods and weighted by a weight determined according to the period.

  The ΔΣ modulation unit 35 generates a pulse density modulation signal by performing ΔΣ modulation on the signal supplied from the frame interpolation unit 34. The ΔΣ modulator 35 supplies the generated pulse density modulation signal to the display device 36.

  For example, the ΔΣ modulation unit 35 modulates the signal supplied from the frame interpolation unit 34 into a 1-bit pulse density modulation signal per sample at the oversampling frequency nFs.

  The display device 36 is an LCD or a PDP, and displays an image according to the pulse density modulation signal by driving the frame interpolation unit 34 (ΔΣ modulation unit 35).

  For example, when the display device 36 that is an LCD is driven, the pulse density modulation signal is applied to the signal line of the display device 36 among so-called scanning lines and signal lines.

  For example, when the display device 36 that is a PDP is driven, the pulse density modulation signal is applied to the display device 36 as a signal for maintaining light emission in the light emitting cell.

  In addition, when the display device 36 which is a PDP is driven, the intensity of light emitted from each light emitting cell is changed depending on the pulse density of the pulse density modulation signal, and so-called address discharge is performed for all the cells. The length of each subframe in one frame is the same. In other words, the length of each subframe in one frame is fixed regardless of the ratio of the power of 2 to the power of 2 (n is a positive integer).

  As shown in FIG. 11, the pulses of the pulse density modulation signal that drives the display device 36 are arranged in accordance with the movement substantially linearly in the time direction and the spatial direction regardless of the time per frame. Will be.

  In FIG. 11, the vertical direction indicates the time direction, and time elapses from the upper side to the lower side. In FIG. 11, the horizontal direction indicates the spatial direction.

  As indicated by E in FIG. 11, the image of the moving object is not mixed with the background, and moving image blur does not occur.

  When the display device 36 is an LCD, as illustrated in FIG. 12, the moving image blur is generated depending only on the response speed of the liquid crystal of the display device 36.

  Note that the response speed when changing between white and black of the liquid crystal of the LCD is faster than when changing in halftone, so pulse density modulation consisting of pulses changing between white and black When driven by a signal, the liquid crystal on the LCD reacts faster.

  FIG. 13 is a diagram for explaining moving image blur in fixed vision.

  As described above, each pulse of the pulse density modulation signal for each pixel corresponding to the input image signal is motion-compensated, and the pulse density modulation signal is inclined in the spatial direction, that is, the display device 36. It is used to drive a plurality of pixels.

  As indicated by a one-dot chain line in FIG. 13, each pixel of the display device 36 is driven by a plurality of motion-compensated pulse density modulation signals.

  In fixed vision with the viewpoint fixed with respect to the display screen of the display device 36, the direction in which the pulses for driving the pixels of the display device 36 that determine the shade of each pixel of the display device 36 are arranged, and the visual Since the direction of integration is the same, the gradation of the image is correctly reproduced.

  The frame memory 31-1, the frame memory 31-2, the ΔΣ modulation unit 32-1, the ΔΣ modulation unit 32-2, the motion vector detection unit 33, the frame interpolation unit 34, the ΔΣ modulation unit 35, and the display device 36, You may make it comprise a display apparatus.

  FIG. 14 is a flowchart illustrating an example of display processing. In step S <b> 11, the ΔΣ modulation unit 32-2 acquires the forward referenced frame from the frame memory 31-2 and ΔΣ modulates the acquired frame.

  In step S <b> 12, the ΔΣ modulation unit 32-1 acquires a backward referenced frame from the frame memory 31-1 and ΔΣ modulates the acquired frame.

  In step S <b> 13, the motion compensation unit 51-2 of the frame interpolation unit 34 obtains a pulse density modulation signal obtained by ΔΣ modulation of the frame referred to in front according to the motion vector supplied from the motion vector detection unit 33. Motion compensation for each pulse of.

  In step S14, the multiplier 52-2 of the frame interpolation unit 34 weights each pulse of the motion-compensated pulse density modulation signal in the forward referenced frame. That is, in step S14, the multiplier 52-2 weights each bit by using each pulse of the motion-compensated pulse density modulation signal of the preceding frame to be referenced as a bit.

  In step S <b> 15, the motion compensation unit 51-1 of the frame interpolation unit 34 obtains a pulse density modulation signal obtained by performing ΔΣ modulation on the backward referenced frame in accordance with the motion vector supplied from the motion vector detection unit 33. Motion compensation for each pulse of.

  In step S <b> 16, the multiplier 52-1 of the frame interpolation unit 34 weights each pulse of the motion compensated pulse density modulation signal in the later referenced frame. That is, in step S16, the multiplier 52-1 weights each bit by using each pulse of the motion-compensated pulse density modulation signal of the backward referenced frame as a bit.

  In step S <b> 17, the adder 53 of the frame interpolation unit 34 adds the weight of the forward referenced frame and the backward referenced frame bit that are weighted respectively.

  In step S <b> 18, the ΔΣ modulation unit 35 performs ΔΣ modulation on the addition result in the adder 53. In step S19, the display device 36 is driven by a signal obtained by ΔΣ modulation of the addition result, and the procedure returns to step S11 and repeats the above-described processing.

  Thus, the moving image blur of the image displayed on the display device 36 can be further reduced.

  FIG. 15 is a block diagram showing still another example of the configuration of the display control apparatus according to the embodiment of the present invention. 15 includes a frame memory 71-1, a frame memory 71-2, a ΔΣ modulation unit 72-1, a ΔΣ modulation unit 72-2, a motion vector detection unit 73, a frame interpolation unit 74, and a switch 75. . The display control device in FIG. 15 causes the display device 76 to display an image corresponding to the input moving image (input moving image) signal.

  A moving image (input moving image) signal input to the display control apparatus is supplied to the frame memory 71-2. For example, a so-called baseband moving image signal of 8 bits per sample at the sampling frequency Fs is input to the display control device.

  The frame memory 71-2 is configured in the same manner as the frame memory 31-2, and temporarily stores the input moving image signal in units of frames. The frame memory 71-2 supplies the stored frame signal of the moving image to the frame memory 71-1, the ΔΣ modulation unit 72-2, and the motion vector detection unit 73.

  The frame memory 71-1 is configured in the same manner as the frame memory 31-1, and temporarily stores the frame signal of the moving image supplied from the frame memory 71-2 in units of frames. The frame memory 71-1 supplies the stored frame signal of the moving image to the ΔΣ modulation unit 72-1 and the motion vector detection unit 73.

  The ΔΣ modulation unit 72-1 is configured in the same manner as the ΔΣ modulation unit 32-1, and the pulse density modulation signal is obtained by performing ΔΣ modulation on the moving image signal of one frame supplied from the frame memory 71-1. Generate. The ΔΣ modulation unit 72-1 supplies the generated pulse density modulation signal to the frame interpolation unit 74.

  For example, the ΔΣ modulation unit 72-1 performs oversampling of the 8-bit moving image frame signal per sample of the sampling frequency Fs supplied from the frame memory 71-1, with a frequency n times as high as the sampling frequency Fs. Oversampling is performed at the frequency nFs to generate a 1-bit pulse density modulation signal per sample at the oversampling frequency nFs.

  The ΔΣ modulation unit 72-2 is configured in the same manner as the ΔΣ modulation unit 32-2, and is supplied from the frame memory 71-2 and is one frame after the frame that is ΔΣ modulated by the ΔΣ modulation unit 72-1. A pulse density modulation signal is generated by subjecting the moving image signal to ΔΣ modulation. The ΔΣ modulation unit 72-2 supplies the generated pulse density modulation signal to the frame interpolation unit 74.

  For example, the ΔΣ modulation unit 72-2 oversamples the 8-bit moving image frame signal per sample of the sampling frequency Fs supplied from the frame memory 71-2 at a frequency n times the sampling frequency Fs. Oversampling is performed at the frequency nFs to generate a 1-bit pulse density modulation signal per sample at the oversampling frequency nFs.

  That is, each of the ΔΣ modulation unit 72-1 and the ΔΣ modulation unit 72-2 generates a pulse density modulation signal composed of pulses having a reference time interval of 1 / nFs seconds.

  The motion vector detection unit 73 is configured in the same manner as the motion vector detection unit 33, and is a signal of a frame supplied from the frame memory 71-1 and a frame supplied from the frame memory 71-2, which are adjacent frame signals. A motion vector indicating the motion of the image is detected from the signal. The motion vector detection unit 73 supplies the detected motion vector to the frame interpolation unit 74.

  The frame interpolation unit 74 performs motion compensation for each pulse of the pulse density modulation signal supplied from the ΔΣ modulation unit 72-1, and performs motion compensation for each pulse of the pulse density modulation signal supplied from the ΔΣ modulation unit 72-2. Each pulse density modulation signal is supplied to the switch 75.

  Further, the frame interpolation unit 74 supplies a weight α corresponding to the position of the frame and each pulse of the pulse density modulation signal to the switch 75.

  The frame interpolation unit 74 includes a motion compensation unit 91-1 and a motion compensation unit 91-2.

  The motion compensation unit 91-1 is configured in the same manner as the motion compensation unit 51-1, and in accordance with the motion vector supplied from the motion vector detection unit 73, the motion compensation unit 91-1 receives the pulse density modulation signal supplied from the ΔΣ modulation unit 72-1. Each pulse is motion compensated.

  The motion compensation unit 91-2 is configured in the same manner as the motion compensation unit 51-2, and in accordance with the motion vector supplied from the motion vector detection unit 73, the motion compensation unit 91-2 receives the pulse density modulation signal supplied from the ΔΣ modulation unit 72-2. Each pulse is motion compensated.

  The pulse density modulation signal in which each pulse is motion compensated in the motion compensation unit 91-1 is supplied to one terminal of the switch 75, and the pulse density modulation signal in which each pulse is motion compensated in the motion compensation unit 91-2 is The other terminal of the switch 75 is supplied.

  The switch 75 supplies the pulse density modulation signal from the motion compensation unit 91-1 to the display device 76 or the pulse from the motion compensation unit 91-2 according to the weight α supplied from the frame interpolation unit 74. The connection of the contacts is switched so that the density modulation signal is supplied to the display device 76.

  For example, the switch 75 is a weight supplied from the frame interpolation unit 74, which is the first time of a subframe among subframes of the same length, each of which is divided into a predetermined number of times. The pulse density modulation signal from the motion compensation unit 91-1 is supplied to the display device 76 for a time corresponding to α, and the pulse density modulation signal from the motion compensation unit 91-2 is displayed for the remaining time of the subframe. The connection of the contact is switched so as to be supplied to the device 76.

  In this case, for example, the weight α is the ratio of the time from the time of the subframe to the last time of the frame with respect to the time of one frame.

  More specifically, as shown in FIG. 16, when a weight α of 0 or more and 1 or less is supplied from the frame interpolation unit 74, the switch 75 has a subframe period length of 1. The pulse density modulation signal from the motion compensation unit 91-1 is supplied to the display device 76 during the first period of the frame and the length of the weight α, and the remaining period of the subframe is 1− In the period of α, the connection of the contacts is switched so that the pulse density modulation signal from the motion compensation unit 91-2 is supplied to the display device 76.

  The display device 76 is an LCD or a PDP, and is driven by a 1-bit pulse density modulation signal per sample with an oversampling frequency nFs supplied via the switch 75, and displays an image corresponding to the pulse density modulation signal. .

  FIG. 17 is a flowchart for explaining another example of the display process. In step S <b> 31, the ΔΣ modulation unit 72-2 acquires the forward referenced frame from the frame memory 71-2 and ΔΣ modulates the acquired frame.

  In step S <b> 32, the ΔΣ modulation unit 72-1 acquires a backward referenced frame from the frame memory 71-1 and ΔΣ modulates the acquired frame.

  In step S <b> 33, the motion compensation unit 91-2 of the frame interpolation unit 74 obtains a pulse density modulation signal obtained by ΔΣ modulation of the forward referenced frame in accordance with the motion vector supplied from the motion vector detection unit 73. Motion compensation for each pulse of.

  In step S34, the frame interpolating unit 74 is a pulse of the motion-compensated pulse density modulation signal of the frame referred to in the front, and from the time of the subframe to the time of one frame of the subframes, The display device 76 is driven for the first period of the length corresponding to the weight α which is the ratio of the time until the last time. That is, the frame interpolation unit 74 uses the pulse of the motion-compensated pulse density modulation signal of the forward referenced frame in the first period of the subframes and the length corresponding to the weight α. The display device 76 is driven.

  For example, in step S34, the frame interpolation unit 74 connects the motion compensation unit 91-2 and the display device 76 in the period of the first weight α in the subframe having a length of 1. To drive the display device 76 with a pulse of the motion compensated pulse density modulated signal of the forward referenced frame.

  In step S <b> 35, the motion compensation unit 91-1 of the frame interpolation unit 74 performs the pulse density modulation signal obtained by performing ΔΣ modulation on the backward referenced frame in accordance with the motion vector supplied from the motion vector detection unit 73. Motion compensation for each pulse of.

  In step S36, the frame interpolation unit 74 drives the display device 76 for the remaining period of the subframe with the pulse of the motion-compensated pulse density modulation signal of the later referenced frame. That is, the frame interpolation unit 74 is a pulse of the motion-compensated pulse density modulation signal of the later referenced frame in the later period of the subframe and in the period corresponding to 1-α. Then, the display device 76 is driven.

  For example, in step S36, the frame interpolation unit 74 switches the motion compensation unit 91-1 and the display device 76 in the last 1-α length period of the subframe having a length of 1. Via 75, the display device 76 is driven with a pulse of a motion compensated pulse density modulated signal in a later referenced frame.

  And a procedure returns to step S31 and repeats the process mentioned above.

  Thus, the moving image blur of the image displayed on the display device 76 can be further reduced.

  As described above, moving image blur can be greatly improved.

  In the case where the display device 36 or the display device 76 is an LCD, there is no reduction in luminance as seen in the backlight scanning method.

  When the display device 36 or the display device 76 is a PDP, pseudo contour noise can be significantly reduced.

  When the display device 36 or the display device 76 is a PDP, since the length of the subframe is constant, nonlinear distortion does not occur.

  The display device 36 or the display device 76 is not limited to the LCD or the PDP, and various display devices such as DMD (digital micromirror device) (trademark) can be used, and a single driving method can be used.

  As described above, when the display device is driven by the pulse density modulation signal obtained by performing the pulse density modulation on the moving image signal, the moving image can be displayed on the display device. In addition, when moving image signals are subjected to pulse density modulation, and each pulse of the pulse density modulation signal, which is a pulse density modulated moving image signal, is compensated for motion, motion blur can be reduced. .

  The display control device may be configured as a part of a television receiver or a display, or may be a set top box, a hard disk recorder player, an optical disk recorder player, or an AV (Audio Visual) amplifier. It can also be configured as part.

  The series of processes described above can be executed by hardware or can be executed by software. When a series of processing is executed by software, a program constituting the software executes various functions by installing a computer incorporated in dedicated hardware or various programs. For example, it is installed from a program recording medium in a general-purpose personal computer or the like.

  FIG. 18 is a block diagram illustrating a configuration example of hardware of a computer that executes the above-described series of processing by a program.

  In a computer, a central processing unit (CPU) 201, a read only memory (ROM) 202, and a random access memory (RAM) 203 are connected to each other by a bus 204.

  An input / output interface 205 is further connected to the bus 204. The input / output interface 205 includes an input unit 206 composed of a keyboard, mouse, microphone, etc., an output unit 207 composed of a display, a speaker, etc., a storage unit 208 composed of a hard disk or nonvolatile memory, and a communication unit 209 composed of a network interface. A drive 210 for driving a removable medium 211 such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory is connected.

  As the CPU 201, the Cell described in “Birth of Cell”, Nikkei Electronics, Nikkei BP, February 28, 2005, pages 89 to 117 can be employed.

  In the computer configured as described above, the CPU 201 loads, for example, the program stored in the storage unit 208 to the RAM 203 via the input / output interface 205 and the bus 204 and executes the program. Is performed.

  The program executed by the computer (CPU 201) is, for example, a magnetic disk (including a flexible disk), an optical disk (CD-ROM (Compact Disc-Read Only Memory), DVD (Digital Versatile Disc), etc.), a magneto-optical disk, or a semiconductor. The program is recorded on a removable medium 211 that is a package medium composed of a memory or the like, or provided via a wired or wireless transmission medium such as a local area network, the Internet, or digital satellite broadcasting.

  The program can be installed in the computer by loading the removable medium 211 in the drive 210 and storing it in the storage unit 208 via the input / output interface 205. Further, the program can be installed in a computer by being received by the communication unit 209 via a wired or wireless transmission medium and stored in the storage unit 208. In addition, the program can be installed in the computer in advance by storing the program in the ROM 202 or the storage unit 208 in advance.

  The program executed by the computer may be a program that is processed in time series in the order described in this specification, or in parallel or at a necessary timing such as when a call is made. It may be a program for processing.

  The embodiment of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

It is a figure explaining the moving image blur in LCD. It is a figure explaining the moving image blur in PDP. It is a figure explaining the moving image blurring of the image of a high frame rate. It is a figure explaining the moving image blur in the case of driving a display device with a pulse density modulation signal. It is a block diagram which shows an example of a structure of the display control apparatus of one embodiment of this invention. It is a block diagram which shows the other example of a structure of the display control apparatus of one embodiment of this invention. It is a figure which shows the example of the pulse density modulation signal supplied to a motion compensation part. It is a figure explaining the motion compensation of each pulse of a pulse density modulation signal. It is a figure explaining the motion compensation of each pulse of a pulse density modulation signal. It is a figure explaining the pulse density modulation signal by which the signal of the moving image, the pulse density modulation signal, and the pulse were motion compensated. It is a figure explaining the pulse density modulation signal which drives a display device. It is a figure explaining the moving image blur in the image recognized. It is a figure explaining the moving image blur in fixed vision. It is a flowchart explaining the example of a process of a display. It is a block diagram which shows the further another example of a structure of the display control apparatus of one embodiment of this invention. It is a figure explaining switching of a pulse density modulation signal. It is a flowchart explaining the other example of the process of a display. It is a block diagram which shows the structural example of the hardware of a computer.

Explanation of symbols

  11-1 and 11-2 frame memory, 12 frame interpolation unit, 13 ΔΣ modulation unit 13, 14 display device, 31-1 and 31-2 frame memory, 32-1 and 32-2 ΔΣ modulation unit, 33 motion vector detection Unit, 34 frame interpolation unit, 35 ΔΣ modulation unit, 36 display device, 51-1, 51-2, and 51 motion compensation unit, 52-1 and 52-2 multiplier, 53 adder, 71-1 and 71- 2 frame memory, 72-1 and 72-2 ΔΣ modulation unit, 73 motion vector detection unit, 74 frame interpolation unit, 75 switch, 76 display device, 91-1 and 91-2 motion compensation unit, 201 CPU, 202 ROM, 203 RAM, 208 storage unit, 211 removable media

Claims (8)

First modulation means for pulse density modulating a moving image signal;
A display control apparatus comprising: a first motion compensation unit that compensates motion of each pulse of a pulse density modulation signal that is a pulse density modulated moving image signal. The display control apparatus according to claim 1, further comprising a driving unit that drives a display device by the pulse density modulation signal in which each pulse is motion-compensated. The first modulation means performs pulse density modulation on the signal of the first frame of the moving image,
The first motion compensation means performs motion compensation on each pulse of a pulse density modulation signal in which the signal of the first frame is pulse density modulated,
Second modulation means for pulse density modulating the signal of the second frame of the moving image, which is a second frame adjacent to the first frame;
A second motion compensation means for compensating motion of each pulse of the pulse density modulation signal in which the signal of the second frame of the moving image is subjected to pulse density modulation;
The driving means includes a pulse density modulation signal in which each pulse is subjected to motion compensation, a pulse density modulation signal in which the signal in the first frame is pulse density modulated, and a pulse density modulation in which the signal in the second frame is pulse density modulated. The display control apparatus according to claim 2, wherein the display device is driven by a signal. The driving means includes
A pulse density modulation signal in which the signal of the first frame is pulse density modulated and each pulse is motion-compensated, and the signal of the second frame following the first frame from the time of the first frame In the pulse density modulation signal arranged at the time until the time, the time from the time of the first frame to the time of the second frame, the time from the time of each pulse to the time of the second frame, First weighting means for weighting the ratio of
A signal of the second frame next to the first frame is a pulse density modulated signal in which each pulse is motion-compensated, and the pulse of the second frame from the time of the first frame. In the pulse density modulation signal arranged at the time until the time, the time from the time of the first frame to the time of the second frame, the time from the time of the first frame to the time of each pulse, Second weighting means for weighting the ratio of
Adding means for adding a weighted pulse density modulated signal obtained by pulse density modulation of the first frame signal and a pulse density modulated signal obtained by pulse density modulation of the second frame signal. ,
The display control apparatus according to claim 3, wherein the display device is driven according to a result of addition. The display control apparatus according to claim 4, further comprising third modulation means that modulates a pulse density result of the addition in the driving means and supplies the result to the display device. The driving means includes
A pulse density modulation signal in which the signal of the first frame is pulse density modulated and each pulse is motion-compensated, and the signal of the second frame following the first frame from the time of the first frame Of the first time of each of the subframes divided into a predetermined number from the time of the first frame to the time of the second frame in the pulse density modulation signal arranged at the time up to the time, the Driving the display device at a time that is the ratio of the time from the time of each pulse to the time of the second frame to the time from the time of the first frame to the time of the second frame;
A signal of the second frame next to the first frame is a pulse density modulated signal in which each pulse is motion-compensated, and the pulse of the first frame is measured from the time of the first frame. The display control apparatus according to claim 3, wherein the display device is driven for each remaining time of the subframe with a pulse density modulation signal arranged at a time until a time of the next second frame. Pulse density modulation of moving image signal,
A display control method including a step of performing motion compensation for each pulse of a pulse density modulation signal that is a pulse density modulated moving image signal. Pulse density modulation of moving image signal,
A program that causes a computer to perform processing including a step of motion compensation for each pulse of a pulse density modulation signal that is a pulse density modulated moving image signal.

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