JP5081058B2 - Image processing apparatus and image processing apparatus control method - Google Patents

Description

  The present invention relates to an image processing apparatus and a control method for the image processing apparatus.

  In recent years, images have been displayed at a frame rate higher than the frame rate of an input video signal in order to suppress flicker associated with an increase in the screen size of a display device.

  When displaying an image at a frame rate higher than the frame rate of the input video signal, it is necessary to newly generate and display a frame that does not exist in the input video signal. The simplest method is to display the frame of the input video signal. There is a method to display repeatedly.

  In such a method, there is no problem when a stationary object is displayed, but there is a problem that an afterimage can be seen when a moving object is displayed. FIG. 10 is a diagram for explaining the principle that an afterimage can be seen when a frame of an input video signal is repeatedly displayed. FIG. 10A shows a case where a moving object is displayed at 60 frames / second, and FIG. 10B shows a case where the same image is displayed twice and displayed at 120 frames / second. In the case of FIG. 10A, when the observer moves his / her line of sight following the movement of the object, the observer perceives only one object image. On the other hand, in the case of FIG. 10B, the image of the object displayed for the second time is perceived at a position shifted from the image of the object displayed for the first time, resulting in an afterimage. At this time, the shift amount of the image of the object displayed for the second time is half of the movement amount between the input frames of the original object.

  For this reason, a method has been proposed in which interpolation is performed based on successive frames of the input video signal to generate a frame between successive frames, that is, an interpolation frame. However, this method requires a large-scale processing circuit for performing interpolation processing.

Therefore, even when a moving object is displayed, a technique has been proposed that realizes display with little afterimage without using a large-scale processing circuit (see Patent Document 1). In Patent Document 1, when an input video signal is stored in a frame memory and is read and displayed at a frame rate higher than the input, a part of image data (image data corresponding to a moving object) is masked. As a result, the afterimage is reduced.
Japanese Patent No. 3841104

  In Patent Document 1, as a preferred embodiment, when an output is doubled with respect to one input frame, a pixel replaced with data masked in one frame and a mask in the other frame It is disclosed to alternately arrange pixels to be replaced with the processed data.

  FIG. 11 shows how an image looks when such a display is performed. FIG. 11A shows input frames (input frames) Fin (N) to Fin (N + 3), where a white character “A” moves from left to right on a black background. Yes. FIG. 11B shows an output frame (output frame). FIG. 11C shows an image perceived when the observer causes his / her line of sight to follow the movement of the letter “A” when the output frame shown in FIG. 11B is displayed. In this case, since the two output frames are images having the same brightness (luminance), the observer observes an image having the same luminance and overlapping the movement between the frames by half. Reduction effect is low.

  Patent Document 1 discloses that one frame is not masked (that is, not replaced with masked data for all pixels), and the other frame is masked for all pixels (that is, all pixels are not masked). (Replace with masked data). In this case, since the luminance of one frame is lower than the luminance of the other frame, the pixel replaced with the data masked in one frame and the pixel replaced with the data masked in the other frame The effect of reducing the afterimage can be enhanced as compared with the case where they are arranged alternately. However, since all the pixels are displayed in both frames, the afterimage reduction effect remains low.

  Therefore, in view of such a problem of the prior art, the present invention provides an image processing apparatus and an image processing apparatus control method capable of suppressing flicker and improving the afterimage reduction effect. Objective.

  In order to achieve the above object, an image processing apparatus according to a first aspect of the present invention includes a storage unit that stores an input video signal as frame data in accordance with an input frame rate, and the frame data stored in the storage unit. Generation means for reading out and copying at a frame rate higher than the input frame rate, and generating a plurality of frame data from the same frame data; and a conversion means for converting pixel values of the plurality of frame data generated by the generation means; Display means for displaying a plurality of frame data converted by the conversion means at a frame rate higher than the input frame rate, and the conversion means includes pixels of the frame data during one frame period. A pixel that is displayed only once with the same pixel value as the value, and a pixel value of the frame data As the pixels displayed multiple times in divided pixel values equal is included at a predetermined ratio, and converting the pixel values of the plurality of frame data.

  According to a second aspect of the present invention, there is provided a control method for an image processing apparatus, a storage step of storing an input video signal as frame data according to an input frame rate, and the frame data stored in the storage step more than the input frame rate. A generation step of reading and copying at a high frame rate and generating a plurality of frame data from the same frame data, a conversion step of converting pixel values of the plurality of frame data generated in the generation step, and the conversion step A display step of displaying the plurality of converted frame data at a frame rate higher than the input frame rate, and in the conversion step, a pixel value equal to a pixel value of the frame data during one frame period And the image of the frame data displayed only once. As the pixels displayed multiple times in pixel value obtained by equally dividing the value is included at a predetermined ratio, and converting the pixel values of the plurality of frame data.

  Further objects and other aspects of the present invention will become apparent from the preferred embodiments described below with reference to the accompanying drawings.

  According to the present invention, for example, it is possible to provide an image processing apparatus and an image processing apparatus control method that suppress flicker and improve the afterimage reduction effect.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings. In addition, in each figure, the same reference number is attached | subjected about the same member and the overlapping description is abbreviate | omitted.
[First Embodiment]
FIG. 1 is a schematic block diagram showing the configuration of the image processing apparatus 1 according to the first embodiment of the present invention. The image processing apparatus 1 displays an image at a frame rate higher than the frame rate of the input video signal. As illustrated in FIG. 1, the image processing apparatus 1 includes a write control unit 102, a frame memory 104, a read control unit 106, a multiplication unit 108, a coefficient selection unit 110, and a display unit 112.

  The write control unit 102 controls data writing (storage) to the frame memory 104. Specifically, the write control unit 102 writes (stores) an input video signal input from the outside of the image processing apparatus 1 in the frame memory 104.

  The frame memory 104 stores the input video signal input from the write control unit 102 as frame data (image data) according to a synchronization signal (input frame rate) included in the input video signal.

  The read control unit 106 controls reading of data stored in the frame memory 104. Specifically, the read control unit 106 reads out and copies the frame data stored in the frame memory 104 at a frame rate higher than the input frame rate, and generates a plurality of frame data from the same frame data. In the present embodiment, the read control unit 106 reads frame data at a frame rate that is twice the input frame rate, and inputs the frame data to the multiplication unit 108. Therefore, the same frame data is read twice from the frame memory 104 and input to the multiplication unit 108.

  The multiplication unit 108 multiplies the pixel value of each pixel of the frame data input from the read control unit 106 by the coefficient input from the coefficient selection unit 110 and inputs the frame data to the display unit 112. In other words, the multiplication unit 108 masks the frame data input from the read control unit 106 with the coefficient output from the coefficient selection unit 110 and inputs the masked data to the display unit 112.

  In order to mask the frame data input from the readout control unit 106 to the multiplication unit 108, the coefficient selection unit 110 outputs a predetermined coefficient according to the address of the pixel of the frame data (that is, for each pixel). In other words, the coefficient selection unit 110 inputs a coefficient pattern (so-called mask data) having a predetermined coefficient for each pixel of the frame data to the multiplication unit 108.

  The display unit 112 displays the frame data image input from the multiplication unit 108 at a frame rate higher than the input frame rate (that is, the read control unit 106 reads frame data from the frame memory 104). Therefore, in this embodiment, the display unit 112 displays an image at a frame rate that is twice the input frame rate of the input video signal. The display unit 112 is, for example, a surface conduction electron emitter display (SED) using a surface conduction electron-emitting device, and performs driving such that luminance proportional to the size of input frame data is obtained. However, the display unit 112 is not limited to the SED, and may be any display as long as it can display an image at a frame rate higher than the frame rate of the input video signal.

  In the present embodiment, the multiplication unit 108 and the coefficient selection unit 110 cooperate to perform data conversion of a plurality of frame data generated by the read control unit 106 as described above. Specifically, a pixel that is displayed only once with the same pixel value as the pixel value of the frame data stored in the frame memory 104 and a pixel value that is obtained by equally dividing the pixel value of the frame data are displayed multiple times. Data conversion is performed so that pixels are included at a predetermined ratio.

  FIG. 2 is a diagram for explaining the operation of the image processing apparatus 1 according to the first embodiment. FIG. 2A shows frame data (input frames) Fin (N) to Fin (N + 2) input to the write control unit 102 (stored in the frame memory 104). In the example of this embodiment, FIG. The white letter “A” moves from left to right on a black background.

  The read control unit 106 reads and duplicates the input frame stored in the frame memory 104, and generates a read frame as shown in FIG. Specifically, the read control unit 106 generates read frames Fout1 (N) and Fout2 (N) from the input frame Fin (N). Similarly, the read control unit 106 generates read frames Fout1 (N + 1) and Fout2 (N + 1) from the input frame Fin (N + 1). Similarly, the read control unit 106 generates read frames Fout1 (N + 2) and Fout2 (N + 2) from the input frame Fin (N + 2).

  The multiplication unit 108 multiplies the readout frame (the pixel value of each pixel) input from the readout control unit 106 by the coefficient pattern output from the coefficient selection unit 110, and outputs an output frame as shown in FIG. Convert to Specifically, the coefficient selection unit 110 outputs the coefficient pattern shown in FIG. 3A for the readout frame Fout1 (N), and outputs the coefficient pattern shown in FIG. 3B for the readout frame Fout2 (N). ) Is output. The coefficient pattern shown in FIG. 3A is a unit of 2 × 2 4 pixels, and has a coefficient of 1.0 and a coefficient of 0.5 on the diagonal. The coefficient pattern shown in FIG. 3B has 2 × 2 4 pixels as a unit, and has a coefficient of 0 and a coefficient of 0.5 on the diagonal corresponding to the coefficient pattern shown in FIG. . In other words, the coefficient is 1 in the readout frame Fout1 (N), the coefficient is 0 in each of the pixels in which the coefficient is 0 in the readout frame Fout2 (N), and each of the readout frames Fout1 (N) and Fout2 (N). 5 is arranged. The multiplier 108 multiplies the read frames Fout1 (N) and Fout2 (N) by the coefficient patterns shown in FIG. 3A and FIG. 3B output from the coefficient selector 110, and outputs the output frame Fd1. Convert to (N) and Fd2 (N). Similarly, the multiplication unit 108 multiplies the read frames Fout1 (N + 1) and Fout2 (N + 1) by the coefficient patterns shown in FIGS. 3A and 3B output from the coefficient selection unit 110, respectively. The output frames are converted into Fd1 (N + 1) and Fd2 (N + 1). Similarly, the multiplication unit 108 multiplies the read frames Fout1 (N + 2) and Fout2 (N + 2) by the coefficient patterns shown in FIGS. 3A and 3B output from the coefficient selection unit 110, respectively. The output frames are converted into Fd1 (N + 2) and Fd2 (N + 2). Here, FIG. 3 is a diagram illustrating an example of a coefficient pattern output from the coefficient selection unit 110.

  The display unit 112 displays the images of the output frames Fd1 (N) to Fd2 (N + 2) shown in FIG. 3C input from the multiplication unit 108 (that is, displays the image at a frame rate twice the input frame rate). indicate). At this time, the display unit 112 displays a pixel that is displayed only once with the same pixel value as the pixel value of the input frame and a pixel value of 0.5 that is the pixel value of the input frame during one frame period. Images of frames in which displayed pixels are alternately arranged are sequentially displayed.

  FIG. 4 shows an image perceived when the observer causes his / her line of sight to follow the movement of the letter “A” when the output frames Fd1 (N) to Fd2 (N + 2) shown in FIG. 3 are displayed. Referring to FIG. 4, since the two output frames are not images having the same brightness (luminance), the afterimage range is reduced compared to the conventional technique (FIG. 11), and the afterimage reduction effect is improved. You can see that Further, since there are pixels to be displayed in two frames output for one input frame, there is also an effect of suppressing flicker.

  As described above, according to the image processing apparatus 1, it is possible to suppress flicker and improve the afterimage reduction effect.

Further, in the present embodiment, the coefficient pattern output from the coefficient selection unit 110 is set to a 2 × 2 4-pixel unit, and the pixel that is displayed only once is displayed twice during one frame period of the input video signal. An example in which the ratio to the pixel is 1: 1 is shown. However, the unit of the coefficient pattern is not limited to four pixels, and the ratio of the pixels displayed only once and the pixels displayed twice is not limited to 1: 1. For example, the coefficient pattern may be a unit of 3 × 3 9 pixels, and the ratio of the pixels displayed only once and the pixels displayed twice may be 4: 5 during one frame period of the input video signal. . In this case, the effect of reducing the afterimage is reduced, but the effect of suppressing flicker can be improved.
[Second Embodiment]
FIG. 5 is a schematic block diagram showing the configuration of the image processing apparatus 1A according to the second embodiment of the present invention. The image processing apparatus 1 </ b> A further includes a determination unit 122 in addition to the configuration of the image processing apparatus 1.

  Based on a control signal included in the input video signal, the determination unit 122 determines whether the input video signal (frame data) is a moving image broadcast (a normal broadcast mainly including a moving image) or a still image broadcast (a data broadcast with a high ratio of still images). And the determination result is output to the coefficient selection unit 110. Note that the determination unit 122 may detect that the input video signal has been switched from video broadcast to still image broadcast, or from still image broadcast to video broadcast, and output the detected signal to the coefficient selection unit 110.

  The coefficient selection unit 110 changes the coefficient pattern to be output to the multiplication unit 108 based on the determination result of the determination unit 122, the pixel displayed only once with the same pixel value as the pixel value of the input frame, and the input frame The ratio of the pixel displayed twice with the pixel value of 0.5 is changed.

  Specifically, when the determination unit 122 determines that the input video signal is a moving image broadcast, the coefficient selection unit 110 performs FIG. 3 on each of the read frames Fout1 (N) and Fout2 (N). The coefficient patterns shown in a) and (b) are output. In the coefficient patterns shown in FIGS. 3A and 3B, as described above, the ratio of the pixel displayed only once and the pixel displayed twice is 1 during one frame period of the input video signal. Is a coefficient pattern.

  On the other hand, when the determination unit 122 determines that the input video signal is a still image broadcast, the coefficient selection unit 110 performs FIG. 6A on each of the read frames Fout1 (N) and Fout2 (N). And the coefficient pattern shown in (b) is output. The coefficient patterns shown in FIGS. 6A and 6B are coefficients in which the ratio of pixels displayed only once and pixels displayed twice is 1: 3 during one frame period of the input video signal. It is a pattern. FIG. 6 is a diagram illustrating an example of a coefficient pattern output from the coefficient selection unit 110.

  Therefore, according to the image processing apparatus 1A, when the input video signal is a moving image broadcast, the afterimage reduction effect is improved, and when the input video signal is a still image broadcast, the flicker suppression effect is improved. It is possible to perform optimal display according to the input video signal.

In addition, the coefficient pattern output from the coefficient selection unit 110 in the present embodiment is not limited to the coefficient patterns shown in FIGS. 3 and 6, and is appropriate according to the required afterimage reduction effect and flicker suppression effect. A simple coefficient pattern can be output.
[Third Embodiment]
FIG. 7 is a schematic block diagram showing the configuration of the image processing apparatus 1B according to the third embodiment of the present invention. In addition to the configuration of the image processing device 1, the image processing device 1 </ b> B further includes a motion region detection unit 132 and a motion level determination unit 134.

  The motion region detection unit 132 detects a motion between frame data from the frame data that the write control unit 102 writes to the frame memory 104 and the frame data that is one frame before the read control unit 106 reads from the frame memory 104. Specifically, the motion region detection unit 132 divides the frame data into a plurality of blocks in units of m × n pixels, and detects a motion between the frame data for each of the plurality of blocks. Note that the detection result of the motion region detection unit 132 is input to the motion level determination unit 134.

  In the present embodiment, the motion region detection unit 132 calculates a difference between pixel values of a plurality of pixels existing in a corresponding block between frame data, and the sum of absolute values of the differences is equal to or greater than a threshold value. Detects that there is motion between the frame data for the block. Similarly, the motion region detection unit 132 calculates a difference between pixel values of a plurality of pixels existing in a corresponding block between frame data, and when the sum of absolute values of the differences is less than a threshold value. , It detects that there is no motion between the frame data for the block.

The motion level determination unit 134 determines a motion level indicating the degree of motion for each of a plurality of blocks of frame data based on the detection result of the motion region detection unit 132. In the present embodiment, the motion level determination unit 134 increases the motion level of a block detected when there is motion between frame data, and decreases the motion level of a block detected when there is no motion between frame data by 1. However, the motion level has an upper limit value and a lower limit value. In this embodiment, the upper limit value is 10 and the lower limit value is 1.
Therefore, the motion level determination unit 134 does not change the motion level even if it is detected that there is motion between frame data for a block whose motion level has reached the upper limit (10 in the present embodiment). (That is, do not increase the movement level). Similarly, the motion level determination unit 134 changes the motion level even if it is detected that there is no motion between frame data for a block whose motion level has reached the lower limit (1 in the present embodiment). (Ie, do not lower the motion level).

  The coefficient selection unit 110 outputs a coefficient pattern to be output to the multiplication unit 108 for each of a plurality of blocks of frame data based on the motion level determined by the motion level determination unit 134. In other words, the coefficient selecting unit 110 displays, for each of a plurality of blocks of frame data, a pixel that is displayed only once with the same pixel value as the pixel value of the input frame, and a pixel value of 0.5 of the pixel value of the input frame. To change the ratio of the pixel displayed twice.

  In the present embodiment, the coefficient selection unit 110 is illustrated for each of the read frames Fout1 (N) and Fout2 (N) (specifically, each block of the read frames Fout1 (N) and Fout2 (N)). A coefficient pattern as shown in FIG. FIG. 8 shows coefficient patterns output for each (block) of the read frames Fout1 (N) and Fout2 (N) according to the motion level. In this embodiment, 6 × 6 36 pixels are defined as one block, the coefficient of a pixel indicated by white is 1, the coefficient of a pixel indicated by gray is 0.5, and the coefficient of a pixel indicated by black is 0.

  Referring to FIG. 8, for example, for a block of motion level 1, the coefficient selection unit 110 displays pixels that are displayed only once and pixels that are displayed twice during one frame period of the input video signal. A coefficient pattern with a ratio of 1: 3 is output. As the motion level increases, a coefficient pattern in which the ratio of the pixels displayed twice during one frame period of the input video signal is reduced is output, and the pixels displayed only once for the block of motion level 10 A coefficient pattern in which the ratio of pixels displayed twice is 1: 1 is output. In other words, as the motion level increases, the coefficient selection unit 110 performs a plurality of times using a pixel that is displayed only once with the same pixel value as the pixel value of the input frame and a pixel value that is obtained by equally dividing the pixel value of the input frame. A coefficient pattern is output so that the displayed pixels approach a 1: 1 ratio.

  FIG. 9 is a diagram for explaining the operation of the image processing apparatus 1B according to the third embodiment. In this embodiment, as shown in FIG. 9, a case where an image in which an object moves from left to right is input as an input frame will be described.

  When the first input frame Fin (0) is input, there is no previous frame (read frame) for detecting the motion between the frame data. Therefore, the motion region detection unit 132 detects the motion between the frame data. Do not detect. In addition, the motion level determination unit 134 sets (determines) the motion level of all blocks to 1.

  Next, when the input frame Fin (1) is input, the motion region detection unit 132 detects the motion of the corresponding block between frames from the input frame Fin (0) and the input frame Fin (1). In the present embodiment, the sum of absolute values of differences between pixel values of a plurality of pixels existing in the corresponding central block of the input frame Fin (0) and the input frame Fin (1) is equal to or greater than the threshold value. Therefore, the motion region detection unit 132 detects that there is a motion in the central block. Further, the motion level determination unit 134 increases the motion level of the central block detected by the motion region detection unit 132 as having motion. As a result, the motion level of the central block is 2. The blocks other than the central portion are detected by the motion region detection unit 132 as having no motion, but since the motion levels of all the blocks are set to 1 (lower limit value), the motion level determination unit 134 The movement level of blocks other than the central part is not lowered by one. In other words, the motion level of the blocks other than the central portion does not change.

  Next, when the input frame Fin (2) is input, the motion region detection unit 132 detects the motion of the corresponding block between frames from the input frame Fin (1) and the input frame Fin (2). In the present embodiment, the sum of the absolute values of the differences between the pixel values of a plurality of pixels existing in the rightmost block from the corresponding central portion of the input frame Fin (1) and the input frame Fin (2) is greater than or equal to the threshold Become. Therefore, the motion region detection unit 132 detects that there is motion in the rightmost block from the center. In addition, the motion level determination unit 134 increases the motion level of the rightmost block from the center detected by the motion region detection unit 132 as having motion. As a result, the motion level of the central block is 3, and the motion level of the rightmost block is 2. However, a part (left side) of the central blocks is detected as having no motion by the motion region detection unit 132 because the sum of absolute values of pixel value differences is less than the threshold value. The motion level determination unit 134 decreases the motion level of the block by one. As a result, the motion level of the left block at the center is 1.

  The coefficient selection unit 110 outputs the coefficient pattern shown in FIG. 8 based on the motion level determined by the motion level determination unit 134. As a result, it is possible to display the image on the display unit 112 by improving the afterimage reduction effect for a block with a high motion level and improving the flicker suppression effect for a block with a low motion level.

  In the image processing apparatus 1B, when the motion is detected, the continuously detected block is gradually increased in the motion level and displayed with less afterimage, and when there is no motion, the continuously detected block is gradually decreased in the motion level. Display with less flicker. The reason why the motion level is gradually changed is that the ratio of the pixel displayed only once and the pixel displayed twice is rapidly between adjacent frames during one frame period of the input video signal. This is because such changes are perceived and disturbed by the observer.

As described above, according to the image processing apparatus 1B, a coefficient pattern suitable for the motion level can be output for each of a plurality of blocks of the frame data in accordance with the motion level between the frame data, thereby suppressing flicker. In addition, the afterimage reduction effect can be improved. In this embodiment, the frame data is divided into a plurality of blocks, and the motion level is determined by detecting whether or not there is motion between the frame data for each of the plurality of blocks. However, the entire frame data may be regarded as one block, and the motion level may be determined by detecting whether there is motion in the entire frame data.
[Other Embodiments]
The object of the present invention can also be achieved by supplying a recording medium in which a program code of software realizing the functions of the above-described embodiments is supplied to a system or apparatus. Therefore, it goes without saying that this can also be achieved by a computer (CPU or MPU) of such a system or apparatus reading and executing the program code recorded on the recording medium.

  In this case, the program code itself read from the recording medium realizes the functions of the above-described embodiments, and the recording medium on which the program code is recorded constitutes the present invention. As a recording medium for recording (supplying) the program code, for example, a flexible disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a CD-R, a magnetic tape, a nonvolatile semiconductor memory card, a ROM, or the like is used. be able to.

  Further, the functions of the above-described embodiments may be realized by executing the program code read by the computer. However, an OS (operating system) running on the computer may perform part or all of the actual processing based on the instruction of the program code, and the functions of the above-described embodiments may be realized by such processing. Needless to say, it is included.

  Further, the program code read from the recording medium may be written in a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer. Accordingly, a case where the CPU of the function expansion board or the function expansion unit performs part or all of the actual processing based on the instruction of the program code and the functions of the above-described embodiments are realized by such processing is included. Needless to say.

  As mentioned above, although preferred embodiment of this invention was described, it cannot be overemphasized that this invention is not limited to these Examples, A various deformation | transformation and change are possible within the range of the summary.

1 is a schematic block diagram illustrating a configuration of an image display device according to a first embodiment of the present invention. It is a figure for demonstrating operation | movement of the image processing apparatus in 1st Embodiment. It is a figure which shows an example of the coefficient pattern output from the coefficient selection part of the image processing apparatus in 1st Embodiment. FIG. 4 is a diagram showing an image perceived when an observer causes his / her line of sight to follow the movement of a character “A” when the output frame shown in FIG. 3 is displayed. It is a schematic block diagram which shows the structure of the image processing apparatus in the 2nd Embodiment of this invention. It is a figure which shows an example of the coefficient pattern output from the coefficient selection part of the image processing apparatus in 2nd Embodiment. It is a schematic block diagram which shows the structure of the image processing apparatus in the 3rd Embodiment of this invention. It is a figure which shows an example of the coefficient pattern output from the coefficient selection part of the image processing apparatus in 3rd Embodiment. It is a figure for demonstrating operation | movement of the image processing apparatus in 3rd Embodiment. It is a figure for demonstrating the principle in which an afterimage is visible when the frame of an input video signal is displayed repeatedly. It is a figure for demonstrating the appearance of the image in a prior art (patent document 1).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Image processing apparatus 102 Write control part 104 Frame memory 106 Reading control part 108 Multiplication part 110 Coefficient selection part 112 Display part 1A Image processing apparatus 122 Determination part 1B Image processing apparatus 132 Motion area detection part 134 Motion level determination part

Claims (10)

Storage means for storing the input video signal as frame data according to the input frame rate;
Generation means for reading out and copying the frame data stored in the storage means at a frame rate higher than the input frame rate, and generating a plurality of frame data from the same frame data;
Conversion means for converting pixel values of a plurality of frame data generated by the generation means;
Display means for displaying a plurality of frame data converted by the conversion means at a frame rate higher than the input frame rate;
Have
The conversion means displays a pixel that is displayed only once with the same pixel value as the pixel value of the frame data and a pixel value obtained by dividing the pixel value of the frame data evenly during a frame period. An image processing apparatus that converts pixel values of the plurality of frame data so that a predetermined number of pixels are included at a predetermined ratio.   The conversion means has a 1: 1 ratio between a pixel that is displayed only once with the same pixel value as the pixel value of the frame data and a pixel that is displayed multiple times with a pixel value obtained by equally dividing the pixel value of the frame data. The image processing apparatus according to claim 1, wherein pixel values of the plurality of frame data are converted so as to be included at a ratio of (1) to (2). A determination means for determining whether the input video signal is a moving image broadcast or a still image broadcast;
The image processing apparatus according to claim 1, wherein the conversion unit changes the predetermined ratio based on a determination result of the determination unit. The converting means includes
If the determination means determines that the input video signal is a moving image broadcast, the pixels displayed only once with the same pixel value as the pixel value of the frame data and the pixel value of the frame data are evenly distributed. The pixel values of the plurality of frame data are converted so that pixels displayed multiple times with the divided pixel values are included at a ratio of 1: 1,
When the determination means determines that the input video signal is a still image broadcast, the pixel value of the frame data is set to a pixel that is displayed only once with the same pixel value as the pixel value of the frame data. The image processing apparatus according to claim 3, wherein pixel values of the plurality of frame data are converted so that a ratio of pixels displayed a plurality of times with equally divided pixel values is increased. Dividing means for dividing the frame data into a plurality of blocks;
Detecting means for detecting motion between frame data for each of the plurality of blocks divided by the dividing means;
Determining means for determining a motion level indicating a degree of motion for each of the plurality of blocks based on a detection result of the detecting means;
Further comprising
The image processing apparatus according to claim 1, wherein the conversion unit changes the predetermined ratio for each of the plurality of blocks based on a motion level determined by the determination unit. The detecting means calculates a difference between pixel values of a plurality of pixels existing in a corresponding block between the frame data;
When the sum of the absolute values of the differences is equal to or greater than a threshold, it is detected that there is movement between the frame data;
The image processing apparatus according to claim 5, wherein when the sum of absolute values of the differences is less than a threshold, it is detected that there is no movement between the frame data. The determining means includes
If the detection means detects that there is movement between the frame data, the movement level is increased by one;
The image processing apparatus according to claim 6, wherein the motion level is lowered by 1 when the detection unit detects that there is no motion between the frame data. The movement level has an upper limit value and a lower limit value,
The determining means includes
When the movement level has reached the upper limit value, the movement level is not changed even if the detection means detects that there is movement between the frame data,
8. The image according to claim 7, wherein when the movement level reaches the lower limit value, the movement level is not changed even if the detection unit detects that there is no movement between the frame data. Processing equipment.   As the motion level increases, the conversion means displays a pixel that is displayed only once with the same pixel value as the pixel value of the frame data and a pixel value that is obtained by equally dividing the pixel value of the frame data. The image processing apparatus according to claim 7, wherein the predetermined ratio is changed so as to approach a 1: 1 ratio. A control method for an image processing apparatus, comprising:
A storage step of storing the input video signal as frame data according to the input frame rate;
A step of reading out and copying the frame data stored in the storing step at a frame rate higher than the input frame rate, and generating a plurality of frame data from the same frame data;
A conversion step of converting pixel values of a plurality of frame data generated in the generation step;
A display step of displaying a plurality of frame data converted in the conversion step at a frame rate higher than the input frame rate;
Have
In the conversion step, during one frame period, a pixel that is displayed only once with the same pixel value as the pixel value of the frame data and a pixel value obtained by dividing the pixel value of the frame data evenly are displayed multiple times. A control method comprising: converting pixel values of the plurality of frame data so that a predetermined number of pixels are included at a predetermined ratio.