JP2009111885A - Image data processing apparatus, and image data processing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image data processing apparatus and an image data processing method which enable high gradation frame rate conversion using low gradation elements. <P>SOLUTION: First image data of a first frame rate having gradation data of a first number of bits is divided into second image data having gradation data of a second number of bits and third image data having gradation data of a third number of bits. The second image data is interpolated so as to generate fourth image data of a second frame rate larger than the first frame rate, having gradation data of the second number of bits. The third image data is held and outputted for a plural number of times so as to generate fifth image data of the second frame rate having gradation data of the third number of bits. The fifth image data is added to the fourth image data so as to generate sixth image data of the second frame rate having gradation data of the first number of bits. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an image data processing apparatus and an image data processing method for processing image data.

In order to improve the display quality, the frame rate (field frequency) of images and the number of gradations are increasing. At present, images having high and low frame rates (for example, 120 Hz and 60 Hz) and high and low gradation numbers (for example, 12 bits and 8 bits) are mixedly used. Also, the frame rate may be limited due to transmission capacity and the like. For this reason, a technique for converting a low frame rate image into a high frame rate image has been disclosed (see, for example, Patent Document 1). That is, an interpolation field is generated from adjacent fields, and the field frequency is increased.
JP 2000-333134 A

Here, elements for image processing (for example, frame rate conversion) include both for low gradation and for high gradation. Therefore, it is convenient if conversion to a high gradation frame rate can be realized by using an element for low gradation.
In view of the above, an object of the present invention is to provide an image data processing apparatus and an image data processing method that enable high gradation frame rate conversion using a low gradation element.

  An image data processing device according to an aspect of the present invention has gradation data having a first number of bits, and divides the first image data having a first frame rate to obtain a gradation having a second number of bits. Interpolating adjacent frames of the second image data, a data dividing unit that generates second image data having data and third image data having gradation data of a third number of bits, A frame interpolator having gradation data of the second number of bits and generating fourth image data having a second frame rate larger than the first frame rate, and holding the third image data And outputting a plurality of times, a frame buffer having gradation data of the third number of bits and generating fifth image data of the second frame rate, and the second image data If it does not correspond to a still image, A data adding unit that adds the fifth image data to the fourth image data, has gradation data of the first number of bits, and generates sixth image data of the second frame rate It is characterized by comprising.

  An image data processing method according to an aspect of the present invention includes gradation data having a first number of bits, dividing first image data having a first frame rate, and obtaining gradations having a second number of bits. Generating second image data having data and third image data having gradation data of a third number of bits; interpolating successive frames of the second image data; and Generating fourth image data having gradation data of 2 bits and having a second frame rate greater than the first frame rate; and holding the third image data a plurality of times Generating the fifth image data having the third number of bits and having the second frame rate by outputting, and the second image data does not correspond to a still image In the case, the fourth image data Adding the fifth image data to generate sixth image data having gradation data of the first bit number and having the second frame rate. And

  According to the present invention, it is possible to provide an image data processing apparatus and an image data processing method that enable high-gradation frame rate conversion using an element for low gradation.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(First embodiment)
FIG. 1 is a block diagram showing an image data processing apparatus 100 according to the first embodiment of the present invention. FIG. 2 is a schematic diagram showing image data processed by the image data processing apparatus 100. The image data processing apparatus 100 converts image data with a first frame rate (low frame rate) into image data with a second frame rate (high frame rate) and displays the image data. Here, the frame rate is converted to double speed from 60 Hz to 120 Hz, for example.

  The image data processing apparatus 100 includes an input unit 110, an image data dividing unit 120, an inter-frame image processing unit 130, a frame buffer 140, a passage control unit 150, an image data adding unit 160, and a display unit 170. Among these, the input unit 110 and the display unit 170 correspond to image data having a high bit number (for example, each YCbCr has 12 bits (12 bits × 3)). The inter-frame image processing unit 130, the frame buffer 140, and the passage control unit 150 correspond to low-bit number image data (for example, YCbCr is 8 and 4 bits (8 and 4 bits × 3), respectively). The image data dividing unit 120 has a high bit number (for example, 12 bits × 3) on the input side and a low bit number (for example, 8 and 4 bits × 3) on the output side. The image data adding unit 160 has a low bit number (for example, 8 and 4 bits × 3) on the input side and a high bit number (for example, 12 bits × 3) on the output side. In “YCbCr”, “Y” indicates a luminance signal (brightness), “Cb” indicates a blue color difference signal, and “Cr” indicates a red color difference signal.

The input unit 110 is connected to, for example, a tuner or a video device, and inputs image data D1 (video signal). The image data D1 has a high gradation (for example, each of YCbCr has a 12-bit gradation (12 bits × 3)) and a low frame rate (for example, 60 Hz). In FIG. 2, the image data D1 of the reference frame F0 at a frame rate of 60 Hz is divided into YCbCr, and “Y ₆₀ [11: 0], Cb ₆₀ [11: 0], Cr ₆₀ [11: 0]” are obtained. Represents. Here, the subscripts Y, Cb, and Cr represent the frame rate [Hz]. The image data D1 may be either a moving image or a still image. In the case of a moving image, the image data D1 varies depending on the frame F. In the case of a still image, the image data D1 does not change due to the frame F.

  The image data division unit 120 divides the image data D1 into two sets of image data D2a and D2b. The data division unit divides the first image data to generate second and third image data. Function as.

Each of the image data D2a and D2b is obtained by dividing the gradation data of the image data D1 into upper bits and lower bits (for example, upper 8 bits and lower 4 bits). In FIG. 2, the image data D2a and D2b of the frame F ₀ are divided into YCbCr, and “Y ₆₀ [11: 4], Cb ₆₀ [11: 4], Cr ₆₀ [11: 4]”, and “Y ₆₀ [3: 0], Cb ₆₀ [3: 0], Cr ₆₀ [3: 0] ”.

The inter-frame image processing unit 130 interpolates adjacent frames F ₀ and F ₋₁ of the image data D2a to generate image data D3a with an increased number of frames (conversion from a low frame rate to a high frame rate). . The inter-frame image processing unit 130 functions as a frame interpolation unit that interpolates adjacent frames of the second image data to generate fourth image data.

Using the adjacent frames F ₀ and F ₋₁ , these intermediate frames F _−1/2 are generated and added to the frames F ₀ and F ₋₁ to generate image data D3a. That is, the image data D3a has a high frame rate (for example, 120 Hz). In FIG. 2, the image data D3a of the frame F− _{1 /} 2 at the frame rate of 120 Hz is divided into YCbCr and expressed as “Y ₁₂₀ [11: 4], Cb [11: 4], Cr [11: 4]”. ing. In the case of a moving image, the image data D2a (image data D1) is different in the frames F ₀ and F _−1/2 , and in the case of a still image, the image data D2a (image data D1) is the frames F ₀ and F _{−1. No} change due to _{/ 2} .

  The inter-frame image processing unit 130 outputs a motion signal S that indicates the presence or absence of motion of the image represented by the image data D2a (classification of moving image and still image). For example, the moving image and the still image are classified according to whether or not the absolute value of the motion vector V is larger than a predetermined value, and a motion signal S corresponding to the classification is generated and output.

The motion vector V can be generated from adjacent frames F ₀ and F ₋₁ of the image data D2a. The motion vector V is a vector representing the motion from the reference frame. A motion vector V is generated by comparing adjacent frames F ₀ and F ₋₁ . Specifically, the frame F ₀ is divided into blocks, and the relative position between the blocks having the smallest difference from the previous frame F ₋₁ is the motion vector V. In general, a motion vector V is generated during frame interpolation.

The frame buffer 140 has a memory capacity of 12 bits × 1 frame or more, temporarily holds the image data D2b, and outputs the image data D3b having an increased number of frames by outputting a plurality of times (for example, twice). Generate (conversion from low frame rate to high frame rate). That is, the image data D3b has a high frame rate (for example, 120 Hz). In FIG. 2, image data D3b (frame rate 120 Hz) of an intermediate frame F- _{1 / 2} between adjacent frames F ₀ and F ₋₁ is divided into YCbCr, and “Y ₁₂₀ [3: 0], Cb ₁₂₀ [ 3: 0], Cr ₁₂₀ [3: 0] ”.

  The passage control unit 150 passes the image data D3b when the image data D2a (motion signal S) represents a still image. The passage controller 150 outputs the image signal D0 without passing the image data D3b when the image data D2a represents a moving image (does not represent a still image). The image signal D0 is an image signal in which all the image data is zero, and is represented as “4b0000” (4-bit “0000”) in FIG.

The image data adding unit 160 adds the image data D3b or D0 output from the passage control unit 150 to the image data D3a, and generates and outputs the image data D4 or D5. Image data D4 and D5 are generated corresponding to the image data D3b and D0. In FIG. 2, the image data D4 of the frame F- _{1 / 2} is Y = “Y ₁₂₀ [11: 4], Y ₁₂₀ [3: 0]”, Cb = “Cb ₁₂₀ [11: 4], Cb ₁₂₀ [3 : 0] ”, Cr =“ Cr ₁₂₀ [11: 4], Cr ₁₂₀ [3: 0] ”. Further, the image data D5 of the frame F- _{1 / 2} is changed to Y = “Y ₁₂₀ [11: 4], 4b0000”, Cb = “Cb ₁₂₀ [11: 4], 4b0000”, Cr = “Cr ₁₂₀ [11: 4]. ], 4b0000 ". These include, for _example, Y 120: _Y 120 as the lower bits in the 11 4] [3: 0] by adding indicating that back to 12 bits. That is, Y ₁₂₀ [11: 4] is shifted by 4 bits, and Y ₁₂₀ [3: 0] is added.

  When the image data D2a is a still image, the passage control unit 150 and the image data adding unit 160 add the image data D3b to the image data D3a, and generate and output the image data D4. When the image data D2a is not a still image, the image data D3b is not added to the image data D3a, and the image data D5 is generated and output. The passage control unit 150 and the image data adding unit 160 generate the sixth image data by adding the fifth image data to the fourth image data when the second image data corresponds to the still image. Functions as a data appending unit.

For the following reason, the presence or absence of addition is different between the moving image and the still image. Image data D3a is generated from the image data D2a by the motion vector processing in the inter-frame image processing unit 130. At this time, since there is no motion vector in the case of a still image, the same image data as the previous frame F- ₁ is repeated as the intermediate frame F- _{1 / 2} to generate image data D3a. For a moving image, interpolated image data D3a is generated according to the motion vector. On the other hand, the same pixel data as the previous frame F- ₁ is repeated as the intermediate frame F- _{1 / 2} in the frame buffer 140, and the image data D3b is generated from the image data D2b.

As a result, in the case of a still image, the image data adding unit 160 adds the image data D3b to the image data D3a, thereby obtaining the same effect as the inter-frame image processing unit 130 having a higher number of bits (12 bits × 3). It is done. In the case of a moving image, the intermediate frame F- _{1 / 2} of the image data D3a does not coincide with the previous frame F- _1. Therefore, the image data D3b is not added and the low bit (8 bits × 3) precision is maintained.

  By processing in this way, a still image portion that is easily noticeable to the viewer is displayed at a high gradation with multiple bits in a delicate gradation portion such as sky or human skin. On the other hand, since the motion of the afterimage or the like is more noticeable to the viewer than the bit gradation in the moving image portion, the gradation accuracy may be kept low.

  The display unit 170 is a display device that displays an image based on the image data D4 or the image data D3b output from the image data adding unit 160, for example, a liquid crystal display device.

(Operation of Image Data Processing Device 100)
Hereinafter, the operation of the image data processing apparatus 100 will be described.

(1) Input of image data D1 Image data D1 is input from the input unit 110.

(2) Division of Image Data D1 The image data division unit 120 divides the image data D1, and image data D2a and D2b are generated.

(3) Frame rate conversion of each of image data D2a and D2b The frame rate of each of image data D2a and D2b is converted as follows.
a. The inter-frame image processing unit 130 interpolates adjacent frames of the image data D2a to generate high frame rate image data D3a.
b. The frame buffer 140 holds the image data D2b and outputs it a plurality of times, thereby generating high frame rate image data D3b.

(4) Addition of image data D3b to image data D3a When image data D2a is a still image, passage control unit 150 and image data addition unit 160 add image data D3b to image data D3a, and image data D4 Generated and output. When the image data D2a is a moving image, the image data D3b is not added to the image data D3a. As described above, by changing the presence / absence of data addition in accordance with still images and moving images, a subtle gradation portion in the still image portion is displayed with high gradation by multi-biting.

(Second Embodiment)
A second embodiment of the present invention will be described.
FIG. 3 is a block diagram showing an image data processing apparatus 200 according to the second embodiment of the present invention. FIG. 4 is a schematic diagram showing image data processed by the image data processing device 200. The image data processing device 200 receives, for example, a video signal (image data D1) from a tuner, a video device, and the like, and performs high-precision first frame rate (low frame rate) image data by motion vector processing or the like. The image data is converted into image data having a frame rate of 2 (high frame rate) and displayed. The image data processing apparatus 200 further generates an OSD (On Screen Display) image signal (image data Dα6) such as a menu screen or a channel banner, and repeatedly outputs the signal from the first frame rate (low frame rate) to the second. Frame rate (high frame rate), and the video signal and the OSD image signal are combined and displayed. Here, the frame rate is converted to double speed from 60 Hz to 120 Hz, for example.

  The image data processing device 200 includes an input unit 110, an image data division unit 120, an inter-frame image processing unit 130, a frame buffer 240, a passage control unit 250, an image data addition unit 160, a display unit 170, an image generation unit 281, a blend ratio. A separation unit 282a, a blend ratio addition unit 282b, a blend ratio detection unit 283, a switching unit 284, and an image composition unit 290 are included. The image composition unit 290 corresponds to image data having a high bit number (for example, each YCbCr has 12 bits (12 bits × 3)). The frame buffer 240, the passage control unit 250, the image generation unit 281, the blend ratio separation unit 282a, the blend ratio addition unit 282b, the blend ratio detection unit 283, and the switching unit 284 have a low bit number (for example, 8 bits each for YCbCr (8 This corresponds to the image data of bit × 3)).

  The image generation unit 281 generates image data Dα6. Image data Dα6 includes information on blend ratio α and image data D6. The blend ratio (combination ratio) α takes a value of 0 to 255, for example, if it is 8-bit digital data, and a ratio (image) when the image composition unit 290 composites (superimposes) other image data with the image data D6. The degree of transmission of the image represented by the data D6). When the blend ratio α is 255, it is completely opaque (no other image is seen under the image represented by the image data D6), and when it is 0, it is completely transparent (the image represented by the image data D6 is seen). No), the image data D6 is not included in the combined image data. The image data D6 represents, for example, a graphic image (OSD image signal) for displaying a menu used for a user operation.

In FIG. 4, the image data Dα6 of the reference frame F ₀ at a frame rate of 60 Hz is divided into αYCbCr, and “α ₆₀ [7: 0], GY ₆₀ [7: 0], GCb ₆₀ [7: 0], GCr ₆₀ [7: 0] ”. Further, the image data D6 of the frame F ₀ is expressed as “GY ₆₀ [7: 0], GCb ₆₀ [7: 0], GCr ₆₀ [7: 0]”.

The blend ratio separation unit 282a separates the image data Dα6 into image data D6 and blend ratio α information.
The blend ratio adding unit 282b adds the information of the blend ratio α to the image data D2b or D6 output from the switching unit 284, and generates image data Dα2b or Dα6. In FIG. 4, the image data Dα2b of the reference frame F ₀ is divided into YCbCr, and “α ₆₀ [7: 0], Y ₆₀ [3: 0], Cb ₆₀ [3: 0], Cr ₆₀ [3 : 0] ”. Since the bit numbers of the image data D2b and D6 are different, a part of the image data Dα2b is empty (zero, “−” in FIG. 4).

The blend ratio detection unit 283 detects whether or not the blend ratio α is 0 (not synthesized).
The switching unit 284 switches and outputs the image data D2b and D6 based on the detection result of the blend ratio detection unit 283. The switching unit 284 switches the object to be written to the frame buffer 240 by outputting the image data D2b when the blend ratio α is 0, and outputting the image data D6 otherwise. When the blend ratio α is 0, the image data D6 is not used for composition by the image composition unit 290 described later, and therefore it is not necessary to store the image data D6 in the frame buffer 240.

The frame buffer 240 is different in the memory capacity from the frame buffer 140 in that the processing includes the blend ratio α information and the number of bits of the YCbCr image is different, and a memory capacity of 32 bits × 1 frame or more is required. It is. The frame buffer 240 temporarily holds the image data Dα2b or Dα6, and outputs the image data Dα3b or Dα7 with an increased number of frames by outputting a plurality of times (for example, twice) (from low frame rate to high Conversion to frame rate). That is, the image data Dα3b and Dα7 have a high frame rate (for example, 120 Hz). In FIG. 4, the image data Dα3b of the frame F− _{1 / 2} at the frame rate of 120 Hz is divided into YCbCr, and “α ₁₂₀ [7: 0], Y ₁₂₀ [3: 0], Cb ₁₂₀ [3: 0], Cr ₁₂₀ [3: 0] ”. The image data Dα7 of the frame F− _{1 / 2} is expressed as “α ₁₂₀ [7: 0], GY ₁₂₀ [7: 0], GCb ₁₂₀ [7: 0], GCr ₁₂₀ [7: 0]”.

  The passage control unit 250 is different from the passage control unit 150 in that processing is performed including information on the blend ratio α. The passage control unit 250 passes the image data D3b in the image data Dα3b when the image data D2a (motion signal S) represents a still image and the blend ratio α is 0. If the image data D2a represents a moving image (does not represent a still image) or the blend ratio α is other than 0, the passage control unit 250 outputs the image signal D0 without passing through the image data D3a. The image signal D0 is an image signal in which all the image data is zero, and is represented as “4b0000” (4-bit “0000”) in FIG.

  By these operations, only when the blend ratio α is 0, the frame buffer 240 is used for the high frame rate conversion processing from the 60 Hz image data D2b to the 120 Hz image data D3b, and the passage control unit 250 uses the first embodiment. Similarly, the image data D3b or DO is output according to the motion signal S.

  When the image data D2a is a still image and the blend ratio α is 0, the passage control unit 250 and the image data adding unit 160 add the image data D3b to the image data D3a, and generate and output the image data D4. If the image data D2a is not a still image or the blend ratio α is not 0, the image data D3b is not added to the image data D3a, and the image data D5 is generated and output. The passage control unit 250 and the image data adding unit 160 add the fifth image data to the fourth image data when the second image data does not correspond to the still image and the composition ratio is not synthesized. Thus, it functions as a data adding unit that generates sixth image data.

  The image composition unit 290 synthesizes (superimposes) the image data D4 or D5 having a higher bit (12 bits × 3) from the image data addition unit 160 and the image data D3b or D7 from the frame buffer 240 according to the blend ratio α. To do.

  Here, in the case of a still image with a blend ratio α = 0, image data D4 is input from the image data adding unit 160 and image data Dα3b is input from the frame buffer 240 to the image combining unit 290. Since the blend ratio α = 0, the image data D4 from the image data adding unit 160 is output as it is. In the case of a moving image with a blend ratio α = 0, image data D5 is input from the image data adding unit 160 and image data Dα3b is input from the frame buffer 240 to the image combining unit 290. Since the blend ratio α = 0, the image data D5 from the image data adding unit 160 is output as it is. When the blend ratio α ≠ 0, the image data D5 is input from the image data addition unit 160 and the image data Dα7 is input from the frame buffer 240 to the image composition unit 290 regardless of the moving image / still image. At this time, image data D8 obtained by combining image data D5 and Dα7 according to the blend ratio α is output.

  Since the input unit 110, the image data dividing unit 120, the inter-frame image processing unit 130, the image data adding unit 160, and the display unit 170 of the image data processing apparatus 200 are substantially the same as those of the image data processing apparatus 100, description thereof is omitted.

(Operation of Image Data Processing Device 200)
Hereinafter, the operation of the image data processing apparatus 200 will be described.

(1) Input of image data D1 and generation of image data Dα6 Image data D1 is input from the input unit 110.
In parallel with this input, the image generation unit 281 generates image data Dα6 for synthesis (superimposition).

(2) Division of Image Data D1 The image data division unit 120 divides the image data D1, and image data D2a and D2b are generated.

(3) Switching of image data D2b and D6 Depending on whether or not the blend ratio α is 0, either image data D2b or D6 (Dα2b or Dα6) is selected and input to the frame buffer 240.

(4) Frame rate conversion of image data D2a, D2b, D6 The frame rate of the image data D2a, D2b, D6 is converted as follows.
a. The inter-frame image processing unit 130 interpolates adjacent frames of the image data D2a to generate high frame rate image data D3a.
b. The frame buffer 240 holds the image data Dα2b or Dα6 and outputs it multiple times, thereby generating high frame rate image data Dα3b or Dα7.

(5) Addition of image data D3b to image data D3a When image data D2a is a still image and blend ratio α is 0, passage control unit 250 and image data addition unit 160 add image data D3b to image data D3a. Then, image data D4 is generated and output. When the image data D2a is a moving image or the blend ratio α is other than 0, the image data D3b is not added to the image data D3a. As described in the first embodiment, by changing the presence / absence of data addition in accordance with still images and moving images, subtle gradation portions in the still image portions are displayed with high gradation by multi-biting. .

  When the blend ratio α is other than 0, the image data Dα7 corresponding to the image data Dα6 generated by the image generation unit 281 is output from the frame buffer 240, and the image data D5 and the image data Dα7 are output according to the blend ratio α. The combined image data D8 is displayed. In a state where an OSD image such as a menu is displayed on the video, the viewer only needs to see the image such as the menu, so the gradation accuracy is sufficient with the conventional low bit.

(Other embodiments)
Embodiments of the present invention are not limited to the above-described embodiments, and can be expanded and modified. The expanded and modified embodiments are also included in the technical scope of the present invention.

It is a block diagram showing the image data processing device concerning a 1st embodiment. It is a schematic diagram showing the image data processed with the image data processing apparatus which concerns on 1st Embodiment. It is a block diagram showing the image data processing apparatus which concerns on 2nd Embodiment. It is a schematic diagram showing the image data processed with the image data processing apparatus which concerns on 2nd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100 ... Image data processing apparatus, 110 ... Input part, 120 ... Image data division part, 130 ... Inter-frame image processing part, 140 ... Frame buffer, 150 ... Pass control part, 160 ... Image data addition part, 170 ... Display part, DESCRIPTION OF SYMBOLS 200 ... Image data processing apparatus, 240 ... Frame buffer, 250 ... Pass control part, 281 ... Image generation part, 281 ... Image generation part, 282a ... Blend ratio separation part, 282b ... Blend ratio addition part, 283 ... Blend ratio detection part 284 ... Switching unit, 290 ... Image composition unit

Claims (6)

Second image data having gradation data of a first bit number, dividing first image data of a first frame rate, and having gradation data of a second bit number; A data dividing unit for generating third image data having gradation data of the number of bits;
By interpolating adjacent frames of the second image data, fourth image data having the second number of bits of gradation data and having a second frame rate greater than the first frame rate is obtained. A frame interpolation unit to generate;
A frame buffer that holds the third image data and outputs the plurality of times to generate the fifth image data of the second frame rate and having the gradation data of the third number of bits; ,
When the second image data corresponds to a still image, the fifth image data is added to the fourth image data to have the first bit number of gradation data, and A data adding unit that generates sixth image data having a frame rate of 2;
An image data processing apparatus comprising: An image generation unit for generating seventh image data of the first frame rate, which is displayed by being combined with other image data corresponding to the combination ratio;
A switching unit that switches and outputs one of the third and seventh image data based on the presence or absence of the synthesis represented by the synthesis ratio;
The frame buffer holds the third image data and the seventh image data output from the switching unit and outputs the plurality of times, so that the fifth image data of the second frame rate and Generate any of the eighth image data,
In the case where the second image data corresponds to a still image and the composition ratio represents that the composition ratio is not composed, the data adding unit adds the fifth image data to the fourth image data, Generating the sixth image data;
The image data processing apparatus according to claim 1. A synthesis unit for synthesizing the sixth and eighth image data based on the synthesis ratio;
The image data processing apparatus according to claim 2, further comprising: When the second image data does not correspond to a still image, the data adding unit does not add the fifth image data to the fourth image data, and converts the gradation data of the first number of bits. And generating ninth image data of the second frame rate,
The image data processing apparatus according to claim 1. A display unit for displaying an image based on the sixth image data;
The image data processing apparatus according to claim 1, further comprising: Second image data having gradation data of a first bit number, dividing first image data of a first frame rate, and having gradation data of a second bit number; Generating third image data having gradation data of the number of bits;
By interpolating successive frames of the second image data, fourth image data having the second number of bits of gradation data and having a second frame rate greater than the first frame rate is obtained. Generating step;
Temporarily storing and outputting the third image data to generate fifth image data having the third number of bits and having the second frame rate; ,
When the second image data corresponds to a still image, the fifth image data is added to the fourth image data to have the first bit number of gradation data, and Generating sixth image data at a frame rate of 2;
An image data processing method comprising:

Images