JP2012060423A - Video encoder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video encoder capable of suppressing deterioration in image quality by avoiding a decrease in encoding efficiency at the time of a scene change.SOLUTION: A scene change detector 104 configures a selection switching unit for selecting between an intra-macro block and an inter-macro block in the configuration of an encoder for performing encoding processing in accordance with an H.264 standard. The scene change detector 104 forms a prediction-encoded screen obtained after detecting a scene change by: gradually moving a region of the intra-macro block occupying a specific region from one end to another end and allotting the region in which the intra-macro block has passed to a region of the inter-macro block; and continuing wiping processing in a form that skips the encoding processing on a partial region to which the region of the intra-macro block has not reached, until the region of the inter-macro block occupies an entire region of the screen. After the prediction-encoded screen is formed, a normal prediction-encoded screen forming process is resumed.

Description

  The present invention relates to a moving picture coding apparatus that performs coding processing of moving picture data in accordance with a moving picture coding standard.

  In recent years, the transmission amount of moving image data has been increasing. Here, the amount of transmission data when the NTSC (National Television System Committee) video signal is encoded is as follows.

  The number of pixels constituting one frame is 720 pixels in the horizontal direction and 480 pixels in the vertical direction. Each of these pixels is represented by 8 bits of luminance data and 2 color difference data of 8 bits. A moving image for one second includes 30 screens (frames).

At present, half of each of the color components (two color difference signals) is assigned to the luminance component data in the vertical and horizontal directions. Therefore, the amount of data per second is
720 × 480 × (8 + 8 × 1/2 × 1/2 + 8 × 1/2 × 1/2) × 30 = 1244416000 bits. That is, the transmission rate is about 120 Mbps.

  However, even an optical fiber that is currently popular as home broadband is about 100 Mbps, and cannot transmit video without compression. In Japan, television broadcasting will switch to terrestrial digital broadcasting in 2011. The amount of data in terrestrial digital broadcasting is said to be 1.5 Gbps, and high-efficiency compression technology is expected to become even more important in the future.

  Currently, the H.264 standard is a highly efficient moving image compression coding standard. H.264 / AVC (hereinafter referred to as H.264).

H. H.264 is an international standard organization for telecommunications, ITU-T (International
Video Coding Experts Group (VCEG), which is a video coding expert group of Telecommunication Union-Telecommunication Standardization Sector, and MPEG, which is a video coding expert group of ISO (International Organization for Standardization) / IEC (International Electrotechnical Commission). It is the latest international standard for moving picture coding developed by JVT (Joint Video Team) jointly established in December 2001 by the Moving Picture Expert Group.

  ITU-T approved in May 2003 as a recommendation. In 2003, ISO / IEC JTC 1, which is the first joint technical committee, was standardized as MPEG4 part-10: Advanced Video Coding (AVC).

  In addition, expansion work related to color space and pixel gradation has been carried out, and a final standard draft was created in July 2004 as Fidelity Range Extension (FRExt).

H. The main features of H.264 are as follows.
The same level of image quality can be realized with a coding efficiency about twice that of conventional MPEG-2 and MPEG-4.
Compression algorithm: Inter picture prediction, quantization, entropy code is adopted.
-It can be used in a wide range from low bit rates such as mobile phones to high bit rates such as high-definition televisions.

  As described above, various discussions have been made on the moving picture coding technology today. H.265 standardization work is also underway.

  Next, referring to the drawings, H.C. The video encoding process by H.264 will be described in detail.

  FIG. 2 is a functional block diagram illustrating a configuration of a general encoder in H.264. H. In the encoder 300 that performs the processing of H.264, the moving image data supplied to the input terminal 301 generates a predicted image based on a plurality of screens and an in-screen prediction unit 302 that generates a predicted image within one screen. It is supplied to one input terminal of the inter-screen prediction unit 303.

  The moving image data supplied to the input terminal 301 is H.264. The image data blocks that have been converted into macroblocks by FMO (Flexible Macroblock Ordering) defined in H.264 are passed through a frame buffer for enabling reading of arbitrary blocks, and are attached to subsequent processing for each macroblock. However, this frame buffer is omitted in FIG. The description of FMO is also omitted.

  The intra-screen prediction process executed by the intra-screen prediction unit 302 and the inter-screen prediction process executed by the inter-screen prediction unit 303 are both H.264 and H.264. The process is as defined in H.264, and each obtains predicted image data.

  Predicted image data selected via the selection switching unit 304 is supplied to the differentiator 305 from the predicted image data obtained by the intra-screen prediction unit 302 and the inter-screen prediction unit 303, and is supplied from the input terminal 301 here. A difference from the moving image data is obtained. The processing in the differentiator 305 is executed in such a manner that a difference is obtained for the data divided for each macroblock for the above-described predicted image data and moving image data to obtain difference image data.

  The difference image data that is the output of the difference unit 305 is subjected to orthogonal transformation such as discrete cosine transformation (DCT) in the orthogonal transformer 306, then quantized in the quantizer 307, and further encoded in the encoder 308. And an encoded image data stream which is moving image encoded output data is obtained as an output of the encoder 308.

  On the other hand, the data quantized by the quantizer 307 is inversely quantized by the inverse quantizer 309, then inverse DCT transformed by the inverse orthogonal transformer 310, and further, the predicted image data is added by the adder 311. Thus, restored image data is obtained.

  On the one hand, the restored image data is supplied to the other input terminal of the intra prediction unit 302 as one input data for performing the intra prediction process, and on the other hand, it is temporarily stored in the memory 313 through the filter 312. Then, image data corresponding to a period retroactive by a plurality of frames from the arrival time point of the frame of the moving image data supplied to the input terminal 301 among the accumulated image data is read out, and the other of the inter-screen prediction unit 303 is read out. It is supplied to the input terminal and used for inter-screen prediction processing.

  H. H.264 realizes high encoding efficiency and transmission efficiency by encoding and transmitting only differential image data as described above.

  Here, the intra-screen prediction process executed by the intra-screen prediction unit 302 is a method of generating a predicted image using the correlation between adjacent pixels. In this intra prediction process, data representing a pixel to be predicted is generated by correlation with its surrounding pixels, and pixels from the left to the upper right of the prediction target block are used.

  Next, the intra-screen prediction process will be further described with reference to FIG.

  FIG. 4 is a diagram for explaining the intra-screen prediction process when predictive image generation is performed by the intra-screen prediction process in units of 4 × 4 pixels as an example.

  A-M in FIG. 4 is a reference pixel used for prediction. H. In H.264 / AVC, a block unit of 4 × 4 pixels (hereinafter: 4 × 4 blocks), a block unit of 8 × 8 pixels (hereinafter: 8 × 8 blocks), and a block unit of 16 × 16 pixels (hereinafter: 16 × 16 blocks) ) Can generate a predicted image. For these block units, as the applicable intra-screen prediction processing modes, a total of 22 modes of 9 modes each for 4 × 4 blocks and 8 × 8 blocks and 4 modes for 16 × 16 blocks can be applied. It is.

  Next, the inter-screen prediction process will be described with reference to FIG.

  As shown in FIG. 5, inter-screen prediction is performed on a picture P501 (time t = 0) to be predicted, a picture (reference block) P500 (time t = −1) and a picture (reference block) P502 (previous time). This is a process for generating a predicted image from time t = 1). That is, in inter-screen prediction, a motion vector of a prediction target pixel is calculated from the previous and subsequent pictures, and a predicted image is generated.

  As explained above, H.P. H.264 makes full use of various methods, and has come to be standardized as a moving picture compression technique with higher efficiency than MPEG1, 2 and the like.

Here, the inter-screen prediction will be further described with reference to FIG.
In FIG. 6, the flow of a general encoding process is shown along a time axis, and for convenience of explanation, six pictures are simply illustrated. In this example, the first picture I0 is encoded by intra prediction processing, and the subsequent pictures P1 to P5 are encoded by inter prediction processing. At this time, it is assumed that the picture P5 is generated as a predicted image using P4 as a reference image. If a scene change occurs at the time between both pictures P4 and P5, the temporal correlation between the two pictures is lost. For this reason, the accuracy of inter-screen prediction is lowered, and there is a problem that image quality deterioration continues for a while after a scene change. To solve such a problem, a method of inserting an IDR (Instantaneous Decoder Refresh) picture that performs encoding using intra prediction when a scene change is detected has been proposed (see Patent Document 1).

JP 2007-184909 A

  However, the amount of code generated by intra prediction is larger than inter prediction, and even if an IDR picture is inserted when a scene change is detected as in the method proposed in Patent Document 1, encoding efficiency is lowered, and image quality is deteriorated. There is a risk of coming.

  The present invention avoids a decrease in coding efficiency at the time of a scene change and suppresses the image quality deterioration with respect to the conventional problem that the encoding efficiency is lowered at the time of a scene change and image quality is deteriorated. An object is to provide an image encoding device.

In order to achieve the above object, the present application proposes the following moving picture encoding apparatus.
(1) A prediction screen formed by switching and applying a moving image to be encoded by switching between an intra macroblock by intra prediction processing and an inter macro block by inter prediction processing, and the prediction in the moving image A video encoding device that encodes a difference between a screen and a screen corresponding to a screen by performing an encoding process by an encoder,
The intra macroblock detects a scene change in the moving image, and gradually moves the region of the intra macroblock that occupies a certain region from one end side to the other end side of the predictive coding screen after the scene change is detected. Wipe in a form in which the area after passing is allocated with the area of the inter macro block and the encoding process control signal is supplied to the encoder to skip the encoding process of the partial area where the area of the intra macro block has not yet reached. A scene change detection unit that is formed by continuing the process until the area of the inter-macroblock reaches the entire screen;
The encoder skips the encoding process of the partial area where the area of the intra macroblock has not yet reached during the wipe process according to the encoding process control signal supplied from the scene change detection unit. A moving image encoding apparatus that executes processing.

  In the moving image encoding apparatus of (1), since the formation of the encoded screen after the scene change is executed by the above-described wiping process, the scene change is performed slowly, and the image quality deteriorates at the time of the scene change in the moving image encoding. Is effectively avoided.

  In addition, the amount of generated code is suppressed as compared to a method of inserting an intra-coded screen (I picture) by intra prediction processing after a scene change.

  According to the moving image encoding apparatus of the present invention, the amount of generated code is suppressed and image quality deterioration is also suppressed as compared with a method of inserting an intra-encoded screen (I picture) by intra prediction processing after a scene change. It is possible to realize a moving image encoding apparatus.

It is a functional block diagram showing the structure of the moving image encoder of this invention. It is a figure for demonstrating the flow of a process in the apparatus of FIG. H. 2 is a functional block diagram of a general encoder in H.264. H. 2 is a diagram for describing intra-screen prediction processing in H.264. H. 2 is a diagram for describing inter-screen prediction processing in H.264. H. 2 is an example showing a flow of inter-screen prediction processing in H.264.

Hereinafter, the present invention will be clarified by describing in detail a moving picture coding apparatus as an embodiment of the present invention with reference to the drawings.
(Configuration of video encoding apparatus of the present invention)
FIG. 1 is a functional block diagram showing the configuration of a moving picture encoding apparatus as one embodiment of the present invention.

  In the moving image encoding apparatus 100 of FIG. 1, moving image data to be encoded is supplied to the input terminal 101.

  The moving image data supplied to the input terminal 101 is H.264. Each of the macroblocks is subjected to subsequent processing through a frame buffer (not shown) so that an arbitrary macroblock can be read out from the image data macroblocked by the FMO defined in H.264. However, since this part of the process itself is known, the following description will be made as a process related to moving image data or image data by simplifying as appropriate.

  The moving image data supplied to the input terminal 101 is supplied to one of the input terminals of the intra-screen prediction unit 102 and the inter-screen prediction unit 103.

  The intra-screen prediction unit 102 executes an intra-screen prediction process that generates a predicted image within one screen, and the inter-screen prediction unit 103 executes an inter-screen prediction process that generates a predicted image based on a plurality of screens. .

  The intra-screen prediction process executed by the intra-screen prediction unit 102 and the inter-screen prediction process executed by the inter-screen prediction unit 103 are both H.264. This is a process defined in H.264.

  Each predicted image data obtained by the intra-screen prediction unit 102 and the inter-screen prediction unit 103 is supplied to the differentiator 105 via the scene change detection unit 104.

  The difference unit 105 obtains the difference between the moving image data supplied from the input terminal 101 and each predicted image data. More specifically, the processing in the subtractor 105 is executed in such a manner that a difference is obtained for data divided for each macroblock for each predicted image data and moving image data to obtain difference image data.

  The difference image data output from the difference unit 105 is subjected to orthogonal transformation such as discrete cosine transformation (DCT) in the orthogonal transformer 106, then quantized in the quantizer 107, and further coded in the encoder 108. It becomes. Then, an encoded image data stream which is moving image encoded output data is obtained as an output of the encoder 108.

  As will be described later, in this embodiment, the operation of the encoder 108 is controlled by the encoding process control signal SC supplied from the scene change detection unit 104.

  On the other hand, the data quantized by the quantizer 107 is inversely quantized by an inverse quantizer 109, then inverse DCT transformed by an inverse orthogonal transformer 110, and further, predicted image data is added by an adder 111. Thus, restored image data is obtained.

  On the one hand, this restored image data is supplied to the other input terminal of the intra prediction unit 102 as one input data for performing the intra prediction process, and on the other hand, it is temporarily stored in the memory 113 through the filter 112. Of the accumulated image data, image data corresponding to a period retroactive by a plurality of frames from the arrival point of the frame of the moving image data supplied to the input terminal 301 is read out, and the other of the inter-screen prediction unit 103 is read out. It is supplied to the input terminal and used for inter-screen prediction processing.

  H. H.264 realizes high encoding efficiency and transmission efficiency by encoding and transmitting only differential image data as described above.

  The intra-screen prediction process executed by the intra-screen prediction unit 102 is as described above with reference to FIG.

  Further, the inter-screen prediction process executed by the inter-screen prediction unit 103 is as described above with reference to FIG.

  Detection of a scene change in the scene change detection unit 104 can be executed by applying a known method disclosed in, for example, Japanese Patent Laid-Open No. 9-214975.

  As will be described later, in this embodiment, when the scene change detection unit 104 detects a scene change, an intra macroblock (16 pixels × 16 pixels) encoded using intra prediction is placed in a certain area from the left end of the screen. Insert and skip other macroblocks.

  In addition, by moving the above-described intra-macroblock in a certain area toward the right end of the screen, the scene is gradually changed to effectively avoid the image quality deterioration at the time of the scene change in the moving image coding.

Note that the above-described skip is performed by supplying the encoding process control signal SC generated based on the scene change detection by the scene change detecting unit 104 to the encoder 108 and controlling the processing operation in the encoder 108. Executed.
(Processing flow in the video encoding device)
Next, with reference to FIG. 2, the flow of processing in the video encoding device 100 of FIG. 1 will be described.

  FIG. 2 is a conceptual diagram for explaining the flow of the moving image encoding process in the moving image encoding apparatus of FIG.

  In FIG. 2, regarding the transition of time-series sequential pictures (image data) in a moving image, a picture in a state immediately before a time point t1 when a scene change is detected is denoted as picture-1, and each of the subsequent pictures Each picture at time points t2, t3, t4,..., Tm, tm + 1 is denoted as picture 0, picture 1, picture 2,.

  When the scene change detection unit 104 detects a scene change (t1), when the first picture after the scene change is first encoded, intra-screen prediction is performed from the screen end (left side end in the illustrated example) to a certain partial region. The screen of the predicted image is configured by applying the intra macroblock (16 pixels × 16 pixels) that is the image obtained by the processing (t2: picture 0).

  In the picture 0 screen of FIG. 2, a certain partial region (a portion formed by applying an intra macroblock) of an image obtained by intra prediction processing is denoted as “I”. The remaining macroblocks on the picture 0 screen are processed so as to be skipped.

  The skipping process as described above is executed by controlling the operation of the encoder 108 by the encoding process control signal SC supplied from the scene change detection unit 104 to the encoder 108.

  At the next time point t3, for a certain partial region to which the intra macroblock is applied in the picture 0 described above, this partial region has moved to the right. Then, for a region after a certain partial region to which the intra macroblock is applied by the movement to the right passes, an inter macroblock that is an image by inter-screen prediction processing is applied and applied to this region. As a result, a certain partial area to which the intra macroblock in the previous picture 0 is applied moves to the right side of the screen and occupies a certain partial area adjacent to the right side of the area to which the inter macroblock is allocated after the movement. A picture 1 screen is formed.

  In the picture 1 screen of FIG. 2, an image portion (a portion formed by applying an inter macroblock) by a new inter-screen prediction process is denoted as “P”, and an adjacent inter macroblock is applied to the right side thereof. This area is indicated as “I”. The remaining macroblocks on the picture 0 screen are processed by the encoder 108 so as to be skipped.

  As described above, the skipping process is executed by controlling the operation of the encoder 108 by the encoding process control signal SC supplied from the scene change detection unit 104 to the encoder 108.

  Further, at the next time point t4, a certain partial area to which the intra macroblock is applied moves further to the right side of the screen. After this movement, for a certain partial area refreshed by applying an intra macroblock in picture 1 described above, an inter macroblock is applied and applied to this partial area. As a result, the screen of picture 2 in which the area allocated by the inter macroblock spreads to the right side twice as wide as before, and a certain partial area adjacent to the right side occupies a certain partial area to which the intra macroblock is applied. Is formed.

  In the picture 2 screen of FIG. 2, the expanded area formed by applying the inter macroblock is denoted by “P”, and the area to which the adjacent intra macroblock is applied on the right side is denoted by “I”. Yes. The remaining macroblocks on the picture 0 screen are processed so as to be skipped.

  Also in the above-described case, the skipping process is executed by controlling the operation of the encoder 108 by the encoding process control signal SC supplied from the scene change detection unit 104 to the encoder 108.

  The screen formation processing in time series of picture 0, picture 1, picture 2,..., Picture n as described above is sequentially moved to the right side of the screen by moving a certain partial area formed by applying intra macroblocks. Execute (time tm: picture n). Here, the process described with reference to FIG. 2 is referred to as a “wipe process”, and in the figure, the period during which the wipe process is applied is indicated by “wipe process” along the arrow line.

  Then, the wipe process ends when the area of the inter macro block reaches the entire screen.

  In the present embodiment, after the end of the wipe process, the H.D. Transition to normal processing according to the H.264 standard (time tm + 1: picture n + 1).

  In the present embodiment, it is possible to use temporal correlation between pictures by encoding a macroblock for which a wiping process has been completed using inter prediction. For this reason, a decrease in prediction accuracy can be suppressed, and the encoding efficiency is deteriorated as compared with a method of inserting an intra-coded screen (I picture) that is a predicted screen by intra-screen prediction processing after a scene change. Can be effectively avoided.

  In the case of horizontal 1920 pixels, when 12 intra-macroblocks are inserted for each picture to form an encoded screen, the wiping process is completed for 10 pictures. This processing time is about 0.1 in the case of a 1920 × 1080 / 59.94i format (1920 × 1080 pixel interlace standard, field frequency 59.94 Hz, frame rate 30 frames per second) in terrestrial digital television. This corresponds to 16 seconds. In general, if this time is used, the sense of incongruity due to the wiping process does not occur in the subjective image quality evaluation.

Further, in this embodiment, H.264 is used. Since the encoding processing conforming to H.264 is performed, the encoded moving image is converted into a general H.264 format. There is an advantage that it can be easily decoded by an H.264 decoder.
(Appendix)
The embodiments of the present invention described above are laid out or summarized as technical ideas which will be exemplified below as additional notes.
(Appendix 1)
H. A prediction screen formed by switching and applying an intra macroblock and an inter macroblock in an encoder that performs encoding processing according to the H.264 standard, and a screen corresponding to the prediction screen in a moving image to be encoded; The selection switching unit in the configuration in which the encoding process is performed by the encoder with respect to the difference is configured as a scene change detection unit having a scene change detection function, and the encoder is supplied from the scene change detection unit. An encoding process control signal is configured to be controllable by an encoding process control signal; and
The scene change detection unit gradually moves the region of the intra macroblock that occupies a certain region from one end side to the other end side of the predictive coding screen after the scene change is detected, and the region after the intra macroblock has passed Is applied in the area of the inter macroblock and the encoding process control signal is supplied to the encoder to skip the encoding process of the partial area that has not reached the area of the intra macroblock. The macroblock area is formed by continuing until it occupies the entire area of the screen. Configured to return to normal predictive coding screen formation processing according to the H.264 standard,
The encoder skips the encoding process of the partial area where the area of the intra macroblock has not yet reached during the wipe process according to the encoding process control signal supplied from the scene change detection unit. Form wipe process, and after the wipe process is completed, The moving picture coding apparatus is configured to return to a state in which normal coding processing according to the H.264 standard is performed.

  In the above moving image encoding apparatus (Appendix 1), since the coding screen after the scene change is formed by the above-described wipe process, the scene change is performed slowly, and the image quality at the time of the scene change in the moving image encoding is Degradation is effectively avoided.

  In addition, the amount of generated code is suppressed as compared to a method of inserting an intra-coded screen (I picture) by intra prediction processing after a scene change.

Further, H.C. Since the encoding processing conforming to H.264 is performed, the encoded moving image is converted into a general H.264 format. There is an advantage that it can be easily decoded by an H.264 decoder.
(Appendix 2)
Corresponds to the prediction screen formed by switching between the intra-macroblock by intra-frame prediction processing and the inter-macroblock by inter-screen prediction processing, and the prediction screen in the video, as the video to be encoded A video encoding method for encoding by executing an encoding process on a difference from a screen to be performed,
The intra macroblock detects a scene change in the moving image, and gradually moves the region of the intra macroblock that occupies a certain region from one end side to the other end side of the predictive coding screen after the scene change is detected. The inter-macro block area occupies the entire screen in a wipe process in which the area after passing is allocated with the area of the inter-macro block and the encoding process of the partial area where the intra-macro block area has not been reached is skipped. A moving picture coding method, characterized in that the coding process is executed so as to be formed by continuing until reaching.

  In the moving image encoding method of (Appendix 2), since the formation of the encoded screen after the scene change is executed by the wipe process described above, the scene change is performed slowly, and the image quality at the time of the scene change in the moving image encoding is Degradation is effectively avoided.

In addition, the amount of generated code is suppressed as compared to a method of inserting an intra-coded screen (I picture) by intra prediction processing after a scene change.
(Appendix 3)
H. In a video encoding method that performs encoding processing according to the H.264 standard, a prediction screen formed by switching and applying an intra macroblock and an inter macroblock, and a screen corresponding to the prediction screen in the video to be encoded And the process of the selection switching unit in the process of executing the encoding process for the difference between and the scene change detection, and
The intra-macroblock area is the area after the intra macroblock passes while the intra-macroblock area occupying a certain area is gradually moved from one end to the other end of the predictive coding screen after the scene change is detected. The wiping process in the form of allocating and skipping the encoding process of the partial area where the intra macroblock area has not been reached is continued until the area of the inter macroblock occupies the entire screen, After forming, the wiping process is terminated and A moving picture coding method characterized by returning to a normal predictive coding screen forming process according to the H.264 standard.

  In the moving image encoding method of (Appendix 3), since the formation of the encoded screen after the scene change is executed by the above-described wipe process, the scene change is performed slowly, and the image quality at the time of the scene change in the moving image encoding is Degradation is effectively avoided.

  In addition, the amount of generated code is suppressed as compared to a method of inserting an intra-coded screen (I picture) by intra prediction processing after a scene change.

  Further, H.C. Since the encoding processing conforming to H.264 is performed, the encoded moving image is converted into a general H.264 format. There is an advantage that it can be easily decoded by an H.264 decoder.

100, 300 ... moving picture coding apparatus 101, 301 ... input unit 102, 302 ... intra prediction unit 103, 303 ... inter prediction unit 104 ... ... scene change detection unit 105, 305 ... differentiators 106, 306 ... Orthogonal transformers 107 and 307 ... Quantizers 108 and 308 ... Encoders 109 and 309 ... Inverse quantizers 110 and 310 ... Inverse orthogonal transformers 111 and 311 ... Adders 112 and 312 ... Filters 113 and 313 ... Memory 304 ……………… Selection switching section

Claims (1)

Corresponds to the prediction screen formed by switching between the intra-macroblock by intra-frame prediction processing and the inter-macroblock by inter-screen prediction processing, and the prediction screen in the video, as the video to be encoded A video encoding device that encodes a difference from a screen to be encoded by executing an encoding process by an encoder,
The intra macroblock detects a scene change in the moving image, and gradually moves the region of the intra macroblock that occupies a certain region from one end side to the other end side of the predictive coding screen after the scene change is detected. Wipe in a form in which the area after passing is allocated with the area of the inter macro block and the encoding process control signal is supplied to the encoder to skip the encoding process of the partial area where the area of the intra macro block has not yet reached. A scene change detection unit that is formed by continuing the process until the area of the inter-macroblock reaches the entire screen;
The encoder skips the encoding process of the partial area where the area of the intra macroblock has not yet reached during the wipe process according to the encoding process control signal supplied from the scene change detection unit. A moving image encoding apparatus that executes processing.

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