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Image reproduction method, image reproduction device, camera system, and reproduction system

A regeneration device and image technology, applied in image communication, digital video signal modification, electrical components, etc., can solve the problems of low cost and power saving, and achieve the effects of low cost, accumulation suppression and power saving

Active Publication Date: 2016-08-17
PANASONIC SEMICON SOLUTIONS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to achieve low cost and power saving in consumer compact cameras and the like for HDTV moving images, which require a high-performance reference image memory.

Method used

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  • Image reproduction method, image reproduction device, camera system, and reproduction system
  • Image reproduction method, image reproduction device, camera system, and reproduction system
  • Image reproduction method, image reproduction device, camera system, and reproduction system

Examples

Experimental program
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no. 1 Embodiment approach

[0056] figure 1 It is a diagram showing the configuration of the image reproduction device 1 according to the first embodiment. In the configuration shown in FIG. 1 , a video data stream to be reproduced is sequentially input to the input terminal 2 . The variable length decoding unit 3 performs variable length decoding on the input video data stream, and outputs various encoding parameters and quantization coefficients. The encoding parameters here include the encoding type (intra / inter) of the macroblock headed by the image type (I / P / B image), the prediction direction category (forward prediction / backward prediction / bidirectional prediction), motion compensation size, and motion vector etc. The inverse quantization / inverse DCT unit 4 performs inverse quantization and inverse DCT transform on the quantized coefficients output from the variable length decoding unit 3 .

[0057] The reference picture memory 5 temporarily stores pictures that have been decoded as reference p...

no. 2 Embodiment approach

[0115] Figure 6 It is a diagram showing the configuration of the image reproduction device 2 according to the second embodiment. exist Figure 6 in, for with figure 1 The same structural elements are assigned to the figure 1 The same symbols are used, and detailed explanations thereof are omitted here. exist Figure 6 In the structure of the present invention, the difference from the first embodiment is that an intermediate buffer memory 202 for temporarily storing the intermediate data decoded in the variable-length decoding unit 3 is added, and an intermediate buffer memory 202 is written into the intermediate buffer memory 202. The intermediate buffer memory control unit 203 for / read control.

[0116] In the case of the first embodiment, decoding for information amount estimation and decoding for reproduction are started at different timings, and the variable length decoding unit 3 is operated exclusively. However, once the variable-length decoding of the video da...

no. 3 Embodiment approach

[0124] Figure 7 It is a flowchart showing the image reproduction method according to the third embodiment. In this embodiment, the processing when pausing or playing back frame by frame is performed during playback of the moving image data stream by the image playback method described in the first and second embodiments will be specifically described.

[0125] The image reproduction method described in the first and second embodiments compresses the reference image only when the amount of information relative to the reference image memory 5 exceeds the allowable memory bandwidth, so it is possible to suppress as much as possible the occurrence of reference image compression caused during decoding. The propagation of the distortion in time. However, when an image reproduction device is constituted by using a reference image memory 5 with a relatively small allowable memory bandwidth, or when a moving image data stream having a large amount of information relative to the referen...

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Abstract

A image reproducing device decodes a moving picture stream having been subjected to inter-picture prediction encoding with a reference image memory accessed. A decoding processor performs variable length decoding of the moving picture stream on a picture-by-picture basis, and outputs an encoding parameter. A traffic analyzer estimates traffic to the reference image memory on the picture-by-picture basis based on the output encoding parameters. A reference image compression controller determines a compression mode in storing a reference image in the reference image memory based on the estimated traffic.

Description

technical field [0001] The present invention relates to image reproduction technology, and in particular to image reproduction for decoding and reproducing a moving image data stream encoded by inter-picture predictive coding that compresses information by reducing redundancy in the time direction. Background technique [0002] In recent years, moving image coding technologies such as MPEG-4 (ISO / IEC 14496-2) or H.264 (ISO / IEC 14496-10) including MPEG-2 (ISO / IEC 13818-2) have been extensively studied, It is used in various fields such as computers, communications, consumer AV equipment, and broadcasting. [0003] In these moving image coding technologies, the amount of information is compressed by using two coding methods, intra-screen predictive coding and inter-picture predictive coding. Among them, intra-screen predictive coding reduces redundancy in the spatial direction on the same screen. Inter-picture predictive coding refers to encoded and decoded images (reference ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/50H04N19/172H04N19/103H04N19/186H04N19/156H04N19/194H04N19/44H04N19/433H04N19/134H04N19/136H04N19/159H04N19/176H04N19/196H04N19/423H04N19/503H04N19/51H04N19/59H04N19/593H04N19/61H04N19/625H04N19/91
CPCH04N19/50H04N19/103H04N19/156H04N19/172H04N19/186H04N19/194H04N19/433H04N19/44
Inventor 北村臣二关征永
Owner PANASONIC SEMICON SOLUTIONS CO LTD
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