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Image Encoding Device, Image Decoding Device, Image Encoding Method, And Image Decoding Method

一种图像编码、图像解码的技术，应用在图像解码装置领域，能够解决信号高频分量损失、影像模糊等问题，达到提高改善精度、提高图像质量的效果

Active Publication Date: 2012-11-28
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] On the other hand, in the method disclosed in Non-Patent Document 1, there is a problem that the higher the compression ratio is, the more the high-frequency components of the signal are lost, and the entire screen is excessively smoothed, resulting in blurred images.

Method used

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  • Image Encoding Device, Image Decoding Device, Image Encoding Method, And Image Decoding Method
  • Image Encoding Device, Image Decoding Device, Image Encoding Method, And Image Decoding Method
  • Image Encoding Device, Image Decoding Device, Image Encoding Method, And Image Decoding Method

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Experimental program
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Embodiment approach 1

[0058] figure 1 It is a configuration diagram showing the image encoding device according to Embodiment 1 of the present invention.

[0059] exist figure 1 Among them, the block dividing unit 1 performs a process of dividing an image signal to be encoded as an input image into units of macroblocks, and outputs the image signals in units of macroblocks to the predicting unit 2 as divided image signals.

[0060] Upon receiving the divided image signal from the block dividing unit 1 , the prediction unit 2 performs intra-frame or inter-frame prediction on the divided image signal to generate a predicted signal.

[0061] In particular, when motion compensation prediction is performed between frames, from the divided image signal and the reference image signal representing the reference image stored in the memory 7, the macroblock itself or the subblock obtained by further finely dividing the macroblock The unit detects a motion vector, and generates a predicted signal indicati...

Embodiment approach 2

[0194] In Embodiment 1 above, it was shown that the filter design processing unit 13 generates a Wiener filter for each category to which one or more regions belong, and for a plurality of blocks (K) constituting a local decoded image, each block The filtering process in the block (K) is performed using the Wiener filter of the class to which the region including the block (K) belongs, but it is also possible to use a Wiener filter generated for each class to which one or more regions belong. , for each block, select the Wiener filter whose sum of the squared errors between the image signal of the coding object in the block (K) and the local decoded image signal becomes the minimum, and use the Wiener filter to The distortion of (K) is compensated.

[0195] Specifically, as follows.

[0196] Figure 11 It is a flowchart showing the processing contents of the loop filter 6 of the image coding device according to Embodiment 2 of the present invention.

[0197] The filter desi...

Embodiment approach 3

[0236] In the above-mentioned second embodiment, it is shown that for a plurality of blocks (K) constituting a decoded image, each block is generated using the Wiener filter generated for each class to which one or more blocks belong in the frame. A method of selecting the case where the sum of the squared errors between the image signal to be coded and the local decoded image signal in the block (K) becomes the smallest in the case of one of the cases and the case of not performing filtering processing, but it is also possible to prepare 1 More than one Wiener filter, from the case of using one of the previously prepared Wiener filters to one of the Wiener filters generated for each category to which one or more blocks belong in the frame. In the case of one or the case of not performing filtering processing, the case where the sum of squared errors between the image signal to be encoded and the locally decoded image signal in the block (K) becomes the smallest is selected.

...

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Abstract

A loop filter (6) is configured from a region classification unit (12) for extracting each of the feature amounts of a plurality of regions that constitute a local decoded image, and classifying classes to which the regions belong according to the feature amounts, and a filter design / processing unit (13) for generating a Wiener filter that minimizes the sum of the square errors between image signals to be encoded and decoded image signals in one or more regions belonging to classes among the plurality of regions that constitute the local decoded image for each of the classes to which the one or more regions belong, and compensating distortion superimposed on the regions using the Wiener filter.

Description

technical field [0001] The present invention relates to an image encoding device and an image encoding method for compressing and encoding an image to be transmitted, and an image decoding device and an image decoding method for decoding an image from encoded data transmitted by the image encoding device. Background technique [0002] Conventionally, in international standard video coding methods such as MPEG and ITU-TH.26x, the input video frame is divided into units of macroblocks consisting of 16×16 pixel blocks, motion compensation prediction is performed, and the prediction error signal is orthogonalized Transform and quantize into block units to perform information compression. [0003] However, if the compression rate is increased, the quality of the prediction reference image used for motion compensation prediction will decrease, thereby hindering the compression efficiency. [0004] Therefore, in the encoding method of MPEG-4AVC / H.264 (see Non-Patent Document 1), t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/32H04N19/117H04N19/119H04N19/136H04N19/137H04N19/139H04N19/147H04N19/174H04N19/176H04N19/189H04N19/196H04N19/46H04N19/463H04N19/50H04N19/503H04N19/593H04N19/61H04N19/625H04N19/70H04N19/82H04N19/85H04N19/91
CPCH04N19/00781H04N19/00151H04N19/00157H04N19/00066H04N7/26058H04N7/26127H04N7/50H04N7/26154H04N7/26313H04N19/00545H04N7/26138H04N19/00896H04N19/00175H04N7/26382H04N19/117H04N19/139H04N19/14H04N19/147H04N19/46H04N19/61H04N19/82H04N19/136H04N19/48H04N19/645G06T7/20H04N19/167H04N19/176H04N19/196H04N19/91
Inventor 峯泽彰关口俊一杉本和夫伊谷裕介守屋芳美日和佐宪道山岸秀一山田悦久加藤嘉明浅井光太郎村上笃道
Owner MITSUBISHI ELECTRIC CORP
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