Image processing method and its processor

An image processing device and image processing technology, which are applied in image data processing, processor architecture/configuration, image enhancement, etc., and can solve problems such as inability to cope with image size changes.

Inactive Publication Date: 2004-05-26
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0051] Therefore, there are cases where image size changes cannot be handled

Method used

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  • Image processing method and its processor
  • Image processing method and its processor
  • Image processing method and its processor

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0119] figure 1 is a block diagram of the image processing device according to Embodiment 1 of the present invention.

[0120] Such as figure 1 As shown, the image processing device includes a processor 1 , an image memory 2 , and a filter processing circuit 3 .

[0121] The processor 1 includes a source memory 10 , a destination memory 11 , and a control unit 12 .

[0122] Next, the overall operation will be briefly described.

[0123] Processor 1 reads encoded image data stored in image memory 2 into source memory 10 .

[0124] The processor 1 performs decoding processing on the image data read into the source memory 10 .

[0125] The processor 1 stores the decoded image data in the destination memory 11 and then transfers it to the image memory 2 .

[0126] In this way, filtering processing is performed on the decoded image data transferred to the image memory 2 .

[0127] When performing the filtering process, the image data of 3 lines×176 pixels is divided accordi...

Embodiment approach 2

[0245] The image processing device according to Embodiment 2 of the present invention is provided with a filter processing circuit 4 described below instead of figure 1 The filter processing circuit 3. Other configurations of the image processing device of Embodiment 2 and figure 1 The image processing device is the same.

[0246] Figure 8(a) ~ Figure 8(c) is a diagram showing a processing flow when filtering processing is performed. Fig. 8 (a) is a diagram showing the processing flow when performing the first filtering process, Fig. 8 (b) is a diagram showing the processing flow when performing the second filtering process, and Fig. 8 (c) is a diagram showing the processing flow when performing the third filtering process. A diagram of the processing flow at the time of the secondary filtering processing. Again, in Figure 8, for the figure 1 The same parts are attached with the same reference numerals.

[0247] Figure 9 is a block diagram of the filter processing ...

Embodiment approach 3

[0334] The image processing apparatus according to Embodiment 3 of the present invention is provided with a filter processing circuit 5 described below instead of figure 1 The filter processing circuit 3. Other configurations of the image processing device of Embodiment 3 and figure 1 The image processing device is the same.

[0335] Figure 15 It is a block diagram of the filter processing circuit 5 according to the third embodiment. Such as Figure 15 As shown, the filter processing circuit 5 except Figure 9 In addition to the structure of the filter processing circuit 4, a pixel holding buffer 50, selectors 52, 53, and a selector controller 51 are provided.

[0336] The filtering processing will be briefly described below.

[0337] FIG. 16 is a conceptual diagram of filtering processing performed by the image processing device according to Embodiment 3. FIG. Again, the notation in Figure 16 is the same as figure 2 The notation in is the same.

[0338] As shown ...

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Abstract

Image data is separated from three lines of image data in accordance with a storage capacity of a source memory. The separated image data is transferred to the source memory, Several pieces of image data are read out in sequence from the transferred image data and forwarded to a filtering process. These operations are then repeated to provide a line of filtered image data.

Description

technical field [0001] The present invention relates to an image processing method and an image processing device that perform filtering processing for effectively removing noise generated during encoding. Background technique [0002] Conventionally, in video telephony, video conferencing, etc., images are encoded and decoded in order to reduce the information amount of images and transmit them efficiently. [0003] Most recent image coding methods and decoding methods use discrete cosine transform. [0004] Discrete cosine transform can greatly reduce the amount of image information. However, its disadvantage is that, due to discrete cosine transform, unique Gaussian noise called mosquito noise appears in the decoded image, and there is a problem of loss of subjective image quality. [0005] Gaussian noise represented by such mosquito noise can be removed by using a spatial filter that removes high-frequency components. [0006] Hereinafter, the filtering process will b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/20G06T5/20H04N1/40H04N1/409H04N1/41H04N5/21H04N7/12H04N7/24H04N19/00H04N19/426H04N19/625H04N19/80H04N19/86
CPCH04N7/26377H04N19/00515H04N7/2675H04N19/0089H04N19/80H04N19/433
Inventor 大桥政宏
Owner PANASONIC CORP
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