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Image processing apparatus and method thereof

An image processing equipment, image technology, applied in the direction of image data processing, image enhancement, image communication, etc.

Inactive Publication Date: 2008-07-30
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, these problems can also be caused by performing noise removal processing when a textured area including a fine edge of an image signal is regarded as a noise part

Method used

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  • Image processing apparatus and method thereof
  • Image processing apparatus and method thereof

Examples

Experimental program
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no. 1 example

[0044] FIG. 1 is a block diagram showing the structure of a main part of an image processing apparatus according to a first exemplary embodiment of the present invention. This embodiment defines a processing unit of image data as a block of 4×4 pixels called an object block.

[0045] Referring to FIG. 1, a horizontal edge strength measuring instrument 100 receives a block of a luminance signal of an image, and measures a horizontal edge strength of the block. The vertical edge strength measuring instrument 101 receives a block of the luminance signal of the image, and measures the vertical edge strength of the block. This exemplary embodiment expresses the edge strength of the pixels of the target block as a processing unit by the cumulative value of the Sobel filter.

[0046] 8A and 8B are diagrams showing examples of operators of the Sobel filter used in this embodiment. FIG. 8A shows a 3×3 horizontal Sobel filter used in the horizontal edge strength measuring instrument 1...

no. 2 example

[0087] Fig. 11 is a block diagram showing the structure of a main part of an image processing apparatus according to a second embodiment of the present invention. The second embodiment defines a control unit of image data as a block of 4×4 pixels called an object block. Note that the same reference numerals in FIG. 11 denote the same components as those in FIG. 1 according to the first embodiment described above, and description thereof will not be repeated.

[0088] The ε filter 200 performs ε filtering processing in response to a control signal 210 from the filter controller 105 .

[0089] FIG. 13 shows a diagram explaining this ε filtering process.

[0090] This filtering process calculates the pixel value f(x, y) of the center pixel and the pixel value f(x+i, y+j) (i, j=-M, . . . 0, 1, ...M) the difference between. If the absolute value of the difference is greater than ε, the pixel value of the central pixel is used to replace the pixel value of the adjacent pixel to a...

no. 3 example

[0106] Fig. 14 is a block diagram showing the structure of a main part of an image processing apparatus according to a third exemplary embodiment of the present invention. Note that the third embodiment defines the 8×8 pixel size of the luminance signal of an image and the 4×4 pixel size of its color difference signal as a processing unit of image data, and this unit is called a target block.

[0107] Referring to FIG. 14, a horizontal edge strength measuring instrument 100 receives a block of a luminance signal of an image, and measures the horizontal edge strength of the block. The vertical edge strength measuring instrument 101 receives a block of the luminance signal of the image, and measures the vertical edge strength of the block. This embodiment expresses the edge strength of each pixel of a block as a processing unit by the cumulative value of the Sobel filter. The operator of the Sobel filter used in the third embodiment is the same as that in FIGS. 8A and 8B.

[0...

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Abstract

The present invention provides an image processing apparatus and method. The intensities of horizontal and vertical edges of each block of luminance signals of an image are measured, and horizontal and vertical edge intensity data of respective blocks are stored for one frame in an edge intensity mapping memory. A noise removal flag used to specify a filtering block is calculated based on the edge intensity data, and is stored in a noise removal flag mapping memory. A filter controller controls whether or not to apply filtering processing to each block, specified by this noise removal flag, of the current frame of the image based on the horizontal and vertical edge intensity data of that block of the current frame and those of the corresponding block of the immediately preceding frame.

Description

technical field [0001] The present invention relates to an image processing device and method for detecting a noise-containing part of an image and removing the noise part, wherein the image is processed by, for example, MPEG (Moving Picture Experts Group, Moving Picture Experts Group) method, etc. The image obtained by decoding the image data encoded by the frequency transformation and lossy compression. Background technique [0002] Conventionally, as an image coding method, motion JPEG and digital video, which are intraframe coding methods, and H.261, H.263, MPEG-1 and MPEG-2. In recent years, coding schemes such as H.264 have been known. These encoding methods are internationally standardized by ISO) (International Organization for Standardization, International Organization for Standardization) and ITU (International Telecommunication Union, International Telecommunication Union). [0003] MPEG-2, which is a representative encoding method, is called lossy encoding, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/21H04N7/64G06T5/20H04N1/409H04N9/64H04N11/04H04N19/00H04N19/117H04N19/134H04N19/136H04N19/14H04N19/196H04N19/423H04N19/80H04N19/85H04N19/86H04N19/89
Inventor 大平正
Owner CANON KK