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G-point filtering method and filtering device in raw image

A technology of G value in images, applied in the field of image processing, can solve problems such as large fluctuations in the mean value, affecting the accuracy of the absolute value of the gradient, and inconsistency in the calculation of the mean value

Active Publication Date: 2016-03-02
深圳秀蛋科技有限公司
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  • Application Information

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Problems solved by technology

In the RAW image, the calculation of the mean value of the pixel in each direction is not consistent, and when the length of the direction is short, the calculated mean value fluctuates greatly, which ultimately affects the accuracy of the absolute value of the gradient relative to the minimum method.

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  • G-point filtering method and filtering device in raw image
  • G-point filtering method and filtering device in raw image

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Embodiment Construction

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0037] figure 1 It is a schematic flow chart of a G-point filtering method in a RAW image according to an embodiment of the present invention, referring to figure 1 , the method includes:

[0038] 100: Create an M×N window with the current G point as the center, and use the G point as the center to calculate the horizontal, vertical, oblique 45°, oblique The absolute value of the gradient in the 135° direction, where the horizontal and vertical directions are the...

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Abstract

The embodiment of the invention discloses a filtering method of G points in RAW images and also discloses a filtering device of the G points in the RAW images, wherein the method comprises the following steps of establishing an M*N window by using the current G point as a center, and calculating the absolute gradient values of horizontal, vertical, inclined 45-degree and inclined 135-degree directions according to the distributing situation of R (Red), G (Green) and B (Blue) color channels in the M*N window, wherein the horizontal and vertical directions are used as a first direction group, the inclined 45-degree and inclined 135-degree directions are used as a second direction group, and both the M and the N are positive integers; and determining which direction group is selected by adopting a hard-decision method according to the absolute gradient values of the four directions. By adopting the invention, the proper direction group can be selected by accurately identifying which group's detail is in the ascendance through hard decision; and in addition, the weighted mean value of the G channel is calculated through soft decision by adopting a smaller-granularity absolute-gradient-value calculating method and a G-channel mean-value calculating method, and the high-frequency detail is better reserved after filtering.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a G-point filtering method and filtering device in a RAW image. Background technique [0002] During the processing of RAW (RAW is the name of an image file format, the data of the image has not been processed), the selection of the direction is involved. [0003] In prior art 1, when selecting between different directions, a direction is selected according to the minimum absolute value of the direction gradient, and then the pixel (pixel) value in this direction is calculated. When the pixel sample value in the selected direction is small, the absolute value of the gradient will be small, which cannot be identified in the prior art. [0004] In the second prior art, when selecting between different directions, the selection is made according to the smallest absolute value of the gradient of the direction / average pixel value of the direction, and then the average pixel value in t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00
Inventor 李水平林少伟
Owner 深圳秀蛋科技有限公司
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