Color filter lens array interpolation method

An interpolation method and interpolation technology, applied in color TV, picture signal generators, instruments, etc., can solve problems such as sawtooth errors, achieve clear edges, simple and practical interpolation methods, and accurate and unbiased colors

Active Publication Date: 2007-02-14
SPREADTRUM COMM (SHANGHAI) CO LTD
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Problems solved by technology

However, this method often produces obvious aliasing errors at the edges

Method used

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  • Color filter lens array interpolation method
  • Color filter lens array interpolation method
  • Color filter lens array interpolation method

Examples

Experimental program
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Embodiment Construction

[0026] 1. Interpolate red pixels (for example: figure 1 The green and blue values ​​of the center point 13) are shown:

[0027] 1) In the first step, the green value of the central pixel point 13 is interpolated.

[0028] First determine the direction of interpolation of the green value of the center pixel 13 (horizontal, vertical, or cross direction):

[0029] Δ h =|2×I 13 -I 11 -I 15 |+|I 12 -I 14 | [1]

[0030] Δ v =|2×I 13 -I 3 -I 23 |+|I 8 -I 18 | [2]

[0031] where I i for figure 1 The pixel value of each corresponding pixel in the pixel, Δ h is the second-order gradient value in the horizontal direction, Δ v is the second-order gradient value in the vertical direction.

[0032] If Δ h -Δ v If it is greater than the positive threshold T, interpolation is performed in the vertical direction

[0033] If Δ h -Δ v If it is less than the negative threshold -T, interpolate in the horizontal direction

[0034] Otherwise, interpolate in the vertical and ...

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Abstract

This invention provides an array interpolating method for a color filter lens, which combines the advantages of traditional interpolating method based on an edge test and a method based on CFA standard color primary standard and the interpolating color value of the central point is obtained by those of the surrounding points in a certain factor so as to secure clear edge of output images and accurate output color.

Description

technical field [0001] The invention relates to an image generation method of a digital camera, in particular to an interpolation method. Background technique [0002] Most digital cameras use a single-sensor structure, and there is only one color value (red, green, or blue) at each pixel position of the original image collected by the sensor, and a full-color image needs to be obtained through interpolation. The quality of the interpolation algorithm determines the quality of the output image. [0003] The main idea of ​​the interpolation method based on edge detection is that at the edge of the image feature, the interpolation should be carried out along the direction of the edge, rather than the direction of the vertical edge, so as to ensure that the edge of the interpolation result is clear. However, the interpolation method based on edge detection will produce obvious color deviation in the high-frequency details of the image. [0004] The main idea of ​​the interpol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/58
CPCG06T3/4015H04N9/045H04N2209/046
Inventor 冯晓光张本好胡静林福辉
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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