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Method and arrangement for generating a color video signal

A color video, color technology, applied in the field of color video signals, can solve problems such as poor results, loss of Bayer pattern uniformity, etc.

Inactive Publication Date: 2009-04-15
NXP BV
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Problems solved by technology

[0004] However, a problem with all known interpolation algorithms is that they work in a satisfactory manner only when the Bayer pattern is uniform, that is, when the pixel-phase is constant
However, the disadvantage of pixel binning is that the uniformity of the Bayer pattern is lost, so that the general demosaic algorithm can only give poor results

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  • Method and arrangement for generating a color video signal
  • Method and arrangement for generating a color video signal
  • Method and arrangement for generating a color video signal

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Embodiment Construction

[0018] figure 1 Schematic representation of (a part of) the Bayer pattern of a color filter array (CFA) that typically precedes a CCD or CMOS image sensor to filter out the red, green and blue components. The pattern consists of quadruples, each quadruple contains one red (R), one blue (B) and two green pixels (Gr, Gb). The two types of green pixels Gr and Gb are arranged in a row (column) with red or blue pixels, respectively. certainly, figure 1 The Bayer pattern also represents the colored pixels produced by an image sensor when light falls on the image sensor through a color filter.

[0019] The columns of the Bayer pattern are identified with lowercase reference characters a...p and the rows of the Bayer pattern are identified with reference numbers 1...16. These reference characters and numbers make it possible to use the upper left and lower right pixels of the pixel block to represent the pixel block, for example, it can be represented by [a1, p16] figure 1 The en...

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Abstract

Method and apparatus for demosaicing a mosaic pattern of a color picture. To improve the picture quality, especially in case of a non-uniform mosaic pattern, a kernel of the mosaic pattern is selected, and the pixel values of the kernel are multiplied by coefficients that comply with a non-linear bi-dimensional interpolation algorithm. Additionally the pixels of the selected kernel may be multiplied by sharpening coefficients that comply with a derivative of the non- linear bi-dimensional interpolation algorithm.

Description

technical field [0001] The present invention relates to a method and device for generating a color video signal through a photosensitive image sensor having a mosaic color filter array, comprising: multiplying the color pixel values ​​of color pixels of a specific color in a rectangular kernel by the same set of coefficients, and applying In a manner of obtaining a new pixel by summing the product results, a new pixel value of the specific color is obtained by interpolation according to the color pixel value. Background technique [0002] In a common image sensor used in a video camera or video camera, pixels of red, green and blue colors exist in a "mosaic" pattern (aka Bayer pattern). The GRGB pattern of the most common pattern, which consists of a quadruplet consisting of one red pixel, one blue pixel, and two green pixels. Therefore, only a quarter of the pixels provide red information, a quarter provide blue information, and the remaining half of the pixels provide gre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N9/04
Inventor 克里斯托夫·克费德
Owner NXP BV
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