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Method of color interpolation in digital camera

An interpolation method and technology of digital cameras, applied in the field of color reconstruction of color filter arrays, can solve the problems of blurred edges of peripheral pixels and large gradient of primary color value, etc., and achieve the effects of clear edges, fast processing speed, and noise elimination.

Inactive Publication Date: 2005-01-26
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

Its shortcomings are: the gradient of the base color value at the edge of the image is very large, and the interpolation using the mean and median values ​​​​of surrounding pixels blurs the edge, and also causes light and dark aliasing at the edge of the image

Method used

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Embodiment Construction

[0022] In the charge-coupled device (CCD) color filter array, the distribution of the red, green and blue color filters has a fixed law, in which the red filter and the blue filter only account for all four. 1 / 1, while the green filter accounts for 1 / 2 of the total, and its distribution is shown in Figure 1. The original digital image obtained by using CCD is shown in Figure 2.

[0023] Implementing the difference method involved in the present invention for the entire original image obtained by the CCD is realized by a cyclic structure, with six rows of pixels as the processing object of a cycle, from the zero row to the fifth row, for the middle 2 and 3 rows Pixel difference, complete a cycle, move down two rows, and carry out the next cycle, as shown in Figure 3, the processing steps of the present invention are as follows:

[0024] (1) Use the edge judgment method to insert the default G primary color value for the B pixels in the 1st and 3rd rows, and initially estimate ...

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Abstract

The invention relates to a color interpolation method used in digital camera and belongs to digital imaging technology field. The invention is based on YCbCr chromaticity space and aims to the rough image captured from CCD. It makes the full advantage of low frequency characteristic of image CbCr signal. And according to original information of every pixel base color value, the G base color value would be interpolated from R pixel and B pixel at first. Then, according to the transformation formulae between YcbCr chromaticity space and RGB three base color space or using interpolation calculation method, the CbCr value of every pixel would be gained. Finally, according to the transformation formulae between YCbCr chromaticity space and RGB three base color space, the default base color value of every pixel would be anti-developed. By using the method, the boundary of the image would be in focus, and the noise would be banished. Moreover, it can also ensure quick processing speed.

Description

technical field [0001] The invention relates to a color interpolation method in a digital camera, in particular to a color reconstruction method for a color filter array in a digital camera. Used in the field of digital imaging technology. Background technique [0002] The imaging devices of common digital cameras and digital video cameras are charge-coupled devices (CCDs), which use charge packets as image signal carriers, and use photons to excite electrons in single crystal silicon—the photosensitivity effect of hole pairs realizes photoelectricity. convert. A charge-coupled device (CCD) is dotted with tiny photoelectric conversion units, which correspond to each pixel of a digital image. The digital camera activates the CCD through the shutter to convert the light signal into an electrical signal, and each photoelectric conversion unit converts the light intensity it receives into a voltage signal, and then converts the electrical signal into a digital signal, and stor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/225H04N9/64
Inventor 喻再光赵群飞贺继林
Owner SHANGHAI JIAO TONG UNIV
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