A low-aliasing high-stability color filter array and its conversion matrix

Abstract

The invention discloses a low-aliasing high-stability color filter array and its conversion matrix, which consists of at least one 4*4 array. Or tiled in sequence in the vertical direction; each 4*4 array is the smallest periodic unit, which is composed of 4*4 pixels, and each smallest periodic unit is composed of red unit bases, green unit bases and blue unit bases mixed Composition, the sum of the parameters of red unit base, green unit base and blue unit base in each minimum periodic unit is 1, retains to 3 decimal places; The present invention introduces chromaticity copy in the frequency spectrum of color filter array, improves The accuracy of filtering in the subsequent demosaicing process reduces errors, and in the frequency domain, the distance between chrominance and brightness, and chrominance and chrominance is small, which effectively reduces aliasing. Moreover, the norm of the demosaicing matrix of the present invention is small, so that errors generated in the process of estimating non-zero aliasing components have little influence on the subsequent demosaicing process, and the stability is good.

Description

【Technical field】 [0001] The invention belongs to the technical field of color imaging, and in particular relates to a low-aliasing high-stability color filter array and a conversion matrix thereof. 【Background technique】 [0002] Due to the wide application of digital color imaging equipment, more and more researchers pay more and more attention to the image acquisition process. However, in order to obtain the color value of each pixel, a digital color imaging device needs to use at least three sensors in order to perceive at least three color components at the same time, which makes the process of restoring the image after obtaining the color value of the image extremely complicated. In order to reduce size, complexity and cost, most digital cameras use a sensor covered with a color filter array to filter out other colors of each pixel through the color filter array to obtain the specific color of each pixel. The tint value of the color. The image is then restored using ...

AI Technical Summary

Problems solved by technology

[0005] However, the existing color filter arrays have certain defects. For example, in the frequency domain, the chroma component is located on the horizontal axis and the vertical axis where the luminance component is located, or between the chroma component and the luminance component, or between the chroma component and the chroma component. The distance between the high-degree components is small, which leads to errors when collecting these components in the subsequent demosaicing process. The norm of the demosaicing matrix does not reach a small value, and the stability is not good. Therefore, low aliasing and high stability are important for color filters. design matters

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