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Color image sensor and method for acquiring color digital image
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An image sensor and color image technology, applied in image data processing, color TV components, color TV, etc., can solve problems such as waste, low utilization of sensor elements, and inability to correctly reflect natural colors
Inactive Publication Date: 2016-04-20
陶霖密
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[0017] To sum up, the existing color image sensors mainly have the following problems: first, four sensing elements output one pixel, the utilization rate of the sensing elements is low, and there is a serious waste phenomenon; second, the four sensing elements are in different positions. The position, that is, the RGB three-color value in the same pixel does not come from the same position, and there are slight differences, so it cannot correctly reflect the real color in nature
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Embodiment 1
[0073] Such as figure 2 As shown, a color image sensor includes an image sensor and a color filter, and the color filter is covered on the surface of the image sensor, and the image sensor is arranged as a sensor array by a plurality of sensor elements The color filter is formed by arranging a plurality of color filter elements into a color filter element array; the color filter element array includes at least three colors of color filter elements; one color filter element corresponds to A sensor element that outputs a pixel in a color image. Preferably, the color filter element array includes a red filter element, a green filter element and a blue filter element, such as figure 2 , image 3 , Figure 4 and Figure 5 shown. The color filter elements in the color filter element array are randomly arranged, such as figure 2 shown. The color filter elements of one color in the color filter element array are arranged according to rules, and the color filter elements of o...
Embodiment 2
[0075] A method for obtaining a color digital image by using the above-mentioned color image sensor, by calculating and obtaining the pixel value of any color filter element in the following manner
[0076] Color vision studies have shown that the combination of multiple color photosensitive units can produce red, green and blue three-color images. The present invention proposes a calculation method for the color filter element array:
[0077] (1) There are n (n>=3) color filter elements of different colors in the color filter element, which are respectively C 1 , C 2 ,...,C n ;
[0078] (2) Color coefficient Λ Ri , Λ Gi , Λ Bi (01 , C 2 ,...,C n Contains red, green and blue three-color components, namely:
[0079] Λ Ri C i =R
[0080] Λ Gi C i =G
[0081] Λ Bi C i =B
[0082] Wherein, i represents the type of color filter element in the color filter element array, that is, i=1, 2, 3, . . . , n. If n=3, there are:
[0083] Λ = ...
example 1
[0116] Algorithm example 1: The following takes the color filter element array model 4 as an example to illustrate the above calculation method:
[0117] by Figure 4 The filter element referred to by 401 is Take its neighborhood filter element set Such as Figure 7 shown, and take:
[0118]
[0119] Λ=1;
[0120] Then it can be calculated that the pixels in the color image correspond to of pixels the color value of for:
[0121] R X = 1 4 Σ R y G X = 1 4 Σ G y ...
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Abstract
The present invention relates to a color image sensor and a method for acquiring a color digital image, in particular to a color filter element array; the color image sensor includes an image sensor and a color filter, and the color filter covers the image On the surface of the sensor, the image sensor is composed of a plurality of sensor elements arranged as a sensor element array; the color filter is composed of a plurality of color filter elements arranged as a color filter element array; a color filter The element corresponds to a sensing element, which outputs a pixel in a color image. The method of obtaining a color digital image is to calculate and obtain the pixel value of any color filter element through a specific formula. One color filter element in the color filter element array outputs one pixel in the color image. The invention greatly improves the utilization rate of the sensor; can reconstruct RGB three-color values at the same position from multiple color filter elements, and improves the accuracy of color restoration.
Description
technical field [0001] The invention relates to a sensor and a method for acquiring an image, in particular to a color image sensor and a method for acquiring a color digital image, in particular to a color filter element array. The color image sensor based on the color filter element array can be used in digital image and video equipment such as various digital cameras and digital video cameras. Background technique [0002] Digital color image sensors are the most critical components in digital image devices such as digital cameras and video cameras, and are used to convert the optical image focused by the lens into a digital color image. Color digital image devices can be divided into two types according to the number of image sensors inside: (1) Single image sensor color digital image devices, including most digital video cameras and digital cameras, are characterized in that there is only one image sensor in these digital color image devices Image sensor (CCD or CMOS i...
Claims
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