Improved bilinear Bayer format color interpolation method

A color interpolation and bilinear technology, applied in the field of digital image processing, can solve the problems of digital camera imaging speed influence, large amount of calculation, high algorithm complexity, etc., and achieve ideal image effect and high peak signal-to-noise ratio

Inactive Publication Date: 2012-09-12
ZHEJIANG UNIV
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Problems solved by technology

The algorithm has high algorithm complexity and high overhead
The median filter has a better effect on the edge performance of the image, with less distortion, and the suppression effect on false color is particularly good, and the color distortion

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  • Improved bilinear Bayer format color interpolation method
  • Improved bilinear Bayer format color interpolation method
  • Improved bilinear Bayer format color interpolation method

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Embodiment Construction

[0053] The present invention will be further described below in conjunction with accompanying drawing.

[0054] Step 1. Reconstruct the full resolution green component G

[0055] In the Bayer format color filter array, the number of sampling points of the green component accounts for half of the total sampling points of the image, which is twice the number of sampling points of the red component or blue component, which contains more image information, and the human eye is more sensitive to green than red and blue Sensitive, more sensitive to brightness than color, and in the color space conversion from RGB to YUV, the green component contributes nearly 60% to the brightness Y, and the brightness Y is calculated as:

[0056] Y = 0.299R + 0.587G + 0.114B. (1)

[0057] Therefore, the reconstruction of the full-resolution green component is the most important in the process of full-color image restoration, and the reconstruction of the component G is calculated using an adaptive...

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Abstract

The invention discloses an improved bilinear Bayer format color interpolation method. The conventional method is large in calculation amount for chromatic aberration, high in complexity and long in delay, and the imaging speed of a digital camera is remarkably influenced. In a full-color image reconstruction process, color recovery is realized in a combination way of stepwise interpolating a green component and red and blue components. The method comprises the following steps of: strictly distinguishing an image edge by utilizing the spatial correlation of an image, and reconstructing the green component under full resolution; and reconstructing the red and blue components under the full resolution by using an improved bilinear interpolation algorithm and the correction and compensation of a recovered green component. Compared with the conventional interpolation algorithm, the method has the advantages that the peak signal to noise ratio of a recovered full-color image color signal is high, and an ideal interpolated image effect can be achieved under the condition of no increase of computational complexity of the algorithm.

Description

technical field [0001] The invention belongs to the technical field of digital image processing, and relates to a Bayer format color interpolation method based on green components and edge detection, in particular to a method for realizing color restoration in a combined manner of step-by-step interpolation of green components and red and blue components. Background technique [0002] As digital cameras, scanners and other computer input devices become more and more popular, CCD and CMOS sensors, as the most important components in image systems, are gradually becoming known to people. In order to get the most detailed description of the original image, three groups of CCD sensors are generally required. However, in order to reduce volume and cost, most digital still cameras (digital cameras, digital video recorders, etc.) only use one set of CCD or CMOS sensors. Generally, the color filter array is covered on the digital camera image sensor, because the Bayer format color ...

Claims

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Application Information

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IPC IPC(8): H04N1/58H04N9/04H04N9/64
Inventor 谢磊陈惠芳任浩
Owner ZHEJIANG UNIV
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