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Demosaicing method for CFA (color filter array) images based on edge-direction interpolation

A technology of demosaicing and edge direction, applied in image data processing, graphic image conversion, instruments, etc., can solve the problem of poor high-frequency part interpolation effect, achieve suppression of false color effects, improved interpolation effect, and small amount of calculation Effect

Inactive Publication Date: 2011-11-23
XIDIAN UNIV
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Problems solved by technology

[0006] Aiming at the defect that the existing demosaicing algorithm has poor interpolation effect on the high-frequency part of the image, a CFA image demosaicing method based on edge direction interpolation is proposed. Guided by the accurately estimated brightness, the green channel along the edge direction Interpolation and post-interpolation correction make the interpolation result of the high-frequency part of the image significantly improved, effectively suppressing the false color effect

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Embodiment Construction

[0025] Attached below figure 1 , the step that the present invention realizes is described in further detail:

[0026] Step 1, input a CFA image I to be demosaiced s

[0027] The CFA image to be demosaiced is a CFA image in Bayer mode. In this image, only one color value of the three primary colors is known for each pixel, and the remaining two color values ​​are unknown; each adjacent CFA image is 2×2 Among the four pixels of the image block, two pixels have known green values, and the other two pixels have known red values ​​and blue values ​​respectively.

[0028] Step 2, Estimate Brightness

[0029] 2a) Design a 9×9 filter Γ according to the following formula 1 and a 5×5 filter Γ 2

[0030] Γ = A ( H T σ - 1 H + λ ...

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Abstract

The invention discloses a demosaicing method for CFA (color filter array) images based on edge-direction interpolation. The demosaicing method for CFA images mainly solves the problems that the interpolation effect of the high-frequency part of an image is not good, and the false color effect is serious in the traditional demosaicing method. The demosaicing method for CFA images comprises the steps of: (1) inputting a CFA image to be demosaiced; (2) estimating the brightness; (3) interpolating a green channel; (4) respectively carrying out dual linear interpolation on a red channel and a bluechannel; (5) respectively correcting the red channel, a green channel and the blue channel; and (6) outputting a colorful image. The demosaicing method for CFA images has the advantages of capabilityof better maintaining high-frequency information of the image, inhibiting the false color effect effectively and improving the visual effect of the demosaiced CFA image has short running time.

Description

technical field [0001] The invention belongs to the technical field of image processing, and further relates to a CFA image demosaic method based on edge direction interpolation in the technical field of image restoration. The invention interpolates the CFA image with mosaic effect to obtain the color image with all the information of the three channels of red, green and blue. The invention can be used in a single-sensing camera, as a post-processing algorithm to process the CFA image captured by the CCD or CMOS sensor, and restore a complete digital color image, thereby making up for the loss of image color information caused by reducing the cost of camera hardware . Background technique [0002] Digital color images usually use red, green, and blue primary colors to represent color values. For cost considerations, most cameras currently use a single CCD or CMOS sensor. By adding a color filter array (color filter array, CFA) in front of the sensor, only one matrix is ​​u...

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Application Information

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IPC IPC(8): G06T3/40
Inventor 王桂婷焦李成朱同华钟桦张小华田小林公茂果侯彪王爽
Owner XIDIAN UNIV
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