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A demosaic method and device

A demosaicing, eight-direction technology, applied in the field of image processing, can solve problems such as increasing hardware resource consumption, reduce hardware costs, and solve the effect of zipper effect

Active Publication Date: 2021-10-08
ALLWINNER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In addition, the general method of suppressing image false color is usually to convert the image from RGB color space to YUV / YCbCr color space, separate the luminance and chrominance signals, remove the false color of the chrominance signal, and then convert back to RGB Color space for other ISP process processing, such conversion greatly increases the consumption of hardware resources

Method used

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  • A demosaic method and device

Examples

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Embodiment 1

[0054] Example 1, such as figure 1 As shown, a demosaic method described in the embodiment of the present invention, wherein the template window of 9*9 pixels is uniformly used for interpolation, and the specific implementation steps of the method are:

[0055] Step 101: Calculate the color difference gradient of the current pixel in eight directions, the eight directions include: North N, South S, West W, East E, Northwest NW, Southeast SE, Northeast NE and Southwest SW;

[0056] Step 102: judging the interpolation direction of the current pixel and calculating the weight of the corresponding interpolation direction;

[0057] Step 103: Calculate the missing G pixel value at the current R pixel and B pixel through the interpolation direction determined in step 102 and the corresponding weight;

[0058] Step 104: Using the interpolation direction determined in step 102 and the corresponding weights to interpolate the missing B pixel at the R pixel and the missing R pixel value...

Embodiment 2

[0141] Example 2, such as figure 2 As shown, the present invention also provides a demosaic device, the device comprising:

[0142] The color difference gradient acquisition module is used to calculate the color difference gradient of the current pixel in eight directions, the eight directions include: North N, South S, West W, East E, Northwest NW, Southeast SE, Northeast NE and Southwest SW, for judging the direction of interpolation;

[0143] A weight calculation module, which is used to judge the interpolation direction of the current pixel and calculate the weight of the corresponding interpolation direction;

[0144] A multi-channel parallel interpolation module, which is used to calculate the missing G pixel value at the current R pixel and B pixel through the interpolation direction and corresponding weight determined by the weight calculation module, and interpolate the missing B pixel and B pixel at the R pixel. The missing R pixel value at the pixel, and the miss...

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Abstract

The invention discloses a demosaicing method, which comprises calculating the color difference gradient in eight directions of the current pixel; judging the interpolation direction of the current pixel and calculating the weight of the corresponding interpolation direction; and calculating through the determined interpolation direction and the corresponding weight The G pixel value missing at the current R pixel and B pixel; then interpolate the missing B pixel and R pixel value at the R pixel and B pixel, and the missing R pixel and B pixel value at the G pixel; finally, the interpolated RGB The resolution of the image is adjusted after false color elimination. The invention also provides a demosaic device. The beneficial effects of the present invention are: the method can recover the missing color components on the CFA more accurately, and solve the problems of zipper effect, false color, moiré, maze effect, edge blur, etc.; and the processing flow is parallel processing , while interpolating multi-channels such as R, G, and B, which greatly reduces the hardware cost of the device.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to a demosaicing method and device. Background technique [0002] In order to reduce cost, reduce volume and facilitate hardware processing, the original (Raw) image collected by a single image sensor (Sensor) is called a color filter array (Color Filter Array, CFA) image, which is a mosaic image , the filter array covered in front of the sensor filters the captured light according to the wavelength. In this way, each pixel in the image regularly only collects one of the multiple color components. A specific CFA type will have Its own corresponding arrangement. The image signal processor (ISP) then processes the CFA data captured by the sensor, and undergoes a demosaic operation to obtain a complete full-color image. The process of reconstructing the missing color components on each pixel in CFA so that its value can be associated with each pixel is called demosai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N9/04
CPCH04N23/843H04N25/13
Inventor 李智钟午杨帆彭刚
Owner ALLWINNER TECH CO LTD
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