Bayer Pattern
Bayer Pattern, sometimes referred to as demosaicing, replaces colors in Bayer images. A decoding algorithm determines a value for the RGB components for each pixel in the array by averaging the color values of selected neighboring pixels and producing an estimate of color and intensity. After the interpolation process is complete, the white balancing process further enhances the image by adjusting the red and blue signals to match the green signal in white areas of the image.
Example
Several decoding algorithms perform color decoding, including nearest neighbor, linear, cubic, and cubic spline interpolations. The following example provides a simple explanation of the interpolation process.
To determine the value of the pixel in the center of the following group:
RGR
GBG
RGR
When the pixels have the following values:
| 200 | 50 | 220 |
| 60 | 100 | 62 |
| 196 | 58 | 198 |
Neighboring pixels will be used to determine the RGB values for the center pixel. The blue component will be taken directly from the pixel value, and the green and red components are the average of the surrounding green and red pixels, respectively.
R = (200 + 220 + 196 + 198)/4 = 203.5 ~ 204
G = (50 + 60 + 62 + 58)/4 = 57.5 ~ 58
B = 100
The final RGB value for the pixel is (204,58,100). This process will be repeated for each pixel in the image.