Indicates the pixel value of the source image, which indicates that it is a double line interpolation method. When using the bilinear interpolation algorithm to get the pixel values of an image, the common way is to use the weighted sum method to get the calculation at 4 adjacent points in the 2 * 2 area near the image's pixel grid after interpolation. Pixel value of unknown pixel. Therefore, pixel values obtained by image interpolation can be well fused with pixel values near the image. The information in the image obtained by the bilinear interpolation method is lost to some extent, so after the interpolation, spikes are generated at the edges of the image and the main information is somewhat blurred.
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