It represents the pixel value at the source image, which is known as bilinear interpolation. When using the bilinear interpolation algorithm to calculate the pixel value of the image, the usual method is to use the weighted sum method to calculate the pixel value of the unknown pixel points from the four adjacent points on the 2 * 2 area near the pixel grid of the interpolated image. Therefore, the pixel value obtained by image interpolation can be well fused with the pixel value near the image. The information of the image obtained by bilinear interpolation will be lost to some extent, so there will be spikes on the edge of the interpolated image and at the same time the key information will be blurred to some extent[<br>
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