Description: A grayscale original image of 512 × 512, using a 3 × 3 window average (gradation values of pixels of the original image 128 is assumed as a peripheral) as its filter operation interlaced image after filtering, every row of pixels to discard half 256 × 256 forming a small image this small image within the respectively adjacent interpolation, bilinear interpolation method to enlarge it to a large image of 512 × 512. Comparison of the original image, calculating two kinds of enlarged image of each PSNR.
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