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bilinear interpolation

It is often necessary to estimate the value of what a pixel would be between neighboring pixels. This is accomplished by interpolating (or inserting) the value of a pixel between neighboring pixels. Several interpolation methods exist to perform this task including linear, cubic, bilinear and bicubic interpolation. In bilinear interpolation, a linear interpolation is first performed between pixels in the horizontal (X) direction of the image and then in the Y direction (or vice-versa) to obtain the bilinearly interpolated pixel.
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