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Hands-On Image Processing and Computer Vision with Python - Second Edition
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Image formation fundamentally involves sampling and quantization. Sampling is a spatial operation that selects image pixels to change image resolution, while quantization reduces the number of intensity or color levels used to represent an image. These operations form the basis of image resizing, compression, and digital image representation. Sampling can be used to increase or reduce the size of an image, with upsampling and downsampling, respectively.
An image may be viewed as a discrete sampling of a continuous 2D intensity function
. Upsampling increases image resolution (size) by generating additional pixels at locations where intensity values are unknown. Since these values are unavailable in the original image, they must be estimated using aggregate statistics such as the mean, or interpolation techniques based on neighboring pixels. Interpolation attempts to reconstruct a continuous approximation of the...
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