Abstract
A pixel (aka picture element) is an element at position (r, c) (row, column) in a digital image I . A pixel represents the smallest constituent element in a digital image. Typically, each pixel in a raster image is represented by a tiny square called a raster image tile. Raster image technology has its origins in the raster scan of cathode ray tube (CRT) displays in which images are rendered line-by-line by magnetically steering a focused electron beam. Usually, computer monitors have bitmapped displays in which each screen pixel corresponds to its bit depth, i.e., number of pixels used to render pixel colour channels.
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Notes
- 1.
Many other ways to compute the probability of a pixel intensity img(x, y) are possible. There is a restriction:
$$ \mathop {\sum }\limits _{i=1}^{n*m}p_i(img(r, c)) = 1, 1\le r\le m, 1\le c\le n. $$ - 2.
Many thanks to Patrik Dahlström for pointing out the corrections in eg_log1.m.
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Peters, J.F. (2017). Working with Pixels. In: Foundations of Computer Vision. Intelligent Systems Reference Library, vol 124. Springer, Cham. https://doi.org/10.1007/978-3-319-52483-2_2
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DOI: https://doi.org/10.1007/978-3-319-52483-2_2
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