7 Digital images: representation and pixel-level processing
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This chapter currently contains the approved heading structure but no reviewed technical content.
7.1 The digital image as a signal
7.1.1 Sampling, quantisation and the resulting data model
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7.1.2 Coordinate systems, indexing and boundary conventions
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7.1.3 Colour, greyscale and multi-channel representations
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7.1.4 File formats and lossless vs lossy compression
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7.2 Point operations
7.2.1 Brightness, contrast and gain
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7.2.2 Look-up tables, gamma and tone curves
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7.2.3 Histogram equalisation and adaptive stretching
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7.2.4 Thresholding as a point operation
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7.3 Arithmetic and logical operations
7.3.1 Pixel-wise arithmetic and blending
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7.3.2 Absolute and signed differences
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7.3.3 Masking and region-of-interest operations
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7.3.4 Bitwise operations on binary images
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7.4 Noise models and denoising choices
7.4.1 Gaussian, Poisson and impulse noise models
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7.4.2 Estimating noise from image statistics
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7.4.3 Choosing a denoiser: signal preservation vs artefact suppression
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