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Chapter five core components advanced
5.1
1. 
2. color space reduction
3. The timing function
4. The three ways to access pixels in an image
5.2 ROI mixing region image and overlay
1. Linear superposition: primarily using superposition Mat :: copyTo
2. Linear Mixed: addWeighted () function
3. The channel separation function SPIT ()
4. The combined passage Merge ()
5.4 Contrast, brightness adjustment value
1.saturate_cast used to prevent overflow, e.g. saturate_cast
5.5 discrete Fourier change
1.dft () function
2.
3. Expansion image boundary
4. the two-dimensional vector magnitude calculation
5. the natural logarithm
6. matrix normalization: the normalize ()
5.6 YAML input and output XML document
1.
to sum up
