Various channel types Integral channel feature

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nonlinear channels: there many non-linear channels. popular ones canny edge detector , gradient magnitude. canny gives edge information whereas gradient magnitude gives edge strength.
pointwise transformations: name suggests, pointwise transformations operate on individual pixels. examples include logarithmic operator , exponential operator. logarithmic operator enhances low intensity pixels whereas exponential complete opposite.
gradient histogram: histogram of image bins determined gradient angle. each pixel votes , weight determined gradient magnitude. histogram of oriented gradients (hog) descriptor popular descriptor developed dalal , triggs.

note these channels can used alone or in combination each other.







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