Hello all! I have some questions about function cvIntegral().
1. Why resulting integral image have size (source_width+1) x (source_height+1), but not source_width x source_height?
2. How integral image of colored image (3-channel) is calculating?
Because for row with 5 elements you may need 6 sums: with 0, 1, 2, 3, 4 or 5 elements.
It is supposed to be single channel image. See documentation of this function.
You missed the row and column of zeros. It will be {{0 0 0 0} {0 1 3 6} {0 4 8 12} {0 6 13 18}}. Please see how sum(X,Y) is calculated in the documentation.
This column and row of zeros are needed for convenience. Without them you will need to check boundary conditions in computations that use integral image.
Asked: 2013-02-04 00:54:06 -0600
Seen: 1,715 times
Last updated: Feb 04 '13
