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 | 1 | initial version |
yes, it's essential. please read the paper: http://research.microsoft.com/~viola/Pubs/Detect/violaJones_IJCV.pdf
the viola-jones method is all about [comparing rectangles] (http://en.wikipedia.org/wiki/File:Prm_VJ_fig1_featureTypesWithAlpha.png)
with those integral images, the check is just a handful of array lookups and adds, without, you'd have to loop through the image region every time, to get it's intensity
| | 2 | No.2 Revision |
yes, it's essential. please read the paper: http://research.microsoft.com/~viola/Pubs/Detect/violaJones_IJCV.pdf
the viola-jones method is all about [comparing rectangles]
(http://en.wikipedia.org/wiki/File:Prm_VJ_fig1_featureTypesWithAlpha.png)comparing rectangles, is the left one brighter than the right ?
with those integral images, the check is just a handful of array lookups and adds, without, you'd have to loop through the image region every time, to get it's intensity
