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How to use CascadeClassifier with a mask

Hi, i want to speed up my Object-detection. The idea is that the algorithm only search in the region of the mask. Is there a simple solution to realize this? for example the mask look loke this:
Uploaded with ImageShack.us

i can use findContour, but i think thats not effectiv by areas with a wide spread.

greetings

How to use CascadeClassifier with a mask

Hi, i want to speed up my Object-detection. The idea is that the algorithm only search in the region of the mask. Is there a simple solution to realize this? for example the mask look loke this:
Uploaded with ImageShack.us

i can use findContour, but i think thats not effectiv by areas masks with a wide spread.

greetings