Hi,
With integral image, the task of calculating the area of an upright rectangular region is reduced to four operations. Thus, the computation time is invariant to size of the rectangular. HOWEVER the result of the four operation is the SUM of pixel (of integral image) within the rectangular region. SO HOW is the SUM used for object detection?
My understanding (correct me if i'm wrong)
Let say i have an image with 100*100 pixels. So the resultant integral image will be 100*100 pixels as well. The used of integral image is because its computational time of any rectangle region is almost constant(invariant to size). So let say i have an object of interest in the image, the object is in a 50*50 pixels window. So the calculate of the sum of pixel within the window is constant time even if the window size increase. >>>after this point i'm stuck. How is value of the sum of pixel within a rectangular window useful?
Thanks
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