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- /********************************
- Author: Sravanthi Kota Venkata
- ********************************/
- #include "tracking.h"
- /** Compute the sum of pixels over pixel neighborhood.
- Neighborhood = winSize*winSize
- This will be useful when we compute the displacement
- of the neighborhood across frames instead of tracking each pixel.
- Input: src Image
- # rows, cols, size of window
- Output: windowed-sum image, ret.
- Example:
- winSize = 4, cols = 8, rows = 16
- nave_half = 2, nave = 4
- Say, the first row of the image is:
- 3 8 6 2 4 8 9 5
- a1 = 0 0 3 8 6 2 4 8 9 5 0 0 (append nave_half zeros to left and right border)
- asum = (sum the first nave # pixels - 0 0 3 8 ) = 11
- ret(0,0) = 11
- For ret(0,1), we need to move the window to the right by one pixel and subtract
- from a1sum the leftmost pixel. So, we add value 6 and subtract value at a1(0,0), = 0 here.
- ret(0,1) = 17 = a1sum
- For ret(0,2), a1sum - a1(0,1) + a1(2+nave) = 17 - 0 + 2 = 19 = a1sum
- For ret(0,3), a1sum - a1(0,2) + a1(3+nave) = 19 - 3 + 4 = 20 = a1sum
- We proceed this way for all the rows and then perform summantion across all cols.
- **/
- F2D* calcAreaSum(F2D* src, int cols, int rows, int winSize)
- {
- int nave, nave_half, i, j, k;
- F2D *ret, *a1;
- float a1sum;
- nave = winSize;
- nave_half = floor((nave+1)/2);
- ret = fMallocHandle(rows, cols);
- a1 = fSetArray(1, cols+nave,0);
- /*
- for(i=0; i<rows; i++)
- {
- for(j=0; j<cols; j++) {
- asubsref(a1,j+nave_half) = subsref(src,i,j);
- }
- a1sum = 0;
- for(k=0; k<nave; k++) {
- a1sum += asubsref(a1,k);
- }
- for(j=0; j<cols; j++)
- {
- subsref(ret,i,j) = a1sum;
- a1sum += asubsref(a1,j+nave) - asubsref(a1,j);
- }
- }
- */
- int togo, size;
- int size1=rows*cols;
- for(i=0; i<size1; i=i+8)
- {
- togo = size1 - i;
- size = (togo > 8) ? 8 : togo;
- for(j=0; j<size; j++)
- {
- asubsref(a1,j+nave_half) = asubsref(src,i+j);
- }
- }
- a1sum = 0;
- int size2=rows*nave;
- for(i=0; i<size2; i=i+8)
- {
- togo = size2 - i;
- size = (togo > 8) ? 8 : togo;
- for(k=0; k<size; k++)
- {
- a1sum += asubsref(a1,k);
- }
- }
- int size3=rows*cols;
- for(i=0; i<size3; i=i+8)
- {
- togo = size3 - i;
- size = (togo > 8) ? 8 : togo;
- for(j=0; j<size; j++)
- {
- asubsref(ret,i+j) = a1sum;
- a1sum += asubsref(a1,j+nave) - asubsref(a1,j);
- }
- }
- fFreeHandle(a1);
- a1 = fSetArray(1, rows+nave,0);
- for(i=0; i<cols; i++)
- {
- for(j=0; j<rows; j++) {
- asubsref(a1,j+nave_half) = subsref(ret,j,i);
- }
- a1sum = 0;
- for(k=0; k<nave; k++) {
- a1sum += asubsref(a1,k);
- }
- for(j=0; j<rows; j++)
- {
- subsref(ret,j,i) = a1sum;
- a1sum += asubsref(a1,j+nave) - asubsref(a1,j);
- }
- }
- fFreeHandle(a1);
- return ret;
- }
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