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- // statistical kernel
- __global__ void compress( long d_Ne,
- fp *d_I){ // pointer to output image (DEVICE GLOBAL MEMORY)
- // indexes
- int bx = blockIdx.x; // get current horizontal block index
- int tx = threadIdx.x; // get current horizontal thread index
- int ei = (bx*NUMBER_THREADS)+tx; // unique thread id, more threads than actual elements !!!
- // copy input to output & log uncompress
- if(ei<d_Ne){ // do only for the number of elements, omit extra threads
- d_I[ei] = log(d_I[ei])*255; // exponentiate input IMAGE and copy to output image
- }
- }
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