=== Assignment 2 ===
==== Beginning Information ====
Image used for all of the testing
[[File:Duck.JPG||400px]]
==== Enlarge Image====
==== Shrink Image ====
On the CPU "shrink" took 20,000 microseconds and the GPU took 118 microseconds which shows a speedup of 169.5 times
The following chart graphically shows how this speedup looks:<pre>__global__ void shrinkImg(int* a, int* b, int matrixSize, int shrinkVal, int imgCols, int shrinkCols) { int idx = blockIdx.x * blockDim.x + threadIdx.x; int x = idx / shrinkCols; int y = idx % shrinkCols; if (idx < matrixSize) { a[idx] = b[(x / shrinkVal) * imgCols + (y / shrinkVal)]; }}</pre> ==== Reflect Image==== <pre>// Reflect Image Horizontally__global__ void reflectImgH(int* a, int* b, int rows, int cols) { int i = blockIdx.x * blockDim.x + threadIdx.x; int j = blockIdx.y * blockDim.y + threadIdx.y; //tempImage.pixelVal[rows - (i + 1)][j] = oldImage.pixelVal[i][j]; a[j * cols + (rows - (i + 1))] = b[j * cols + i];
==== Rotate } //Reflect ImageVertically__global__ void reflectImgV(int* a, int* b, int rows, int cols) { int i =blockIdx.x * blockDim.x + threadIdx.x; int j =blockIdx.y * blockDim.y + threadIdx.y; //tempImage.pixelVal[i][cols - (j + 1)] =oldImage.pixelVal[i][j]; a[(cols - (j + 1) * cols) + i] =b[j * cols + i]; }</pre>
==== Translate Image====
<pre>
__global__ void translateImg(int* a, int* b, int cols, int value) {
int i = blockIdx.x * blockDim.x + threadIdx.x;
int j = blockIdx.y * blockDim.y + threadIdx.y;
//tempImage.pixelVal[i + value][j + value] = oldImage.pixelVal[i][j];
a[(j-value) * cols + (i+value)] = b[j * cols + i];
}
</pre>
==== Rotate Image====
On the CPU "rotate" took 40,000 microseconds and the GPU took 123,123 microseconds which shows a speedup of X
The following chart graphically shows how this speedup looks:<pre>__global__ void rotateImg(int* a, int* b, int matrixSize, int imgCols, int imgRows, int r0, int c0, float rads) { int idx = blockIdx.x * blockDim.x + threadIdx.x; int r = idx / imgCols; int c = idx % imgCols; if (idx < matrixSize) { int r1 = (int)(r0 + ((r - r0) * cos(rads)) - ((c - c0) * sin(rads))); int c1 = (int)(c0 + ((r - r0) * sin(rads)) + ((c - c0) * cos(rads))); if (r1 >= imgRows || r1 < 0 || c1 >= imgCols || c1 < 0) { } else { a[c1 * imgCols + r1] = b[c * imgCols + r]; } }} __global__ void rotateImgBlackFix(int* a, int imgCols) { int idx = blockIdx.x * blockDim.x + threadIdx.x; int r = idx / imgCols; int c = idx % imgCols; if (a[c * imgCols + r] == 0) a[c * imgCols + r] = a[(c + 1) * imgCols + r];}</pre>
==== Negate Image====
<pre>
__global__ void negateImg(int* a, int* b, int matrixSize) {
int matrixCol = blockIdx.x * blockDim.x + threadIdx.x;
if(matrixCol < matrixSize)
</pre>
====Results====
[[File:CHART2GOOD.png]]
=== Assignment 3 ===