annotate util/ksvd utils/im2colstep.c @ 247:ecce33192fcc tip

Added tag ver_2.1 for changeset cef4500b936f
author luisf <luis.figueira@eecs.qmul.ac.uk>
date Wed, 31 Oct 2012 12:24:44 +0000
parents c3eca463202d
children
rev   line source
idamnjanovic@70 1 /**************************************************************************
idamnjanovic@70 2 *
idamnjanovic@70 3 * File name: im2colstep.c
idamnjanovic@70 4 *
idamnjanovic@70 5 * Ron Rubinstein
idamnjanovic@70 6 * Computer Science Department
idamnjanovic@70 7 * Technion, Haifa 32000 Israel
idamnjanovic@70 8 * ronrubin@cs
idamnjanovic@70 9 *
idamnjanovic@70 10 * Last Updated: 31.8.2009
idamnjanovic@70 11 *
idamnjanovic@70 12 *************************************************************************/
idamnjanovic@70 13
idamnjanovic@70 14
idamnjanovic@70 15 #include "mex.h"
idamnjanovic@70 16 #include <string.h>
idamnjanovic@70 17
idamnjanovic@70 18
idamnjanovic@70 19 /* Input Arguments */
idamnjanovic@70 20
idamnjanovic@70 21 #define X_IN prhs[0]
idamnjanovic@70 22 #define SZ_IN prhs[1]
idamnjanovic@70 23 #define S_IN prhs[2]
idamnjanovic@70 24
idamnjanovic@70 25
idamnjanovic@70 26 /* Output Arguments */
idamnjanovic@70 27
idamnjanovic@70 28 #define B_OUT plhs[0]
idamnjanovic@70 29
idamnjanovic@70 30
idamnjanovic@70 31 void mexFunction(int nlhs, mxArray *plhs[],
idamnjanovic@70 32 int nrhs, const mxArray*prhs[])
idamnjanovic@70 33
idamnjanovic@70 34 {
idamnjanovic@70 35 double *x, *b, *s;
idamnjanovic@70 36 mwSize sz[3], stepsize[3], n[3], ndims;
idamnjanovic@70 37 mwIndex i, j, k, l, m, blocknum;
idamnjanovic@70 38
idamnjanovic@70 39
idamnjanovic@70 40 /* Check for proper number of arguments */
idamnjanovic@70 41
idamnjanovic@70 42 if (nrhs < 2 || nrhs > 3) {
idamnjanovic@70 43 mexErrMsgTxt("Invalid number of input arguments.");
idamnjanovic@70 44 } else if (nlhs > 1) {
idamnjanovic@70 45 mexErrMsgTxt("Too many output arguments.");
idamnjanovic@70 46 }
idamnjanovic@70 47
idamnjanovic@70 48
idamnjanovic@70 49 /* Check the the input dimensions */
idamnjanovic@70 50
idamnjanovic@70 51 ndims = mxGetNumberOfDimensions(X_IN);
idamnjanovic@70 52
idamnjanovic@70 53 if (!mxIsDouble(X_IN) || mxIsComplex(X_IN) || ndims>3) {
idamnjanovic@70 54 mexErrMsgTxt("X should be a 2-D or 3-D double matrix.");
idamnjanovic@70 55 }
idamnjanovic@70 56 if (!mxIsDouble(SZ_IN) || mxIsComplex(SZ_IN) || mxGetNumberOfDimensions(SZ_IN)>2 || mxGetM(SZ_IN)*mxGetN(SZ_IN)!=ndims) {
idamnjanovic@70 57 mexErrMsgTxt("Invalid block size.");
idamnjanovic@70 58 }
idamnjanovic@70 59 if (nrhs == 3) {
idamnjanovic@70 60 if (!mxIsDouble(S_IN) || mxIsComplex(S_IN) || mxGetNumberOfDimensions(S_IN)>2 || mxGetM(S_IN)*mxGetN(S_IN)!=ndims) {
idamnjanovic@70 61 mexErrMsgTxt("Invalid step size.");
idamnjanovic@70 62 }
idamnjanovic@70 63 }
idamnjanovic@70 64
idamnjanovic@70 65
idamnjanovic@70 66 /* Get parameters */
idamnjanovic@70 67
idamnjanovic@70 68 s = mxGetPr(SZ_IN);
idamnjanovic@70 69 if (s[0]<1 || s[1]<1 || (ndims==3 && s[2]<1)) {
idamnjanovic@70 70 mexErrMsgTxt("Invalid block size.");
idamnjanovic@70 71 }
idamnjanovic@70 72 sz[0] = (mwSize)(s[0] + 0.01);
idamnjanovic@70 73 sz[1] = (mwSize)(s[1] + 0.01);
idamnjanovic@70 74 sz[2] = ndims==3 ? (mwSize)(s[2] + 0.01) : 1;
idamnjanovic@70 75
idamnjanovic@70 76 if (nrhs == 3) {
idamnjanovic@70 77 s = mxGetPr(S_IN);
idamnjanovic@70 78 if (s[0]<1 || s[1]<1 || (ndims==3 && s[2]<1)) {
idamnjanovic@70 79 mexErrMsgTxt("Invalid step size.");
idamnjanovic@70 80 }
idamnjanovic@70 81 stepsize[0] = (mwSize)(s[0] + 0.01);
idamnjanovic@70 82 stepsize[1] = (mwSize)(s[1] + 0.01);
idamnjanovic@70 83 stepsize[2] = ndims==3 ? (mwSize)(s[2] + 0.01) : 1;
idamnjanovic@70 84 }
idamnjanovic@70 85 else {
idamnjanovic@70 86 stepsize[0] = stepsize[1] = stepsize[2] = 1;
idamnjanovic@70 87 }
idamnjanovic@70 88
idamnjanovic@70 89 n[0] = (mxGetDimensions(X_IN))[0];
idamnjanovic@70 90 n[1] = (mxGetDimensions(X_IN))[1];
idamnjanovic@70 91 n[2] = ndims==3 ? (mxGetDimensions(X_IN))[2] : 1;
idamnjanovic@70 92
idamnjanovic@70 93 if (n[0]<sz[0] || n[1]<sz[1] || (ndims==3 && n[2]<sz[2])) {
idamnjanovic@70 94 mexErrMsgTxt("Block size too large.");
idamnjanovic@70 95 }
idamnjanovic@70 96
idamnjanovic@70 97
idamnjanovic@70 98 /* Create a matrix for the return argument */
idamnjanovic@70 99
idamnjanovic@70 100 B_OUT = mxCreateDoubleMatrix(sz[0]*sz[1]*sz[2], ((n[0]-sz[0])/stepsize[0]+1)*((n[1]-sz[1])/stepsize[1]+1)*((n[2]-sz[2])/stepsize[2]+1), mxREAL);
idamnjanovic@70 101
idamnjanovic@70 102
idamnjanovic@70 103 /* Assign pointers */
idamnjanovic@70 104
idamnjanovic@70 105 x = mxGetPr(X_IN);
idamnjanovic@70 106 b = mxGetPr(B_OUT);
idamnjanovic@70 107
idamnjanovic@70 108
idamnjanovic@70 109 /* Do the actual computation */
idamnjanovic@70 110
idamnjanovic@70 111 blocknum = 0;
idamnjanovic@70 112
idamnjanovic@70 113 /* iterate over all blocks */
idamnjanovic@70 114 for (k=0; k<=n[2]-sz[2]; k+=stepsize[2]) {
idamnjanovic@70 115 for (j=0; j<=n[1]-sz[1]; j+=stepsize[1]) {
idamnjanovic@70 116 for (i=0; i<=n[0]-sz[0]; i+=stepsize[0]) {
idamnjanovic@70 117
idamnjanovic@70 118 /* copy single block */
idamnjanovic@70 119 for (m=0; m<sz[2]; m++) {
idamnjanovic@70 120 for (l=0; l<sz[1]; l++) {
idamnjanovic@70 121 memcpy(b + blocknum*sz[0]*sz[1]*sz[2] + m*sz[0]*sz[1] + l*sz[0], x+(k+m)*n[0]*n[1]+(j+l)*n[0]+i, sz[0]*sizeof(double));
idamnjanovic@70 122 }
idamnjanovic@70 123 }
idamnjanovic@70 124 blocknum++;
idamnjanovic@70 125
idamnjanovic@70 126 }
idamnjanovic@70 127 }
idamnjanovic@70 128 }
idamnjanovic@70 129
idamnjanovic@70 130 return;
idamnjanovic@70 131 }