mirror of https://github.com/pjreddie/darknet.git
41 lines
1.3 KiB
C
41 lines
1.3 KiB
C
#include "im2col.h"
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#include <stdio.h>
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float im2col_get_pixel(float *im, int height, int width, int channels,
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int row, int col, int channel, int pad)
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{
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row -= pad;
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col -= pad;
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if (row < 0 || col < 0 ||
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row >= height || col >= width) return 0;
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return im[col + width*(row + height*channel)];
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}
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//From Berkeley Vision's Caffe!
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//https://github.com/BVLC/caffe/blob/master/LICENSE
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void im2col_cpu(float* data_im,
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int channels, int height, int width,
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int ksize, int stride, int pad, float* data_col)
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{
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int c,h,w;
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int height_col = (height + 2*pad - ksize) / stride + 1;
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int width_col = (width + 2*pad - ksize) / stride + 1;
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int channels_col = channels * ksize * ksize;
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for (c = 0; c < channels_col; ++c) {
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int w_offset = c % ksize;
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int h_offset = (c / ksize) % ksize;
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int c_im = c / ksize / ksize;
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for (h = 0; h < height_col; ++h) {
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for (w = 0; w < width_col; ++w) {
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int im_row = h_offset + h * stride;
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int im_col = w_offset + w * stride;
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int col_index = (c * height_col + h) * width_col + w;
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data_col[col_index] = im2col_get_pixel(data_im, height, width, channels,
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im_row, im_col, c_im, pad);
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}
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}
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}
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}
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