darknet/src/crop_layer.c

#include "crop_layer.h"
#include "cuda.h"
#include <stdio.h>

image get_crop_image(crop_layer l)
{
    int h = l.out_h;
    int w = l.out_w;
    int c = l.out_c;
    return float_to_image(w,h,c,l.output);
}

crop_layer make_crop_layer(int batch, int h, int w, int c, int crop_height, int crop_width, int flip, float angle, float saturation, float exposure)
{
    fprintf(stderr, "Crop Layer: %d x %d -> %d x %d x %d image\n", h,w,crop_height,crop_width,c);
    crop_layer l = {0};
    l.type = CROP;
    l.batch = batch;
    l.h = h;
    l.w = w;
    l.c = c;
    l.flip = flip;
    l.angle = angle;
    l.saturation = saturation;
    l.exposure = exposure;
    l.crop_width = crop_width;
    l.crop_height = crop_height;
    l.out_w = crop_width;
    l.out_h = crop_height;
    l.out_c = c;
    l.inputs = l.w * l.h * l.c;
    l.outputs = l.out_w * l.out_h * l.out_c;
    l.output = calloc(crop_width*crop_height * c*batch, sizeof(float));
    #ifdef GPU
    l.output_gpu = cuda_make_array(l.output, crop_width*crop_height*c*batch);
    l.rand_gpu = cuda_make_array(0, l.batch*8);
    #endif
    return l;
}

void forward_crop_layer(const crop_layer l, network_state state)
{
    int i,j,c,b,row,col;
    int index;
    int count = 0;
    int flip = (l.flip && rand()%2);
    int dh = rand()%(l.h - l.crop_height + 1);
    int dw = rand()%(l.w - l.crop_width + 1);
    float scale = 2;
    float trans = -1;
    if(!state.train){
        flip = 0;
        dh = (l.h - l.crop_height)/2;
        dw = (l.w - l.crop_width)/2;
    }
    for(b = 0; b < l.batch; ++b){
        for(c = 0; c < l.c; ++c){
            for(i = 0; i < l.crop_height; ++i){
                for(j = 0; j < l.crop_width; ++j){
                    if(flip){
                        col = l.w - dw - j - 1;    
                    }else{
                        col = j + dw;
                    }
                    row = i + dh;
                    index = col+l.w*(row+l.h*(c + l.c*b)); 
                    l.output[count++] = state.input[index]*scale + trans;
                }
            }
        }
    }
}