下采样downsampling接口。

接口定义

C interface：

void dsImage_cpu(float* out, const float* in, float *tmp, const float* filter, int filter_width, int n, int m);

参数

参数名	类型	描述	输入/输出
out	float类型	下采样最终结果输出	输出
in	float类型	输入数据	输入
tmp	float类型	下采样中间结果输出	输出
filter	float类型	滤波器	输入
filter_width	int类型	滤波器的长度	输入
n	int类型	输入数据的宽度	输入
m	int类型	输入数据的高度	输入

依赖

#include "conv.h"

示例

C interface：

    int n = 12;
    int m = 12;
    float in[144] = {1.0, 8.0, 2.0, 14.0, 3.0, 20.0, 4.0, 26.0, 5.0, 32.0, 6.0, 17.0,
                     23.0, 130.0, 28.0, 178.0, 33.0, 208.0, 38.0, 238.0, 43.0, 268.0, 48.0, 139.0,
                     7.0, 38.0, 8.0, 50.0, 9.0, 56.0, 10.0, 62.0, 11.0, 68.0, 12.0, 35.0,
                     54.0, 288.0, 60.0, 372.0, 66.0, 408.0, 72.0, 444.0, 78.0, 480.0, 84.0, 246.0,
                     13.0, 68.0, 14.0, 86.0, 15.0, 92.0, 16.0, 98.0, 17.0, 104.0, 18.0, 53.0,
                     90.0, 468.0, 96.0, 588.0, 102.0, 624.0, 108.0, 660.0, 114.0, 696.0, 120.0, 354.0,
                     19.0, 98.0, 20.0, 122.0, 21.0, 128.0, 22.0, 134.0, 23.0, 140.0, 24.0, 71.0,
                     126.0, 648.0, 132.0, 804.0, 138.0, 840.0, 144.0, 876.0, 150.0, 912.0, 156.0, 462.0,
                     25.0, 128.0, 26.0, 158.0, 27.0, 164.0, 28.0, 170.0, 29.0, 176.0, 30.0, 89.0,
                     162.0, 828.0, 168.0, 1020.0, 174.0, 1056.0, 180.0, 1092.0, 186.0, 1128.0, 192.0, 570.0,
                     31.0, 158.0, 32.0, 194.0, 33.0, 200.0, 34.0, 206.0, 35.0, 212.0, 36.0, 107.0,
                     87.0, 444.0, 90.0, 546.0, 93.0, 564.0, 96.0, 582.0, 99.0, 600.0, 102.0, 303.0, };
    int filter_width = 3;
    float filter[3] = {0.0, 1.0, 0.0};
    float tmp[72] = {0.0};
    /*
     * tmp size is m x [n/2]
     */
    float out[36] = {0.0};
    /*
     * output size is [m/2] x [n/2]
     */

    dsImage_cpu(out, in, tmp, filter, filter_width, n, m);
    /*
     * tmp = [1.0 2.0 3.0 4.0 5.0 6.0 
     *        23.0 28.0 33.0 38.0 43.0 48.0 
     *        7.0 8.0 9.0 10.0 11.0 12.0 
     *        54.0 60.0 66.0 72.0 78.0 84.0 
     *        13.0 14.0 15.0 16.0 17.0 18.0 
     *        90.0 96.0 102.0 108.0 114.0 120.0 
     *        19.0 20.0 21.0 22.0 23.0 24.0 
     *        126.0 132.0 138.0 144.0 150.0 156.0 
     *        25.0 26.0 27.0 28.0 29.0 30.0 
     *        162.0 168.0 174.0 180.0 186.0 192.0]
     *
     * out = [1.0 2.0 3.0 4.0 5.0 6.0
     *        7.0 8.0 9.0 10.0 11.0 12.0 
     *        13.0 14.0 15.0 16.0 17.0 18.0 
     *        19.0 20.0 21.0 22.0 23.0 24.0 
     *        25.0 26.0 27.0 28.0 29.0 30.0]
     */