/
runlength.cpp
294 lines (242 loc) · 6.15 KB
/
runlength.cpp
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#include "runlength.h"
using namespace std;
using namespace cv;
namespace runlength{
float pyramid[21][4] = {
0, 1, 0, 1, //1 x 1
0, 0.5, 0, 0.5, //2 x 2
0, 0.5, 0.5, 1,
0.5, 1, 0, 0.5,
0.5, 1, 0.5, 1,
0, 0.25, 0, 0.25, //4 x 4
0, 0.25, 0.25, 0.5,
0, 0.25, 0.5, 0.75,
0, 0.25, 0.75, 1,
0.25, 0.5, 0, 0.25,
0.25, 0.5, 0.25, 0.5,
0.25, 0.5, 0.5, 0.75,
0.25, 0.5, 0.75, 1,
0.5, 0.75, 0, 0.25,
0.5, 0.75, 0.25, 0.5,
0.5, 0.75, 0.5, 0.75,
0.5, 0.75, 0.75, 1,
0.75, 1, 0, 0.25,
0.75, 1, 0.25, 0.5,
0.75, 1, 0.5, 0.75,
0.75, 1, 0.75, 1
};
#define nPIXELS 500000.0
int LUT0[] = { 0, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7 };
#define LENGTH2BIN(P) ((P) >128?8:LUT0[(P)-1])
/* 构造函数*/
RunLength::RunLength(Mat image_input){
rows = image_input.rows;
cols = image_input.cols;
image_in = image_input;
double factor = sqrt(nPIXELS / (cols*rows));
ncols = cvRound(cols*factor);
nrows = cvRound(rows*factor);
width_height = Mat(1, 4, CV_32F);
float width_height_0[4] = { ncols, ncols, nrows, nrows };
for (int i = 0; i < width_height.cols; i++)
width_height.at<float>(0, i) = *(width_height_0 + i);
Pyramid = Mat(21, 4, CV_32F);
InitMat(Pyramid, pyramid);
}
/* 析构函数*/
RunLength::~RunLength(){
}
/* 图像归一化为固定像素点个数*/
void RunLength::img_resize(){
cv::resize(image_in, image_resize, Size(ncols, nrows), 0, 0, CV_INTER_LINEAR);
}
/* mat to vector*/
void RunLength::mat2vector(cv::Mat in, int* matrix){
int count = 0;
for (int i = 0; i < in.rows; i++)
for (int j = 0; j < in.cols; j++){
int x = (int)in.at<uchar>(i, j);
if (x == 0)
matrix[count++] = 0;
else
matrix[count++] = 1;
}
}
void RunLength::DoVerticalRunlength(int h, int w, int *im, int *RL)
{
int x, y;
int *p;
int currentV, currentL;
for (x = 0; x < w; ++x)
{
p = &im[x*h];
currentV = *p;
currentL = 1;
p++;
for (y = 1; y < h; ++y, ++p)
{
if (*p == currentV)
currentL++;
else
{
RL[(9 * currentV) + LENGTH2BIN(currentL)]++;
currentV = *p;
currentL = 1;
}
}
int tmp = LENGTH2BIN(currentL);
RL[(9 * currentV) + LENGTH2BIN(currentL)]++;
}
}
void RunLength::DoHorizontalRunlength(int h, int w, int *im, int *RL)
{
int x, y;
int *p;
int currentV, currentL;
for (y = 0; y < h; ++y)
{
p = &im[y];
currentV = *p;
currentL = 1;
p += h;
for (x = 1; x < w; ++x, p += h)
{
if (*p == currentV)
currentL++;
else
{
RL[(9 * currentV) + LENGTH2BIN(currentL)]++;
currentV = *p;
currentL = 1;
}
}
RL[(9 * currentV) + LENGTH2BIN(currentL)]++;
}
}
void RunLength::DoDiagonalRunlength(int h, int w, int *im, int *RL)
{
int x, y;
int ty, tx;
int currentV, currentL;
//Two passes, from up to down and then from left to right
for (y = 0; y < h; ++y)
{
ty = y;
currentV = im[y];
currentL = 1;
for (x = 1; x < w && ty < h; ++x, ++ty)
{
if (im[ty + x*h] == currentV)
currentL++;
else
{
RL[(9 * currentV) + LENGTH2BIN(currentL)]++;
currentV = im[ty + x*h];
currentL = 1;
}
}
RL[(9 * currentV) + LENGTH2BIN(currentL)]++;
}
for (x = 1; x < w; ++x)
{
tx = x;
currentV = im[x*h];
currentL = 1;
for (y = 1; y < h && tx < w; ++y, ++tx)
{
if (im[y + tx*h] == currentV)
currentL++;
else
{
RL[(9 * currentV) + LENGTH2BIN(currentL)]++;
currentV = im[y + tx*h];
currentL = 1;
}
}
RL[(9 * currentV) + LENGTH2BIN(currentL)]++;
}
}
void RunLength::DoAntiDiagonalRunlength(int h, int w, int *im, int *RL)
{
int x, y;
int ty, tx;
int currentV, currentL;
//Two passes, from up to down and then from left to right
for (y = 0; y < h; ++y)
{
ty = y;
currentV = im[(w - 1)*h + y];
currentL = 1;
for (x = w - 1; x >= 0 && ty < h; --x, ++ty)
{
if (im[ty + x*h] == currentV)
currentL++;
else
{
RL[(9 * currentV) + LENGTH2BIN(currentL)]++;
currentV = im[ty + x*h];
currentL = 1;
}
}
RL[(9 * currentV) + LENGTH2BIN(currentL)]++;
}
for (x = (w - 2); x >= 0; --x)
{
tx = x;
currentV = im[x*h];
currentL = 1;
for (y = 1; y < h && tx >= 0; ++y, --tx)
{
if (im[y + tx*h] == currentV)
currentL++;
else
{
RL[(9 * currentV) + LENGTH2BIN(currentL)]++;
currentV = im[y + tx*h];
currentL = 1;
}
}
RL[(9 * currentV) + LENGTH2BIN(currentL)]++;
}
}
/* 提取runlength 特征*/
void RunLength::Dorunlength(float* feature){
img_resize();
/* 二值化 */
adaptiveThreshold(image_resize, image_binary, 255, CV_ADAPTIVE_THRESH_GAUSSIAN_C, CV_THRESH_BINARY, 31, 15);
Mat _Pyramid = Mat(1, 4, CV_32F);
Mat coords = Mat(1, 4, CV_32F);
for (int i = 0; i < Pyramid.rows; i++){
_Pyramid = Pyramid(Rect(0, i, 4, 1));
coords = _Pyramid.mul(width_height);
int x1 = (int)coords.at<float>(0, 0);
int x2 = (int)coords.at<float>(0, 1);
int y1 = (int)coords.at<float>(0, 2);
int y2 = (int)coords.at<float>(0, 3);
Mat test = image_binary(Range(y1, y2), Range(x1, x2));
runlength_encoding(test, &feature[72 * i]);
}
}
void RunLength::runlength_encoding(cv::Mat im, float* output){
int l = im.rows*im.cols;
int* a = new int[im.rows*im.cols];
mat2vector(im, a);
int* RL = new int[72];
for (int i = 0; i < 72; i++)
RL[i] = 0;
int width = im.cols;
int heigth = im.rows;
DoVerticalRunlength(width, heigth, a, RL);
DoHorizontalRunlength(width, heigth, a, &RL[18]);
DoDiagonalRunlength(width, heigth, a, &RL[36]);
DoAntiDiagonalRunlength(width, heigth, a, &RL[54]);
_Copy_impl(RL, RL + 72, output);
delete[] a;
delete[] RL;
}
void RunLength::InitMat(Mat& m, float(*p)[4]){
for (int i = 0; i < m.rows; i++)
for (int j = 0; j < m.cols; j++)
m.at<float>(i, j) = *(*(p + i) + j);
}
}