#include<iostream>
#include <string>
#include <list>
#include <vector>
#include <map>
#include <stack>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/highgui/highgui.hpp>
using namespace std;
void Seed_Filling(const cv::Mat& binImg, cv::Mat& lableImg) //种子填充法
{
// 4邻接方法
if (binImg.empty() ||
binImg.type() != CV_8UC1)
{
return;
}
lableImg.release();
binImg.convertTo(lableImg, CV_32SC1);
int label = 1;
int rows = binImg.rows - 1;
int cols = binImg.cols - 1;
for (int i = 1; i < rows-1; i++)
{
int* data= lableImg.ptr<int>(i);
for (int j = 1; j < cols-1; j++)
{
if (data[j] == 1)
{
std::stack<std::pair<int,int>> neighborPixels;
neighborPixels.push(std::pair<int,int>(i,j)); // 像素位置: <i,j>
++label; // 没有重复的团,开始新的标签
while (!neighborPixels.empty())
{
std::pair<int,int> curPixel = neighborPixels.top(); //如果与上一行中一个团有重合区域,则将上一行的那个团的标号赋给它
int curX = curPixel.first;
int curY = curPixel.second;
lableImg.at<int>(curX, curY) = label;
neighborPixels.pop();
if (lableImg.at<int>(curX, curY-1) == 1)
{//左边
neighborPixels.push(std::pair<int,int>(curX, curY-1));
}
if (lableImg.at<int>(curX, curY+1) == 1)
{// 右边
neighborPixels.push(std::pair<int,int>(curX, curY+1));
}
if (lableImg.at<int>(curX-1, curY) == 1)
{// 上边
neighborPixels.push(std::pair<int,int>(curX-1, curY));
}
if (lableImg.at<int>(curX+1, curY) == 1)
{// 下边
neighborPixels.push(std::pair<int,int>(curX+1, curY));
}
}
}
}
}
}
void Two_Pass(const cv::Mat& binImg, cv::Mat& lableImg) //两遍扫描法
{
if (binImg.empty() ||
binImg.type() != CV_8UC1)
{
return;
}
// 第一个通路
lableImg.release();
binImg.convertTo(lableImg, CV_32SC1);
int label = 1;
std::vector<int> labelSet;
labelSet.push_back(0);
labelSet.push_back(1);
int rows = binImg.rows - 1;
int cols = binImg.cols - 1;
for (int i = 1; i < rows; i++)
{
int* data_preRow = lableImg.ptr<int>(i-1);
int* data_curRow = lableImg.ptr<int>(i);
for (int j = 1; j < cols; j++)
{
if (data_curRow[j] == 1)
{
std::vector<int> neighborLabels;
neighborLabels.reserve(2);
int leftPixel = data_curRow[j-1];
int upPixel = data_preRow[j];
if ( leftPixel > 1)
{
neighborLabels.push_back(leftPixel);
}
if (upPixel > 1)
{
neighborLabels.push_back(upPixel);
}
if (neighborLabels.empty())
{
labelSet.push_back(++label); // 不连通,标签+1
data_curRow[j] = label;
labelSet[label] = label;
}
else
{
std::sort(neighborLabels.begin(), neighborLabels.end());
int smallestLabel = neighborLabels[0];
data_curRow[j] = smallestLabel;
// 保存最小等价表
for (size_t k = 1; k < neighborLabels.size(); k++)
{
int tempLabel = neighborLabels[k];
int& oldSmallestLabel = labelSet[tempLabel];
if (oldSmallestLabel > smallestLabel)
{
labelSet[oldSmallestLabel] = smallestLabel;
oldSmallestLabel = smallestLabel;
}
else if (oldSmallestLabel < smallestLabel)
{
labelSet[smallestLabel] = oldSmallestLabel;
}
}
}
}
}
}
// 更新等价对列表
// 将最小标号给重复区域
for (size_t i = 2; i < labelSet.size(); i++)
{
int curLabel = labelSet[i];
int preLabel = labelSet[curLabel];
while (preLabel != curLabel)
{
curLabel = preLabel;
preLabel = labelSet[preLabel];
}
labelSet[i] = curLabel;
} ;
for (int i = 0; i < rows; i++)
{
int* data = lableImg.ptr<int>(i);
for (int j = 0; j < cols; j++)
{
int& pixelLabel = data[j];
pixelLabel = labelSet[pixelLabel];
}
}
}
//彩色显示
cv::Scalar GetRandomColor()
{
uchar r = 255 * (rand()/(1.0 + RAND_MAX));
uchar g = 255 * (rand()/(1.0 + RAND_MAX));
uchar b = 255 * (rand()/(1.0 + RAND_MAX));
return cv::Scalar(b,g,r);
}
void LabelColor(const cv::Mat& labelImg, cv::Mat& colorLabelImg)
{
if (labelImg.empty() ||
labelImg.type() != CV_32SC1)
{
return;
}
std::map<int, cv::Scalar> colors;
int rows = labelImg.rows;
int cols = labelImg.cols;
colorLabelImg.release();
colorLabelImg.create(rows, cols, CV_8UC3);
colorLabelImg = cv::Scalar::all(0);
for (int i = 0; i < rows; i++)
{
const int* data_src = (int*)labelImg.ptr<int>(i);
uchar* data_dst = colorLabelImg.ptr<uchar>(i);
for (int j = 0; j < cols; j++)
{
int pixelValue = data_src[j];
if (pixelValue > 1)
{
if (colors.count(pixelValue) <= 0)
{
colors[pixelValue] = GetRandomColor();
}
cv::Scalar color = colors[pixelValue];
*data_dst++ = color[0];
*data_dst++ = color[1];
*data_dst++ = color[2];
}
else
{
data_dst++;
data_dst++;
data_dst++;
}
}
}
}
int main()
{
cv::Mat binImage = cv::imread("test.jpg", 0);
cv::threshold(binImage, binImage, 50, 1, CV_THRESH_BINARY_INV);
cv::Mat labelImg;
Two_Pass(binImage, labelImg, num);
//Seed_Filling(binImage, labelImg);
//彩色显示
cv::Mat colorLabelImg;
LabelColor(labelImg, colorLabelImg);
cv::imshow("colorImg", colorLabelImg);
/* //灰度显示
cv::Mat grayImg;
labelImg *= 10;
labelImg.convertTo(grayImg, CV_8UC1);
cv::imshow("labelImg", grayImg);
*/
cv::waitKey(0);
return 0;
}
opencv标记法实现连通区域
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2015-09-16
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