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whellvalue/src/algorithm/ImageProcess.cpp

588 lines
19 KiB
C++

5 years ago
#include "ImageProcess.h"
#include "qstring.h"
#include "CVUtils.h"
#include "ED.h"
#include "EDLines.h"
#include "EDCircles.h"
//摩轮宏定义 表示该算法用于摩轮型号识别检测
#define MOTO_DETECT
ImageProcess::ImageProcess()
{
}
ImageProcess::~ImageProcess()
{
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}
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Mat _EnhanImg_sharpen(const Mat &img) {
int mGainValue = 3;
float amount = mGainValue * 0.5f;
Mat blurred;
int mSmoothValue = 3;
GaussianBlur(img, blurred, Size(), mSmoothValue);
Mat lowContrastMask = abs(img - blurred) < 5;
Mat orResult = img * (1 + amount) + blurred * (-amount);
img.copyTo(orResult, lowContrastMask);
Mat openMat = orResult.clone();
return openMat;
}
Mat findEdge2(const Mat &Src)
{
Mat ret = Src.clone();
Mat kernel = (Mat_<float>(5, 5) <<
-1, -1, -1, -1, -1,
-1, -1, -1, -1, -1,
-1, -1, 24, -1, -1,
-1, -1, -1, -1, -1,
-1, -1, -1, -1, -1);
filter2D(Src, ret, CV_8UC1, kernel);
return ret;
}
#define REAIZE 2
cv::Mat ImageProcess::findCircleObject(const Mat &srcImg, const Mat& backgroundImg, bool useBackgroundFlag, int nThres /*= 20*/, luffy_base::luffyCircle *pCircle /*= NULL*/)
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{
#ifdef MOTO_DETECT//摩轮型号识别抠图算法
if (!useBackgroundFlag)
{
Mat detectImg;
Mat src = srcImg(Rect(435, 53, 1721, 1824));
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cv::resize(src, detectImg, cv::Size(src.cols / REAIZE, src.rows / REAIZE));
int bBaseX = detectImg.cols;
int bBaseY = detectImg.rows;
//if (nThres<=1)
equalizeHist(detectImg, detectImg);
detectImg = _EnhanImg_sharpen(detectImg);
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EDCircles edcircles(detectImg);
vector<mCircle> EDCircle = edcircles.getCircles();
double maxR = 0;
int nIndex = -1;
for (int i = 0; i < EDCircle.size(); i++)
{
int startX = EDCircle[i].center.x - EDCircle[i].r;
int startY = EDCircle[i].center.y - EDCircle[i].r;
if (startX < 0 || startY < 0)
continue;
if (EDCircle[i].center.x + EDCircle[i].r > bBaseX || EDCircle[i].center.y + EDCircle[i].r > bBaseY)
continue;
if (EDCircle[i].r > maxR)
{
maxR = EDCircle[i].r;
nIndex = i;
}
}
if (nIndex != -1)
{
int startX = EDCircle[nIndex].center.x * REAIZE - EDCircle[nIndex].r * REAIZE;
int startY = EDCircle[nIndex].center.y * REAIZE - EDCircle[nIndex].r* REAIZE;
double radius = EDCircle[nIndex].r;
int hight = 2 * radius * REAIZE;
if (startX > 0 && startY > 0 && hight > 0 \
&& startX < src.cols &&startY < src.rows \
&&hight < src.cols&&hight < src.rows \
&& startX + hight < src.cols && startY + hight < src.rows)
{
Mat cutMat = src(Rect(startX, startY, hight, hight));
if (cutMat.data != NULL)
{
//Mat dst;
//double rate = src.cols*1.0 / ALG_RESIZE_IMAGE_WIDTH;
//const cv::Size cSize = cv::Size(cutMat.cols*1.0 / rate, cutMat.rows*1.0 / rate);
//cv::resize(cutMat, dst, cSize);
if (hight < 50)
return Mat();
cv::Point2d center;
center.x = EDCircle[nIndex].center.x * REAIZE;
center.y = EDCircle[nIndex].center.y * REAIZE;
pCircle->ptCenter = center;
//float fScale = src.cols / ALG_RESIZE_IMAGE_WIDTH;
//pCircle->fRadius = hight*1.0 / fScale;
pCircle->fRadius = radius * REAIZE;
//2021-05-10 增加图像大小判断 对超过900像素的图像进行再一次压缩
if (cutMat.cols >= 900 || cutMat.rows >= 900)
{
Mat newCutImg;
cv::resize(cutMat, newCutImg, cv::Size(cutMat.cols / REAIZE, cutMat.rows / REAIZE));
pCircle->fRadius = pCircle->fRadius / REAIZE;
return newCutImg;
}
return cutMat;
}
}
}
return Mat();
}
else
{
Mat src = srcImg;
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if (src.empty() || backgroundImg.empty() || src.rows < 500) {
return Mat();
}
assert(backgroundImg.type() == CV_8UC1);
Mat imgTmp, imgBinary;
const cv::Size cSize = cv::Size(ALG_RESIZE_IMAGE_WIDTH, floorf(ALG_RESIZE_IMAGE_WIDTH / (float)src.cols*(float)src.rows));
cv::resize(src, imgTmp, cSize);
Mat foregroundImg = getForeImage(imgTmp, backgroundImg);// 0421
using namespace luffy_base;
luffy_threshold::Threshold(foregroundImg, imgBinary, nThres);//0421
Mat dilatedImgBin;
dilate(imgBinary, dilatedImgBin, Mat::ones(21, 21, CV_32FC1));
erode(dilatedImgBin, imgBinary, Mat::ones(21, 21, CV_32FC1));
openOper(imgBinary, Mat::ones(1, 11, CV_32FC1));
vector<vector<Point>> conts;
cv::findContours(imgBinary, conts, RETR_EXTERNAL, CHAIN_APPROX_NONE);
imgBinary.setTo(0);
for (int i = 0; i < conts.size(); i++) {
const vector<Point> &pt = conts.at(i);
if (pt.size() < 20) {
continue;
}
Rect rt = boundingRect(pt);
if (rt.width < 5 || rt.height < 5) {
continue;
}
drawContours(imgBinary, conts, i, Scalar::all(255), -1);
}
Mat hit; vector<Point> pts;
luffy_hit::firstHit4Circle(imgBinary, hit, pts, Point(cSize.width / 2, cSize.height / 2), 0, cSize.width / 2, 360, luffy_hit::emHitOut2In);
int nMinFitNum = 100;
luffy_imageProc::RansacParam rs(0.01, 3, 150, nMinFitNum, 240);
vector<Point> pts2 = luffy_imageProc::fitModelbyRansac(pts, luffy_imageProc::emModelCircle, &rs);
float fRadius;
Point2f ptCenter;
bool bFind = luffy_imageProc::lsCircleFit(pts2, fRadius, ptCenter);
if (!bFind) {
return Mat();
}
Mat dst;
const int nOffset = 1;
fRadius += nOffset;
Rect rt(ptCenter.x - fRadius + nOffset, ptCenter.y - fRadius + nOffset, 2 * fRadius, 2 * fRadius);
rt &= Rect(0, 0, imgTmp.cols, imgTmp.rows);
imgTmp(rt).copyTo(dst);
static int nCount = cv::getTickCount();
if (pCircle) {
/*float fScale = src.cols / ALG_RESIZE_IMAGE_WIDTH;
Mat matBig = src - backgroundImg;
pCircle->fRadius = fRadius * fScale;
pCircle->ptCenter = Point(ptCenter.x * fScale, ptCenter.y * fScale);
Rect rt(pCircle->ptCenter.x - pCircle->fRadius + nOffset, pCircle->ptCenter.y - pCircle->fRadius + nOffset, 2 * pCircle->fRadius, 2 * pCircle->fRadius);
rt &= Rect(0, 0, matBig.cols, matBig.rows);
src(rt).copyTo(dst);*/
float fScale = src.cols / ALG_RESIZE_IMAGE_WIDTH;
Mat matBig = src - backgroundImg;
pCircle->fRadius = fRadius * fScale;
pCircle->ptCenter = Point(ptCenter.x * fScale, ptCenter.y * fScale);
Mat matBinary;
luffy_threshold::Threshold(matBig, matBinary, nThres);
// add
openOper(matBinary, Mat::ones(3, 3, CV_32FC1));
Mat hit; vector<Point> pts;
luffy_hit::firstHit4Circle(matBinary, hit, pts, pCircle->ptCenter, 0, pCircle->fRadius + 20, 360, luffy_hit::emHitOut2In);//luffy_hit::emHitOut2In
std::map<double, cv::Point> mp;
std::for_each(pts.begin(), pts.end(), [&](Point p) {
double dis = fabs(luffy_math::disofPoints(pCircle->ptCenter, p));
mp[dis] = p;
});
const int bound = 200;
//int startIndex = mp.size() - bound;
std::map<double, cv::Point>::iterator it = mp.begin();
//std::advance(it, startIndex);
std::vector<cv::Point> ppts;
int i = 0;
for (it; it != mp.end(); ++it, ++i)
{
if (i == bound) break;
ppts.push_back(it->second);
}
luffy_imageProc::RansacParam rs(0.01, 5.0, 300, 70, 120);
vector<Point> pts2 = luffy_imageProc::fitModelbyRansac(ppts, luffy_imageProc::emModelCircle, &rs);
float fRadius2;
Point2f ptCenter2;
bool bFind = luffy_imageProc::lsCircleFit(pts2, fRadius2, ptCenter2);
if (bFind) {
pCircle->fRadius = fRadius2;
pCircle->ptCenter = ptCenter2;
Rect rt(ptCenter2.x - fRadius2 + nOffset, ptCenter2.y - fRadius2 + nOffset, 2 * fRadius2, 2 * fRadius2);
if (rt.x < 0 || rt.y < 0 || rt.x + rt.width > matBinary.cols || rt.y + rt.height > matBinary.rows) {
return Mat();
}
rt &= Rect(0, 0, matBinary.cols, matBinary.rows);
src(rt).copyTo(dst);
}
else
{
return Mat();
}
}
return dst;
}
#else//汽轮型号识别抠图算法
/*
2020-06-19 使
使EDCircle2.5
(),
使EDCircle
使()
*/
if (src.empty() || backgroundImg.empty() || src.rows < 500) {
return Mat();
}
bool findFlag = false;
/*第一阶梯找圆*/
assert(backgroundImg.type() == CV_8UC1);
Mat detectImg;
cv::resize(src, detectImg, cv::Size(src.cols / REAIZE, src.rows / REAIZE));
int bBaseX = detectImg.cols;
int bBaseY = detectImg.rows;
Mat upLight_Img = detectImg + 1.5 * detectImg;//20200423 修改 对图像进行叠加,增强目标亮度
blur(upLight_Img, upLight_Img, Size(3, 3));
EDCircles edcircles(upLight_Img);
vector<mCircle> EDCircle = edcircles.getCircles();
double maxR = 0;
int nIndex = -1;
for (int i = 0; i < EDCircle.size(); i++)
{
int startX = EDCircle[i].center.x - EDCircle[i].r;
int startY = EDCircle[i].center.y - EDCircle[i].r;
if (startX < 0 || startY <0)
continue;
if (EDCircle[i].center.x + EDCircle[i].r> bBaseX || EDCircle[i].center.y + EDCircle[i].r>bBaseY)
continue;
if (EDCircle[i].r > maxR)
{
maxR = EDCircle[i].r;
nIndex = i;
}
}
if (nIndex != -1)
{
int startX = EDCircle[nIndex].center.x * REAIZE - EDCircle[nIndex].r * REAIZE;
int startY = EDCircle[nIndex].center.y * REAIZE - EDCircle[nIndex].r* REAIZE;
double centerX = EDCircle[nIndex].center.x * REAIZE;
double centerY = EDCircle[nIndex].center.y * REAIZE;
double radius = EDCircle[nIndex].r;
if (radius < 50)//小于阈值 进行二次查找 radius一般大于100小于50像素的基本是其他小圆
{/*第二阶梯找圆 2020 - 06 - 19 添加 原图查找圆*/
blur(detectImg, detectImg, Size(3,3));
EDCircles edcircles2(detectImg);
vector<mCircle> EDCircle2 = edcircles2.getCircles();
double maxR = 0;
int mIndex = -1;
for (int i = 0; i < EDCircle2.size(); i++)
{
int startX = EDCircle2[i].center.x - EDCircle2[i].r;
int startY = EDCircle2[i].center.y - EDCircle2[i].r;
if (startX < 0 || startY < 0)
continue;
if (EDCircle2[i].center.x + EDCircle2[i].r > bBaseX || EDCircle2[i].center.y + EDCircle2[i].r > bBaseY)
continue;
if (EDCircle2[i].r > maxR)
{
maxR = EDCircle2[i].r;
mIndex = i;
}
}
if (mIndex == -1)
return Mat();
startX = EDCircle2[nIndex].center.x * REAIZE - EDCircle2[nIndex].r * REAIZE;
startY = EDCircle2[nIndex].center.y * REAIZE - EDCircle2[nIndex].r* REAIZE;
centerX = EDCircle2[nIndex].center.x * REAIZE;
centerY = EDCircle2[nIndex].center.y * REAIZE;
radius = EDCircle2[nIndex].r;
if (radius < 50)/*第三阶梯找圆*/
{
if (src.empty() || backgroundImg.empty() || src.rows < 500) {
return Mat();
}
assert(backgroundImg.type() == CV_8UC1);
Mat imgTmp, imgBinary;
const cv::Size cSize = cv::Size(ALG_RESIZE_IMAGE_WIDTH, floorf(ALG_RESIZE_IMAGE_WIDTH / (float)src.cols*(float)src.rows));
cv::resize(src, imgTmp, cSize);
Mat foregroundImg = getForeImage(imgTmp, backgroundImg);// 0421
using namespace luffy_base; //nThres = 90;
luffy_threshold::Threshold(foregroundImg, imgBinary, nThres);//0421
Mat dilatedImgBin;
closeOper(imgBinary, 7);
vector<vector<Point>> conts;
cv::findContours(imgBinary, conts, RETR_EXTERNAL, CHAIN_APPROX_NONE);
imgBinary.setTo(0);
//筛选最大轮廓的作为圆拟合区域
int maxsize = 0;
int nbestIndex = 0;
for (int i = 0; i < conts.size(); i++)
{
if (conts.at(i).size()>maxsize)
{
maxsize = conts.at(i).size();
nbestIndex = i;
}
}
if (conts.size() > 0)
{
drawContours(imgBinary, vector<vector<Point>>(1, conts.at(nbestIndex)), -1, Scalar::all(255), -1);
}
Mat hit; vector<Point> pts;
luffy_hit::firstHit4Circle(imgBinary, hit, pts, Point(cSize.width / 2, cSize.height / 2), 0, cSize.width / 2, 360, luffy_hit::emHitOut2In);
int nMinFitNum = 150;
if (pts.size() < nMinFitNum)//解决检测目标在图像边缘导致的抠图识别问题
{
if (conts.size()>0)
pts = conts.at(nbestIndex);
}
luffy_imageProc::RansacParam rs(0.01, 2, 150, nMinFitNum, 240);
vector<Point> pts2 = luffy_imageProc::fitModelbyRansac(pts, luffy_imageProc::emModelCircle, &rs);
float fRadius;
Point2f ptCenter;
bool bFind = luffy_imageProc::lsCircleFit(pts2, fRadius, ptCenter);
if (!bFind) {
return Mat();
}
Mat dst;
const int nOffset = 1;
fRadius += nOffset;
Rect rt(ptCenter.x - fRadius + nOffset, ptCenter.y - fRadius + nOffset, 2 * fRadius, 2 * fRadius);
rt &= Rect(0, 0, imgTmp.cols, imgTmp.rows);
imgTmp(rt).copyTo(dst);
static int nCount = cv::getTickCount();
if (pCircle) {
float fScale = src.cols / ALG_RESIZE_IMAGE_WIDTH;
Mat matBig = src - backgroundImg;
pCircle->fRadius = fRadius * fScale;
pCircle->ptCenter = Point(ptCenter.x * fScale, ptCenter.y * fScale);
Mat matBinary;
luffy_threshold::Threshold(matBig, matBinary, nThres);
Mat hit; vector<Point> pts;
luffy_hit::firstHit4Circle(matBinary, hit, pts, pCircle->ptCenter, 0, pCircle->fRadius + 10, 360, luffy_hit::emHitOut2In);//luffy_hit::emHitOut2In
luffy_imageProc::RansacParam rs(0.01, 2.5, 200, 150, 220);
vector<Point> pts2 = luffy_imageProc::fitModelbyRansac(pts, luffy_imageProc::emModelCircle, &rs);
float fRadius2;
Point2f ptCenter2;
bool bFind = luffy_imageProc::lsCircleFit(pts2, fRadius2, ptCenter2);
if (bFind) {
pCircle->fRadius = fRadius2;
pCircle->ptCenter = ptCenter2;
Rect rt(ptCenter2.x - fRadius2 + nOffset, ptCenter2.y - fRadius2 + nOffset, 2 * fRadius2, 2 * fRadius2);
if (rt.x < 0 || rt.y < 0 || rt.x + rt.width > matBinary.cols || rt.y + rt.height > matBinary.rows) {
return Mat();
}
rt &= Rect(0, 0, matBinary.cols, matBinary.rows);
src(rt).copyTo(dst);
int nWidth = ((int)((double)dst.cols / fScale / 4)) * 4;
cv::resize(dst, dst, cv::Size(nWidth, nWidth));
}
}
return dst;
}
}
int hight = 2 * radius * REAIZE;
if (startX > 0 && startY > 0 && hight > 0 \
&& startX < src.cols &&startY < src.rows \
&&hight < src.cols&&hight < src.rows \
&& startX+hight<src.cols && startY+hight<src.rows)
{
Mat cutMat = src(Rect(startX, startY, hight, hight));
if (cutMat.data != NULL)
{
if (hight < 50)
return Mat();
Mat dst;
double rate = src.cols*1.0 / ALG_RESIZE_IMAGE_WIDTH;
const cv::Size cSize = cv::Size(cutMat.cols*1.0 / rate, cutMat.rows*1.0 / rate);
cv::resize(cutMat, dst, cSize);
cv::Point2d center;
center.x = centerX;// EDCircle[nIndex].center.x * REAIZE;
center.y = centerY;// EDCircle[nIndex].center.y * REAIZE;
pCircle->ptCenter = center;
pCircle->fRadius = radius * REAIZE / rate;
return dst;
}
}
}
return Mat();
// /*以下为旧代码 目前不使用*/
// if (src.empty() || backgroundImg.empty() || src.rows < 500) {
// return Mat();
// }
//
// assert(backgroundImg.type() == CV_8UC1);
//
// Mat imgTmp, imgBinary;
// const cv::Size cSize = cv::Size(ALG_RESIZE_IMAGE_WIDTH, floorf(ALG_RESIZE_IMAGE_WIDTH / (float)src.cols*(float)src.rows));
// cv::resize(src, imgTmp, cSize);
//
// Mat foregroundImg = getForeImage(imgTmp, backgroundImg);// 0421
//
// using namespace luffy_base; //nThres = 90;
// luffy_threshold::Threshold(foregroundImg, imgBinary, nThres);//0421
//
// Mat dilatedImgBin;
// closeOper(imgBinary, 7);
// //dilate(imgBinary, dilatedImgBin, Mat::ones(7, 7, CV_32FC1));//
// //erode(dilatedImgBin, imgBinary, Mat::ones(7, 7, CV_32FC1));
// //openOper(imgBinary, Mat::ones(1, 13, CV_32FC1));//集智抠图问题修改 20190329
//
// vector<vector<Point>> conts;
// cv::findContours(imgBinary, conts, RETR_EXTERNAL, CHAIN_APPROX_NONE);
// imgBinary.setTo(0);
//
// /*
// for (int i = 0; i < conts.size(); i++) {
// const vector<Point> &pt = conts.at(i);
// if (pt.size() < 20) {
// continue;
// }
// Rect rt = boundingRect(pt);
// if (rt.width < 5 || rt.height < 5) {
// continue;
// }
// drawContours(imgBinary, conts, i, Scalar::all(255), -1);
// }
// */
//
////筛选最大轮廓的作为圆拟合区域
// int maxsize = 0;
// int nbestIndex = 0;
// for (int i = 0; i < conts.size(); i++)
// {
// if (conts.at(i).size()>maxsize)
// {
// maxsize = conts.at(i).size();
// nbestIndex = i;
// }
// }
// if (conts.size() > 0)
// {
// drawContours(imgBinary, vector<vector<Point>>(1,conts.at(nbestIndex)), -1, Scalar::all(255), -1);
// }
// //openOper(imgBinary, 17);//集智抠图问题修改 20190329
//
//
// Mat hit; vector<Point> pts;
// luffy_hit::firstHit4Circle(imgBinary, hit, pts, Point(cSize.width / 2, cSize.height / 2), 0, cSize.width/ 2, 360, luffy_hit::emHitOut2In);
//
// //luffy_imageProc::RansacParam rs(0.02, 2.5, 70, 100, 220);
// //luffy_imageProc::RansacParam rs(0.01, 2, 150, 150, 240);//20190117
//
// int nMinFitNum = 150;
//
// if (pts.size() < nMinFitNum)//解决检测目标在图像边缘导致的抠图识别问题
// {
// if (conts.size()>0)
// pts = conts.at(nbestIndex);
// }
//
// luffy_imageProc::RansacParam rs(0.01, 2, 150, nMinFitNum, 240);
// vector<Point> pts2 = luffy_imageProc::fitModelbyRansac(pts, luffy_imageProc::emModelCircle, &rs);
//#ifdef _DEBUG
// Mat imgColor;
// cv::cvtColor(imgTmp, imgColor, CV_GRAY2BGR);
// for (int i = 0; i < pts.size(); i++) {
// imgColor.at<cv::Vec3b>(pts.at(i))[0] = 255;//B
// imgColor.at< cv::Vec3b >(pts.at(i))[1] = 0;//G
// imgColor.at< cv::Vec3b >(pts.at(i))[2] = 0;//R
// }
// for (int i = 0; i < pts2.size(); i++) {
// imgColor.at<cv::Vec3b>(pts2.at(i))[0] = 0;//B
// imgColor.at< cv::Vec3b >(pts2.at(i))[1] = 0;//G
// imgColor.at< cv::Vec3b >(pts2.at(i))[2] = 255;//R
// }
//#endif
//
// float fRadius;
// Point2f ptCenter;
// bool bFind = luffy_imageProc::lsCircleFit(pts2, fRadius, ptCenter);
//
// if (!bFind) {
// return Mat();
// }
// Mat dst;
// const int nOffset = 1;
// fRadius += nOffset;
// Rect rt(ptCenter.x - fRadius + nOffset, ptCenter.y - fRadius + nOffset, 2 * fRadius, 2 * fRadius);
// rt &= Rect(0, 0, imgTmp.cols, imgTmp.rows);
// imgTmp(rt).copyTo(dst);
// static int nCount = cv::getTickCount();
// if (pCircle) {
// float fScale = src.cols / ALG_RESIZE_IMAGE_WIDTH;
// Mat matBig = src - backgroundImg;
// pCircle->fRadius = fRadius * fScale;
// pCircle->ptCenter = Point(ptCenter.x * fScale, ptCenter.y * fScale);
//
// Mat matBinary;
// luffy_threshold::Threshold(matBig, matBinary, nThres);
// Mat hit; vector<Point> pts;
// luffy_hit::firstHit4Circle(matBinary, hit, pts, pCircle->ptCenter, 0, pCircle->fRadius + 10, 360, luffy_hit::emHitOut2In);//luffy_hit::emHitOut2In
// luffy_imageProc::RansacParam rs(0.01, 2.5, 200, 150, 220);
// vector<Point> pts2 = luffy_imageProc::fitModelbyRansac(pts, luffy_imageProc::emModelCircle, &rs);
// float fRadius2;
// Point2f ptCenter2;
// bool bFind = luffy_imageProc::lsCircleFit(pts2, fRadius2, ptCenter2);
// if (bFind) {
// pCircle->fRadius = fRadius2;
// pCircle->ptCenter = ptCenter2;
// Rect rt(ptCenter2.x - fRadius2 + nOffset, ptCenter2.y - fRadius2 + nOffset, 2 * fRadius2, 2 * fRadius2);
//
// if (rt.x < 0 || rt.y < 0 || rt.x + rt.width > matBinary.cols || rt.y + rt.height > matBinary.rows ) {
// return Mat();
// }
// rt &= Rect(0, 0, matBinary.cols, matBinary.rows);
// src(rt).copyTo(dst);
// int nWidth = ((int)((double)dst.cols / fScale / 4)) * 4;
// cv::resize(dst, dst, cv::Size(nWidth, nWidth));
// }
// }
//
//return dst;
#endif
}
cv::Mat ImageProcess::getForeImage(const Mat & src, const Mat &backgroundImg)
{
Mat resizedBackgroundImg = backgroundImg;
if (backgroundImg.size() != src.size()) {
resize(backgroundImg, resizedBackgroundImg, src.size());
}
return (src - resizedBackgroundImg);
}