LBP opencv c ++问题 [英] LBP opencv c++ problem
本文介绍了LBP opencv c ++问题的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我想为图像计算LBP。
i使用此代码：
cv :: Mat LBP（string src_image ）
{
cv :: Mat temp_image = imread（src_image.c_str（）， 1 ）;
cv :: Mat Image（temp_image.rows，temp_image.cols，CV_8UC1）;
cv :: Mat lbp（temp_image.rows，temp_image.cols，CV_8UC1）;
if （temp_image.channels（）== 3 ）
cvtColor（temp_image，Image，CV_BGR2GRAY）;
imshow（ src_image，Image）;
int center = 0 ;
int center_lbp = 0 ;
for （ int row = 1 ; row< Image.rows; row ++）
{
for （ int col = 1 ; col< Image.cols; col ++）
{
center = Image.at< int> （row，col）;
center_lbp = 0 ;
if （center< = Image.at< int>（row - 1 ，col - 1 ））
center_lbp + = 1 ;
if （center< = Image.at< int>（row - 1 ，col））
center_lbp + = 2 ;
if （center< = Image.at< int>（row - 1 ，col + 1 ））
center_lbp + = 4 ;
if （center< = Image.at< int>（row，col - 1） ））
center_lbp + = 8 ;
if （center< = Image.at< int>（row，col + 1） ））
center_lbp + = 16 ;
if （center< = Image.at< int>（row + 1 ，col - 1 ））
center_lbp + = 32 ;
if （center< = Image.at< int>（row + 1 ，col））
center_lbp + = 64 ;
if （center< = Image.at< int>（row + 1 ，col + 1 ））
center_lbp + = 128 ;
cout<< center lbp value：<< center_lbp<< ENDL;
lbp.at< int>（row，col）= center_lbp;
}
}
imshow（ lbp_image，lbp）;
waitKey（ 0 ）;
destroyAllWindows（）;
return lbp;
}
但它在此指令中抛出无法读取内存的异常
center = Image.at< int>（row，col）;
这是我调试程序时本地人的图像
https://dl.dropboxusercontent.com/u/89320576/Capture.PNG [ ^ ]
问题是什么？
解决方案
在某些表达式中，您尝试访问坐标为行+ 1和col +的像素1。这超出了允许的范围，因为你的行和列变量分别运行到Image.rows - 1 Image.cols - 1. + 1只能让自己超越边缘。
要修复它，只需将循环减少到
（ int row = 1 ; row< Image.rows- 1 ;行++）
{
for （ int col = 1 ; col< Image.cols- 1 ; col ++）
Mat LBP（Mat src_image）
{
bool affiche = true;
cv :: Mat Image（src_image.rows，src_image.cols，CV_8UC1）;
cv :: Mat lbp（src_image.rows，src_image.cols，CV_8UC1）;
if（src_image.channels（）== 3）
cvtColor（src_image，Image，CV_BGR2GRAY）;
unsigned center = 0;
unsigned center_lbp = 0;
for（int row = 1; row < Image.rows-1; row ++）
{
for （int col = 1; col < < span class =code-attribute> Image.cols-1; col ++）
< span class =code-attribute> {
< span class =code-attribute> center = Image.at< uchar > （row，col）;
center_lbp = 0;
if（center < = Image.at< uchar > （row - 1，col - 1））
center_lbp + = 1;
if（center < = Image.at< uchar > （row - 1，col））
center_lbp + = 2;
if（center < = Image.at< uchar > （row-1，col + 1））
center_lbp + = 4;
if（center < = Image.at< uchar > （row，col - 1））
center_lbp + = 8;
if（center < = Image.at< uchar > （row，col + 1））
center_lbp + = 16;
if（center < = Image.at< uchar > （row + 1，col - 1））
center_lbp + = 32;
if（center < = Image.at< uchar > （row + 1，col））
center_lbp + = 64;
if（center < = Image.at< uchar > （row + 1，col + 1））
center_lbp + = 128;
lbp.at < uchar > （row，col）= center_lbp;
}
}
if（affiche == true）
{
cv :: imshow（image LBP，lbp）;
waitKey（10）;
cv :: imshow（灰度，图片）;
waitKey（10）;
}
else
{
cv :: destroyWindow（image LBP）;
cv :: destroyWindow（灰度）;
}
返回lbp;
}
int main（）
{
Mat frame1;
frame1 = imread（path image）
LBP（frame1）;
返回0;
}
Hi, i want to calculate LBP for an image.
i use this code:
cv::Mat LBP(string src_image)
{
cv::Mat temp_image = imread(src_image.c_str(), 1);
cv::Mat Image(temp_image.rows, temp_image.cols, CV_8UC1);
cv::Mat lbp(temp_image.rows, temp_image.cols, CV_8UC1);
if (temp_image.channels() == 3)
cvtColor(temp_image, Image, CV_BGR2GRAY);
imshow("src_image", Image);
int center = 0;
int center_lbp = 0;
for (int row = 1; row < Image.rows; row++)
{
for (int col = 1; col < Image.cols; col++)
{
center = Image.at<int>(row, col);
center_lbp = 0;
if (center <= Image.at<int>(row - 1, col - 1))
center_lbp += 1;
if (center <= Image.at<int>(row - 1, col))
center_lbp += 2;
if (center <= Image.at<int>(row - 1, col + 1))
center_lbp += 4;
if (center <= Image.at<int>(row, col - 1))
center_lbp += 8;
if (center <= Image.at<int>(row, col + 1))
center_lbp += 16;
if (center <= Image.at<int>(row + 1, col - 1))
center_lbp += 32;
if (center <= Image.at<int>(row + 1, col))
center_lbp += 64;
if (center <= Image.at<int>(row + 1, col + 1))
center_lbp += 128;
cout << "center lbp value: " << center_lbp << endl;
lbp.at<int>(row, col) = center_lbp;
}
}
imshow("lbp_image", lbp);
waitKey(0);
destroyAllWindows();
return lbp;
}
but it throw an exception "unable to read memory" at this instruction
center = Image.at<int>(row, col);
and this is image for locals when i debug the program
https://dl.dropboxusercontent.com/u/89320576/Capture.PNG[^]
what is the problem??
解决方案
In some of your expressions you try to access pixels with coordinates row+1 and col+1. That is outside the permitted range, as your row and col variables run to Image.rows - 1 respectively Image.cols - 1. The +1 just gets yourself one over the edge.
To fix it, just reduce the loops to
for (int row = 1; row < Image.rows-1; row++) { for (int col = 1; col < Image.cols-1; col++)
Mat LBP(Mat src_image)
{
bool affiche=true;
cv::Mat Image(src_image.rows, src_image.cols, CV_8UC1);
cv::Mat lbp(src_image.rows, src_image.cols, CV_8UC1);
if (src_image.channels() == 3)
cvtColor(src_image, Image, CV_BGR2GRAY);
unsigned center = 0;
unsigned center_lbp = 0;
for (int row = 1; row < Image.rows-1; row++)
{
for (int col = 1; col < Image.cols-1; col++)
{
center = Image.at<uchar>(row, col);
center_lbp = 0;
if (center <= Image.at<uchar>(row - 1, col - 1))
center_lbp += 1;
if (center <= Image.at<uchar>(row - 1, col))
center_lbp += 2;
if (center <= Image.at<uchar>(row - 1, col + 1))
center_lbp += 4;
if (center <= Image.at<uchar>(row, col - 1))
center_lbp += 8;
if (center <= Image.at<uchar>(row, col + 1))
center_lbp += 16;
if (center <= Image.at<uchar>(row + 1, col - 1))
center_lbp += 32;
if (center <= Image.at<uchar>(row + 1, col))
center_lbp += 64;
if (center <= Image.at<uchar>(row + 1, col + 1))
center_lbp += 128;
lbp.at<uchar>(row, col) = center_lbp;
}
}
if(affiche == true)
{
cv::imshow("image LBP", lbp);
waitKey(10);
cv::imshow("grayscale",Image);
waitKey(10);
}
else
{
cv::destroyWindow("image LBP");
cv::destroyWindow("grayscale");
}
return lbp;
}
int main()
{
Mat frame1;
frame1= imread("path image")
LBP(frame1);
return 0;
}这篇关于LBP opencv c ++问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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