问题描述
从cvMat写入图像时遇到问题.
I am facing a problem while writing image from cvMat.
这就是我所做的.
IplImage* low_threshold_mask = cvCreateImage(cvSize(width, height), IPL_DEPTH_8U, 1);
CvMat* labelMat = cvCreateMat(low_threshold_mask->height,low_threshold_mask->width,CV_32F);
/*我在函数内填充了labelMat的元素.它是这样完成的:cvmSet(labelMat，r，c，label); //标签的类型为 long */
/* I populate elements of labelMat inside a function. Its done like this: cvmSet(labelMat,r,c,label); // where label is of type long */
要检查这些值，我将每个像素值转储到文本文件中，然后转储图像.
To check the values I dump each pixel value in a text file and also dump the image.
IplImage* labelImg;
IplImage imageHeader;
labelImg = cvGetImage(labelMat, &imageHeader);
现在，当我对转储的文本文件中的像素强度和相应值进行交叉检查时，我发现不匹配.我觉得我在文本文件中有正确的值，但在图像中有错误的值.
Now when I cross-check pixel intensity with corresponding value in dumped text file, I find mis-match. I feel I have got correct values in text file but wrong ones in image.
任何人都可以帮助找出错误吗?
Can anyone help in figuring out the mistake?
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我仍然面临问题.我已经上传了程序.我将解释我到底在哪里遇到错误.
I am still facing the problem. I have uploaded my programs. I will explain where exactly I am facing the error.
库:与openCV一起使用的是Boost库的不相交集.
Libraries used: Along with openCV, I am using disjoint_sets of boost library.
基本上，我正在做连接的组件标签.出于调试目的，对于第20帧，我将每个像素的标签信息都转储到a)文本文件中，并且b)强度级别与像素的最终标签相同的图像.因此，我期望文本和图像中的值相同.但这没有发生.我不知道为什么.文本文件显示正确的值，但不显示图像.我正在检查Matlab中图像的像素值(我已经在matlab中处理过从1开始而不是0的索引).
Basically I am doing connected component labeling.For debugging purpose, for 20th frame, I have dumped the label info of each pixel both in a)text file as well b) an image with intensity levels same as the final label of the pixels. So i am expecting the values same in both text and image. But that's not happening. And I am unable to figure out why. The text files shows the correct values but not the image. I am checking pixel values of image in Matlab(i had taken care of indices in matlab starts with 1 not 0).
我的文本文件a)(frame20final.txt)被填充到GrimsonGMM.cpp/ConCompLabeling()中.b)(frame20image.txt)被填充到main.cpp中我转储的图像(frame-ccs.jpg)已填充到main.cpp中.
My text filesa) (frame20final.txt) gets populated in GrimsonGMM.cpp/ConCompLabeling().b) (frame20image.txt) gets populated in main.cppMy dumped image(frame-ccs.jpg) gets populated in main.cpp.
两个文本文件都获得相同的值. 因此，从CvMat编写图像时一定会有一些错误.
Both the text files get same values. So there must be some mistake in writing the image from CvMat.
测试视频: person15_walking_d1_uncomp.avi 您也可以尝试其他任何视频.
Test Video: person15_walking_d1_uncomp.aviYou can try with any other video also.
预先感谢，考施克
推荐答案
我理解为什么会收到错误消息.我正在转储正在压缩的 .jpg 图片.当我使用.png
I understood why I was getting the error. I was dumping in .jpg image which was doing compression. This was resolved when I used .png
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