在arm中做图像处理,因为不支持GTK,一般都会用到QT来实现显示功能,所以不可避免的要涉及到QImage和IplImage两种图像格式之间的转换,下面总结一下转换的方法。
(下面格式转换的代码都是网友写的,我这里只是归纳修改了一下)
IplImage 转换为 QImage
方法1
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- QImage *IplImageToQImage(const IplImage *img)
- {
- QImage *qmg;
- cvCvtColor(img,img,CV_BGR2RGB);
- qmg = new QImage((unsigned char*)img->imageData,img->width,img->height,img->widthStep,QImage::Format_RGB888);
- return qmg;
- }
这里要注意的是,IplImage每个像素点存储的格式为BGR,而QImage每个像素点存储的格式为RGB,所以在转换之前需要先使用opencv提供的cvCvtColor函数将BGR图像变为RGB图像。还有就是QImage最后一个参数QImage::Format_RGB888,这是指色彩空间R,G,B三个通道分别用8位来表示,如果是灰度图,则参数为QImage::Format_Indexed8。
例如:
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- QImage *IplImageToQImage(const IplImage *img)
- {
- QImage *qmg;
- IplImage *img_gray = cvCreateImage(cvGetSize(img),8,1);
- cvCvtColor(img,img_gray,CV_BGR2GRAY);
- qmg = new QImage((unsigned char*)img->imageData,img->width,img->height,img->widthStep,QImage::Format_Indexed8);
- return qmg;
- }
方法2
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- QImage *IplImageToQImage(*img)
- {
- QImage *qmg = new QImage (img->width,img-height,img->widthStep,QImage::Format_RGB32);
- for (int i=0; i<height; ++i)
- {
- for (int j=0; j<width; ++j)
- {
- int r,g,b;
- if( 3 == img->nChannels )
- {
- b = (int)CV_IMAGE_ELEM( img, uchar, i, j*3+0 );
- g = (int)CV_IMAGE_ELEM( img, uchar, i, j*3+1 );
- r = (int)CV_IMAGE_ELEM( img, uchar, i, j*3+2 );
- }
- else if( 1 == img->nChannels )
- {
- b = (int)CV_IMAGE_ELEM( img, uchar, i, j*3+0 );
- g = b;
- r = b;
- }
- qmg->setPixel( j, i, qRgb(r,g,b) );
- }
- }
- return qmg;
- }
这里要注意的是qmg->setPixel( j, i, qRgb(r,g,b) );括号里面是(j,i);而不是(i,j)。我还没弄明白为什么这里要调换一下i,j的顺序,希望知道的朋友指点一下。
QImage转换为IplImage
方法1
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- IplImage *QImageToIplImage(const QImage * qImage)
- {
- int width = qImage->width();
- int height = qImage->height();
- CvSize Size;
- Size.height = height;
- Size.width = width;
- IplImage *IplImageBuffer = cvCreateImage(Size, IPL_DEPTH_8U, 3);
- for (int y = 0; y < height; ++y)
- {
- for (int x = 0; x < width; ++x)
- {
- QRgb rgb = qImage->pixel(x, y);
- cvSet2D(IplImageBuffer, y, x, CV_RGB(qRed(rgb), qGreen(rgb), qBlue(rgb)));
- }
- }
- return IplImageBuffer;
- }
方法2
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- IplImage *QImageToIplImage(const QImage * qImage)
- {
- int width = qImage->width();
- int height = qImage->height();
- CvSize Size;
- Size.height = height;
- Size.width = width;
- IplImage *IplImageBuffer = cvCreateImage(Size, IPL_DEPTH_8U, 3);
- for (int y = 0; y < height; ++y)
- {
- for (int x = 0; x < width; ++x)
- {
- QRgb rgb = qImage->pixel(x, y);
- CV_IMAGE_ELEM( IplImageBuffer, uchar, y, x*3+0 ) = qBlue(rgb);
- CV_IMAGE_ELEM( IplImageBuffer, uchar, y, x*3+1 ) = qGreen(rgb);
- CV_IMAGE_ELEM( IplImageBuffer, uchar, y, x*3+2 ) = qRed(rgb);
- }
- }
- return IplImageBuffer;
- }
这两种方法其实都是一样的,只是表达形式有点不同,还有就是一个是生成RGB格式图像,一个是生成BGR格式的图像。
原文地址:https://www.cnblogs.com/yzl050819/p/8410581.html
时间: 2024-10-11 15:34:44