OpenCV 关于两张图片的整合问题

第一，将两张图片上下排列，合成一张图片

 extern IplImage* stack_imgs( IplImage* img1, IplImage* img2 )
 {
     IplImage* stacked = cvCreateImage( cvSize( MAX(img1->width, img2->width),
                                         img1->height + img2->height ),
                                         IPL_DEPTH_8U, 3 );

     cvZero( stacked );
     cvSetImageROI( stacked, cvRect( 0, 0, img1->width, img1->height ) );
     cvAdd( img1, stacked, stacked, NULL );
     cvSetImageROI( stacked, cvRect(0, img1->height, img2->width, img2->height) );
     cvAdd( img2, stacked, stacked, NULL );
     cvResetImageROI( stacked );

     return stacked;
 }

第二，将两张图片左右排列，合成一张图片

 extern IplImage* expand_imgs( IplImage* img1, IplImage* img2 )
 {
     IplImage* expanded = cvCreateImage( cvSize(
         img1->width + img2->width,MAX(img1->height, img2->height)),
         IPL_DEPTH_8U, 3 );

     cvZero( expanded );
     cvSetImageROI( expanded, cvRect( 0, 0, img1->width, img1->height ) );
     cvAdd( img1, expanded, expanded, NULL );
     cvSetImageROI( expanded, cvRect(img1->width, 0, img2->width, img2->height) );
     cvAdd( img2, expanded, expanded, NULL );
     cvResetImageROI( expanded );

     return expanded;
 }