How to resize an image to a specific size in OpenCV

Question

IplImage  img   cvLoadImage  something jpg    IplImage  src   cvLoadImage  src jpg    cvSub src  img  img     But the size of the source image is different from img   Is there any opencv function to resize it to the img size

User · Accepted Answer

You can use cvResize  Or better use c   interface  eg cv  Mat instead of IplImage and cv  imread instead of cvLoadImage  and then use cv  resize which handles memory allocation and deallocation itself

User · Answer

The two functions you need are documented here    imread  read an image from disk   Image resizing  resize to just any size    In short      Load images in the C   format cv  Mat img   cv  imread  something jpg    cv  Mat src   cv  imread  src jpg        Resize src so that is has the same size as img cv  resize src  src  img size       And please  please  stop using the old and completely deprecated IplImage  classes

User · Answer

You can use CvInvoke Resize for Emgu CV 3 0  e g   CvInvoke Resize inputImage  outputImage  new System Drawing Size 100  100   0  0  Inter Cubic     Details are here

User · Answer

Make a useful function like this   IplImage  img resize IplImage  src img  int new width int new height        IplImage  des img      des img cvCreateImage cvSize new width new height  src img- gt depth src img- gt nChannels       cvResize src img des img CV INTER LINEAR       return des img

User · Answer

For your information  the python equivalent is   imageBuffer   cv LoadImage  strSrc   nW   new X size nH   new Y size smallerImage   cv CreateImage   nH  nW   imageBuffer depth  imageBuffer nChannels   cv Resize  imageBuffer  smallerImage   interpolation cv CV INTER CUBIC   cv SaveImage  strDst  smallerImage

[c++] How to resize an image to a specific size in OpenCV?

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