Creating new image in a loop using OpenCV

Question

I am programing some image conversion code with OpenCV and I don't know how can I create image memory buffer to load image on every iteration. I have number of iteration (maxImNumber) and I have an input image. In every loop program must create image that is resized and modified input image. Here is some basic code (concept).

    for (int imageIndex = 0; imageIndex < maxImNumber; imageIndex++){
    cvCopy(inputImage, images[imageIndex], 0);
    cvReleaseImage(&inputImage);

    images[imageIndex+1] = cvCreateImage(cvSize((image[imageIndex]->width)/2, image[imageIndex]->height), IPL_DEPTH_8U, 1);

    for (i=1; i < image[imageIndex]->height; i++) {   
        index = 0;      //   
        for(j=0; j < image[imageIndex]->width ; j=j+2){
            // doing some basic matematical operation on image content and store it to new image
            images[imageIndex+1][i][index] = (image[imageIndex][i][j] + image[imageIndex][i][j+2])/2;
            index++
        }
    }

    inputImage = cvCreateImage(cvSize((image[imageIndex+1]->width), image[imageIndex]->height), IPL_DEPTH_8U, 1);
    cvCopy(images[imageIndex+1], inputImage, 0);
}

Can somebody, please, explain how can I create this image buffer (images[]) and allocate memory for it. Also how can I access any image in this buffer?

Thank you very much in advance!

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ypnos
– ypnos

2011-01-07 15:52:15 +00:00
Commented Jan 7, 2011 at 15:52 — ypnos
– ypnos, Commented Jan 7, 2011 at 15:52

jeff7 · Accepted Answer · 2011-01-07 12:21:15Z

2

images is just an array of IplImage pointers so the following should work:

IplImage** images = (IplImage**) malloc(sizeof(IplImage*)*maxImNumber)

answered Jan 7, 2011 at 12:21

jeff7

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rossb83 · Accepted Answer · 2011-01-07 15:47:54Z

1

or better yet vector images ... and then images.pushback(newImage) on each loop

answered Jan 7, 2011 at 15:47

rossb83

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Comments

Adi Shavit · Accepted Answer · 2011-01-09 08:32:57Z

0

Use an std::vector<IplImage*> images(maxImNumber).
Iterate over it once to allocate all images using, e.g. cvCreateImage() or cvCloneimage().
When you are done with it iterator over it again and cvReleaseImage() all the images.

answered Jan 9, 2011 at 8:32

Adi Shavit

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