how can i scale an image properly?

stillNovice
80 ●1 ●3 ●14

I have a 640 x 480 camera feed that i am trying to stretch up to 1280 x 960.

I want double the pixels, so that a 4 x 4 blob of colour becomes 8 x 8, etc.

Using this code:

        cv::Size sizeUp(1280, 1024);
        cv::Mat newSize(cv::Size(sizeUp), CV_8UC1);
        cv::resize(SmallImage,newSize, sizeUp);

just puts the small image in the top left corner of the new Mat, and leaves the rest blank.

Am I going about this the wrong way?

Comments

could you provide some example of the it with images?

theodore (May 20 '15)edit

try this:

cv::Mat newSize;
cv::resize(SmallImage,newSize,cv::Size(SmallImage.cols*2,SmallImage.rows*2));

sturkmen (May 20 '15)edit