CODEWITHSUNDEEP
c++opencv
A S
A S

Reputation: 2974

Pad array with zeros- openCV

How to pad an array(cv::Mat) with zeros in OpenCV?

Upvotes: 11

Views: 22280

Answers (2)

Sam
Sam

Reputation: 20058

Here is a way to do it

cv::Mat img(100, 100, CV_8UC3);
cv::Mat padded;
int padding = 3;
padded.create(img.rows + 2*padding, img.cols + 2*padding, img.type());
padded.setTo(cv::Scalar::all(0));

img.copyTo(padded(Rect(padding, padding, img.cols, img.rows)));

Upvotes: 18

qun
qun

Reputation: 720

An another way to pad an image is to use copyMakeBorder function:

 C++: void copyMakeBorder(InputArray src, OutputArray dst, int top, int bottom, int left, int right, int borderType, const Scalar& value=Scalar() )

Then padding with zeros is simply like that

Mat image,image_pad;
copyMakeBorder(image,image_pad,1,1,1,1,BORDER_CONSTANT,Scalar(0));

Finally, here is the tutorial of Adding borders to your images.

Upvotes: 29

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