Replace subsection of Mat with another Mat.

asked 2019-06-06 12:16:25 -0600

GoldenBug
26 ●2

I have an image stored in a Mat object (BigImage). I also have a smaller Mat image that fits inside the bounds of first mat object (SmallImage).

Currently I'm replacing a section of BigImage with SmallImage. I'm doing this by iterating and doing a pixel by pixel assignment from SmallImage to BigImage.

Is there a faster way of doing thing?

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answered 2019-06-06 16:29:55 -0600

Witek

1156 ●1 ●9 ●19

SmallImage.copyTo(BigImage(Rect(x, y, SmallImage.cols, SmallImage.rows)));

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Is this any more performant, or just more succinct?

GoldenBug ( 2019-06-06 16:38:35 -0600 )edit

Both. This uses some known guarantees about the Mat memory structure to be much faster than a pixel-by-pixel method.

Tetragramm ( 2019-06-06 19:05:42 -0600 )edit

Interesting, Thank you!

GoldenBug ( 2019-06-06 19:08:14 -0600 )edit

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Asked: 2019-06-06 12:16:10 -0600

Seen: 1,859 times

Last updated: Jun 06 '19

Replace subsection of Mat with another Mat. edit