Crop image after stitching

Question

After i stitched 2 images using OpenCV C++, i want to crop the image to remove the black area around the stitched image. I will lose a part of the image but it is ok. the image look like this:

How can i find the image corners and crop all the black area ??

If there any good references, please provides me with some of it.

Regards,

you could give my answer in http://stackoverflow.com/questions/21410449/how-do-i-crop-to-largest-interior-bounding-box-in-opencv/21479072#21479072 a try — Micka, Nov 04 '15 at 08:17
Thank you , the code in the link is very good, but may be needs some optimize. thanks a lot. — user2906086, Nov 04 '15 at 08:35
Unfortunately, in some cases the code didn't crop the image right. that make me lose a big part of the image. — user2906086, Nov 08 '15 at 06:21

score 4 · Answer 1 · answered Mar 15 '16 at 06:44

I've been using this piece of code from DJI dev guide (search for section "Cropping the Panorama"). https://dji-dev.gitbooks.io/mobile-sdk-tutorials/content/en/iOS/PanoDemo/PanoDemo_en.html#stitching-photos

The algorithm does not seem very robust at first glance, but so far it has proven to be good enough for my stitching use cases. However, I believe the code got a couple of bugs on these two lines

bool isBottomNotBlack=checkBlackRow(gray, roiRect.y+roiRect.height,roiRect);
bool isRightNotBlack=checkBlackColumn(gray, roiRect.x+roiRect.width,roiRect);

which should be changed to

bool isBottomNotBlack=checkBlackRow(gray, roiRect.y+roiRect.height-1,roiRect);
bool isRightNotBlack=checkBlackColumn(gray, roiRect.x+roiRect.width-1,roiRect);

Otherwise, you may get non-systematic C's bad excess error. Hope that helps!

score 0 · Answer 2 · answered Feb 02 '22 at 07:08

0

cropping is now integrated in the opencv_stitching_tool

answered Feb 02 '22 at 07:08

Lukas Weber

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Any chance have a better link/direct part about cropping – Jacob David C. Cunningham Dec 23 '22 at 23:13

Crop image after stitching

2 Answers2