CODEWITHSUNDEEP
pythonopencv
Jonathan
Jonathan

Reputation: 1936

OpenCV drawMatches function error (wrong source type)

When I try to do the following:

cv2.drawMatches(img1, keypoints1, img2, keypoints2, matches, None, matchColor=(0,255,0), singlePointColor=(0, 0, 255))

I get this error:

error: OpenCV(4.1.0) ../modules/features2d/src/draw.cpp:127: error: (-2:Unspecified error) in function 'void cv::_prepareImage(cv::InputArray, const cv::Mat&)' Unsupported source image: 'src.type() == CV_8UC1 || src.type() == CV_8UC3 || src.type() == CV_8UC4' where 'src.type()' is 21 (CV_32FC3)

This error wasn't occurring yesterday and I didn't update the environment or the images. How can I fix this error? Not sure how to properly convert it.

I can see that the error occurs from here, but not sure what source type is expected.

Upvotes: 3

Views: 2059

Answers (2)

Jonathan
Jonathan

Reputation: 1936

I simply had to convert the image types as follows:

cv2.drawMatches(np.uint8(img1), keypoints1, np.uint8(img2), 
    keypoints2, matches, None, matchColor=(0,255,0), singlePointColor=(0, 0, 255))

Upvotes: 2

Francisco Melo junior
Francisco Melo junior

Reputation: 338

The function _prepareImage seems to accept CV_8UC1 this types is 8U: Unsigned int 8-bit, C1: 1 channels. However, it seems you're sending a 32F, so 32 bit, with 3 channels. 

 where 'src.type()' is 21 (CV_32FC3)

Verify the type of the image you have and assign it accordingly.

Upvotes: 2

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