OpenCV Error: Unsupported format while using findContours() method

Question

I am trying to preprocess my image so that in the end i could find the contours from the preprocessed image.

img = cv2.imread('image.jpg',0)
img = cv2.copyMakeBorder(img, 50, 50, 50, 50, cv2.BORDER_CONSTANT)   
sobely = cv2.Sobel(img,cv2.CV_64F,0,1,ksize=5)
_,contours, hierarchy = cv2.findContours(sobely,cv2.RETR_TREE,cv2.CHAIN_APPROX_SIMPLE)

It is giving me an error stating : OpenCV Error: Unsupported format or combination of formats ([Start]FindContours supports only CV_8UC1 images when mode != CV_RETR_FLOODFILL otherwise supports CV_32SC1 images only) in cvStartFindContours

I am usng opencv3.0

Anubhav Rohatgi · Accepted Answer · 2016-02-18 05:32:04Z

2

Pretty straight forward. Your image should be of ideally binary and CV_8UC1. You will have to convert the image to CV_8UC1 format to enable contours to be processed. Contours does not support CV_64F double type.

answered Feb 18, 2016 at 5:32

Anubhav Rohatgi

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