I am trying opencv with python now. What mean this error?
OpenCV Error: Assertion failed (m.dims >= 2) in Mat, file /build/opencv-ISmtkH/opencv-2.4.9.1+dfsg/modules/core/src/matrix.cpp, line 269
Traceback (most recent call last):
File "sabun5.py", line 16, in <module>
img_m = cv2.threshold(img_df, 50, 255, cv2.THRESH_BINARY)[1]
cv2.error: /build/opencv-ISmtkH/opencv-2.4.9.1+dfsg/modules/core/src/matrix.cpp:269: error: (-215) m.dims >= 2 in function Mat
You can see in the OpenCV documentation, that the threshold function just allow single-channel images.
If your image is a color one, it won't work. If it's grayscale but you are loading it with imread, it might be possible that OpenCV load it as a 3-channel one. You can add the flag to load it as a single-channel with CV_8UC1 (supposing it is an 8 bit unsigned one, which is the more common for a grayscale image). For example: img_df = cv2.imread("image/path", cv2.CV_8UC1)
you have to convert the image into grayscale before thresholding your image has more then two dimentions i.e (height,width,color-channel) gray scale image has only two dimention(height,width) it might help
import cv2
img = cv.imread('x.png',0)
# where 0 converts the image in grayscale or gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
img_m = cv2.threshold(img, 50, 255, cv2.THRESH_BINARY)[1]
cv2.waitKey(0)
img_dfis not loaded properly, maybe the path is not correct, so before callingcv2.threshold(), callprint img_df.shapeto check if the image is loaded properly.