How to select a contour on mouse click
Please explain the way for selecting a contour on mouse click
Please explain the way for selecting a contour on mouse click
add a mouse callback to your window.
cv2.setMouseCallback('image',mousecallback)
in the callback function, run a point in polygon (cv.pointPolygonTest) test for each contour
def mousecallback(event,x,y,flags,param):
if event == cv2.EVENT_LBUTTONCLK:
for i in range(0,contours.size)
r=cv.pointPolygonTest(contour[i],Point(y,x),False)
if r>0:
print("Selected contour "+i)
I hope you get the idea. Note that the code is untested.
P.S. you might also use the path.contains_points()
from the Matplotlib library. Check the mouse handling tutorial in opencv too!
ERROR: Traceback (most recent call last): File "changingcolorspaces.py", line 31, in mousecallback for i in range(0,contours.size): AttributeError: 'list' object has no attribute 'size'
As I said, the code is untested! It's to explain the solution, not to solve your problem.
I think it's obvious that the loop iterates through the contours, going from 0 to the number of contours. And if the list doesn't have a size
function, you could have guessed that it's the len(contours)
function (sometimes I mistake the C++ and Python syntax).
Asked: 2018-05-20 23:25:08 -0600
Seen: 2,376 times
Last updated: May 21 '18
Area of a single pixel object in OpenCV
Weird result while finding angle
cv2.perspectiveTransform() with Python
cv2 bindings incompatible with numpy.dstack function?
Getting single frames from video with python
Line detection and timestamps, video, Python
Different behaviour of OpenCV Python arguments in 32 and 64-bit systems