Error in "Lucas-Kanade Optical Flow in OpenCV" documentation (Bug #3646)

Added by Mick Chanthaseth almost 11 years ago. Updated almost 10 years ago.

Status:Cancelled Start date:2014-04-13
Priority:Low Due date:
Assignee:Andrey Pavlenko % Done:

0%
Category:documentation
Target version:3.0
Affected version:branch 'master' (3.0-dev) Operating System:Windows
Difficulty:Easy HW Platform:x64
Pull request:

Description

these lines

mask = cv2.line(mask, (a,b),(c,d), color[i].tolist(), 2)
        frame = cv2.circle(frame,(a,b),5,color[i].tolist(),-1)

should be

cv2.line(mask, (a,b),(c,d), color[i].tolist(), 2)
        cv2.circle(frame,(a,b),5,color[i].tolist(),-1)

History

#1
Updated by Yash Vadalia almost 11 years ago

As far as I know this is not a bug. It is supposed to be this way as per the OpenCV 3.x python api. The drawing functions return the input image after they are done drawing.

#2
Updated by Andrew Senin almost 11 years ago

Andrey, could you please confirm the line is correct?

  • Status changed from New to Open
  • Affected version changed from 2.4.8 (latest release) to branch 'master' (3.0-dev)
  • Assignee set to Andrey Pavlenko
  • Priority changed from Normal to Low
  • Category set to python bindings
  • Target version set to 3.0

#3
Updated by abid rahman almost 11 years ago

Those lines are correct as per docs of cv2.line and cv2.circle. It is OpenCV 3.x API.

http://docs.opencv.org/trunk/modules/core/doc/drawing_functions.html#cv2.circle
cv2.circle(img, center, radius, color[, thickness[, lineType[, shift]]]) → img

http://docs.opencv.org/trunk/modules/core/doc/drawing_functions.html#cv2.line
cv2.line(img, pt1, pt2, color[, thickness[, lineType[, shift]]]) → img

#4
Updated by Maksim Shabunin almost 10 years ago

According to previous statements, this is not a bug.

  • Status changed from Open to Cancelled
  • Category changed from python bindings to documentation

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