This forum is disabled, please visit https://forum.opencv.org
| 2020-05-01 16:53:29 -0600 | received badge | ● Popular Question (source) |
| 2017-09-18 08:42:15 -0600 | commented answer | Detect page corners in a photo Nvm, I changed the contour thickness to 3 while drawing and I get a continuous contour. I will try Hough Line on the out |
| 2017-09-18 06:19:38 -0600 | commented answer | Detect page corners in a photo Exactly. But when I supply this to Canny, it gives a noisy and a non-continuous edges, unlike the Canny image provided b |
| 2017-09-18 02:05:48 -0600 | commented answer | Detect page corners in a photo @VxW did you have a look at it? |
| 2017-09-15 06:22:37 -0600 | commented answer | Detect page corners in a photo Updated a link to it |
| 2017-09-15 06:22:17 -0600 | edited question | Detect page corners in a photo Detect page corners in a photo I have tried 2 methodologies as follows:- conversion of image to Mat apply gaussian blu |
| 2017-09-15 05:43:44 -0600 | commented question | Detect page corners in a photo @LBerger I tried a lot but they just won't upload. So I had to upload elsewhere and post their links |
| 2017-09-15 00:16:05 -0600 | marked best answer | Detect page corners in a photo I have tried 2 methodologies as follows:-
the problem with this method is: 1. too many contours are detected 2. mostly open contours 3. doesn't detect what I want to detect Then I changed my approach and tried adaptive thresholding after gaussian blur it is much better and I am able to detect the corners in 50% cases The current problem I am facing is that the page detection requires contrasting and plain background without any reflections. I think it's too idealistic for real world use. This is where I would like some help. Even a direction towards the solution is highly appreciated especially in java. Thanks in anticipation Update: median blur did not help much so I traced the cause and found that the page boundary was detected in bits and pieces and not a single contour so it detected the biggest contour as a part of the page boundary Therefore performed some morphological operations to close relatively small gaps and the resultant largest contour is definitely improved but its its not optimum. Any ideas how I can improve the big gaps? Update 2: https://ibb.co/gB8Zm5 <--new Image https://ibb.co/imvfR5 <-- canny result after matching the results of median and adaptive from your answer Update 3:https://ibb.co/is6WzQ <-- Image before canny edge |
| 2017-09-15 00:16:05 -0600 | received badge | ● Scholar (source) |
| 2017-09-15 00:15:09 -0600 | answered a question | Extracting A4 sheet out of troubling backgrounds I would suggest you follow this tutorial to make a scanner in Python with ease http://www.pyimagesearch.com/2014/09/01/ |
| 2017-09-15 00:10:06 -0600 | commented answer | Detect page corners in a photo agreed! it's almost impossible to work with the 3rd Image. I don't get your homework reference. Anyways, I'm just one st |
| 2017-09-14 03:57:44 -0600 | edited question | Detect page corners in a photo Detect page corners in a photo I have tried 2 methodologies as follows:- conversion of image to Mat apply gaussian blu |
| 2017-09-14 03:54:35 -0600 | commented answer | Detect page corners in a photo Beautiful. Those images helped a ton!! I have found my error. When I use canny using the same setting as yours, my conto |
| 2017-09-13 11:40:01 -0600 | commented answer | Detect page corners in a photo How do I ensure that I indeed have the correct binarized image with correct edges? Can you post your image before and af |
| 2017-09-13 09:06:59 -0600 | commented answer | Detect page corners in a photo I am aware of that. I also know that the lines are arranged in decreasing order according to the number of votes. But ev |
| 2017-09-13 08:21:01 -0600 | commented answer | Detect page corners in a photo Well I tried HoughLines but I am not getting the same result as your result images. I am implementing this in java and a |
| 2017-09-13 01:19:19 -0600 | edited question | Detect page corners in a photo Detect page corners in a photo I have tried 2 methodologies as follows:- conversion of image to Mat apply gaussian blu |
| 2017-09-13 01:19:00 -0600 | edited question | Detect page corners in a photo Detect page corners in a photo I have tried 2 methodologies as follows:- conversion of image to Mat apply gaussian blu |
| 2017-09-13 00:16:22 -0600 | received badge | ● Editor (source) |
| 2017-09-13 00:16:22 -0600 | edited question | Detect page corners in a photo Detect page corners in a photo I have tried 2 methodologies as follows:- conversion of image to Mat apply gaussian blu |
| 2017-09-12 23:57:16 -0600 | commented question | Detect page corners in a photo Can you shed some light on how can I do "edge detection method based on image pyramid which enhances strong long edges b |
| 2017-09-12 08:25:13 -0600 | asked a question | Detect page corners in a photo Detect page corners in a photo I have tried 2 methodologies as follows:- conversion of image to Mat apply gaussian blu |
| 2017-09-12 03:35:53 -0600 | received badge | ● Enthusiast |
| 2017-09-01 05:21:58 -0600 | commented question | Extract largest contour in very colorful image in OpenCV Were you able to find an answer? |
| 2017-08-31 00:25:54 -0600 | commented answer | How can I get the corner points of the largest contour (in Java/Android preferably) I tried minAreaRect. That does enclose the largest contour and give me corners to perform the perspective transformation |
| 2017-08-30 01:55:51 -0600 | asked a question | How can I get the corner points of the largest contour (in Java/Android preferably) How can I get the corner points of the largest contour (in Java/Android preferably) I Convert an image into a Mat, diffe |