All Questions
1,212
questions
0
votes
1
answer
46
views
To select the first closed round of an image while reading it from left to right
Here, I used the character image like this. When I tried to select only the first closed round portion of the input image, while scanning it from left to right using open_cv -, I got the whole outer ...
0
votes
1
answer
79
views
OpenCV code fail to detect overlapping rectangles in an image
I am using OpenCV to detect rectangles in an image based on their color. The code works well for non-overlapping rectangles, but it fails to detect overlapping rectangles.
Here's code I am using
...
- 354
0
votes
0
answers
30
views
The contour is reduced in equal proportions
I'm using opencv's findContours() function to get the contour of the image:
contour, hierachy = cv2.findContours(canny, cv2.RETR_TREE, cv2.CHAIN_APPROX_NONE)
Expectation: How to use Python to reduce ...
1
vote
0
answers
58
views
Cropping Images in Python/OpenCV so Image Doesn't Include Dead/White/Black Space (Different Size Height/Width)
Background
I have been working to stitch together multiple images in a grid (2 by 2 in this case) using SIFT and ANN. When all of the images are the same orientation, translation scale factor, my ...
- 9
0
votes
0
answers
74
views
Determine corner coordinates and Draw contours in OpenCV
Binary mask:
Expected image:
I am working on OpenCV-Python and I have an binary image below.
Next I have an "expected" image that has the contours on it. In this example image, it has 5 ...
-2
votes
2
answers
227
views
Detecting a contour in a noisy image
I am trying to detect the contour of the die edge in the picture, but there is an obstacle on the right top of the image.
Original picture:https://pan.quark.cn/s/0cdf6fe9784f
Whole dataset: https://...
- 7
0
votes
0
answers
27
views
OpenCV - Detect triangles within detected rectangle in real-time video
For a project I want to detect the edges of triangular shapes within a detected rectangular object (tray) in real-time on a Raspberry Pi IR camera, for the follow up to a next step.
For now I've ...
- 1
0
votes
0
answers
45
views
Segmenting all contours or a better approach for these pellets
I am attempting to find the governing equation for the Position(x,y,t) and Orientation θ(x,y,t) of these pellets, which collectively behave as a fluid. To perform flow analysis and find governing ...
- 11
2
votes
1
answer
193
views
Extract photos from a photo album using Python
I have a physical photo album, for which each page might contain one or more photos glued on it.
I took a picture of each individual page, containing multiple photos.
Now, I placed all the pictures ...
- 481
0
votes
0
answers
70
views
Detecting first inner black circle and making a contour: openCV and Python
I want to detect the first inner black circle from the white solid using OpenCV and Python.
I have tried thresholding but it is not working properly.
imporrt cv2
guass_kernal = 5
eroded_kernal = (3, ...
0
votes
0
answers
148
views
How to find contours from a Sobel edge detection image
I am doing this to apply Sobel edge detection to an image
# Sobel edge detection
grad_x = cv2.Sobel(blurred_image, cv2.CV_64F, 1, 0, ksize=3)
grad_y = cv2.Sobel(blurred_image, cv2.CV_64F, 0, 1, ksize=...
- 53
0
votes
1
answer
188
views
Efficient Equidistant Point Sampling on Closed Contours in OpenCV
For a project, I extracted closed contours from silhouette images (MPEG-7 Core Experiment CE-Shape-1 Test Set) using OpenCV’s findContours with RETR_EXTERNAL and CHAIN_APPROX_NONE. I need an efficient ...
user23346248
-1
votes
1
answer
92
views
Unable to get left and right road edge
I am trying to find the points representing the left and right edge of a road mask(binary image). I have tried using contour detection but it is giving contour of whole image(including upper and lower ...
- 11
0
votes
0
answers
39
views
Why does contour detection not working properly in image cropping?
I currently have a database of images, where each of the image are vertically concatenated from 3 small images (they are varying in width and height). See example below:
As you can see, 3 images have ...
- 65
0
votes
0
answers
40
views
Detecting Irregular Circles with Small Dots Inside in an Image using OpenCV (Android)
Above is my image link"
I am working on an image processing task using OpenCV in Android, and I need assistance in detecting irregular circles within a rectangular bar.
The input image is in ...
- 1