I am trying to detect playing cards and transform them to get a bird's eye view of the card using python opencv. My code works fine for simple cases but I didn't stop at the simple cases and want t...

As the following piece of code shows, the tensorflow tf.nn.dilation2D function doesn't behave as a conventional dilation operator. import tensorflow as tf tf.InteractiveSession() A = [[0, 0, 0, 0...

I'm trying to morphologically close a volume with a ball structuring element created by the function SE3 = skimage.morphology.ball(8). When using closing = cv2.morphologyEx(volume_start, cv2.MORPH_...

Why is the structuring element asymmetric in OpenCV? cv2.getStructuringElement(cv2.MORPH_ELLIPSE, ksize=(4,4)) returns array([[0, 0, 1, 0], [1, 1, 1, 1], [1, 1, 1, 1], [1, 1, 1, 1]], dtype...

I've been using morph opening in OpenCV to reduce noise outside of my ROI in images via opencv, and until now, whenever I need a higher degree of noise reduction I just randomly increase kernel siz...

I'm currently using morphology transformations on binary images with OpenCV 2.4 I just noticed that using the built-in functions of OpenCV, all my pixels' positions are shifted right and down by o...

I want to create a disk shaped structuring element on OpenCv. I need my SE to be similar with sel = strel('disk',5); I want to do this using cvstructuringElementEx(cols,rows,anchor_x,anchor_y...

A biologist friend of mine asked me if I could help him make a program to count the squama (is this the right translation?) of lizards. He sent me some images and I tried some things on Matlab. F...

I am trying to find the the largest object in an image and remove any other objects in the image that are smaller than it. This is what I have but I cannot get it to work. l=bwlabel(BW); %the ...

Given a contour outlining the edge of the letter S (in comic sans for example), how can I get a series of points along the spine of this letter in order to later represent this shape using lines, c...

I am having trouble achieving the correct segmentation of a grayscale image: The ground truth, i.e. what I would like the segmentation to look like, is this: I am most interested in the three...

I have many skeletonized images like this: How can i detect a cycle, a loop in the skeleton? Are there "special" functions that do this or should I implement it as a graph? In case there is o...

If I have a structuring element looks like this one (the origin is at the center of SE): 0 0 0 0 0 0 0 0 0 If I perform the erosion/dilation on an binary image, the result turns out all 0 or 1....

I've got a question regarding the following scenario. As I post-process an image, I gained a contour, which is unfortunately twice connected as you can see at the bottom line. To make it obvious wh...

I have pictures of a surface with many grooves. In most cases the edges of the grooving form parallel lines so Canny and Hough transformation work very good to detect the lines and to do some chara...

When i use the canny edge algorithm, it produces the 2 edges opposite the thick colored line as expected, but i want only one edge to be displayed so as to make my line and curve detection algorith...

In the following code I want to use the dilate function but I don't know how to cast a Mat class into a InputArray and OutputArray. Can you help me? Using this prototype function: void dilate(Inp...

The objective of skeletonization is to represent a binary image with a minimum set of pixels. The skeleton must account for geometrical properties of the form and retain associative relationships. ...