Tagged Questions

A contour line for a function of two variables is a curve connecting points where the function has the same particular value.

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OpenCV TypeError: contour is not a numpy array, neither a scalar

I'm trying to use OpenCV to extract tags from Nike images. This is a tutorial code taken from: http://opencv-code.com/tutorials/ocr-ing-nikes-new-rsvp-program/ I've modified few lines of code though ...
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0answers
16 views

OpenCV concave and convex corner points of polygons

Problem I am working on a project where I need to get the bounding boxes of dumbell like shapes. However, I need the fewest points possible, and the boxes need to fit the shapes at all corners. ...
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10 views

MATLAB Plot White Contour Line

I am trying to make a contourfm plot while having the contour lines show up white. I did 'LineColor', 'white', but when it draw the contour image in a movie, the white lines propagate instead of ...
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14 views

MATLAB Gradient in Lat Lon

I am trying to plot gradients in a movie. Making the movie part works, but my gradients code is not working. I'm also worried that just using 'gradient' will distort the map since I'm using lat and ...
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19 views

Detecting colored objects on a image which contains a dark background

I'm currently using OpenCV to try to detect objects on a black cloth covered table. The camera will not always be looking at the same direction (it's a robot's head) but only one image will be ...
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37 views

Matplotlib contour plot of matrix type

I'm getting hung trying to create a contour plot of three [1, m] numpy matrices. When I try to plot: plt.contour(reg.theta[0,:], reg.theta[1,:], reg.J[0,:]) ValueError: The truth value of an array ...
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2answers
29 views

Matlab - Band-like diagram

I am trying to reproduce a band-like diagram, like the one in figure from windows defrag. In principle, it can be easily obtained by doing a contourf of a matrix which is constant along one ...
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1answer
36 views

draw contour sort matlab

I have a problem. I have a a set of x and y coordinates by which I can draw a contour or a closed figure. However during my operation within the program the order of coordinates may change. So now if ...
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1answer
28 views

Contour MATLAB Bleeding

I am using level sets to identify object boundaries in noisy data. I am also using contours to plot the detected boundary, but because of the noise, the contour bleeds as it approaches to object. Is ...
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1answer
43 views

matplotlib: preventing a few very large (or small) values to affect my contour

in plotting the data some times there are a few very large (or very small) numbers which, if not taken care of, will affect the contour in a bad way. a solution is to take out the 10% highest and ...
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1answer
54 views

How to Smooth a Plot in Matplotlib Without Losing Contour Lines?

I have some jagged contour plots that I need to smooth. I need to smooth them out without losing any of the contour lines. I have referred to these SO questions, but they don't quite offer a ...
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1answer
24 views

MATLAB Plotting dot in a specific area over a contourfm plot

I have a contourfm plot on which I want to place a dot. The contourfm plot by itself works fine with no error. But when I try to place a dot at a specific point, it overrides the contourfm plot and ...
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41 views

How to find the mean color of a connected component?

It seems like OpenCV does not have a direct method to find mean color of a connected component -or a contour. I used pointPolygonTest; saved all the points and their colors inside my contour; than ...
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1answer
53 views

Count the no of pixels on a polygon

I have been taking an image and drawing a contour on it. I need to count the no of pixels and the positions of them too in three categories (in MATLAB) The pixels that are outside the curve The ...
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0answers
13 views

JavaCV: get the contour of a shape inside the image

Please is there any way to get the contour of an object/shape located within the input image using JavaCV or OpenCV? Here is a picture of the input image I have for example: ...

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