gawky | A tiny and simple console tool for pull requests | Command Line Interface library
kandi X-RAY | gawky Summary
kandi X-RAY | gawky Summary
A tiny and simple console tool for pull requests.
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QUESTION
I have a number vector, let's say v=[1 1 1 1000 20 20]; I want to build very simple histogram-like plot where y-axis will be counts ( 3,1,2 in this case), but the x-axis will be 1,20,1000 equally spaced. Meaning that Matlab will ignore the fact that 1000>>20 and space them as it will 1,2,3 in the plot. I will show that I mean. I can do it by:
...ANSWER
Answered 2021-Aug-29 at 22:20first convert X to categorical matrix convert to categorical then histogramplot X with these categories: plot categorial histogram
in case of your problem:
QUESTION
I am attempting to find the area inside an arbitrarily-shaped closed curve plotted in python (example image below). So far, I have tried to use both the alphashape and polygon methods to acheive this, but both have failed. I am now attempting to use OpenCV and the floodfill method to count the number of pixels inside the curve and then I will later convert that to an area given the area that a single pixel encloses on the plot. Example image: testplot.jpg
In order to do this, I am doing the following, which I adapted from another post about OpenCV.
...ANSWER
Answered 2021-Jan-16 at 01:42The problem is your opening
operation at the end. This morphological operation includes a dilation
at the end that expands the white contour, increasing its area. Let’s try a different approach where no morphology is involved. These are the steps:
- Convert your image to grayscale
- Apply Otsu’s thresholding to get a binary image, let’s work with black and white pixels only.
- Apply a first flood-fill operation at image location
(0,0)
to get rid of the outer white space. - Filter small blobs using an area filter
- Find the “Curve Canvas” (The white space that encloses the curve) and locate and store its starting point at
(targetX, targetY)
- Apply a second flood-fill al location
(targetX, targetY)
- Get the area of the isolated blob with
cv2.countNonZero
Let’s take a look at the code:
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