Black & white image segmententation and automatic counting
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Hello,
I'm new to MATLAB and wondering if i can do a special automated image analysis as below:
- Detect white points on image
- Count all points
- Measure points
- Divide the frame by lines and detect if the line cross the abovementioned points
Please respond if it is possible with some hints if so.
Thank you![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/208720/image.jpeg)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/208720/image.jpeg)
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Antworten (1)
Soya AOKI
am 16 Mär. 2019
Bearbeitet: Soya AOKI
am 16 Mär. 2019
Hi
(1) Detect, Count and Measure points
(2) Detect if the line cross points
Circular detection returns center(x,y) and radius R. So you can detect if the line cross points by following code I think.
if ((center_y + radius) is above line & (center_y - radius) is under line)
cross_flg = true
else
cross_flg = false
end
thanks
5 Kommentare
Soya AOKI
am 16 Mär. 2019
Bearbeitet: Soya AOKI
am 16 Mär. 2019
Thanks for your info.
(1) Detect, Count and Measure points
For all shape, you could count and measure location and area by these method.
(2) Detect if the line cross points
You can get binary image like this. 1 means white(points) and 0 means black(not points).
0 0 0 0 1 1 1 1 0 0 0 0 0
0 0 0 1 1 1 1 1 1 0 0 0 0
Line → 0 0 1 1 1 1 1 1 1 1 0 0 0
0 0 0 1 1 1 1 1 1 0 0 0 0
0 0 0 0 1 1 1 1 0 0 0 0 0
"1 (points) exists on line area" means "the line cross points". so you can detect if the line cross points by checking if there is 1 on line area I think.
And difference of neighboor pix on the line is following.
0 -1 0 0 0 0 0 0 0 1 0 0
Maybe you can count points crossing line by counting 1 or -1 in the difference.
Or if line is shown as red on image (like your image), you could detect if the line cross points by R component of the original image.
(Please excuse me for little bit confusing explanation.)
Thanks.
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