What method can I use for background subtraction before performing analysis on my image?

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Neo 2023-1-15

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https://ww2.mathworks.cn/matlabcentral/answers/1894195-what-method-can-i-use-for-background-subtraction-before-performing-analysis-on-my-image

评论： Neo 2023-1-16

采纳的回答： Image Analyst

Hi, i am exploring matlab methods for personal growth and i want to determine how to:

perform background substraction

contrast correction, gaussian filtering and thresholding and binarization for my image.

I have attached a demo m file and image and i get this error:

Unrecognized function or variable 'lowThreshold'.

Error in testfiltering (line 53)

mask = grayImage > lowThreshold & grayImage < highThreshold;

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Answer 1

Image Analyst 2023-1-15

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https://ww2.mathworks.cn/matlabcentral/answers/1894195-what-method-can-i-use-for-background-subtraction-before-performing-analysis-on-my-image#answer_1148905

You need to assign that value. See the interactive thresholding program in my File Exchange for how to do that.

See my Image Processing Tutorial in my File Exchange:

Image Analyst's File Exchange

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Image Analyst 2023-1-16

I don't know how to answer this. If you started with an image and a background image, you would certainly know if your code did a background subtraction. If you don't have the original image and the background image, then where did you get the image that you have?

"how do I know if the thresholidng i see matches the thresholding i want?" I don't know what this means. It MUST match the threshold you want. If it was not what you wanted, then why did you accept it? Obviously you're only going to accept a threshold that you want. You're not going to accept a threshold that you do not want, of course. That said, it may be that there is no threshold value that will give you a perfect segmentation just by thresholding alone.

Neo 2023-1-16