adaptive local global thresholding

Question

Matpar 2019-8-7

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/475229-adaptive-local-global-thresholding

回答： Kritika Bansal 2019-8-20

Hi all trying to figure out how to do a simple adaptive and a local thresholding for T=[30,25,67,49,96]

can someone guide me ASAP with a simple thresholding code that can do this?

please!!

Thanks

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Rik 2019-8-7

Comment posted as answer by Matpar:

ok my apologies and thanks for responding! i am trying to gain an understanding for what is actually happening within the codes!!

Rik 2019-8-7

You don't flag your questions as urgent. If you need it done so fast that you can't wait for free help, you need to hire a consultant. I doubt your course started with the practical you posted here. I would suggest you look at the instructions you already had and don't doublepost questions.

Also, using a lot of exclamation points comes across as shouty and rude. It probably discourages people from helping you, just like using phrases like 'ASAP' and 'please help me fast'. Your bad planning is your problem, don't push others if you started late. If the amount of time for your practical is unreasonable, talk to your teacher, and if he/she is unreasonable, talk to the dean.

You posted 4 questions in about 3 days and have gotten multiple comments and answers. You are not being ignored.

请先登录，再进行评论。

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Answer 1

Kritika Bansal 2019-8-20

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/475229-adaptive-local-global-thresholding#answer_388298

在 MATLAB Online 中打开

Hi,

To perform adaptive thresholding, you can use imbinarize in combination with adaptthresh function of MATLAB as follows:

T = adaptthresh(I); 
BW = imbinarize(I, T);  

The above 2 steps can also be combined into a single step as:

BW = imbinarize(I, ‘adaptive’);

If you have an RGB image, you may need to convert it to grayscale using rgb2gray() function and then use imbinarize. This is because imbinarize doesn’t binarize ever channel separately.

For more information on these two functions, you can refer to the documentation links below:

https://www.mathworks.com/help/images/ref/imbinarize.html

https://www.mathworks.com/help/images/ref/adaptthresh.html