How can I apply a natural logarithm to an image?

Question

Lucaci Diana 2020-11-26

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/663878-how-can-i-apply-a-natural-logarithm-to-an-image

编辑： KALYAN ACHARJYA 2020-11-26

%%4 image natural log test 
%%apply natural log function on the image 'image' to get 'ln_image'
%%note: you need to use mat2gray to convert the format of the image
%also, change negative values to postivie for display purpose
%add instruction here
ln_image = ;
subplot(2,3, 5);
%use display image with scaled colors command (not imshow). put title 'natural log'
%add instructions here 
imagesc(ln_image);
title('Natural Log');

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Lucaci Diana 2020-11-26

well, since I m not as smart as you are, I don't get it

KALYAN ACHARJYA 2020-11-26

编辑：KALYAN ACHARJYA 2020-11-26

@Lucaci Most members of this community are great, they are giving their precious time to help us. It is expected to take the suggestions in a positive way. Trust me, these people are very knowledgeable and they are guiding millions, like you and me.

Seems home work question, in such cases your own efforts are expected. If you have any specific question, let us know..?

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Answer 1

Image Analyst 2020-11-26

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/663878-how-can-i-apply-a-natural-logarithm-to-an-image#answer_557033

Did you try ln_image =log(mat2gray(image))?

By the way it's a terrible idea for them to tell you to use the word "image" for your variable name. image() is a built-in function. If there are any zeros in your image you should add 1 to the image before taking the log of it.