How to remove all background noise due to inappropraite lighting from my pre-processed image and get better edge defination??

Question

Ron Herman 2020-7-24

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https://ww2.mathworks.cn/matlabcentral/answers/569941-how-to-remove-all-background-noise-due-to-inappropraite-lighting-from-my-pre-processed-image-and-get

回答： J. Alex Lee 2020-7-25

采纳的回答： J. Alex Lee

在 MATLAB Online 中打开

I have done some process on image and got the edge defined but unable to remove background noise.

I have used laplacian, sobel operator, average filter and power law for getting better edge defination

Are there any other methods for better edge defination and any way of removing background noise???

clc,clear
I=imread('warped_image.jpg');
aa=rgb2gray(I);
a=double(aa);
% Kernel for laplacian
kernel = [0,2,0; 2,-8,2; 0,2,0];
b = conv2(double(a), kernel, 'same');
c=b-a;
d=edge(a,'sobel');
% Kernel for smmothening by ave filter of 5*5
kernel1 = [1/9,1/9,1/9; 1/9,1/9,1/9; 1/9,1/9,1/9];
e = conv2(double(aa), kernel1, 'same');
f=c.*e;
g=a+f;
% transform law
[m,n]=size(a);
gamma=5;
cc=1;
for i=1:m
    for j=1:n
        h(i,j)=cc*(g(i,j)^gamma);
    end
end
imshow(h)