how to remove four black frame of image

2014 1 13
1 个回答
更新时间：2023 2 13
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Hi All,
I have an image and I want to remove four black frame of its corners without to remain any black pixel(i.e skin only ) in the image,please could any one explain to me using Matlab code how to do that without cropping ,using masking? thanks in advance.

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回答（1 个）

Image Analyst
Image Analyst 2014-1-13

0 个投票

If you take an image of a white scene, then you can divide your image by that to reduced or eliminate the vignetting.

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hamed abdulaziz
hamed abdulaziz 2014-1-13
Image Analyst: nice new icon,I downloaded this image and others from a data bast from medical site on the internet,and I want to segment the lesion in it for diagnosis,so that could help again, thank you in advance.
hamed abdulaziz
hamed abdulaziz 2014-1-13
Image Analyst,I am waiting your answer
Image Analyst
Image Analyst 2014-1-13
Can you just take the blue channel and threshold it? Or, use the delta E app in my File Exchange. Or run a texture filter on it like stdfilt() or entropyfilt() and then threshold. Or else look for published algorithms here: http://iris.usc.edu/Vision-Notes/bibliography/contents.html
hamed abdulaziz
hamed abdulaziz 2014-1-13
编辑：hamed abdulaziz 2014-1-13
I wrote this piece of code:
Image1 = imread('d:\10.bmp');
blue=Image1(:,:,3);
level=graythresh(blue);
bw=im2bw(blue,level);
figure, imshow(bw);
but I get this image
hamed abdulaziz
hamed abdulaziz 2014-1-13
编辑：hamed abdulaziz 2014-1-13
then I tried
Image1 = imread('d:\10.bmp');
j=entropyfilt(Image1);
level=graythresh(j);
bw=im2bw(j,level);
figure, imshow(bw);
but no reasonable result!
hamed abdulaziz
hamed abdulaziz 2014-1-13
移动：DGM 2023-2-13
Image Analyst,I am waiting your pretty answers for difficult questions as we are accustomed.
Image Analyst
Image Analyst 2014-1-13
编辑：Image Analyst 2014-1-13
I'm at work, doing my real job. I'm not a paid Mathworker who helps people in this forum all day. And I'm sure it's going to be a lot more complicated than just some 3-line piece of code.
hamed abdulaziz
hamed abdulaziz 2014-1-13
I am sorry to bother you ,I wish to you more and more of success in your job because you are smart person,and if you have a moment of the time,I am waiting your answer. Best regards
Image Analyst
Image Analyst 2014-1-13
编辑：Image Analyst 2014-1-13
Try inverting the binary image, then do a hole fill, then extract the biggest blob (see my code for that attached). You might also try activecontour() - a demo for activecontour is also attached.
hamed abdulaziz
hamed abdulaziz 2014-1-14
移动：DGM 2023-2-13
Thank you very much,I tried inverting the binary image, then did a hole fill, then extract the biggest blob using activecontour_demo ,I got the below result but no lesion only please guide me the modified activecontour_demo is also attached for reviewing if you have a time?
Image Analyst
Image Analyst 2014-1-14
移动：DGM 2023-2-13
See my attached code.
hamed abdulaziz
hamed abdulaziz 2014-1-16
移动：DGM 2023-2-13
Image Analyst : Thank you very much it is so useful code and excellent work.

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