convert the image to binary

Question

Md 2022-9-21

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1809045-convert-the-image-to-binary

评论： Image Analyst 2022-9-21

I need to convert the first image to the second image. I posted about this before but the answers didn't help. One of my classmate suggested me to do this (he said that repeat bwareopen and medfilt2 a few time at the end, no specific number), but it didn't help:

RGB=imread("center.jpg");
a=medfilt3(RGB);
b=rgb2gray(a);
c=medfilt2(b);
d=imbinarize(c);
e=medfilt2(d);
imshow(e);
f=bwareaopen(e,1);
g=medfilt2(f);
h=bwareaopen(g,1);
i=medfilt2(h);
imshow(i);
j=bwareaopen(i,1);
k=medfilt2(j);
l=bwareaopen(k,1);
m=medfilt2(l);

Can I get any suggestions? Thank you!

2 个评论
显示无隐藏无

Walter Roberson 2022-9-21

I need to convert this image to a clear binary image

Your code already converts to a "clear binary image" -- at least at least as much as you have defined "clear". Which is to say that since you did not indicate how "clear" is to be determined, any binary image satisfies the requirement.

Md 2022-9-21

I need the image to be like this.

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Walter Roberson 2022-9-21

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1809045-convert-the-image-to-binary#answer_1057585

移动：Image Analyst 2022-9-21

在 MATLAB Online 中打开

filename = 'https://www.mathworks.com/matlabcentral/answers/uploaded_files/1131025/image.jpeg';

RGB = imread(filename);

BW = all(RGB<64, 3);

imshow(BW)

center_only = bwareafilt(BW, 1);

imshow(center_only)

center_select = RGB .* uint8(center_only(:,:,[1 1 1]));

imshow(center_select)

That last image does not look like much, but it is the RGB of only the center line, with everything else set to 0. Maybe if we try

center_select2 = imcomplement(RGB) .* uint8(center_only(:,:,[1 1 1]));

imshow(center_select2)

This is an RGB image in "reverse color" in the center. Because the center that you are interested in happens to be dark.

Your target image has grayscale end-caps, but your source image has no end-caps. This last image, center_select2 would pull out grayscale if it meaningfully existed there.