How to convert binary image to RGB image in matlab?

52 次查看（过去 30 天）

Anushka 2015-6-5

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/222608-how-to-convert-binary-image-to-rgb-image-in-matlab

评论： Walter Roberson 2022-2-5

How to convert binary image to RGB image in matlab?I have converted an RGB image into binary using J1=im2bw(J1);.Now I want to convert it back to RGB image.

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Guillaume 2015-6-5

It is of course impossible (for a computer or a human) to recreate information that has been purposefully deleted.

请先登录，再进行评论。

请先登录，再回答此问题。

回答（2 个）

Titus Edelhofer 2015-6-5

3
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/222608-how-to-convert-binary-image-to-rgb-image-in-matlab#answer_181668

在 MATLAB Online 中打开

Hi,

you need to replicate the bw image for each color channel, convert to uint8 and multiply by 255:

J1 = 255 * repmat(uint8(J1), 1, 1, 3));

Note that of course it will still be black and white only ;-).

Titus

7 个评论
显示 5更早的评论隐藏 5更早的评论

Anushka 2015-6-5

But by using Bitxor also I didnt obtain back the RGB image correctly.

Guillaume 2015-6-5

Please comment in that other question. bitxor is what you want, if you do not get the right result, you must have made an error in your code, so please post it.

请先登录，再进行评论。

Luis González Guzmán 2017-4-26

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/222608-how-to-convert-binary-image-to-rgb-image-in-matlab#answer_264529

编辑：Walter Roberson 2017-4-26

在 MATLAB Online 中打开

function [RGB_Image] = convertBinImage2RGB(BinImage)
[fil, col] = size(BinImage);
RGB_Image = zeros(fil,col, 3);
[posX , posY] = find(BinImage==1);
numIter = size(posX,1)*size(posX,2);
for ii = 1 : numIter
      RGB_Image(posX(ii),posY(ii), 1:3) = 255;
end % for
end % function

3 个评论
显示 1更早的评论隐藏 1更早的评论

john 2022-2-5

在 MATLAB Online 中打开

Please could you tell what the below line does?

BinImage(:,:,[1 1 1]) * 255 )

it multiples all row and columns by 255 i understood this.

but what does [1 1 1] does?

Walter Roberson 2022-2-5

在 MATLAB Online 中打开

BinImage(:,:,K)

selects all of the 3D panes of BinImage that match the values in K, in order, right?

Well, there is no restriction against duplicating an index. Just the same way that you could say BinImage(:,:,[1 2]) or something like BinImage(:,:,[3 2 1]) if you had reason to (and the array was the right size), you can also ask for BinImage(:,:,[1 1 1]) which means to take the first pane of BinImage three times. Those would, of course, all be the same. So BinImage(:,:,[1 1 1]) for a 2D array BinImage would be the same as repmat(BinImage, 1, 1, 3), three copies of the 2D array BinImage, arranged as a 3D array.

So overall the code makes three stacked copies of BinImage, multiplies the result by 255 (getting out values that are either 0 or 255 in each location), and then uint8() to convert those all to uint8(0) and uint8(255) . An RGB image that is full black (where the 0's are), or full white (where the 255 are)

请先登录，再进行评论。

请先登录，再回答此问题。