imtranslate command matlab shows me a black image

Question

alessiadele 2019-1-14

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https://ww2.mathworks.cn/matlabcentral/answers/439667-imtranslate-command-matlab-shows-me-a-black-image

回答： PARVATHY M 2021-8-3

采纳的回答： Omer Yasin Birey

在 MATLAB Online 中打开

Hi everyone!

I'm trying to translate an image read through imshow function, but the output is a black image.

Here's the code:

fingers=imread('thumb-index.png');
[nrows,ncols] = size(fingers);
RI = imref2d(size(fingers));
h = imshow(fingers,RI);
grid on
x_center=ncols/2;
y_center=nrows/2;
x_orig=ncols-x_center;
y_orig=nrows-y_center;
[fingers_translate,RF]=imtranslate(fingers,RI,[x_orig,y_orig]);
figure
h=imshow(fingers_translate,RI);
grid on     

My target is translating the origin of coordinate system in the center of the image.

Thank you!

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PARVATHY M 2021-8-3

Hello! I'm trying to translate an image that is read using imread.

The code is; f=imread('C:\users\hp\Desktop\rbcimg.jpg'); I=rgb2gray(f); J=imtranslate(f,[20,25]); plot,imshow(J)

But an error is appearing showing that, undefined function or method 'imtranslate' for input arguments of type 'uint8' So how to rectify this? My matlab version is R2010a 7.10.0 Plase help!!

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Answer 1

Omer Yasin Birey 2019-1-14

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https://ww2.mathworks.cn/matlabcentral/answers/439667-imtranslate-command-matlab-shows-me-a-black-image#answer_356305

编辑：Omer Yasin Birey 2019-1-14

在 MATLAB Online 中打开

It would be much better if you shared your image. Anyway, probably imtranslate doesn't return black image, the blackness comes from your original image(I mean some parts are black) and you just take the indexes where the blackness occur when trying to bound the imtranslate. You said you want to place the origin at the center so if you don't want to save the image data you may use this.

fingers=imread('thumb-index.png');
[nrows,ncols] = size(fingers);
RI = imref2d(size(fingers));
h = imshow(fingers,RI);
grid on
minFind = (min(ncols,nrows)); 
[fingers_translate,RF]=imtranslate(fingers,RI,[300,400]);
figure
imagesc([-minFind,minFind],[-minFind,minFind],fingers)
grid on  

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alessiadele 2019-1-14

Yes, I tried to modify the code as you said, and now it works!

Thank you :D

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Answer 2

PARVATHY M 2021-8-3

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/439667-imtranslate-command-matlab-shows-me-a-black-image#answer_759407

Hello! I'm trying to translate an image that is read using imread. The code is; f=imread('C:\users\hp\Desktop\rbcimg.jpg'); I=rgb2gray(f); J=imtranslate(f,[20,25]); plot,imshow(J) But an error is appearing showing that, undefined function or method 'imtranslate' for input arguments of type 'uint8' So how to rectify this? My matlab version is R2010a 7.10.0 Plase help!!