Why i get this error

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Syeda Noor 2020-12-25

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https://ww2.mathworks.cn/matlabcentral/answers/702337-why-i-get-this-error

评论： Walter Roberson 2020-12-27

Undefined operator '&' for input arguments of type 'matlab.graphics.primitive.Image'. why i am getting this error. i have to multiply 2 binary images pixel by pixel in matlab. groungtruth and output are two binary images. both are same but are segmented with two different techniques.

function r=eval_metrics(output,groundtruth)

TP_image=groundtruth&output;

TP=sum(TP_image(:));% # of hits (True Positive)

FN_image=groundtruth&~output;

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Image Analyst 2020-12-25

编辑：Image Analyst 2020-12-25

在 MATLAB Online 中打开

Before the error, put this:

whos output
whos groundtruth

What do you see in the command window? How did you actually get the image that is not a logical array but is actually of type 'matlab.graphics.primitive.Image'?

Is this the same as https://www.mathworks.com/matlabcentral/answers/702337-why-i-get-this-error?s_tid=srchtitle

where we're not sure if you've accepted an answer or not and never attached your image so people can run your code. If so, then why? If not, what's the difference?

Rik 2020-12-27

Not really the Christmass spirit, to edit away your question. I restored it from the Google cache.

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采纳的回答

Steven Lord 2020-12-25

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https://ww2.mathworks.cn/matlabcentral/answers/702337-why-i-get-this-error#answer_584267

编辑：Steven Lord 2020-12-25

在 MATLAB Online 中打开

Generally you're going to want to perform arithmetic and/or logical operations on the image data not the image graphics object.

im = imread('eight.tif');

h = imagesc(im);

whos im h

Name Size Bytes Class Attributes h 1x1 8 matlab.graphics.primitive.Image im 242x308 74536 uint8

Arithmetic and logical operations are defined on variables of class uint8 but not on variables of class matlab.graphics.primitive.Image.

im(1, 1) & im(1, 2) % works
ans = logical
   1
h(1, 1) & true % does not work
Operator '&' is not supported for operands of type 'matlab.graphics.primitive.Image'.