Why i get this error
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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;
2 个评论
Image Analyst
2020-12-25
编辑：Image Analyst
2020-12-25
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
采纳的回答
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
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
h(1, 1) & true % does not work
13 个评论
Walter Roberson
2020-12-25
Though if I recall correctly you can
h(1, 1) ~= 0 & true
Walter Roberson
2020-12-26
one of your two inputs is not a matrix of data, and is instead the handle to an image() or imshow() or imagesc() when it should not be. We would need to see the code you are calling the function with
Syeda Noor
2020-12-26
Steven Lord
2020-12-26
Using the variables in my example, don't try to perform arithmetic or logical operations on h, the output of a call to image or imagesc. Instead perform arithmetic or logical operations on im, the raw data.
Walter Roberson
2020-12-26
I suspect that you did
out = imshow(array > Threshold)
and assumed that the output would be the image array resulting from the comparison. The output of imshow is the handle to a graphic object.
Walter Roberson
2020-12-26
output = imshow(imcomplement(y));
As I said, the output of imshow is a graphics handle, not the array of data. Save the result of imcomplement to output and imshow(output)
Steven Lord
2020-12-26
As Walter said, replace:
output = imshow(imcomplement(y));
eval_metrics(output,groundtruth);
with something like:
C = imcomplement(y);
output = imshow(C);
eval_metrics(C,groundtruth);
Syeda Noor
2020-12-27
Syeda Noor
2020-12-27
KALYAN ACHARJYA
2020-12-27
编辑：KALYAN ACHARJYA
2020-12-27
From the Original Image or any other means?
Walter Roberson
2020-12-27
Try imbinarize()
Syeda Noor
2020-12-27
编辑：Syeda Noor
2020-12-27
Walter Roberson
2020-12-27
You have not posted a sample image.
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