showing error why?morphological hit and miss operation

Question

muzafar 2012-10-20

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/51380-showing-error-why-morphological-hit-and-miss-operation

评论： Torkan 2019-10-14

clc;
clear all;
close all;
bw=imread('hm.png');%reading image 1
figure;
imshow(bw);title('Original Image1 of dilation');%displaying original image 
se1=strel([0 0 0;0 1 1;0 1 0]);
se2=strel([1 1 1;1 0 0;1 0 0]);
bw2=bwhitmiss(bw,se1,se2);
figure;
imshow(bw2);
title('after hit and miss operation');%displaying original image 2

error is.........

Error using imageDisplayValidateParams>validateCData (line 121)
If input is logical (binary), it must be two-dimensional.
Error in imageDisplayValidateParams (line 31)
common_args.CData = validateCData(common_args.CData,image_type);
Error in imageDisplayParseInputs (line 79)
common_args = imageDisplayValidateParams(common_args);
Error in imshow (line 198)
  [common_args,specific_args] = ...
Error in hitmiss3 (line 11)
imshow(bw2);

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Matt J 2012-10-20

Please mark up your code so we can read it.

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Answer 1

Matt J 2012-10-20

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https://ww2.mathworks.cn/matlabcentral/answers/51380-showing-error-why-morphological-hit-and-miss-operation#answer_62630

Your bw is not class logical. Check "class(bw)" or "whos bw"

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Answer 2

Walter Roberson 2016-11-14

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https://ww2.mathworks.cn/matlabcentral/answers/51380-showing-error-why-morphological-hit-and-miss-operation#answer_243182

在 MATLAB Online 中打开

You have

bw=imread('hm.png');%reading image 1

and that is reading in an RGB image, which is a numeric array of dimension 3. That is supported by bwhitmiss, creating a binary (logical) 3D array.

imshow() does not know how to display 3D arrays of class logical.

If you want to use the binary values as indicating that the respective color channel is fully on or fully off, then

imshow( double(bw2) )

If you had thought the image was not RGB, then keep in mind that RGB images can look gray. png files are typically RGB, but sometimes are grayscale.

(jpg files on the other hand, are rarely stored as grayscale in my experience; I have only encountered perhaps two such files. So a jpg file is very likely an RGB file even if the image looks gray.)