Help: Edge detection technique of image

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ruban ramalingam
ruban ramalingam 2019-12-10
I have used the following code
close all;
a = imread('3.bmp');
imshow(a)
figure
imedge = edge(img, 'sobel',0.05);
imshow(imedge, 'ColorMap', [1 1 1; 1 0 0]);
figure
title('sobel');
img = imread('3.bmp');
imedge1 = edge(img, 'prewitt',0.05);
imshow(imedge1, 'ColorMap', [1 1 1; 1 0 0]);
figure
title('prewitt');
img = imread('3.bmp');
imedge2 = edge(img, 'canny',0.05);
imshow(imedge2, 'ColorMap', [1 1 1; 1 0 0]);
figure
title('canny')
resulting in the following error:
Attempt to execute SCRIPT image as a function:
C:\Users\Administrator\Documents\MATLAB\image.m
Error in images.internal.basicImageDisplay (line 24)
hh = image(cdata, ...
Error in imshow (line 321)
hh = images.internal.basicImageDisplay(fig_handle,ax_handle,...
Error in m6 (line 3)
imshow(a)
Please help me to sort out this error. Any help is much appreciated.

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