taking part of the picture

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eman
eman 2012-11-25
Hi;
I'm newbie in mat lab and I've a picture that I need to cut or delete the bottom region of it and I've used this cod it makes error I do not know why and how can i take a portion of this picture and not all of it.
Here is the code:
ROI= imread('pic.jpg');
imfinfo('pic.jpg');%to know the number of columns and number of rows
nRows=1180;
nColumns=2039;
%Region Of Interest exclude the bottom part
% ROI=imresize(ROI,[nRows nColumns]);
ROI=ROI(1:1180,:);
imshow('pic.pg')
Thanks in advance

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采纳的回答

Harshit
Harshit 2012-11-26
Here is an error you can't use imshow on an image. You have to first read it in a variable then use imshow on that. imshow(ROI) is the correct answer
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Harshit
Harshit 2012-11-27
Sorry I agree image analyst point is correct.
eman
eman 2012-11-27
Thanks Image Analyst,Thanks Harshit I have accepted Harshit answer because when I changed the code from
imshow('pic.jpg') TO
imshow(ROI)
a figure has showed up
about what I'm saying my comment,I need to take a portion from the picture not whole the picture then I am going to use sobel edge detection. when the program ran it showed a figure with 3 copies of the original picture.
I hope that I clarify my problem.
Thanks again ,I hope you can help me.

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Image Analyst
Image Analyst 2012-11-26
You need to show your ROI variable, not some bad filename. You put pic.pg, not pic.jpg, so that doesn't exist, but anyway, even if a file by that name existed, that will display the full file, not a cropped portion of it. You should do it this way:
grayImage = imread('pic.jpg');
croppedImage = grayImage(1:1180, :);
imshow(croppedImage);
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Image Analyst
Image Analyst 2012-11-27
I find that hard to believe. Here, run this demo and see if it works:
clc; % Clear the command window.
close all; % Close all figures (except those of imtool.)
imtool close all; % Close all imtool figures.
clear; % Erase all existing variables.
workspace; % Make sure the workspace panel is showing.
format longg;
format compact;
fontSize = 20;
% Read in a standard MATLAB gray scale demo image.
folder = fullfile(matlabroot, '\toolbox\images\imdemos');
baseFileName = 'concordorthophoto.png';
% Get the full filename, with path prepended.
fullFileName = fullfile(folder, baseFileName);
% Check if file exists.
if ~exist(fullFileName, 'file')
% File doesn't exist -- didn't find it there. Check the search path for it.
fullFileName = baseFileName; % No path this time.
if ~exist(fullFileName, 'file')
% Still didn't find it. Alert user.
errorMessage = sprintf('Error: %s does not exist in the search path folders.', fullFileName);
uiwait(warndlg(errorMessage));
return;
end
end
grayImage = imread(fullFileName);
% Get the dimensions of the image.
% numberOfColorBands should be = 1.
[rows columns numberOfColorBands] = size(grayImage)
% Display the original gray scale image.
subplot(1, 2, 1);
imshow(grayImage, []);
title('Original Grayscale Image', 'FontSize', fontSize);
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1]);
% Give a name to the title bar.
set(gcf,'name','Demo by ImageAnalyst','numbertitle','off')
% Crop off the first 1180 lines and display that:
croppedImage = grayImage(1:1180, :);
[rows2 columns2 numberOfColorBands2] = size(croppedImage)
subplot(1, 2, 2);
imshow(croppedImage, []);
title('Cropped Grayscale Image', 'FontSize', fontSize);
eman
eman 2012-11-30
Thanks too much it works will.

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