It does work. In fact here is the code:
clc; % Clear the command window.
close all; % Close all figures (except those of imtool.)
workspace; % Make sure the workspace panel is showing.
format long g;
format compact;
fontSize = 16;
%===============================================================================
% Get the name of the image the user wants to use.
baseFileName = ‘index.jpg’;
folder = pwd;
fullFileName = fullfile(folder, baseFileName);
% Check if file exists.
if ~exist(fullFileName, ‘file’)
% The file doesn’t exist — didn’t find it there in that folder.
% Check the entire search path (other folders) for the file by stripping off the folder.
fullFileNameOnSearchPath = baseFileName; % No path this time.
if ~exist(fullFileNameOnSearchPath, ‘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
%=======================================================================================
% Read in demo image.
rgbImage = imread(fullFileName);
% Get the dimensions of the image.
[rows, columns, numberOfColorChannels] = size(rgbImage)
% Display image.
subplot(2, 4, 1);
imshow(rgbImage, []);
impixelinfo;
axis on;
caption = sprintf(‘Original Color Imagen%s’, baseFileName);
title(caption, ‘FontSize’, fontSize, ‘Interpreter’, ‘None’);
hp = impixelinfo(); % Set up status line to see values when you mouse over the image.
% Set up figure properties:
% Enlarge figure to full screen.
set(gcf, ‘Units’, ‘Normalized’, ‘OuterPosition’, [0 0.05 1 0.95]);
% Get rid of tool bar and pulldown menus that are along top of figure.
% set(gcf, ‘Toolbar’, ‘none’, ‘Menu’, ‘none’);
% Give a name to the title bar.
set(gcf, ‘Name’, ‘Demo by ImageAnalyst’, ‘NumberTitle’, ‘Off’)
drawnow;
% Extract the individual red, green, and blue color channels.
redChannel = rgbImage(:, :, 1);
greenChannel = rgbImage(:, :, 2);
blueChannel = rgbImage(:, :, 3);
% Display the color channel images.
subplot(2, 4, 2);
imshow(redChannel);
caption = sprintf(‘Red Channel Image’);
title(caption, ‘FontSize’, fontSize, ‘Interpreter’, ‘None’);
impixelinfo;
axis on;
subplot(2, 4, 3);
imshow(greenChannel);
caption = sprintf(‘Green Channel Image’);
title(caption, ‘FontSize’, fontSize, ‘Interpreter’, ‘None’);
impixelinfo;
axis on;
subplot(2, 4, 4);
imshow(blueChannel);
caption = sprintf(‘Blue Channel Image’);
title(caption, ‘FontSize’, fontSize, ‘Interpreter’, ‘None’);
impixelinfo;
axis on;
drawnow;
% See if all three channels are identical.
% If so, it’s a gray scale image in a color image format.
subplot(2, 4, 5:8);
if isequal(redChannel, greenChannel) && isequal(redChannel, blueChannel)
% It’s gray scale.
imhist(redChannel); % Just take any one of them
else
redCounts = imhist(redChannel);
greenCounts = imhist(greenChannel);
blueCounts = imhist(blueChannel);
gls = 0 : 255;
plot(gls, redCounts, ‘r-‘, ‘LineWidth’, 2);
hold on;
plot(gls, greenCounts, ‘g-‘, ‘LineWidth’, 2);
plot(gls, blueCounts, ‘b-‘, ‘LineWidth’, 2);
xlabel(‘Gray Levels’, ‘FontSize’, 16);
ylabel(‘Counts’, ‘FontSize’, 16);
title(‘All 3 color histograms’, ‘FontSize’, 16);
end
grid on;
The reason that the color histograms are different, is because you unwisely chose to save the image in JPEG format. I believe the image should really be grayscale. Don’t use JPG format when doing image analysis.
From: Yang on 10 Oct 2009 09:44
Hi,
I am reading in a tif image file, and get the histogram of the image. However, getting the following error messages:
Can anyone help me here?
thanks
song
>> a = imread(‘song.tif’);
>> figure, imhist(a);
??? Error using ==> iptcheckinput
Function IMHIST expected its first input, I or X, to be two-dimensional.
Error in ==> imhist>parse_inputs at 270
iptcheckinput(a, {‘double’,’uint8′,’logical’,’uint16′,’int16′,’single’}, …
Error in ==> imhist at 57
[a, n, isScaled, top, map] = parse_inputs(varargin{:});
From: ImageAnalyst on 10 Oct 2009 09:57
On Oct 10, 9:44 am, «Yang » <songyang_2…(a)hotmail.com> wrote:
> Hi,
> I am reading in a tif image file, and get the histogram of the image. However, getting the following error messages:
> Can anyone help me here?
>
> thanks
> song
>
> >> a = imread(‘song.tif’);
> >> figure, imhist(a);
>
> ??? Error using ==> iptcheckinput
> Function IMHIST expected its first input, I or X, to be two-dimensional.
>
> Error in ==> imhist>parse_inputs at 270
> iptcheckinput(a, {‘double’,’uint8′,’logical’,’uint16′,’int16′,’single’}, ….
>
> Error in ==> imhist at 57
> [a, n, isScaled, top, map] = parse_inputs(varargin{:});
—————————————————————————————-
You need to supply a 2D image. Put this line before the imhist line:
size(a) % No semicolon
What does it print out to the command window?
From: Sufiah Ahmad on 14 Oct 2009 02:01
ImageAnalyst <imageanalyst(a)mailinator.com> wrote in message <d1188ec2-6505-443d-bbbd-224c30554d31(a)k33g2000yqa.googlegroups.com>…
> On Oct 10, 9:44?am, «Yang » <songyang_2…(a)hotmail.com> wrote:
> > Hi,
> > I am reading in a tif image file, and get the histogram of the image. However, getting the following error messages:
> > Can anyone help me here?
> >
> > thanks
> > song
> >
> > >> a = imread(‘song.tif’);
> > >> figure, imhist(a);
> >
> > ??? Error using ==> iptcheckinput
> > Function IMHIST expected its first input, I or X, to be two-dimensional.
> >
> > Error in ==> imhist>parse_inputs at 270
> > iptcheckinput(a, {‘double’,’uint8′,’logical’,’uint16′,’int16′,’single’}, …
> >
> > Error in ==> imhist at 57
> > [a, n, isScaled, top, map] = parse_inputs(varargin{:});
> —————————————————————————————-
> You need to supply a 2D image. Put this line before the imhist line:
> size(a) % No semicolon
> What does it print out to the command window?
__________________________________________
I tried..still got error.
the error are:
??? Error using ==> iptcheckinput
Function IMHIST expected its first input, I or X, to be two-dimensional.
Error in ==> imhist>parse_inputs at 270
iptcheckinput(a, {‘double’,’uint8′,’logical’,’uint16′,’int16′,’single’},
….
Error in ==> imhist at 57
[a, n, isScaled, top, map] = parse_inputs(varargin{:});
From: Steven Lord on 14 Oct 2009 09:25
«Sufiah Ahmad» <princesssufiah(a)gmail.com> wrote in message
news:hb3pfg$d8u$1(a)fred.mathworks.com…
> ImageAnalyst <imageanalyst(a)mailinator.com> wrote in message
> <d1188ec2-6505-443d-bbbd-224c30554d31(a)k33g2000yqa.googlegroups.com>…
>> On Oct 10, 9:44?am, «Yang » <songyang_2…(a)hotmail.com> wrote:
>> > Hi,
>> > I am reading in a tif image file, and get the histogram of the image.
>> > However, getting the following error messages:
>> > Can anyone help me here?
>> >
>> > thanks
>> > song
>> >
>> > >> a = imread(‘song.tif’);
>> > >> figure, imhist(a);
>> >
>> > ??? Error using ==> iptcheckinput
>> > Function IMHIST expected its first input, I or X, to be
>> > two-dimensional.
>> >
>> > Error in ==> imhist>parse_inputs at 270
>> > iptcheckinput(a,
>> > {‘double’,’uint8′,’logical’,’uint16′,’int16′,’single’}, …
>> >
>> > Error in ==> imhist at 57
>> > [a, n, isScaled, top, map] = parse_inputs(varargin{:});
>> —————————————————————————————-
>> You need to supply a 2D image. Put this line before the imhist line:
>> size(a) % No semicolon
>> What does it print out to the command window?
> __________________________________________
>
> I tried..still got error.
>
> the error are:
>
> ??? Error using ==> iptcheckinput
> Function IMHIST expected its first input, I or X, to be two-dimensional.
That’s correct. Execute this code:
a = imread(‘song.tif’);
numberOfDimensions = ndims(a)
If numberOfDimensions contains a value other than 2, you CANNOT use IMHIST
on this image directly; you will need to convert it to a 2D image, perhaps
by using RGB2IND if a is an m-by-n-by-3 array.
—
Steve Lord
slord(a)mathworks.com
comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ
From: Sufiah Ahmad on 14 Oct 2009 22:21
Thanks Steve , I tried your suggestion. there’s no error but the output is not the one that I want. …Threre’s no histogram ..it produce axis x & y with gray color only..no histogram bar
«Yang » <songyang_2005(a)hotmail.com> wrote in message <haq331$5aj$1(a)fred.mathworks.com>…
> Hi,
> I am reading in a tif image file, and get the histogram of the image. However, getting the following error messages:
> Can anyone help me here?
>
>
> thanks
> song
>
> >> a = imread(‘song.tif’);
> >> figure, imhist(a);
> ??? Error using ==> iptcheckinput
> Function IMHIST expected its first input, I or X, to be two-dimensional.
>
> Error in ==> imhist>parse_inputs at 270
> iptcheckinput(a, {‘double’,’uint8′,’logical’,’uint16′,’int16′,’single’}, …
>
> Error in ==> imhist at 57
> [a, n, isScaled, top, map] = parse_inputs(varargin{:});
image processing — imhist return error with bmp data in matlab —
i have image , want calculate historgram of it,but code return error ,
i=imread('image number one.bmp'); imhist(i); and error
??? error using ==> iptcheckinput function imhist expected first input, or x, two-dimensional. error in ==> imhist>parse_inputs @ 281 iptcheckinput(a, {'double','uint8','int8','logical','uint16','int16','single','uint32', 'int32'}, ... error in ==> imhist @ 59 [a, n, isscaled, top, map] = parse_inputs(varargin{:}); appreciate
i found solution, picture rgb , imhist work in 2-d input, need convert grascale with
i=rgb2gray(i);
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