MATLAB: How make x and y -axis labels(titles) for histogram of an image

histogram labels of 2dImage Processing Toolbox

i execute the following matlab code to display histogram of gray scale image with x-axis and y-axis names but i didnot get names in x-axis and y-axis labels.

k=imhist(image)
xlabel('grayscale range')
ylabel('intensity values range');

Best Answer

Your code should have worked. Try my boilerplate code snippet:

% Let's compute and display the histogram.
[pixelCount, grayLevels] = imhist(grayImage);
bar(grayLevels, pixelCount); % Plot it as a bar chart.
grid on;
title('Histogram of original image', 'FontSize', fontSize);
xlabel('Gray Level', 'FontSize', fontSize);
ylabel('Pixel Count', 'FontSize', fontSize);
xlim([0 grayLevels(end)]); % Scale x axis manually.

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MATLAB: Compare the levels of gray

See this snippet

% Let's compute and display the histogram.
[pixelCount, grayLevels] = imhist(grayImage);
bar(grayLevels, pixelCount);
grid on;
title('Histogram of image', 'FontSize', 22);
xlim([0 255]); % or 65535 if image is uint16
% Compute and display mean
meanGrayLevel = mean2(grayImage);
message = sprintf('The mean gray level is %.2f', meanGrayLevel);
uiwait(helpdlg(message));

MATLAB: Axis numbers on histogram

% Demo to plot histogram and cdf of grayscale image.
% By ImageAnalyst
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.
fontSize = 14;
% Read in a standard MATLAB gray scale demo image.
folder = fullfile(matlabroot, '\toolbox\images\imdemos');
baseFileName = 'cameraman.tif';
fullFileName = fullfile(folder, baseFileName);
% Get the full filename, with path prepended.
fullFileName = fullfile(folder, baseFileName);
if ~exist(fullFileName, 'file')
  % 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.', 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(2, 2, 1);
imshow(grayImage, []);
title('Grayscale Image', 'FontSize', fontSize);
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1]);
set(gcf,'name','Demo by ImageAnalyst','numbertitle','off') 
% Let's compute and display the histogram.
[pixelCount grayLevels] = imhist(grayImage);
subplot(2, 2, 2); 
bar(pixelCount);
title('Histogram of image', 'FontSize', fontSize);
xlim([0 grayLevels(end)]); % Scale x axis manually.

grid on;
% Compute the CDF
cdf = cumsum(pixelCount) / numel(grayImage);
% Plot both hist and cdf on same plot
subplot(2,2,3);
bar(pixelCount);
hold on;
z = zeros(1,length(pixelCount));
plotyy(grayLevels, z, grayLevels, cdf);
title('Histogram and CDF of image', 'FontSize', fontSize);
xlim([0 grayLevels(end)]); % Scale x axis manually.
grid on;

Best Answer

Related Solutions

MATLAB: Compare the levels of gray

MATLAB: Axis numbers on histogram

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