how to create a loop to calculate the mean of pixels of satellite data of a specified area like india? pixe size of the data is 1440*720

Question

Jincy 2023-5-15

0
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https://ww2.mathworks.cn/matlabcentral/answers/1963349-how-to-create-a-loop-to-calculate-the-mean-of-pixels-of-satellite-data-of-a-specified-area-like-indi

评论： Dyuman Joshi 2023-5-15

% Load or create an image

image = imread('your_image.jpg'); % Replace with your image file name or path

% Determine image size

[rows, columns, ~] = size(image);

% Variables to store sum and count

sumPixels = 0;

countPixels = 0;

% Loop to calculate sum of pixel values and count

for row = 1:rows

for col = 1:columns

% Access pixel value

pixelValue = image(row, col);

% Add to sum

sumPixels = sumPixels + pixelValue;

% Increment count

countPixels = countPixels + 1;

end

% Calculate mean

meanPixels = sumPixels / countPixels;

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Dyuman Joshi 2023-5-15

What seems to be the problem in your approach?

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Answer 1

Shaik 2023-5-15

在 MATLAB Online 中打开

Hey, check this once

% Load or create an image
image = imread('your_image.jpg'); % Replace with your image file name or path
% Define the region of interest (India)
startRow = 200;  % Starting row index of the ROI
endRow = 600;    % Ending row index of the ROI
startCol = 500;  % Starting column index of the ROI
endCol = 900;    % Ending column index of the ROI
% Variables to store sum and count
sumPixels = 0;
countPixels = 0;
% Loop to calculate sum of pixel values and count within the ROI
for row = startRow:endRow
    for col = startCol:endCol
        % Access pixel value
        pixelValue = image(row, col);
        
        % Add to sum
        sumPixels = sumPixels + pixelValue;
        
        % Increment count
        countPixels = countPixels + 1;
    end
end
% Calculate mean
meanPixels = sumPixels / countPixels;