I want to turn this code into led light instead of red ones

Question

Batuhan Istanbullu 2022-11-27

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1864938-i-want-to-turn-this-code-into-led-light-instead-of-red-ones

评论： Batuhan Istanbullu 2022-11-28

IMG_4236.JPG

在 MATLAB Online 中打开

Hi, I want to turn this code into led light instead of red ones. How may I do that; which part should I change?

Here is my code;

data =imread('IMG_4236.JPG');

% Now to track red objects in real time

% we have to subtract the red component

% from the grayscale image to extract the red components in the image.

diff_im = imsubtract(data(:,:,1), rgb2gray(data));

%Use a median filter to filter out noise

diff_im = medfilt2(diff_im, [3 3]);

% Convert the resulting grayscale image into a binary image.

diff_im = im2bw(diff_im,0.18);

% Remove all those pixels less than 300px

diff_im = bwareaopen(diff_im,300);

% Label all the connected components in the image.

bw = bwlabel(diff_im, 8);

% Here we do the image blob analysis.

% We get a set of properties for each labeled region.

stats = regionprops(bw, 'BoundingBox', 'Centroid');

% Display the image

imshow(data)

hold on

%This is a loop to bound the red objects in a rectangular box.

for object = 1:length(stats)

bb = stats(object).BoundingBox;

bc = stats(object).Centroid;

rectangle('Position',bb,'EdgeColor','r','LineWidth',2)

plot(bc(1),bc(2), '-m+')

a=text(bc(1)+15,bc(2), strcat('X: ', num2str(round(bc(1))), ' Y: ', num2str(round(bc(2)))));

set(a, 'FontName', 'Arial', 'FontWeight', 'bold', 'FontSize', 12, 'Color', 'yellow');

end

and here is the image

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Answer 1

Image Analyst 2022-11-27

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1864938-i-want-to-turn-this-code-into-led-light-instead-of-red-ones#answer_1113593

track_color_in_video.zip

I don't know what this means: "turn this code into led light instead of red ones".

You can't turn code into a light. The light you have in your scene is white. If you want a red LED instead of a white one, then put a red LED into your circuit. It has nothing to do with code. It has to do with electrical components and perhaps a soldering iron or a breadboard or other components to build circuits with.

The bright light in the image is not red. Plus your algorithm is just overly simplistic (even if the light were red) and basically no good. If you want to track a colored object in an image, see my attached demo where I track a green Sharpie marker in a video.

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Image Analyst 2022-11-27

在 MATLAB Online 中打开

Here is the code. It works for both your images and does not give the same location because the LED is in different locations in each image.

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 = 'IMG_4236.JPG';
baseFileName = 'distance.JPEG';
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 image.
rgbImage = imread(fullFileName);
% Get the dimensions of the image.
[rows, columns, numberOfColorChannels] = size(rgbImage)
% Display image.
subplot(2, 2, 1);
imshow(rgbImage, []);
impixelinfo;
axis on;
caption = sprintf('Original RGB Image\n%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.
g = gcf;
g.WindowState = "maximized";
% 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;
%=========================================================================================================================
% Threshold the image to create a mask of the objects
% [mask,maskedRGBImage] = createMask(rgbImage);
% Get bright regions.  Gray scale is fine because the LED in the image is not colored -- it's white.
mask = rgb2gray(rgbImage) > 250;
% Get rid of particles less than 1000 pixels.
% props = regionprops(mask, 'Area'); % Measure areas of our initial mask to determine areas of LED and possible noise.
% allAreas = [props.Area]
mask = bwareaopen(mask, 1000);
% Fill any holes in the blobs.
mask = imfill(mask, 'holes');
% Display the mask image.
subplot(2, 2, 2);
imshow(mask, []);
impixelinfo;
axis('on', 'image');
title('Mask Image', 'FontSize', fontSize);
drawnow;
%=========================================================================================================================
% Get location of the LED.
props = regionprops(mask, 'Centroid');
allCentroids = vertcat(props.Centroid) % works for multiple LEDs
% Display the centroid over the image as cross hairs
subplot(2, 2, 3);
imshow(rgbImage, []);
impixelinfo;
hold on;
markerSize = 50;
for k = 1 : length(props)
    plot(allCentroids(k, 1), allCentroids(k, 2), 'r+', 'MarkerSize', markerSize, 'LineWidth', 2);
    caption = sprintf('%d LEDs found.  This one at (x,y) = (%.1f, %.1f)', ...
        numel(allAreas), allCentroids(k, 1), allCentroids(k, 2))
    title(caption, 'FontSize', fontSize);
end
axis('on', 'image');
drawnow;

See how the crosshair in the lower left image is in a different location for each image?

I did not use the Color Thresholder code because there was no need. Your LED light is bright white, not a pure color so we didn't need to do color segmentation.