Problem extracting data in a for loop

Hi everyone

I'm having a problem about extracting data from a for loop

function [BWdfill,CC,X,Y] = ObjectDetection(RGB)
%Color detection part
% Convert RGB image to chosen color space
B = step(RGB);
A = rgb2hsv(B);
% Define thresholds for channel 1 based on histogram settings
channel1Min = 0.679;
channel1Max = 0.836;
% Define thresholds for channel 2 based on histogram settings
channel2Min = 0.322;
channel2Max = 1.000;
% Define thresholds for channel 3 based on histogram settings
channel3Min = 0.361;
channel3Max = 0.790;
% Create mask based on chosen histogram thresholds
sliderBW = (A(:,:,1) >= channel1Min ) & (A(:,:,1) <= channel1Max) & ...
    (A(:,:,2) >= channel2Min ) & (A(:,:,2) <= channel2Max) & ...
    (A(:,:,3) >= channel3Min ) & (A(:,:,3) <= channel3Max);
BW = sliderBW;
BWs = bwareaopen(BW,100);
%Edgedetection part
BWss = edge(BWs,'canny',0.4); 
se90 = strel('line',3,90);
se0 = strel('line',3,0);
BWsdil = imdilate(BWss,[se90 se0]);
BWdfill = imfill(BWsdil,'holes');
CC = bwconncomp(BWdfill,8);
info = regionprops(CC,'Boundingbox');
[labeledImage, numBlobs] = bwlabel(BWdfill);
props = regionprops(labeledImage, 'Centroid', 'BoundingBox');
[labeledImage, numberOfObject] = bwlabel(BWdfill);
%Draw a bounding box
hold on
for k = 1:length(props)
  bc = props(k).Centroid;
  BB = props(k).BoundingBox;
  rectangle('Position', [BB(1),BB(2),BB(3),BB(4)],'EdgeColor','c','LineWidth',2) ;
% rectangle('Position',props(k).BoundingBox,'EdgeColor','b','LineWidth',2);
  x = props(k).Centroid(1);
  y = props(k).Centroid(2);
  X(k) = x;
  Y(k) = y;
%   ValueX = props(k).Centroid(1);
%   ValueY = props(k).Centroid(2);
  plot(x, y, 'r+', 'MarkerSize', 13, 'LineWidth', 2);
  % Find the left edge and right edge of the bounding box.
%   leftColumn = BB(1) + 0.5;
%   rightColumn = BB(1) - 0.5;
%   % Find the distance of them to the centroid.
%   leftDistance(k) = x - leftColumn
%   rightDistance(k) = rightColumn - x
  % Plot a line between them
%   line([leftColumn, rightColumn], [y, y], 'Color', 'g');
%   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', 'green'); 
  drawnow
end
end

My code above show you the way i draw a bounding box to cover an object

However, The x,y value from the for loop which I need to use can't be extracted

This is the error:

Output argument "Value" (and maybe others) not

assigned during call to

"testfunction>Objectdetection".

Error in testfunction (line 10)

[z,n,x] = Objectdetection(vid);

Can someone help me

Thanks a lot

Answer 1

[Matt J]

Your code is calling a function called Objectdetection, whereas the function you've posted and presumably intend to call is named ObjectDetection.