Why my centroid are at different position?

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Ahmad Muzaffar Zafriy
评论： Walter Roberson 2022-12-16
Why my centroid is at different position?
clear all; close all; clc;
RGB = imread('sample4.jpg');
Ibw = imread('taskC_tags.tif');
%Ibw = imfill(Ibw,'holes');
Ilabel = logical(Ibw);
stat = regionprops(Ilabel,'centroid');
imshow(RGB); hold on;
% for x = 1: num1(stat)
% plot(stat(x).Centroid(1),stat(x).Centroid(2), 'ro');
% text(stat(x).Centroid(1),stat(x).Centroid(2), num2str(x), 'Color', 'b')
% end
% plot(stat(12).Centroid(1),stat(12).Centroid(2),'ro'); %mark centroid1
% plot(stat(13).Centroid(1),stat(13).Centroid(2),'ro'); %mark centroid2
% plot([stat(12).Centroid(1),stat(13).Centroid(1),[stat(12).Centroid(2),stat(13).Centroid(2)]); %draw line
% text(100, 100, [strcat('centroid1(', num2str(stat(12).Centroid(1)),',',num2str(stat(12).Centroid(2)),')') ),'Color',
x1 = stat(66).Centroid(1,1); y1 = stat(66).Centroid(1,1);
x2 = stat(1).Centroid(1,1); y2 = stat(1).Centroid(1,1);
plot(x1,y1,'ro'); %mark centroid1
plot(x2,y2,'ro'); %mark centroid2
plot([x1,x2],[y1,y2]); %draw line
text(100, 100, (strcat('centroid1: (', num2str(x1),' , ',num2str(y1),')') ), 'Color', 'b')
text(100, 130, (strcat('centroid2: (', num2str(x2),' , ',num2str(y2),')') ), 'Color', 'b')
dchessboard = max(abs(x1-x2),abs(y1-y2));
text(100, 160, (strcat('Distance(chessboard) : ', num2str(dchessboard)) ),'Color', 'b')

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回答（2 个）

Walter Roberson
Walter Roberson 2022-12-14
x1 = stat(66).Centroid(1,1); y1 = stat(66).Centroid(1,1);
x2 = stat(1).Centroid(1,1); y2 = stat(1).Centroid(1,1);
Your x1 and y1 are assigned the same values. You should be extracting (1,2) for y
Image Analyst
Image Analyst 2022-12-14
There is so much wrong with that I don't know where to start. But anyway, to answer your immediate question you need to change this
x1 = stat(66).Centroid(1,1); y1 = stat(66).Centroid(1,1);
x2 = stat(1).Centroid(1,1); y2 = stat(1).Centroid(1,1);
to this
x1 = stat(66).Centroid(1,1);
y1 = stat(66).Centroid(1,2);
x2 = stat(1).Centroid(1,1);
y2 = stat(1).Centroid(1,2);
If it's still no good then perhaps 1 and 66 are not always the indexes you want. They most certainly will NOT be if you have a different image. You need to improve your color segmentation algorithm to get only one blob for each colored card. Use the Color Threshold on the Apps tab of the tool ribbon. Threshold in HCV color space and then click the "Export function" button and call that function in your code. You'll have two of those functions, one for each color you want to detect.
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Image Analyst
Image Analyst 2022-12-16
What do you mean by "capture"? You already have the webcam image. Then if you burned some graphics into it, like with insertShape, then you have that RGB image as well. If you want to save it to disk, you can use imwrite.
Walter Roberson
Walter Roberson 2022-12-16
you are reading a webcam image into memory, processing the memory in various ways. You want to then draw on top of the image. But it is no longer the webcam image so capturing the webcam image after the drawing does not make sense.
If the goal is to capture the result of drawing on top of what was the webcam image, then that could make sense. If you use the insert* routines that I mentioned then their output *is * the captured results

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