How to draw centroid that include the value inside bounding box?

1 次查看（过去 30 天）
MOHAMAD AFIF
MOHAMAD AFIF 2015-2-9
评论： MOHAMAD AFIF 2015-2-12
Hello, I want to ask for a little help. I'm writing a coding here on face tracking. But I dont know how to draw the centroid which also include the value inside the bounding box. Here's the coding:
clc
clear
%Create a detector object.
faceDetector = vision.CascadeObjectDetector;
%Read input image from Lenovo EasyCamera
obj = imaq.VideoDevice('winvideo', 1, 'MJPG_320x240');
set(obj,'ReturnedColorSpace','rgb');
%Preview(obj)
figure('menubar','none','tag','webcam');
while(true)
frame=step(obj);
%Detect faces.
bboxes = step(faceDetector,frame);
%Annotate detected faces.
IFaces = insertObjectAnnotation(frame,'rectangle',bboxes,'ME');
imshow(IFaces,'border','tight')
f=findobj('tag','webcam');
if(isempty(f))
close(gcf)
break
end
pause(0.05)
end
%closepreview(obj)
release(obj)

请先登录，再回答此问题。

回答（2 个）

Erik S.
Erik S. 2015-2-9
Hi
Use the vision.BlobAnalysis method. It returns both bounding box and centroid.
  1 个评论
Image Analyst
Image Analyst 2015-2-9
MOHAMAD's "Answer" moved here since it's not an Answer to the original question:
If I'm using vision.CascadeObjectDetector, can it be done too? Thank you for your help Erik S. :)

请先登录，再进行评论。

Dima Lisin
Dima Lisin 2015-2-9
Hi Mohamad,
vision.CascadeObjectDetector gives you bounding boxes of the form [x, y, width, height]. You can compute the centers of the bounding boxes as follows centers = bboxes(:, 1:2) + bboxes(:, 3:4) / 2. Then you can use the insertMarker function to mark the centers in your image.
  4 个评论
显示 2更早的评论
MOHAMAD AFIF
MOHAMAD AFIF 2015-2-11
I have try it, but still the bounding box doesn't show the value of the centroid
MOHAMAD AFIF
MOHAMAD AFIF 2015-2-12
After try and try and make a lots of troubleshoot in the coding, I've get what I want. Thank you Dima Lisin for your help and guide. It really work!! :)

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Computer Vision with Simulink 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by