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

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)

Answer 1

[Erik S.]

Hi

Use the vision.BlobAnalysis method. It returns both bounding box and centroid.

[Image Analyst]

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. :)

Answer 2

[Dima Lisin]

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.

[MOHAMAD AFIF]

Thank you Dima Lisin. Can you guide me how?

[Dima Lisin]

Please see the documentation for the insertMarker function.

[MOHAMAD AFIF]

I have try it, but still the bounding box doesn't show the value of the centroid

[MOHAMAD AFIF]

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!! :)