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Explain the following MATLAB code?
This MATLAB code seems to be used to detect faces in real time in the camera. Let me help you explain the functions of each part:

Clc: Clears all output on the command line.

Clear All: Delete all variables.

Close All: Close all graphics windows.

Web = webcam (): Create a webcam object.

Pic =web.snapshot: Capture images with webcam objects.

Det face = vision. Cascade object detector (): Create a face detector.

Imshow(pic): display images.

While true: starts an infinite loop.

Pic=web.snapshot: Capture images with webcam objects.

Pic2=rgb2gray(pic): converts the image into a gray image.

Bbox = step(detface, pic): Use the face detector to detect the face in the image.

Img = InsertObject annotation (PIC, ... rectangle', BBOX,' face'): marks the detected face in the image.

Imshow(img): displays the marked image.

I hope these explanations will help you understand the function of the code.