Replace rectangle with image.

Programming Questions

apotdd

Replace rectangle with image.

in Programming Questions • 1 year ago

Hi all! Since I'm having no luck with my previous topic on eye tracking, I thought I could maybe get some help on this.

I'm a beginner at Processing and working with OpenCV to recognize a face in this case via webcam, and when it sees a face, it draws a rectangle on this face.

Now instead of that, I want an image to be displayed on the face (it doesn't need to be automatically scaled or something, just to be placed on top of the face is all I'm trying to do for now). I have no idea how to do that though, I only know how to import an image, that's all.

This is my code. Sorry for using a link by the way, but when I paste something in here, it loses all its markup.

Replies(6)

asimes

Re: Replace rectangle with image.

1 year ago

You can get the x and y position of the face detection box rect(). Set your image x and y to be the same.

faces[i].x and faces[i].y (in a for loop)

apotdd

Re: Replace rectangle with image.

1 year ago

Sorry for begin such a noob, but I have no idea how to do this. How do I get the x and y position of the rectangle and set my image to be the same? And for the loop, are you referring to the for loop that's already in the code?

asimes

Re: Replace rectangle with image.

1 year ago

Yeah, the one that is in the code already. What it is doing is drawing a rect() using the arguments:

faces[i].x, where the current face in the loop is in terms of 'x' (I say current face because there may be more than one)

faces[i].y, same thing but 'y'

faces[i].width, the width of the rectangle being drawn

faces[i[.height, the height of the rectangle being drawn

What you have to do is call an image and place it using faces[i].x and faces[i].y.

apotdd

Re: Replace rectangle with image.

1 year ago

Sorry, it's like you're talking Chinese. I understand the part where you explained what the faces do. But calling the image and place it using faces[i].x and faces[i].y.? Okay so I already imported the image which is called imageexample. Do you mean that by calling it? If so, what do you mean by placing it etc.? Do I have to replace the faces[i].x and faces[i].y. with the image x and y? How do I do that? Sorry I really just started with all this.

asimes

Re: Replace rectangle with image.

1 year ago

No, replace rect() with image() and use faces[i].x / faces[i].y as the first two arguments:

http://processing.org/reference/image_.html

for (int i = 0; i < faces.length; i++) {

// Use this if you don't want to scale images

image( yourImage, faces[i].x, faces[i].y );

// Use this if you want to scale images

image ( yourImage, faces[i].x, faces[i].y, faces[i].width, faces[i].height );

}

apotdd

Re: Replace rectangle with image.

1 year ago

Absolutely my bad, I read the previous message of yours wrong. I never thought it'd be this simple, so I also never thought of just replacing the rectangle with the image (initially I thought I had to do something with this line: "Rectangle[] faces = opencv.detect( 1.2, 2, OpenCV.HAAR_DO_CANNY_PRUNING, 40, 40 );" since there was "rectangle" in it. And then I thought I had to replace the faces[i].x and y with the image itself). Thank you a lot, I understand it now.

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