Weird offset in image when using this with facetracking

[faaip]

Hey.

This might not be the right place to post this, but I'll give it a shot. I'm trying to use a Black Magic deck link and use the image for facetracking using ofxDlib. For some reason it seems as though it is successfully tracking the face, but drawing the facetracking with some kind of offset.

This isn't a issue when using the built in webcam, which is my reason for posting this here.

Do you know how I could fix this?

Sorry if this issue is unrelated to ofxBlackMagic.

Best regards,
Frederik

[smallfly]

Hi,

Are you sure you are using the same image (format, resolution, etc) to feed the tracker and to display in the window?

Hugues.

[faaip]

Hi Hugues.

If I run the entirely same program, but using the webcam input it tracks without any issues. It is completely bewildering to me, since it seems to be tracking somehow but not offset with a certain proportionality. I've tried with different setups and I only get this outcome using BlackMagic.

[smallfly]

I was not clear.

With ofxBlackMagic you have access to the 'video data' in different formats.
Therefore are you sure you are using the same 'image' to feed the tracker and to display?
Are you drawing the image at the same size of the 'image' that you are feeding the tracker with?
Also with ofxBlackMagic the data includes 4 channels (ARGB or RGBA).

Those are things I thinking of without looking at your code, sorry if you have already checked all that.

[faaip]

Hi Hugues.

This is my code below.
`//--------------------------------------------------------------
void ofApp::setup(){
ft.setup("");
// video.setDeviceID(0);
// video.setup(720, 480);
cam.setup(1280, 720, 59.94);

}

//--------------------------------------------------------------
void ofApp::update(){
if(cam.update()){
ft.findFaces(cam.getColorPixels());
}
}

//--------------------------------------------------------------
void ofApp::draw(){
ofSetColor(255);
ofImage i = cam.getColorPixels();
i.draw(0, 0);
ft.draw(); // Drawing facetracker
}`

Here I added cam.getColorPixels() to ofImage i, just to be sure that they were fed the same as the face tracker. The offset is not a constant, but seems to increase the further I move to the right in the picture.

Thank you for your help.