Shelf shopper view point
Goal: Find the point in the shelf where the shopper is looking at. Based on head pose angles (x,y,z) and left- and right eye (x,y) angles. (yaw,pitch,roll)
Given:
Shelf height 2m (x 1m width)
Camera position = 1.5m inside the shelf (see picture)
Camera Resolution = 320px * 180px
Camera Focal length = 2.3mm
Camera DPI = 360
Assume Human Face height (real life) = 18cm
Head Rotation Angle (x,y,z) Eye Rotation (left,right eye) (x,y) relative to the Head Rotation Angle
We can always get the rectangle (face) inside a picture of a picture 320px * 180px (webcam).
Approach:
1.) Calculate the distance first: I used the formula:
Distance (cam to face) = Human Face height in real life m * camera focal length (mm) / human face height in picture (mm)
with:
human face height in picture (mm) = 2.54 * human face height in picture (px) / Camera DPI
My Problem:
I don’t know if it possible to solve this by somehow calculating a persons height, through knowing the camera offset height. All angles are related to the camera position, but I want to calculate the point being focused on the shelf.
The image is just a 2D example. I believe I need some translation function, rotation (head), rotation (eye) matrix to solve this?
I don’t know what is the best approach. Thank you for help.