Gaze Tracking -Shashank Shekhar Aim To estimate a person's gaze - - PowerPoint PPT Presentation

Gaze Tracking

• Shashank Shekhar

Aim

• To estimate a person's gaze using a webcam.
• Gaze tracking can be used in interactive

applications as a means to take inputs.

Possible Approaches

• 3-D gaze tracking
• Estimates 3-D gaze

and find the point of intersection with screen

• Requires stereo

camera.

• 2-D gaze tracking
• Uses a 2-D mapping

function to map gaze from image to screen

• Requires near IR light
• r high resolution

webcam

2-D gaze tracking

• Uses pupil-glint vector and maps it to screen

point by using following eqns

– Xs = a + a1 * Vx + a2 * Vy + a3 * Vx *Vy – Ys = b + b1 * Vx + b2 * Vy + b3 * Vy *Vy –

Challenges

• Extraction of glint is fairly easy by using a strong

light source.

• Extraction of pupil from iris as background is

tricky and requires a fairly high resolution camera.

Work Done till Now

• Head and eye detection using Haar cascades
• The image after using canny edge detector clearly

shows the glint but pupil extraction would require some work.

Questions ??