pseudocode.txt

Algorithm:
1. Get subject’s raw (x, y) eye gaze pixel data for each sessions from the csv file.
2. Convert (x, y) pixel data to visual angle, θ.
3. Calculate velocity at each instantaneous visual angle using velocity FIR filter.
   Velocity FIR filter, h:
	h = {1, -1} 				for a 2-tap FIR filter
	h = {-3, -2, -1, 0, 1, 2, 3} 		for a 7-tap FIR filter
4. Label each velocity point below velocity threshold as a fixation point, otherwise as a saccade point. 
5. Collapse consecutive fixation points into fixation groups and saccade points into saccade groups.
6. Return fixations and Saccades


Pseudocode:
Fixation_Detection(θ[N], h[k], sac_min, sac_max, fix_max):
	//initialization of Velocity
	for i = 0 to N−k−1:
    		velocity[i] = 0

	//calculating velocity using velocity FIR Filter
	for i = 0 to N−k−1:
	    for j = 0 to k:
	        velocity[i] = velocity[i] + (θ[i+j]*h[j])
	
	//detection of fixation groups and saccade groups
	for i = 0 to N−k−1:
    		if (velocity[i] >= sac_min and velocity[i] <= sac_max):
			if (fixation_group is not empty):
				add fixation_group to fixations and clear fixation_group 			
			add gaze point (x[i], y[i]) of θ[i] to saccade_group
			
		else if (velocity[i] <= fix_max):
			if (saccade_group is not empty):
				add saccade_group to saccades and clear saccade_group		
			add gaze point (x[i], y[i]) of θ[i] to fixation_group
 
	if (fixation_group is not empty):
		add fixation_group to fixations and clear fixation_group
	if (saccade_group is not empty):
		add saccade_group to saccades and clear saccade_group 

	return fixations, saccades