21 lines
1.1 KiB
Matlab
21 lines
1.1 KiB
Matlab
function [x_offset, y_offset] = get_fixation_offset(eye_x, eye_y, event_marker, fixation_event_marker, fixation_x, fixation_y)
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% [x_offset, y_offset] = get_fixation_offset(eye_x_pos, eye_y_pos, event_marker, fixation_event_marker, fixation_x, fixation_y)
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%
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% Estimates the x, and y-offset between screen position and reported eye position while fixating
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%
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% Arguments:
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% eye_x, eye_y: The eye positions reported by the tracker, vectors of coordinates
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% event_marker: vector, the recorded event markers
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% fixation_event_marker: scalar, the event marker that represents the fixation period
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% fixation_x, fixation_y: scalar, the x and y position of the fixation cross on the screen
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%
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% Returns:
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% x_offset, y_offset: scalar the deviation between reported x
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% and y positions and the true positions.
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eye_fixation_x_pos = median(eye_x(event_marker == fixation_event_marker));
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eye_fixation_y_pos = median(eye_y(event_marker == fixation_event_marker));
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x_offset = fixation_x - eye_fixation_x_pos;
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y_offset = fixation_y - eye_fixation_y_pos;
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