how to plot x y over time

this is te first time i used MATLAB i have eyetrack record like this

eyetrackRecord =

struct with fields:

x: [1.3756e+03 1.3734e+03 1.3798e+03 1.3789e+03 … ] (1×5128 double)

y: [416.1000 415.5000 416.6000 410.8000 … ] (1×5128 double)

pa: [1416 1423 1423 1421 1420 1424 1431 1417 … ] (1×5128 double)

t: [281349 281395 281403 281409 281418 281423 … ] (1×5128 double)

missing: [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 … ] (1×5128 double)

How can I plot the moving heatmap of gazing over the video file in MATLAB

Answer 1

[Yash]

Hi @Korrawit

Since you have the "eyetrackRecord" data variable, you can ustilise the hist3 function to get the heatmap.

numBins = [100, 100];

% Sample data
numPoints = 5000; frameWidth = 1920; frameHeight = 1080;
x = frameWidth * rand(1, numPoints);
y = frameHeight * rand(1, numPoints);

% Create a 2D histogram of the gaze data
heatmapData = hist3([y', x'], 'Nbins', numBins);
% Normalize
heatmapData = heatmapData / max(heatmapData(:));
% Display the heatmap
figure;
imagesc(heatmapData);
colormap('jet'); % Use a colormap to represent the heat values
colorbar;
title('Gaze Heatmap'); xlabel('Horizontal Position'); ylabel('Vertical Position');
axis equal;
set(gca, 'YDir', 'normal'); % Flip the Y-axis to match the image coordinates

I hope this helps!