MATLAB: How to calculate eye area and height

areaeyesheightImage Processing Toolboxskin

I've attached 2 images, one with open eyes and another one with close eyes. How to calculate the eyes area and height ? so I can compare the height values between open and close eyes, then detect when the eyes are close. As if the eyes height value is big it indicate that eyes are open and vice versa.

Best Answer

You can use the Color Thresholder app on the Apps tab of the MATLAB tool ribbon to look for skin tones, then invert that mask and get the eyes mask. Then use regionprops() to get the bounding box. But what are you going to do if the woman is wearing eye shadow so that her eyes are dark (non-skin tone) regardless of whether her eyes are open or closed. See attached skin detection demo.

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To get the overall bounding box:

bbox = [
  1174  557  63  66
  1692  1517  74  78
  1157  467  69  73
  1123  1447  72  77
  887  1572  77  82
  1586  1275  93  100
  1589  1517  89  95
  706  1300  115  122
  540  1309  122  130
  496  1718  1262  1342]
% Find the xRight columns
xRight = bbox(:, 1) + bbox(:, 3)
% Find the yBottom rows
yBottom = bbox(:, 2) + bbox(:, 4)
% Find the overall left-most x value
xLeft = min(bbox(:, 1))
% Find the overall right-most x value

xRight = max(xRight)
% Find the overall top-most y value
yTop = min(bbox(:, 2))
% Find the overall right-most x value
yBottom = max(yBottom)
% Get the overall bounding box
overallBox = [xLeft, yTop, xRight-xLeft, yBottom-yTop]
% Plot the individual boxes
for row = 1 : size(bbox, 1)
  rectangle('Position', bbox(row, :), 'EdgeColor', 'b', 'LineWidth', 2);
  hold on;
end
% Plot the overall bounding box in red.
rectangle('Position', overallBox, 'EdgeColor', 'r', 'LineStyle', '--', 'LineWidth', 2);
axis equal
xlim([0,2000]);
ylim([0,3500]);

Best Answer

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