Input sequence: take pictures (at 30 f/s) on a static color chart under variable illumination condition.
Output plot: pick a pixel on each color square, and plot its color proportion and brightness along time. 24 plots below correspond respectively to 24 squares in the chart.
Legend: The color lines represent color proportions and the black line represents a re-scaled brightness, i.e., [ 0, 3*255 ] -> [ 0, 1].
Remark
- In some bright colors like 'white', there is a clipping on brightness. (See the square 5 and 6)
- Color proportions are distorted by illumination changes more in bright colors than in darker ones.
- It would be good to see the plots of the weighted color deviations from the nearest codeword.
