• Author: Gary Bradski
• Link: The feature request
• Status: Draft
• Platforms: All
• Complexity: 1-2 man-months

Color calibration is extensively used in film and for photometric needs, but OpenCV neglects this basic area. We need to create a couple of functions that will

• Find a MacBeth ColorChecker chart and its homography (robust please to someone holding its corners by hand)
• Return the colors
• Run a color adjustment algorithm on it

• Create a function that will robustly find common MacBeth charts (allowing for partial occlusion of hands holding the corners) and their homography
  • This one
  • and the standard one
• Rectify the chart and find each color value in order (detecting partial occlusion of say hands holding he corners)
• Apply a color correction algorithm
  • Linear correction matrix
  • More extensive list of linear and polynomial corrections

Overall, the external API will not change.

Many, you could find the chart and correct colors using a trained deepnet. It would be good to create the above functions and then maybe a toolbox app that ran them.

• Macbeth chart
  • Linear correction matrix
  • More extensive list of linear and polynomial corrections
  • Vinyl Macbeth Chart
  • Standard Macbeth chart

• Rectify the chart and find each color value in order (detecting partial occlusion of say hands holding he corners)