Contrast Preserving Decolorization

Cewu Lu              Li Xu              Jiaya Jia

Color Image CIE Y Decolorized Image
(Chrominance contrast is preserved)


Decolorization - the process to transform a color image to a grayscale one - is a basic tool in digital printing, stylized black-and-white photography, and in many single channel image processing applications.

We propose an optimization approach aiming at maximally preserving the original color contrast. Our main contribution is to alleviate a strict order constraint for color mapping based on human vision system, which enables the employment of a bimodal distribution to constrain spatial pixel difference and allows for automatic selection of suitable gray scale in order to preserve the original contrast.


Snapshot for paper "Contrast Preserving Decolorization"
Cewu Lu, Li Xu, Jiaya Jia
IEEE International Conference on Computational Photography (ICCP), 2012

   [Paper (pdf, 4.9MB)]

  Code included in OpenCV since version 3.0

  [Image Data and Results (zip, 5.5M)]

  [Presentation Slides]

Snapshot for paper "Contrast Preserving Decolorization with Perception-Based Quality Metrics"
Cewu Lu, Li Xu, Jiaya Jia
International Journal of Computer Vision (IJCV), 2014

   [Paper (pdf, 5MB)]

  [Metric Code (CCPR, CCFR and E-score)]

  [COLOR250 Dataset (181MB)]

Related Projects

Examples and Comparison

Color Image CIE Y Decolorized Image
(Chrominance contrast is preserved)