Colour and Multispectral Image Processing

 

People:

  • Adrian Evans
  • Gengqian Yang
  • David Gimenez

Background:

The rapidly-increasing availability of multi- and hyper-spectral satellite imagery, and low-cost colour digital cameras, has resulted in multi-channel image representations becoming far more prevalent. This presents many challenges to image processing and analysis as the extension of many greyscale techniques to more than one channel is not straightforward. This is particularly true for nonlinear techniques, for example the median filter and morphological operations, which are based on pixel ordering.

Projects:

  • Efficient single image dehazing algorithms for colour images (Masters student Gengqian Yang)
  • The development of morphological scale-spaces for colour images and their application to noise reduction and segmentation (PhD student David Gimenez).
  • Colour and multispectral edge detection.
  • Morphological operations based on novel vector ordering.

Publications:

  • Macfarlane, F., Murray, P., Marshall, S., Perret, B., Evans, A. and White, H., Robust Object Detection in Colour Images Using a Multivariate Percentage Occupancy Hit-or-Miss Transform, Mathematical Morphology - Theory and Applications, vol. 5, no. 1, 2021, pp. 128-152 https://doi.org/10.1515/mathm-2020-0111
  • Yang, G., Evans, A.N., Improved single image dehazing methods for resource-constrained platforms, Journal of Real-Time Image Processing, 18, 2511-2525 (2021). https://doi.org/10.1007/s11554-021-01143-6 Python code now available
  • A.N. Evans and D. Gimenez, Extending Connected Operators to Colour Images, in Proc. IEEE International Conference on Image Processing, pp. 2184-2187, October 2008. pdf
  • D. Gimenez and A.N. Evans, An Evaluation of Area Morphology Scale-Spaces for Colour Images, Computer Vision and Image Understanding, 110(1), pp. 32-42, 2008.
  • A.N. Evans, Nonlinear Edge Detection in Color Images in Advances On Nonlinear Signal and Image Processing, edited by Stephen Marshall and Giovanni L. Sicuranza, EURASIP Book Series on Signal Processing and Communications, vol. 6, pp. 329-356, 2006.
  • A.N. Evans and X.U. Liu, A Morphological Gradient Approach to Color Edge Detection, IEEE Transactions on Image Processing, 15(6), pp. 1454-1463, June 2006. pdf

Robust Colour Morphological Gradient code now available for the L2 norm and the combined distance metric.

·         D. Gimenez and A.N. Evans, Colour Morphological Scale-spaces from the Positional Colour Sieve, in Proc. Digital Image Computing: Techniques and Applications, Cairns, December 2005. pdf

·         A.N. Evans, Nonlinear Operations for Colour Images Based on Pairwise Vector Ordering, in Proc. Digital Image Computing: Techniques and Applications, Cairns, December 2005. pdf

·         D. Gimenez and A.N. Evans, Colour Morphological Scale-Spaces for Image Segmentation, in Proc. British Machine Vision Conference, Vol. 2, pp. 909-918, Oxford, September 2005. pdf

·         A.N. Evans, Morphological Gradient Operators for Colour Images, in Proc. IEEE International Conference on Image Processing, Vol. III, pp. 3089-3092, Singapore, October 2004. pdf

·         A.N. Evans, Extending area morphology to multivariate images, in Proc. 6th IEEE-EURASIP Workshop on Nonlinear Signal and Image Processing (NSIP 2003), Grado, Italy, June 2003. pdf