Xingbo Wang defended his thesis

Xingbo Wang has defended his thesis titled “Filter array based spectral imaging: demosaicking and design considerations” on 10 October at the Faculty of Computer Science and Media Technology (AIMT), NTNU in Gjøvik.

Spectral imaging refers to the process of capturing pictorial information across the colour spectrum, resulting in spectral images that contain significant information beyond what is found in conventional colour images. Spectral imaging apparatus in current use, however, are often cumbersome, costly and slow in operation, which becomes a major obstacle to extensive use of spectral imaging in diverse applications such as science, industry, art, defence, etc.

– The opportunity to take spectral images is important in several fields because the images contain more information than conventional colour images, Wang says.

It can for example be used in aerial depictions of forest to easily determine wood types based on colour shades of the foliage.

– For consumer market purposes there are still some challenges, but for special-interest groups that benefit from working with spectral images we see promising opportunities for easier and more accessible technology, Wang says.

Wang’s approach to spectral imaging is based on a single imaging chip with an extended colour filter array. The technology is currently used to filter red, green and blue to create regular colour images in digital cameras. Wang has looked at methods for extending the method to include more colours in the spectrum allowing spectral imaging apparatus akin to today's digital cameras or even camera phones in terms of size, weight, cost and ease of operation.

Wang has constructed a simulation framework which enabled the development of key system components and new image processing algorithms among others. He has pointed to significant challenges that exist in the field and given further recommendations.

Xingbo Wang carried out his doctoral training in cooperation with Faculty of Computer Science and Media Technology, NTNU in Gjøvik and University of Bourgogne, École Doctorale SPIM - Sciences Pour l’Ingénieuret Microtechniques. (cotutelle agreement).

His main supervisors were Professor Jon Yngve Hardeberg, NTNU in Gjøvik and Professor Pierre Gouton, University of Bourgogne. His co-supervisor was Associate Professor Jean-Baptiste Thomas, University of Bourgogne.

Assessment committee

  • First External opponent: Professor Markku Hauta-Kasari, University of Eastern Finland
  • Second External opponent: Professor Ludovic Macaire, University Lille 1, France
  • Internal opponent and administrator of the committee’s work: Associate Professor Simon McCallum, Faculty of Computer Science and Media Technology NTNU in Gjøvik


Head of Section Terje Stafseng, conducted the public defense.


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