Browsing NTNU Open by Author "Khan, Haris Ahmad"

Now showing items 1-10 of 10

    • Analytical Survey of Highlight Detection in Color and Spectral Images 

      Khan, Haris Ahmad; Thomas, Jean-Baptiste; Hardeberg, Jon Yngve (Chapter, 2017)
      Detection of highlights is a prominent issue in computer vision, graphics and image processing. Applications which require object properties measurement or rendering are affected by specular reflection since the models ...

    • HyTexiLa: high resolution visible and near infrared hyperspectral texture images 

      Khan, Haris Ahmad; Mihoubi, Soufiane; Mathon, Benjamin; Thomas, Jean-Baptiste; Hardeberg, Jon Yngve (Journal article; Peer reviewed, 2018)
      We present a dataset of close range hyperspectral images of materials that span the visible and near infrared spectrums: HyTexiLa (Hyperspectral Texture images acquired in Laboratory). The data is intended to provide high ...

    • Illuminant estimation in multispectral imaging 

      Khan, Haris Ahmad; Thomas, Jean-Baptiste; Hardeberg, Jon Yngve; Laligant, Olivier (Journal article; Peer reviewed, 2017)
      With the advancement in sensor technology, the use of multispectral imaging is gaining wide popularity for computer vision applications. Multispectral imaging is used to achieve better discrimination between the radiance ...

    • Multispectral camera as spatio-spectrophotometer under uncontrolled illumination 

      Khan, Haris Ahmad; Thomas, Jean-Baptiste; Hardeberg, Jon Yngve; Laligant, Olivier (Journal article; Peer reviewed, 2019)
      Multispectral constancy enables the illuminant invariant representation of multi-spectral data. This article proposes an experimental investigation of multispectral constancy through the use of multispectral camera as a ...

    • Multispectral Constancy Based on Spectral Adaptation Transform 

      Khan, Haris Ahmad; Thomas, Jean-Baptiste; Hardeberg, Jon Yngve (Chapter, 2017)
      The spectral reflectance of an object surface provides valuable information about its characteristics. Reflectance reconstruction from multispectral images is based on certain assumptions. One of these assumptions is that ...

    • Multispectral constancy for illuminant invariant representation of multispectral images 

      Khan, Haris Ahmad (Doctoral theses at NTNU;2018:290, Doctoral thesis, 2018)

    • Perovskite Color Detectors: Approaching the Efficiency Limit 

      Hossain, Mohammad Ismail; Khan, Haris Ahmad; Kozawa, Masayuki; Qarony, Wayesh; Salleo, Alberto; Hardeberg, Jon Yngve; Fujiwara, Hiroyuki; Tsang, Yuen Hong; Knipp, Dietmar (Peer reviewed; Journal article, 2020)
      Color image sensing by a smartphone or digital camera employs sensor elements with an array of color filters for capturing basic blue, green, and red color information. However, the normalized optical efficiency of such ...

    • Spectral Adaptation Transform for Multispectral Constancy 

      Khan, Haris Ahmad; Thomas, Jean-Baptiste; Hardeberg, Jon Yngve; Laligant, Olivier (Journal article; Peer reviewed, 2018)
      The spectral reflectance of an object surface provides valuable information of its characteristics. Reflectance reconstruction from multispectral image data is typically based on certain assumptions. One of the common ...

    • Towards highlight based illuminant estimation in multispectral images 

      Khan, Haris Ahmad; Thomas, Jean-Baptiste; Hardeberg, Jon Yngve (Journal article; Peer reviewed, 2018)
      We review the physics based illuminant estimation methods, which extract information from highlights in images. Such highlights are caused by specular reflection from the surface of dielectric materials, and according to ...

    • Vertically Stacked Perovskite Detectors for Color Sensing and Color Vision 

      Qarony, Wayesh; Kozawa, Masayuki; Khan, Haris Ahmad; Hossain, Mohammad Ismail; Salleo, Alberto; Tsang, Yuen Hong; Hardeberg, Jon Yngve; Fujiwara, Hiroyuki; Knipp, Dietmar (Peer reviewed; Journal article, 2020)
      Optical color sensors based on perovskites are described. These sensors overcome the limits of conventional image sensors used in smartphones and digital cameras. The sensors allow for detecting the primary colors red, ...