ESR3 – Dipanjana Saha

Dipanjana Saha

Country of Origin: India
Host Institution: CNAM


Dipanjana completed her bachelor's in Electronics from Calcutta University in 2012. Later she pursued a Master's in technology (specializing in Optics and Optoelectronics) from Calcutta University in 2017. Her research interests are Optical metrology, microscopy & spectroscopy, biomedical imaging, and digital holography.

Aspirations within projects:

Dipanjana's main aspiration is to identify how the visual system works to differentiate a real object from an artificial one. This research will give information through developments of BRDF models of different surfaces to conduct to these confident and strong diagnostics. This is the objective of her PhD, to bring the community elements to give this information. And finally, a categorization based on results from measurements and models will be done, to understand the optical difference between natural and artificial materials.
This project will help her to learn the measurement and reproduction of the Appearance, advanced study of specular peaks of natural and artificial surfaces which will give her an opportunity to learn about visualization. She will use one of the most advances gonio-spectrophotometer in the world to perform BRDF measurements of natural and artificial surfaces based on our literature study. She will measure the roughness of artefacts which will be accessed from a collection of rough-meters available at CNAM. And these measurement data will be used to develop BRDF models that allow extracting parameters that are characteristics of the naturals and artificial surfaces. Which will help to reveal the fact why human visual system can differentiate a plastic made fruit from a natural one. Apart from this she will learn 3D and 2.5D printing technology and photometry, to detect and reproduce the material surface texture and evaluate the feasibility of different methods for material appearance reproduction in different unconventional fields.

ESR3: Advanced study of specular peaks of glossy surfaces

Main Supervisor:



The naturalness of a material is often acquired through its gloss. The main objective is to identify, based on a metrological study of the specular
reflection, the main difference between natural and artificial surfaces, though:

  • Collect a minimum of 15 representatives natural and artificial glossy surfaces selected according to a literature study and the production coming from the consortium.
  • Acquire the BRDF and the roughness of artifacts from:
    • Using a selected set of metrological set-up with the objective to achieve an angular resolution at least equivalent to the human visual system (<0.03°).
    • Exploit the data to develop new BRDF models that will render the complexity of the specular peak with the same resolution of the human visual system.
    • Develop a categorization based on results from (2) and (3) to understand the optical difference between natural and artificial materials.