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Computação Multimédia

Código 15645
Ano 1
Semestre S2
Créditos ECTS 6
Carga Horária PL(30H)/T(30H)
Área Científica Informática
Learning outcomes Explain limitations of current image representations.
Explain the difference between HDR image and LDR image.
Explain HDR image capture methods.
Know tone mapping operators for generating LDR images from HDR images.
Define the plenotic function.
Explain methods of capturing Light Fields.
Explain methods for creating holograms.
Explain how digital refocusing is processed.
Explain how to define different views.
Explain basic coding techniques.
Know the limits of human perception that affect the choices about digital representation.
Design an encoder for the new image modalities presented.
Know objective and subjective quality assessment methods.
Syllabus 1) Multimedia tecnology (Image and video coding)
2) Quality of Experience (subjective evaluation, objective measures)
3) HDR Technology
4) Plenoptic models
4.1. Light Fields
4.2. Point clouds
4.3. Digital holography
4.4. Nerfs
Teaching Methodologies and Assessment Criteria Learning activities are essentially based on theoretical and practical lectures.
Theoretical lectures essentially serve to expose the subject, that is, to analyze, evaluate and discuss the mainconcepts/data. The exposition of the concepts is always accompanied with presentation of examples and small exercises that allow to verify if the students are understanding the concepts and allows to take out some specific doubts that may arise.
The practical lectures serve to use the concepts acquired first with respect to the acquisition, representation and visualization of the different modalities of image and in a second time in the development or use of coding systems and quality assessment models. In these are carried out small exercises that the students will have to carry out with the accompaniment of the instructor.

The assessment is made through 4 projects (5 values each)
Main Bibliography R.M. Gray, "Entropy and Information Theory", Information Systems Laboratory, Stanford University, Springer-Verlag,1990.
F. Pereira, E. Silva, G. Lafruit, Image and Video Processing and Analysis and Computer Vision, 2018, Pages 75-111 -Chaper 2 - Plenoptic imaging: Representation and processing
M. Pereira, A. Pinheiro. JPEG XT verification tests by U.B.I., Covilha, Portugal. ISO/IEC JTC 1/SC 29/WG 1 N6590, (ITU-TSG16), Coding of Still Pictures, 2014.
A. Pinheiro, M. Pereira, T. Ebrahimi, Performance evaluation of JPEG XT image compression, 67th meeting of ISO/IECJTC 1/SC 29/WG 1, Strasbourg, France 2014-10-20 to 2014-10-24.
JPEG Pleno Holography - Draft Overview of Holography
Factors Influencing Quality of Experience. U. Reiter, K. Brunnström, K. De Moor, L. Mohamed-Chaker, M. Pereira, A.Pinheiro, J. You, A. Zgank. 01/2014: pages 45-60;
Qualinet White paper on Definitions of Quality of Experience. M. Pereira, A. Pinheiro, … EU COST action 1003QUALINET.
Language Portuguese. Tutorial support is available in English.
Data da última atualização: 2025-02-28
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