False color visualization for hdr images

Date

2013-04-10

Author

Akyüz, Ahmet Oğuz

Metadata

Show full item record

Item Usage Stats

103
views

0
downloads

Photographic visualization of high dynamic range (HDR) images on low dynamic range (LDR) displays, known as tone mapping, is a well-known problem. However, no well-defined method exist to visualize HDR images for the purpose of scene analysis and understanding. In this paper, we aim to fill this gap by first outlining a general framework that can be used to visualize HDR images using false (i.e. pseudo) colors based on pixel luminances. We then experiment with several simple false coloring functions that can be used within this framework, and evaluate their effectiveness through a small user study. Our results indicate that a tone mapping like false coloring function gives the best results in general. However, we also find that the performance of different false coloring methods depends on the dynamic range of the HDR image, and therefore different images may require different strategies for best results.

URI

http://ic1005-hdri.inesctec.pt/publications/HDRi_2013.pdf
https://hdl.handle.net/11511/81035
https://www.yumpu.com/en/document/read/24543084/false-color-visualization-for-hdr-images-indextr-metu-

Conference Name

HDRi2013 - First International Conference and SME Workshop on HDR imaging

Collections

Department of Computer Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

Privacy protection of tone-mapped HDR images using false colours ÇİFTÇİ, Serdar; Akyüz, Ahmet Oğuz; PİNHEİRO, Antonio M. G.; Ebrahimi, Touradj (2017-12-01) High dynamic range (HDR) imaging has been developed for improved visual representation by capturing a wide range of luminance values. Owing to its properties, HDR content might lead to a larger privacy intrusion, requiring new methods for privacy protection. Previously, false colours were proved to be effective for assuring privacy protection for low dynamic range (LDR) images. In this work, the reliability of false colours when used for privacy protection of HDR images represented by tone-mapping operators...
Automatic saturation correction for dynamic range management algorithms Artusi, Alessandro; POULİ, Tania; BANTERLE, Francesco; Akyüz, Ahmet Oğuz (2018-04-01) High dynamic range (HDR) images require tone reproduction to match the range of values to the capabilities of a display. For computational reasons and given the absence of fully calibrated imagery, rudimentary color reproduction is often added as a post-processing step rather than integrated into tone reproduction algorithms. In the general case, this currently requires manual parameter tuning, and can be automated only for some global tone reproduction operators by inferring parameters from the tone curve....
Directional coding of backward compatible high dynamic range (HDR) image coding residues Feyiz, Kutan; Kamışlı, Fatih; Department of Electrical and Electronics Engineering (2018) High dynamic range (HDR) image and video formats are proposed to overcome limitations of widely accepted standard 8-bit low dynamic range (LDR) image and video representations. The main aim of these formats is to encode the whole luminance range of real world scenes which changes from extreme darkness ( 10 − 6 cd/ m 2 ) to bright sunshine ( 10 8 cd/ m 2 ), and to generate and store such scenes independent from the display technology. To achieve a successful transition from LDR to HDR technology, backward ...
Accelerating Translational Image Registration for HDR Images on GPU Alpay, Kadir Cenk; Temizel, Alptekin (null; 2020-10-09) High Dynamic Range (HDR) images are generated using multiple exposures of a scene. When a hand-held camera is used to capture a static scene, these images need to be aligned by globally shifting each image in both dimensions. For a fast and robust alignment, the shift amount is commonly calculated using Median Threshold Bitmaps (MTB) and creating an image pyramid. In this study, we optimize these computations using a parallel processing approach utilizing GPU. Experimental evaluation shows that the proposed...
Evaluation of tone mapping and exposure fusion algorithms on HDR videos for face detection and recognition Çavdarlı, Fehime Betül; Akyüz, Ahmet Oğuz; Department of Computer Engineering (2022-2-08) High dynamic range (HDR) images have become popular recently especially for video surveillance systems. One of the most important reasons for this is that in areas where there is under or over-exposure, classical low dynamic range (LDR) images are insufficient to capture details, while HDR images have better visual details and contain wide range illumination values. However, since HDR images cannot be viewed on conventional LDR displays, additional processing such as tonemapping and/or fusion are required t...

Citation Formats

A. O. Akyüz, “False color visualization for hdr images,” Porto, Portekiz, 2013, p. 26, Accessed: 00, 2021. [Online]. Available: http://ic1005-hdri.inesctec.pt/publications/HDRi_2013.pdf.