Statistical Analysis and Directional Coding of Layer-based HDR Image Coding Residue

Feyiz, Kutan
Kamışlı, Fatih
Zerman, Emin
Valenzise, Giuseppe
Koz, Alper
Dufaux, Frederic
Existing methods for layer-based backward compatible high dynamic range (HDR) image and video coding mostly focus on the rate-distortion optimization of base layer while neglecting the encoding of the residue signal in the enhancement layer. Although some recent studies handle residue coding by designing function based fixed global mapping curves for 8-bit conversion and exploiting standard codecs on the resulting 8-bit images, they do not take the local characteristics of residue blocks into account. Inspired by the local anisotropic characteristics of the residue signal and directional methods for motion compensated low dynamic range (LDR) video coding, in this paper we first investigate whether HDR image coding residue exhibits also local anisotropic characteristics. Specifically, we verify directional structures in residue blocks by means of auto-covariance analysis for different bitrates, spatial activities and dynamic ranges as the main variables in HDR image coding. Then, we compare the rate distortion performances of directional coding methods with the baseline residue coding methods in the literature along with different combinations of 8-bit conversion methods. The experiments indicate that content dependent 8-bit conversions and directional coding significantly outperforms the existing function based 8-bit conversions and typical coding for residue coding.


Statistical Analysis of Residue Signal for Backward Compatible HDR Image Coding
Kamışlı, Fatih; Koz, Alper; Zerman, Emin; Valenzise, Giuseppe; Dufaux, Frederic (2017-07-29)
Backward compatibility to the existing 8-bit displays for HDR image and video compression is an essential requirement for the wide acceptance of HDR technology by the users. While these previous methods mainly focus on the rate-distortion optimization of base layer, the encoding of the residue in the enhancement layer comparatively has received less attention. In this paper, we investigate whether HDR image coding residue exhibits also local anisotropic characteristics or not as in the case of motion compen...
Error analysis and testing of DRM for frame cameras
Bettemir, Oe. H.; Karslıoğlu, Mahmut Onur; Friedrich, J. (2007-06-16)
A new Differential Rectification Method (DRM) for frame cameras is proposed by Karslioglu and Friedrich [1] for the generation of orthoimages from monoscopic digital images which map every pixel onto a curved surface of reference frame i.e. WGS84. The ellipsoidal geodetic coordinates, of each pixel are calculated directly under the condition that a precise enough elevation model is available avoiding additional earth curvature corrections after the rectification. In this paper, convergence of the differenti...
Image dynamic range enhancement
Özyürek, Serkan; Akar, Gözde; Department of Electrical and Electronics Engineering (2011)
In this thesis, image dynamic range enhancement methods are studied in order to solve the problem of representing high dynamic range scenes with low dynamic range images. For this purpose, two main image dynamic range enhancement methods, which are high dynamic range imaging and exposure fusion, are studied. More detailed analysis of exposure fusion algorithms are carried out because the whole enhancement process in the exposure fusion is performed in low dynamic range, and they do not need any prior inform...
Visibility of dct quantization noise for high dynamic range images.
Sözer, Sevim Begü; Akyüz, Ahmet Oğuz; Department of Computer Engineering (2019)
Discrete cosine transform (DCT) is one of the fundamental stages, which is widely used and studied in lossy image compression. This technique aims to generate a minimum visible distortion in an image with respect to human visual system (HVS). The studies until now propose DCT quantization matrices for low dynamic range (LDR) images to display on LDR monitors. In this thesis research, the visibility of DCT quantization noise is studied for high dynamic range (HDR) images. High luminance patterns for DCT quan...
Recursive shortest spanning tree algorithms for image segmentation
Bayramoglu, NY; Bazlamaçcı, Cüneyt Fehmi (2005-11-24)
Image segmentation has an important role in image processing and the speed of the segmentation algorithm may become a drawback for some applications. This study analyzes the run time performances of some variations of the Recursive Shortest Spanning Tree Algorithm (RSST) and proposes simple but effective modifications on these algorithms to improve their speeds. In addition, the effect of link weight cost function on the run time performance and the segmentation quality is examined. For further improvement ...
Citation Formats
K. Feyiz, F. Kamışlı, E. Zerman, G. Valenzise, A. Koz, and F. Dufaux, “Statistical Analysis and Directional Coding of Layer-based HDR Image Coding Residue,” 2017, Accessed: 00, 2020. [Online]. Available: