TENSOR-PRODUCT B-SPLINE PREDICTION FOR HDR VIDEO IN MOBILE APPLICATIONS

TENSOR-PRODUCT B-SPLINE PREDICTION FOR HDR VIDEO IN MOBILE APPLICATIONS

Tensor-Product B-splines (TPB) have been shown to improve video quality when used to represent reshaping functions to map reshaped standard dynamic range content into high dynamic range (HDR) content; however, TPB prediction is computationally intensive and may not be supported by legacy devices. Me...

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Bibliographische Detailangaben
Hauptverfasser: SU, Guan-Ming, GANAPATHY KATHIRVELU, Hariharan, QU, Sheng, KADU, Harshad, KLITTMARK, Per Jonas Andreas
Format: Patent
Sprache:eng
Schlagworte:
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PICTORIAL COMMUNICATION, e.g. TELEVISION
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Zusammenfassung:Tensor-Product B-splines (TPB) have been shown to improve video quality when used to represent reshaping functions to map reshaped standard dynamic range content into high dynamic range (HDR) content; however, TPB prediction is computationally intensive and may not be supported by legacy devices. Methods and systems for backwards-compatible signaling of TPB-related metadata and a fast TPB prediction method are presented to overcome both of these limitations. Computation overhead for a TPB-based 3D look-up table is reduced by using temporary two-dimensional arrays. A remapping of the most significant bits of a legacy bit-depth parameter allows for backwards compatibility.