Browsing by Author "Liu, Yu-Lun"

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Background Modeling Using Depth Information
(2014)
Liu, Yu-Lun
;
Hang, Hsueh-Ming
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
This paper mainly focuses on creating a global background model of a video sequence using the depth maps together with the RGB pictures. The first key concept is the near objects block the scenes at the back. With the aid of depth information, we can identify the closer moving objects. Secondly, we develop a recursive algorithm that iterates between the depth map and color pictures. Comparing to the existing schemes, our proposed method can produce better quality background images and it improves the background depth map at the same time.
Virtual View Synthesis Using Backward Depth Warping Algorithm
(2013-01-01)
Li, Du-Hsiu
;
Hang, Hsueh-Ming
;
Liu, Yu-Lun
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
The virtual view synthesis reference software offered by the MPEG standard committee adopts the forward warping technique in projecting the depth map from the reference view to the target (virtual) view location. Often, this warping process results in many artifacts, holes and cracks, due to quantization errors and occlusion. In this study, we propose a backward warping process to replace the forward warping process, and the artifacts (particularly the ones produced by quantization) are significantly reduced. The subjective quality of the synthesized virtual view images is thus much improved.