Frame-Accurate Video Cropping in Compressed MPEG Domain

Rehan, M.; Agathoklis, P.

doi:10.1109/pacrim.2007.4313301

Cited by 4 publications

(3 citation statements)

References 8 publications

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“…Rehan and Agathoklis describe a mechanism to support video cropping in the compressed MPEG domain [Rehan et al 2007]. Their focus is mainly on the reconstruction of video sequences taken from a larger sequence.…”

Section: Region-of-interest: Related Workmentioning

confidence: 99%

Supporting region-of-interest cropping through constrained compression

Feng

Dang

Kassebaum

et al. 2011

ACM Trans. Multimedia Comput. Commun. Appl.

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The ability to create super high-resolution video is becoming relative easy to do either through a single high-definition video camera or panoramic video that automatically stitches multiple views together. As an example of the former, the motion picture industry now has 6000 × 4000 pixel full-rate video cameras available. This means that supporting region-of-interest cropping will become more important in the future. In this article, we propose a mechanism to support region-of-interest adaptation of stored video. The proposed approach creates a compression-compliant stream (e.g., MPEG-2), while still allowing it to be cropped. Fortunately, video standards like MPEG-2 specify the format of a compliant stream, and not the algorithm to get there. As a result, there is an opportunity to allow system researchers and implementers ways to optimize for applications. We show various fundamental tradeoffs that are made in order to support region-of-interest cropping with super high-resolution video which we received from a local motion-picture firm.

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Section: Region-of-interest: Related Workmentioning

confidence: 99%

Supporting region-of-interest cropping through constrained compression

Feng

Dang

Kassebaum

et al. 2011

ACM Trans. Multimedia Comput. Commun. Appl.

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“…Techniques for cropping by limiting temporal dependency [13] within a compressed video was addressed by Rehan and Agathoklis. They proposed a technique where by the first frame in the cropped set is encoded into an I-frame, with all predicted frames re-encoded with the new I-frame as the reference.…”

Section: Related Workmentioning

confidence: 99%

Supporting zoomable video streams with dynamic region-of-interest cropping

Khiem

Ravindra

Carlier

et al. 2010

Proceedings of the First Annual ACM SIGMM Conference on Multimedia Systems

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Streaming of an arbitrary region of interest (RoI) from a high resolution video is essential to supporting zooming and panning within a video stream. This paper explores two methods for RoI-based streaming, referring to them as tiled streaming and monolithic streaming. Tiled streaming partitions video frames into grid of tiles and encodes each tile as an independently decodable stream. Monolithic streaming applies to video encoded using off-the-shelf encoder, and relies on a pre-computed dependency information to send the necessary bits for the RoI. We evaluated these two methods in terms of bandwidth efficiency, storage requirement, and computational costs under different video encoding parameters. Experimental results show that bandwidth efficiency of tiled streams for RoI-based streaming reduces when tile size increases, despite improvement in compression efficiency. In the case of monolithic streams, use of a larger motion vector range coupled with careful run-time optimization can still improve the bandwidth efficiency, despite an increase in motion vector dependency.

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“…In addition, a frame conversion method that prevents the loss of image continuity at the time of switching was developed [2], [3]. Later, an algorithm for preventing image distortion caused by frame conversion at the time of switching, and a method for minimizing the effect of switching on the video buffer verifier, were proposed [4], [5]. Nevertheless, these methods cannot avoid hindering the image quality.…”

Section: Introductionmentioning

confidence: 99%

Seamless Video Switching System for Service Compatible 3DTV Broadcasting

Kim¹,

Jeon²

2016

ETRI J

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Broadcasting services such as multi/single channel HDTV and 3DTV/2DTV use a multi‐channel encoder that changes the bitrate and composition of the video service depending on the time. However, this type of multi‐channel encoder could cause a longer latency owing to the variable bitrate and relatively bigger size of the buffers, which results in the same delay as in 3DTV even for a conventional DTV service. On the other hand, systems built based on separate encoders, each of which is optimized for the target service, might not have such latency problems. Nevertheless, there might be a distortion problem in the image and sound at the time of a switchover between two encoders with different output bitrates and group of picture structures. This paper proposes a system that can realize a seamless video service conversion using two different video encoders optimized for each video service. An overall functional description of the video service change control server, which is a main control block for the proposed system, is also provided. The experiment results confirm the seamless switchover and reduced broadcasting latency of DTV services compared with a broadcasting system composed of a multi‐channel encoder system.

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Frame-Accurate Video Cropping in Compressed MPEG Domain

Cited by 4 publications

References 8 publications

Supporting region-of-interest cropping through constrained compression

Supporting region-of-interest cropping through constrained compression

Supporting zoomable video streams with dynamic region-of-interest cropping

Seamless Video Switching System for Service Compatible 3DTV Broadcasting

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