Picture Quality Editing for Variable Rate Compressed Video

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Publisher: SMPTE — White Plains, NY
Doc Type: Conference Paper
Content Type: Original Research
Volume: 1996, No. 15, pp. 1–17
Abstract: This paper discusses a novel video encoding system in which a user controls the quality of the encoded video. It uses an algorithm for re-allocation of target bits to the segment selected for editing or quality change. The algorithm is based on the availability of a log file containing statistics pertaining to the original run that produced the compressed video. A key aspect of the bit allocation is that subjective input from the user is used to alter the picture quality of the edit segment. Bitstream splicing is carried out to complete the process of edit. The video is initially encoded according to an automatic process without user intervention. An operator then reviews it manually, and indicates that the quality of specific time periods or regions that is to be altered. A numeric value for picture quality is assigned in the range [−5, 5]. First, a common bit pool is created by removing a percentage of bits from the time periods or regions for which quality priorities have been specified. These are then redistributed as a function of the user selected priority. The bit assignments are adjusted such that buffer under-flow condition is avoided. Also, the buffer occupancy at the trailing edge of the edit segment is maintained at its original level. After the assignment of new target bits, the average quantizer scale value is determined using a previously determined rate quantizer function. The video is then re-encoded with the new set of target bits to achieve the desired quality change. Bitstream and log files are updated by proper splicing.
Publication Date: 1996-10-01
DOI: 10.5594/M00131
Link: https://doi.org/10.5594/M00131
Author(s): Jay YogeshwarToshiba Advanced Television Technology Center Princeton, NJ, USA.
Mikhail TsinbergToshiba Advanced Television Technology Center Princeton, NJ, USA.
Copyright: © 1996 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

[1] ISO/IEC JTC1 CD 13818. Generic Coding of Moving Pictures and Associated Audio . International Organization for Standardization (ISO) , 1994 . EXTERNAL
[2] Koto Odaka , Toshiba R&D Center, Kawasaki, Private exchange . EXTERNAL

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Jay Yogeshwar and Mikhail Tsinberg; Picture Quality Editing for Variable Rate Compressed Video, SMPTE Meetings and Conferences ( October 1996); SMPTE, 1996. Available at https://doi.org/10.5594/M00131

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Jay Yogeshwar and Mikhail Tsinberg; Picture Quality Editing for Variable Rate Compressed Video, SMPTE Meetings and Conferences ( October 1996); SMPTE, 1996. Available at https://doi.org/10.5594/M00131

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<span class="citation">Jay Yogeshwar and Mikhail Tsinberg; <cite>Picture Quality Editing for Variable Rate Compressed Video</cite>, SMPTE Meetings and Conferences ( October 1996); SMPTE, 1996. Available at <a href="https://doi.org/10.5594/M00131" target="_blank" rel="noopener">https://doi.org/10.5594/M00131</a></span>

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Jay Yogeshwar and Mikhail Tsinberg; Picture Quality Editing for Variable Rate Compressed Video, SMPTE Meetings and Conferences ( October 1996); SMPTE, 1996
doi: 10.5594/M00131
url: https://doi.org/10.5594/M00131

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<li>
Jay Yogeshwar and Mikhail Tsinberg; <cite id="bib-10-5594-m00131">Picture Quality Editing for Variable Rate Compressed Video</cite>, SMPTE Meetings and Conferences ( October 1996); SMPTE, 1996
<span class="doi">10.5594/M00131</span>
</li>