Slice layer in video codec

Abstract

A video encoder / decoder utilizes a bistream syntax that provides an independently decodable, partial picture unit, which may be in the form of a unit containing one or more contiguous rows of macroblocks (called a slice). This slice layer provides a flexible combination of error-resilience and compression efficiency. The slice layer encodes an efficient addressing mechanism (e.g., a syntax element specifying a beginning macroblock row of the slice layer), as well as an efficient mechanism to optionally retransmit picture header information. The slice layer provides decoding and reconstruction independence by disabling all forms of prediction, overlap and loop-filtering across slice-boundaries. This permits a slice coded in intra-mode to be reconstructed error-free, irrespective of errors in other regions of the picture.

Description

technical field [0001] The present invention relates to techniques for digitally encoding, decoding, and processing video, images, and other digital media content. Background technique [0002] Digital video consumes large amounts of storage and transmission capacity. A typical raw digital video sequence consists of 15 or 30 frames per second. Each frame can include tens or hundreds of thousands of pixels (also called pels). Each pixel represents a small element of a picture. In raw form, computers typically represent pixels as sets of three samples totaling 24 bits. For example, a pixel may include an 8-bit luminance sample (also known as a luma sample) defining the grayscale component of the pixel, and two 8-bit chroma sample values ​​(also known as chroma samples) defining the color component of the pixel. Thus, a typical raw video sequence may have a bits per second or bit rate of 5 million bits / second or more. [0003] Many computers and computer networks lack the ...

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Problems solved by technology

Furthermore, this introduces additional redundancy in the compressed video bitstream, which increases resilience to transmission errors and packet loss

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