Classifying Image Areas of a Video Signal
Inactive Publication Date: 2011-04-28
PIXONICS
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Benefits of technology
[0063]Any distinct pattern or set of attributes that can be derived from the base layer, through a combination of operations and analytical stages, and has commonality among a sufficient number of codevectors, can serve as a class. The larger the number of codevectors that share common attributes (such as the example base patterns
Problems solved by technology
However, each new incompatible approach would have displaced the installed base of receiving equipment, or required spectrum inefficient simulcasting.
However, unlike analog, no digital scalable scheme has been deployed in commercial practice, largely due to the difficulties and overheads created by the scalable digital signals.
However, the instantaneous coded bitrate of pictures varies significantly from one picture to another, so temporal scalable benefits of discrete streams is not provided by a single MPEG bitstream with B-pictures.
Also, there is no recognized registration authority for these embedded extensions, and thus collisions between users of such mechanisms can arise, and second that the supplementary data must be kept to a minimum data rate.
ATSC and DVD have made attempts to create unique bit patterns that essentially serve as the headers and identifiers of these extensions, and register the ID's, but it is not always possible to take a DVD bitstream and have it translate directly to an ATSC stream.
Without pre-filtering, a 4 mbps DVD movie would likely otherwise exhibit significant visible compression artifacts.
Prior art interpolation methods can interpolate a standard definition video signal to, for example, a high definition display, but do not add or restore content beyond the limitations of the standard-definition sampling lattice.
However such schemes are computationally expensive, non-linear, and do not always yield consistent quality gains frame-to-frame.
Such an increased bitrate would not fit onto modem DV
Method used
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OVERVIEW OF TOOLS
[0120]The PHD decoding process depicted in FIG. 4b has two fundamental stages of modem video coding. A first prediction phase 4130,1130 forms a first best estimate 4132,1135 of the target picture 4152,1175, using only the output state 4115,1115 of a base layer decoder 4110,1110 (and some minimal directives 4122), followed by a prediction error phase comprising classification 4140,1120, enhancement decode 4120,1150 and application 4150 of correction 1165 terms that improve the estimate.
[0121]The overall PHD enhancement scheme fits within the template of the classic spatial scalable enhancement architecture (FIG. 4a). The respective base layer decoders 4020,4110 are principally the same. Both fundamental enhancement phases may operate concurrently in the receiver, and their respective output 4126,4032 added together at a later, third phase 4150, where the combined signal 4152 is sent to display, and optionally stored 4160 for future reference 4172 in a frame buffer 4...
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A method of enhancing picture quality of a video signal is disclosed. The method comprises the steps of receiving base layer images of standard definition pictures from a base layer decoder; defining image areas of the standard definition pictures; classifying image areas into image types by assigning a class number; and generating enhanced pictures based upon the standard definition pictures and the classification of the image areas. A circuit for enhancing picture quality of a video signal is also disclosed. The circuit comprising a base layer decoder; a classifier coupled to the base layer decoder, the classifier generating a class number for image areas of a standard definition picture; a summing circuit coupled to the classifier; an exchange stream decoder coupled to the summing circuit, the exchange stream decoder generating an index; and a codebook table coupled to the summing circuit. The codebook table preferably stores a plurality of codevectors based upon the class number and the index.
Description
CLAIM FOR PRIORITY [0001]The present application is a continuation application of co-pending U.S. patent application Ser. No. 10 / 447,296, entitled “Classifying Image Areas of a Video Signal,” filed on May 28, 2003, in the name of inventors Diego Garrido, Richard Webb, Simon Butler, and Chad Fogg, which, in turn, claims the benefit of priority based on U.S. Provisional Patent Application Ser. No. 60 / 384,047, entitled “Video Interpolation Coding,” filed on May 29, 2002, in the name of inventors Diego Garrido, Richard Webb, Simon Butler, and Chad Fogg, all commonly owned herewith.RELATED APPLICATIONS [0002]This application relates to U.S. application Ser. No. 10 / 447,213, entitled VIDEO INTERPOLATION CODING, U.S. application Ser. No. 10 / 446,216, entitled MAINTAINING A PLURALITY OF CODEBOOKS RELATED TO A VIDEO SIGNAL, and U.S. application Ser. No. 10 / 446,347, entitled PREDICTIVE INTERPOLATION OF A VIDEO SIGNAL, each filed concurrently on May 28, 2003 by the inventors of the present inven...
Claims
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Login to View More IPC IPC(8): H04N7/01H04N7/26H04N7/46H04N7/50H04N19/94
CPCH04N7/0125H04N19/59H04N7/014H04N7/0145H04N9/8042H04N19/00733H04N19/176H04N19/70H04N19/46H04N19/51H04N19/30H04N19/149H04N19/15H04N19/61H04N19/117H04N19/124H04N19/126H04N19/14H04N19/177H04N19/44H04N19/80H04N19/82H04N19/527H04N19/85H04N19/86H04N19/94H04N7/0137
InventorGARRIDO, DIEGOWEBB, RICHARDBUTLER, SIMONFOGG, CHAD
OwnerPIXONICS