Apparatus for block-selected encoding of a digital video signal

• US 8,315,468 B1
• Filed: 10/13/2010
• Issued: 11/20/2012
• Est. Priority Date: 07/28/2005
• Status: Active Grant

• Current Assignee: Teradici Corporation (HP Inc.)
• Original Assignee: Teradici Corporation (HP Inc.)
• Inventors: Hobbs, David Victor, Ratto, Patrick
• Primary Examiner(s): Alavi, Amir
• Application Number:
  US12/925,056
• Time in Patent Office: 769 Days
• Field of Search: 382/232, 382/233, 375/240.01, 375/240.12, 375/240.16, 375/240.24, 375/240.27, 375/E7.264, 345/2.1, 345/3.1, 345/329, 341/63, 341/65, 341/106, 709/247, 709/250, 713/171, 714/E11.173
• US Class Current: 382/232
• CPC Class Codes: H04N 19/12 Selection from among a plurality of transforms or standards, e.g. selection between discrete cosine transform [DCT] and sub-band transform or selection between H.263 and H.264
• CPC Class Codes: H04N 19/124 Quantisation
• CPC Class Codes: H04N 19/149 by estimating the code amount by means of a model, e.g. mathematical model or statistical model
• CPC Class Codes: H04N 19/166 concerning the amount of transmission errors, e.g. bit error rate [BER]
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• CPC Class Codes: H04N 19/196 being specially adapted for the computation of encoding parameters, e.g. by averaging previously computed encoding parameters processing of motion vectors H04N19/513
• CPC Class Codes: H04N 19/34 Scalability techniques involving progressive bit-plane based encoding of the enhancement layer, e.g. fine granular scalability [FGS]
• CPC Class Codes: H04N 19/507 using conditional replenishment

Abstract

An image encoding apparatus. In one embodiment, the apparatus comprises an encoding engine coupled to a source of a block of pixel data, the encoding engine enabled to encode the block of pixel data to a quality level, the encoding engine coupled to a network interface; and a state sequencer, the state sequencer enabled to obtain an indication of scan block persistence, build state information and encoding parameters to control the quality level.

Claims

1. An image encoding apparatus, comprising:

an encoding engine coupled to a source of an image frame comprising a plurality of blocks of pixel data, the encoding engine enabled to encode each of selected blocks of the plurality of blocks of pixel data to a block-selected quality level, the encoding engine coupled to a network interface; and

a state sequencer, the state sequencer enabled to obtain block-specific indications of persistence, block-specific progressive build state and encoding parameters to determine the selected blocks and the block-selected quality level for each of the selected blocks.

2. The image encoding apparatus of claim 1, wherein the state sequencer is enabled to update a table containing the block-specific progressive build state of each of the selected blocks.

3. The image encoding apparatus of claim 1, wherein the block-specific indications of persistence identify changed and unchanged blocks of the plurality of blocks of pixel data, wherein the changed and unchanged blocks are relative to a previous image frame from the source of the image frame.

4. The image encoding apparatus of claim 1, wherein the block-selected quality level is determined by at least one of an initial quality level, an encoding quality increment or encoded quality information of a previously encoded image frame from the source.

5. The image encoding apparatus of claim 1, wherein the encoding engine is enabled to perform block-selected progressive image encoding.

6. The image encoding apparatus of claim 1 wherein the encoding engine is enabled to perform a plurality of encoding methods, the plurality of encoding methods comprising non-transformed encoding methods, on blocks of pixels.