Dzung T Hoang

US Patent:

6847405, Jan 25, 2005

Filed:

Sep 14, 2001

Appl. No.:

09/953465

Inventors:

Chi-Yuan Hsu - San Jose CA, US
Dzung Tien Hoang - San Jose CA, US

Assignee:

Sony Corporation - Tokyo
Sony Electronics, Inc. - Park Ridge NJ

International Classification:

H04N 1100

US Classification:

348452, 348700

Abstract:

One embodiment of the present invention provides a method and system for transforming a video bitstream in an interlaced format into a progressive format which can be displayed by a digital television. For example, the present embodiment utilizes the pixel information of a current field, previous field, and future field of the interlaced video bitstream to try to determine what the original content is of the missing lines of the current field. Specifically, the present embodiment utilizes different sets of pixel information in order to estimate the amount of motion that exist within a video bitstream. In this manner, the present embodiment is able to more closely determine the original value of the missing pixels of each field of the interlaced video bitstream. Therefore, the present embodiment provides a de-interlacing function enabling digital televisions to receive interlaced video bitstreams and display them in the progressive format.

US Patent:

7257162, Aug 14, 2007

Filed:

Jun 19, 2003

Appl. No.:

10/600163

Inventors:

Eric Viscito - San Francisco CA, US
Dzung T. Hoang - San Jose CA, US

Assignee:

Conexant Systems, Inc. - Newport Beach CA

International Classification:

H04N 7/12

US Classification:

37524025, 375240, 37524001, 37524012

Abstract:

One method for analyzing a bitstream having a plurality of compressed pictures comprises computing an initial arrival time and a final arrival time of a compressed picture, wherein the initial arrival time is equal to an earlier of the final arrival time of the immediately previous compressed picture or equal to a sum of a fixed time plus a sum of removal delays of all of the compressed pictures between the first compressed picture following the buffering period message and the compressed picture, including the compressed picture, and wherein the final arrival time is equal a sum of the initial arrival time and a time calculated based on the number of bits associated with the compressed picture at the bit rate; and verifying that a difference between the final removal time and the initial arrival time does not exceed the time for reaching the buffer size at the bit rate.

US Patent:

7532670, May 12, 2009

Filed:

Sep 5, 2003

Appl. No.:

10/655698

Inventors:

Eric Viscito - San Francisco CA, US
Dzung T. Hoang - San Jose CA, US

Assignee:

Conexant Systems, Inc. - Newport Beach CA

International Classification:

H04N 7/12

US Classification:

37524025, 375240, 37524001, 37524012

Abstract:

In one aspect, a method for encoding pictures is provided. The method is applied to each picture in a sequence of pictures, and the method comprises the steps of assigning a pre-decoder buffer removal time to the picture; selecting, for the picture, a number of bits, wherein the time-equivalent of the number of bits is no greater than a difference based on the pre-decoder buffer removal time of the picture and an initial arrival time of the picture into a pre-decoder buffer; and compressing the picture to generate the number of bits. The method may further include the step of allocating a first number of bits for compressing the picture and one or more number of bits for compressing one or more future pictures, wherein the future pictures are in the pre-decoder buffer at the pre-decoder buffer removal time of the current picture.

US Patent:

8064517, Nov 22, 2011

Filed:

Sep 7, 2007

Appl. No.:

11/852199

Inventors:

Eric Viscito - Saratoga CA, US
Dzung Hoang - Austin TX, US

Assignee:

Zenverge, Inc. - Cupertino CA

International Classification:

H04N 11/02
G06K 9/46
H04N 7/12

US Classification:

37524003, 382239, 382252

Abstract:

A system (and a method) are disclosed for adaptively selecting quantization parameter for each region of input video signal to be encoded within a video processing system. The system includes a frame partition module, an edge feature detector, a macroblock adaptive quantization energy (AQEnergy) evaluator and a macroblock adaptive quantization parameter selector. The frame partition module partitions a frame of an input video signal into smaller blocks of pixel data. The edge feature detector generates an edge direction histogram for each block to be encoded. The macroblock AQEnergy evaluator receives the edge direction histogram of the block, calculates the AQEnergy of the block and generates the adaptive quantization score (AQScore) of the macroblock. The macroblock adaptive quantization parameter selector selects an appropriate macroblock quantization parameter corresponding to the macroblock AQScore by a combination of programmable scaling and threshold logic.

US Patent:

8160153, Apr 17, 2012

Filed:

Mar 31, 2009

Appl. No.:

12/384180

Inventors:

Eric Viscito - San Francisco CA, US
Dzung T. Hoang - San Jose CA, US

Assignee:

Conexant Systems, Inc. - Newport Beach CA

International Classification:

H04N 7/12

US Classification:

37524025, 37524001, 37524012

Abstract:

In one aspect, a method for encoding pictures is provided. The method is applied to each picture in a sequence of pictures, and the method comprises the steps of assigning a pre-decoder buffer removal time to the picture; selecting, for the picture, a number of bits, wherein the time-equivalent of the number of bits is no greater than a difference based on the pre-decoder buffer removal time of the picture and an initial arrival time of the picture into a pre-decoder buffer; and compressing the picture to generate the number of bits. The method may further include the step of allocating a first number of bits for compressing the picture and one or more number of bits for compressing one or more future pictures, wherein the future pictures are in the pre-decoder buffer at the pre-decoder buffer removal time of the current picture.

US Patent:

8199820, Jun 12, 2012

Filed:

Jan 28, 2009

Appl. No.:

12/361440

Inventors:

Anthony D. Masterson - Saratoga CA, US
Dzung Tien Hoang - Austin TX, US

Assignee:

Zenverge, Inc. - Santa Clara CA

International Classification:

H04N 7/12
G01R 31/08

US Classification:

37524012, 37524003, 370232

Abstract:

A system (and a method) for compressing reference frames in a video transcoder. A transcoder receives a compressed input stream in a first compressed format and output a compressed output stream in a second compressed format. A decoder and an encoder in the transcoder use compressed reference frames. The reference frames are compressed by transforming a block of pixels from a spatial domain to a frequency domain to generate a coefficient array. The coefficient array is quantized and encoded to compress the size of the coefficients array to the size of a fixed bucket. The values of the entropy coded and quantized array are stored in a memory for use in decoding and/or encoding.

US Patent:

8311114, Nov 13, 2012

Filed:

Dec 6, 2006

Appl. No.:

11/567678

Inventors:

Anthony D. Masterson - Saratoga CA, US
Dzung T. Hoang - Austin TX, US
Alexander N. Kipnis - Mountain View CA, US

Assignee:

Zenverge, Inc. - Santa Clara CA

International Classification:

H04N 7/36

US Classification:

37524016, 37524012

Abstract:

Systems and methods for a streamlined transcoder architecture. A transcoder system includes an encoder and a decoder. The encoder compares a decoded frame and a encoder reference frame to produce an output stream. The decoder produces the decoded frame including decoder reference frame and the encoder reference frame. The decoded frame is produced from an input stream, and the encoder reference frame is produced from the output stream of the encoder. In one embodiment, the encoder refines motion vectors, quantization, and macroblock type/mode from the input stream for reuse in the output stream. Furthermore, the decoded frames from the input stream can be modified in various ways including changing picture resolution and performing image enhancement on them before encoding.

US Patent:

8351510, Jan 8, 2013

Filed:

Jan 29, 2009

Appl. No.:

12/362436

Inventors:

Anthony D. Masterson - Saratoga CA, US
Alexander N. Kipnis - Mountain View CA, US
Dzung Tien Hoang - Austin TX, US

Assignee:

Zenverge, Inc. - Santa Clara CA

International Classification:

H04N 7/12
G06K 9/36

US Classification:

37524016, 382236

Abstract:

An apparatus and method for generating predictors performs motion estimation of a target macroblock in a target field against data segments in reference fields. The same motion estimation engine is used to perform various image processing operations to efficiently use resources of the apparatus. Different reference fields are used depending on modes of operation. In a deinterlacing mode, deinterlacing is performed using directional interpolation, recursive motion compensated deinterlacing, and motion adaptive deinterlacing.