Method and system for progressive rate adaptation for uncompressed video communication in wireless systems

Patent metadata

Field	Value
Publication number	US-9369759-B2
Application number	US-75452210-A
Country	US
Kind code	B2
Filing date	Apr 5, 2010
Priority date	Apr 15, 2009
Publication date	Jun 14, 2016
Grant date	Jun 14, 2016

Abstract

Uncompressed video information is transmitted over a wireless communication medium from a wireless sender device to a wireless receiver device. Progressive transmission data rate adaptation is performed on original uncompressed video pixel information. The progressive transmission data rate adaptation is performed on selected pixel information to obtain a rate-reduced pixel information. The rate-reduced pixel information requires a lower transmission data rate than the original frame. The rate-reduced pixel information is transmitted over the wireless communication medium to the wireless receiver device. At the receiver, a reverse operation is performed to recover the original uncompressed video pixel information.

First claim

What is claimed is:

1. A method of transmitting video information over a wireless communication medium, comprising:
in a wireless sender device, obtaining original pixel information of uncompressed video pixels;
performing successive progressive transmission data rate adaptation operations on selected pixels utilizing pixel differential transformation to obtain rate-reduced pixel information based on performing a pixel differential transformation mode on pixels of selected pairs of reference pixels and target pixels in a block of selected pixels, wherein the pixel differential transformation mode comprises performing a pixel differential operation based on determining pixel differential information between current pixel information of a reference pixel and current pixel information of a target pixel and replacing the current pixel information of the target pixel with the pixel differential information as the rate-reduced pixel information, each determined pixel differential information is used in a successive progression for a further pixel differential operation where the target pixel is used as a next reference pixel for a next pixel differential operation, and the rate-reduced pixel information requires a lower transmission data rate than the original pixel information; and
transmitting the rate-reduced pixel information over the wireless communication medium.

2. The method of claim 1 , wherein:
performing successive progressive transmission data rate adaptation operations comprises performing iterative pixel differential operations to determine target pixel difference values; and
previously determined difference values in one pixel differential transformation mode are used to determine further difference values in a next pixel differential transformation mode.

3. The method of claim 2 , wherein:
performing successive progressive transmission data rate adaptation operations further comprises performing successive pixel differential transformation modes, such that each pixel differential transformation mode further reduces transmission data rate of selected pixel information as compared to a previous pixel differential transformation mode.

4. The method of claim 1 , wherein:
the wireless sender device transmits the rate-reduced pixel information instead of the original pixel information.

5. The method of claim 4 , wherein:
a block size is selected based on the differential transformation mode; and
each target pixel position is selected to reduce the overall average dependence length from an initial pixel to the target pixels in the block of selected pixels.

6. The method of claim 5 , wherein:
each target pixel position is selected to reduce maximum dependence length from the initial pixel to the target pixels.

7. The method of claim 6 , wherein:
the pixels in each block are positioned in rows and columns;
a first pixel differential transformation mode comprises performing row-wise pixel differential operations on selected pixel pairs positioned in rows; and
a subsequent pixel differential transformation mode comprises performing column-wise pixel differential operations on selected pixel pairs positioned in columns.

8. The method of claim 7 , further comprising:
partitioning spatially correlated pixels in each block into different partitions;
compressing the pixel differential information in each partition to compress the pixel information in each partition;
placing pixel information from partitions into packets; and
transmitting each packet over the wireless communication medium.

9. The method of claim 4 , wherein:
performing successive progressive transmission data rate adaptation operations further comprises performing successive pixel dropping modes after performing one or more pixel differential transformation modes, such that each pixel dropping mode further reduces transmission data rate of the pixel information by discarding pixels in the block of selected pixels.

10. The method of claim 9 , wherein:
performing each pixel dropping mode comprises performing a pixel discarding operation,
selected pixels at different locations in a block are evenly discarded, and
the pixels with maximum dependence length from an initial pixel in the block are discarded first.

11. The method of claim 4 , wherein the pixel information comprises color element information.

12. The method of claim 8 , further comprising:
at a wireless receiver device, receiving the rate-reduced pixel information;
determining original pixel values from the rate-reduced pixel information by regressive data rate adaptation in reverse order of the successive progressive transmission data rate adaptation at the sender device; and
reconstructing the uncompressed video pixel information from the spatially correlated pixels.

13. The method of claim 12 , further comprising:
identifying a corrupt pixel by checking if received pixel information for a pixel is missing; and
recovering missing pixel information using received pixel information of pixels that are spatially correlated with the corrupt pixel.

14. The method of claim 2 , wherein:
performing successive progressive transmission data rate adaptation operations comprises performing successive pixel dropping modes, such that each pixel dropping mode further reduces transmission data rate of the pixel information.

15. The method of claim 14 , wherein:
performing each pixel dropping mode comprises performing a pixel discarding operation, and selected pixels at different locations in a block are evenly discarded.

16. The method of claim 15 , wherein performing each pixel discarding operation comprises:
discarding a selected pixel in a rectangular block of pixels, wherein the block size is selected based on the pixel dropping mode, such that a pixel is selected to be discarded based on distance of the pixel to a reference pixel in the block.

17. The method of claim 16 , wherein the selected pixel to be discarded has the longest distance from an initial pixel in the block, such that the pixels with maximum dependence length from an initial pixel in the block are discarded first.

18. A wireless station for transmitting video information over a wireless communication medium, comprising:
a rate adaptation interface configured to perform successive progressive transmission data rate adaptation operations on selected pixels of original pixel information for uncompressed video pixels utilizing pixel differential transformation to generate rate-reduced pixel information based on a pixel differential transformation mode performed on pixel information of selected pairs of reference and target pixels in a block of selected pixels, wherein the pixel differential transformation mode determines pixel differential information between current pixel information of a reference pixel and current pixel information of a target pixel and replaces the current pixel information of the target pixel with the pixel differential information as the rate-reduced pixel information, each successive determination of pixel differential information is used for a further pixel differential operation where the target pixel is used as a next reference pixel for a next pixel differential operation, and the rate-reduced pixel information requires a lower transmission data rate than the original pixel information; and
a communication interface configured to transmit the rate-reduced pixel information over the wireless communication medium.

19. The wireless station of claim 18 , wherein:
the rate adaptation interface is

Assignees

• Shao Huai-Rong
• Hsu Ju-Lan
• Ngo Chiu
• Samsung Electronics Co Ltd

Inventors

• Shao Huai-Rong
• Hsu Ju-Lan
• Ngo Chiu

Classifications

• H04N7/125

  the signal segment being a picture element · CPC title

• H04N21/4126

  The peripheral being portable, e.g. PDAs or mobile phones · CPC title

• H04N7/012

  Conversion between an interlaced and a progressive signal (for graphics images G09G2310/0229) · CPC title

• H04N19/428

  Recompression, e.g. by spatial or temporal decimation · CPC title

• H03M7/3044

  Conversion to or from differential modulation with several bits only, i.e. the difference between successive samples being coded by more than one bit, e.g. differential pulse code modulation [DPCM] (H03M7/3004 takes precedence; voice coding G10L19/00; image coding H04N19/00) · CPC title