Data processing apparatus with adaptive compression algorithm selection based on visibility of compression artifacts for data communication over display interface and related data processing method

• US 9,514,705 B2
• Filed: 08/02/2013
• Issued: 12/06/2016
• Est. Priority Date: 10/09/2012
• Status: Active Grant

• Current Assignee: MediaTek, Inc.
• Original Assignee: MediaTek, Inc.
• Inventors: Ju, Chi-Cheng, Liu, Tsu-Ming
• Primary Examiner(s): Richer, Joni
• Application Number:
  US13/957,430
• Publication Number:
  US 20140098115A1
• Time in Patent Office: 1,222 Days
• Field of Search: 345/501, 345/520, 345/660
• US Class Current: 1/1
• CPC Class Codes: G06F 3/14 Digital output to display device ; Cooperation and interconnection of the display device with other functional units
• CPC Class Codes: G06T 1/20 Processor architectures; Processor configuration, e.g. pipelining
• CPC Class Codes: G06T 9/00 Image coding bandwidth or redundancy reduction for static pictures H04N1/41; coding or decoding of static colour picture signals H04N1/64; methods or arrangements for coding, decoding, compressing or decompressing digital video signals H04N19/00
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2340/02 Handling of images in compressed format, e.g. JPEG, MPEG
• CPC Class Codes: G09G 2340/04 Changes in size, position or resolution of an image
• CPC Class Codes: G09G 2350/00 Solving problems of bandwidth in display systems
• CPC Class Codes: G09G 2370/08 Details of image data interface between the display device controller and the data line driver circuit
• CPC Class Codes: G09G 2370/10 Use of a protocol of communication by packets in interfaces along the display data pipeline
• CPC Class Codes: G09G 5/005 Adapting incoming signals to the display format of the display terminal
• CPC Class Codes: G09G 5/006 Details of the interface to the display terminal specific for a display terminal using a CRT G09G1/167; using a flat panel G09G3/2096; circuits for interfacing with colour displays G09G5/04
• CPC Class Codes: H04N 19/10 using adaptive coding
• 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 19/136 Incoming video signal characteristics or properties
• CPC Class Codes: H04N 19/156 Availability of hardware or computational resources, e.g. encoding based on power-saving criteria
• CPC Class Codes: H04N 19/164 Feedback from the receiver or from the transmission channel
• CPC Class Codes: H04N 19/172 the region being a picture, frame or field

Abstract

A data processing apparatus has a compressor and an output interface. The compressor receives an input display data, and generates an output display data according to the input display data. The output interface packs the output display data into an output bitstream, and outputs the output bitstream via a display interface. The compressor adaptively adjusts a compression algorithm applied to the input display data according to visibility of compression artifacts. By way of example, the display interface may be a display serial interface (DSI) standardized by a Mobile Industry Processor Interface (MIPI) or an embedded display port (eDP) standardized by a Video Electronics Standards Association (VESA).

Claims

1. A data processing apparatus comprising:

a compressor, arranged for receiving an input display data and generating an output display data according to the input display data; and

an output interface, arranged for packing the output display data into an output bitstream, and outputting the output bitstream via a display interface;

wherein the compressor adaptively adjusts a compression algorithm applied to the input display data according to visibility of compression artifacts by referring to at least a pixel density of a display apparatus or referring to at least a distance between the display apparatus and a viewer of the display apparatus; and

wherein contents carried by the output display data transmitted via the display interface are displayed on the display apparatus, and the compressor adaptively adjusts the compression algorithm by referring to at least the pixel density of the display apparatus or at least the distance between the display apparatus and the viewer of the display apparatus, wherein when referring to at least the pixel density, the compressor is arranged to employ a first compression algorithm as the compression algorithm when the pixel density is higher than a first predetermined threshold, and employ a second compression algorithm as the compression algorithm when the pixel density is not higher than the first predetermined threshold, and when referring to at least the distance, the compressor is arranged to employ a third compression algorithm as the compression algorithm when the distance is smaller than a second predetermined threshold, and employ a fourth compression algorithm as the compression algorithm when the distance is not smaller than the second predetermined threshold, where the second compression algorithm is different from the first compression algorithm and the fourth compression algorithm is different from the third compression algorithm.

2. The data processing apparatus of claim 1, wherein the display interface is a display serial interface (DSI) standardized by a Mobile Industry Processor Interface (MIPI) or an embedded display port (eDP) standardized by a Video Electronics Standards Association (VESA).

3. The data processing apparatus of claim 1, wherein the second compression algorithm is more complex than the first compression algorithm.

4. The data processing apparatus of claim 1, wherein the compressor adaptively adjusts the compression algorithm by referring to at least a scaling factor associated with the input display data.

5. The data processing apparatus of claim 4, wherein the compressor is arranged to employ a fifth compression algorithm as the compression algorithm when the scaling factor is higher than a third predetermined threshold, and employ a sixth compression algorithm as the compression algorithm when the scaling factor is not higher than the third predetermined threshold, where the sixth compression algorithm is different from the fifth compression algorithm.

6. The data processing apparatus of claim 5, wherein when the scaling factor is a scaling-up factor, the fifth compression algorithm is more complex than the sixth compression algorithm;

and when the scaling factor is a scaling-down factor, the fifth compression algorithm is less complex than the sixth compression algorithm.

7. The data processing apparatus of claim 1, wherein the third compression algorithm is more complex than the fourth compression algorithm.

8. A data processing method comprising:

receiving an input display data;

adaptively adjusting a compression algorithm according to visibility of compression artifacts by referring to at least a pixel density of a display apparatus or referring to at least a distance between the display apparatus and a viewer of the display apparatus;

generating an output display data according to the compression algorithm and the input display data; and

packing the output display data into an output bitstream, and outputting the output bitstream via a display interface;

wherein contents carried by the output display data transmitted via the display interface are displayed on the display apparatus, and the step of adaptively adjusting the compression algorithm comprises;

referring to at least the pixel density of the display apparatus or referring to at least the distance between the display apparatus and the viewer of the display apparatus to adaptively adjust the compression algorithm;

wherein when the compression algorithm is adaptively adjusted by referring to at least the pixel density, the compression algorithm is set by a first compression algorithm when the pixel density is higher than a first predetermined threshold, and the compression algorithm is set by a second compression algorithm when the pixel density is not higher than the first predetermined threshold, and when the compression algorithm is adaptively adjusted by referring to at least the distance, the compression algorithm is set by a third compression algorithm when the distance is smaller than a second predetermined threshold, and the compression algorithm is set by a fourth compression algorithm when the distance is not smaller than the second predetermined threshold, where the second compression algorithm is different from the first compression algorithm and the fourth compression algorithm is different from the third compression algorithm.

9. The data processing method of claim 8, wherein the display interface is a display serial interface (DSI) standardized by a Mobile Industry Processor Interface (MIPI) or an embedded display port (eDP) standardized by a Video Electronics Standards Association (VESA).

10. The data processing method of claim 8, wherein the second compression algorithm is more complex than the first compression algorithm.

11. The data processing method of claim 8, wherein step of adaptively adjusting the compression algorithm comprises:

referring to at least a scaling factor associated with the input display data to adaptively adjust the compression algorithm.

12. The data processing method of claim 11, wherein the compression algorithm is set by a fifth compression algorithm when the scaling factor is higher than a third predetermined threshold, and the compression algorithm is set by a sixth compression algorithm when the scaling factor is not higher than the third predetermined threshold, where the sixth compression algorithm is different from the fifth compression algorithm.

13. The data processing method of claim 12, wherein when the scaling factor is a scaling-up factor, the fifth compression algorithm is more complex than the sixth compression algorithm;

and when the scaling factor is a scaling-down factor, the fifth compression algorithm is less complex than the sixth compression algorithm.

14. The data processing method of claim 8, wherein the third compression algorithm is more complex than the fourth compression algorithm.

15. A data processing apparatus comprising:

a compressor, arranged for receiving an input display data, and generating an output display data according to the input display data; and

an output interface, arranged for packing the output display data into an output bitstream, and outputting the output bitstream via a display interface to a second apparatus;

wherein the compressor adaptively adjusts a compression algorithm applied to the input display data according to visibility of compression artifacts by referring to at least a pixel density of a display apparatus, referring to at least a scaling factor associated with the input display data, or referring to at least a distance between the display apparatus and a viewer of the display apparatus; and

wherein the data processing apparatus and the second apparatus are located at different chips, respectively;

the compressor and the output interface are included in a first chip, the second apparatus is included in a second chip; and

the display interface is a chip-to-chip interface that provides direct pin connections between the first chip and the second chip.

16. A data processing method comprising:

receiving an input display data;

adaptively adjusting a compression algorithm according to visibility of compression artifacts by referring to at least a pixel density of a display apparatus, referring to at least a scaling factor associated with the input display data, or referring to at least a distance between the display apparatus and a viewer of the display apparatus;

generating an output display data according to the compression algorithm and the input display data in a first chip; and

packing the output display data into an output bitstream in the first chip, and outputting the output bitstream via a display interface to a second apparatus included in a second chip different from the first chip, wherein the display interface is a chip-to-chip interface that provides direct pin connections between the first chip and the second chip.