Communication apparatus and control method for communication apparatus

• US 8,223,834 B2
• Filed: 09/18/2007
• Issued: 07/17/2012
• Est. Priority Date: 10/31/2006
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Goto, Masataka, Murai, Shinya, Yamaguchi, Kensaku, Tanaka, Shingo, Nishibayashi, Yasuyuki, Kawazoe, Hiroshi, Minematsu, Mika
• Primary Examiner(s): HAN, CLEMENCE S
• Application Number:
  US11/902,012
• Publication Number:
  US 20080101477A1
• Time in Patent Office: 1,764 Days
• Field of Search: None
• US Class Current: 375/240.01
• CPC Class Codes: H04L 65/1104 Session initiation protocol [SIP]
• CPC Class Codes: H04L 65/612 for unicast
• CPC Class Codes: H04N 19/44 Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
• CPC Class Codes: H04N 19/61 in combination with predictive coding
• CPC Class Codes: H04N 21/43637 involving a wireless protocol, e.g. Bluetooth, RF or wireless LAN [IEEE 802.11] arrangements for wireless networking or broadcasting of information in indoor or near-field type systems H04B10/114
• CPC Class Codes: H04N 21/4621 Controlling the complexity of the content stream or additional data, e.g. lowering the resolution or bit-rate of the video stream for a mobile client with a small screen arrangements for using the results of monitoring on user's side in broadcast systems H04H60/65; flow control in packet networks H04L47/10
• CPC Class Codes: H04N 21/6437 Real-time Transport Protocol [RTP]

Abstract

A signaling unit of a display terminal establishes communication with a content server, video communication terminal, and PC server through a communication unit, and transmits/receives image data compressed by MPEG2, MPEG4, and JPEG. A media control unit switches compression schemes for decoding in a media processing unit on the basis of the received image data. The media processing unit performs decoding processing including inverse orthogonal transformation processing and dequantization processing in accordance with the switched compression scheme. At this time, a single processing circuit performs inverse orthogonal transformation processing and dequantization processing.

Claims

1. A communication apparatus for decoding and displaying image data received by wireless communication, comprising:

a display unit to display image data;

a communication establishing unit configured to establish wireless communication with each of a computer which transmits application window data generated by executing an application program, a communication terminal which transmits video image data for video communication, and a content server which transmits content data containing a moving image;

a reception unit configured to receive the application window data, the video image data, and the content data from the computer, the communication terminal, and the content server, respectively, after wireless communication has been established by the communication establishing unit;

a generating unit configured to generate display image data to be displayed on the display unit by decoding the received application window data, the received video image data, and the received content data in correspondence with compression schemes of the respective data; and

a control unit configured to switch decoding schemes in the generating unit in correspondence with the compression schemes of the application window data, the video image data, and the content data,

wherein each of the application window data, the video image data, and the content data has been coded by using a compression scheme including orthogonal transformation processing of transforming two-dimensional image data into image data in a spatial frequency domain and quantization processing for the image data having undergone the orthogonal transformation processing, and

the generating unit implements inverse orthogonal transformation processing and dequantization processing for decoding the application window data, the video image data, and the content data by a single processing circuit.

2. The apparatus according to claim 1, wherein the compression schemes of the application window data, the video image data, and the content data are JPEG, MPEG4, and MPEG2, respectively.

3. A control method for a communication apparatus which decodes and displays image data received by wireless communication, comprising:

establishing wireless communication with each of a computer which transmits application window data generated by executing an application program, a communication terminal which transmits video image data for video communication, and a content server which transmits content data containing a moving image;

receiving the application window data, the video image data, and the content data from the computer, the communication terminal, and the content server, respectively, after wireless communication has been established;

decoding the received application window data, the received video image data, and the received content data in correspondence with compression schemes of the respective data;

generating display image data from the decoded image data; and

displaying the generated display image data,

wherein each of the application window data, the video image data, and the content data has been coded by using a compression scheme including orthogonal transformation processing of transforming two-dimensional image data into image data in a spatial frequency domain and quantization processing for the image data having undergone the orthogonal transformation processing, and inverse orthogonal transformation processing and dequantization processing for decoding the application window data, the video image data, and the content data are executed by a single processing circuit.

4. A non-transitory computer readable storage medium storing instructions of a computer program for decoding and displaying image data received by wireless communication, which when executed by a computer results in performance of steps comprising:

establishing wireless communication with each of a computer which transmits application window data generated by executing an application program, a communication terminal which transmits video image data for video communication, and a content server which transmits content data containing a moving image;

receiving the application window data, the video image data, and the content data from the computer, the communication terminal, and the content server, respectively, after wireless communication has been established;

decoding the received application window data, the received video image data, and the received content data in correspondence with compression schemes of the respective data;

generating display image data from the decoded image data; and

displaying the generated display image data,

wherein each of the application window data, the video image data, and the content data has been coded by using a compression scheme including orthogonal transformation processing of transforming two-dimensional image data into image data in a spatial frequency domain and quantization processing for the image data having undergone the orthogonal transformation processing, and inverse orthogonal transformation processing and dequantization processing for decoding the application window data, the video image data, and the content data are executed by a single processing circuit.