Video MP3 system with apparatus and method for generating and restoring reduced video data

• US 7,433,410 B2
• Filed: 10/04/2001
• Issued: 10/07/2008
• Est. Priority Date: 10/05/2000
• Status: Expired due to Fees

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Yu, Han-ju, Yoon, Seok-joong
• Primary Examiner(s): Rao; Andy S
• Application Number:
  US09/971,299
• Publication Number:
  US 20020057743A1
• Time in Patent Office: 2,560 Days
• Field of Search: 3752401-24029
• US Class Current: 375/240.25
• CPC Class Codes: H04N 19/428 Recompression, e.g. by spatial or temporal decimation
• CPC Class Codes: H04N 19/59 involving spatial sub-sampling or interpolation, e.g. alteration of picture size or resolution
• CPC Class Codes: H04N 19/61 in combination with predictive coding

Abstract

A video MP3 system including an audio/video (AV) decoder which further comprises a video decoder for restoring a moving picture signal in a MP3 player for restoring an audio signal, an apparatus and method for generating reduced video data which are appropriate for use in the video MP3 system, and an apparatus and method for restoring the reduced video data are provided. In the apparatus for generating reduced video data operated by a method for generating reduced video data, a video stream compressed according to rules of a MPEG is divided into a motion vector, a discrete cosine transform (DCT) DC coefficient, a DCT AC coefficient, and reduced video data, which are appropriate for use in the video MP3 system, are generated by using the motion vector, the discrete cosine transform (DCT) DC coefficient, and the DCT AC coefficient. In the apparatus for restoring reduced video data operated by a method for restoring reduced video data, an intra-frame is over-sampled by using a discrete cosine transform (DCT) DC coefficient and a DCT AC coefficient, and restored to a picture signal, and an inter-frame is motion compensated by using the motion vector and restored to a picture signal.

Claims

1. An apparatus for generating display-compatible video data, the apparatus comprising:

a variable length code decoder (VLD) for receiving a moving picture experts group (MPEG) video stream and decoding motion displacements and discrete cosine transform (DCT) data of the received MPEG video stream to output a motion vector, a quantization scale, and a quantization coefficient;

an inverse quantizer (IQ) for receiving the quantization scale and the quantization coefficient and performing inverse quantization of the received quantization scale and quantization coefficient to output DCT coefficients; and

a multiplexer for multiplexing the motion vector, and the DCT coefficients, to generate display-compatible video data.

13. The apparatus as claimed in claim 1, wherein the display- compatible video data is compatible for display on a portable device.

14. The apparatus as claimed in claim 13 wherein the portable device is an MP3 device.

2. A method for generating display-compatible video data, the method comprising:

receiving an MPEG video stream, decoding motion displacements and discrete cosine transform (DCT) data of the received MPEG video stream to generate a motion vector, a quantization scale, and a quantization coefficient;

receiving the quantization scale and the quantization coefficient and performing inverse quantization of the received quantization scale and quantization coefficient to generate DCT coefficients; and

multiplexing the motion vector and the DCT coefficients to generate display-compatible video data.

15. The method as claimed in claim 2, wherein the display-compatible video data is compatible for display on a portable device.

16. The method as claimed in claim 15, wherein the portable device is an MP3 device.

3. A video MP3 system comprising:

a portable enclosure, the contents of which comprise;

a micro-computer capable of controlling data processing steps and other components;

a memory device coupled to and controlled by the micro-computer, the memory device comprising stored compressed audio data and display-compatible video data;

an audio/video (AV) decoder coupled to and controlled by the micro- computer;

an audio reproducer coupled to the audio/video decoder; and

a video reproducer coupled to the audio/video decoder,

wherein the AV decoder divides the display-compatible video data into a motion vector, a discrete cosine transform (DCT) DC coefficient, and a DCT AC coefficient, and generates restored video data based on the motion vector the DCT DC coefficient and the DCT AC coefficient.

4. The system as claimed in claim 3, further comprising a data interfacing unit coupled to and controlled by the micro-computer, the data interfacing unit comprising a connector for communicating audio and video data to or from an external source.

5. The system as claimed in claim 3, further comprising a key inputting unit coupled to the micro-computer.

6. The system as claimed in claim 5, further comprising a display unit coupled to the video reproducer and the micro-computer.

7. The system as claimed in claim 6, wherein the micro-computer processes key inputting unit signals into corresponding control display unit signals and sends the control display unit signals to the display unit.

8. The system as claimed in claim 7, wherein the micro-computer also sends control signals to the audio/video (AV) decoder to process display-compatible video data.

9. The system as claimed in claim 7, wherein the display unit is sized for a mobile phone.

10. The system as claimed in claim 3, wherein the audio/video (AV) decoder comprises:

an audio decoder; and

a video decoder, the video decoder comprising a de-multiplexer, an over- sampler coupled to the de-multiplexer, a motion compensator coupled to the de- multiplexer, and an adder coupled to the over-sampler and the motion compensator.

11. A method for presenting audio and visual data in a portable device, the method comprising:

storing compressed audio data and display-compatible video data in a memory device of the portable device;

transmitting the stored audio data and video data to an audio/video decoder in the portable device;

decoding the audio data to an audio signal; and

decoding the display-compatible video data to a video signal compatible with a display unit of the portable device,

wherein decoding the display-compatible video data to a video signal comprises dividing the display-compatible video data into a motion vector, a discrete cosine transform (DCT) DC coefficient, and a DCT AC coefficient, and generating restored video data based on the motion vector, the DCT DC coefficient and the DCT AC coefficient.

12. The method as claimed in claim 11, wherein the step of decoding the video data comprises:

receiving the stored video data from the memory device;

dividing the video data into discrete cosine transform (DCT) coefficients and a motion vector;

over-sampling an intra-frame using the DCT coefficients to provide an over- sampled signal;

motion compensating an inter-frame using the motion vector and a feedback loop of a final video signal to provide a motion compensated signal; and

adding the over-sampled signal and the motion compensated signal to generate the final video signal.