APPARATUS FOR DECODING COMPRESSED IMAGES

• US 20050018913A1
• Filed: 07/23/2004
• Published: 01/27/2005
• Est. Priority Date: 07/24/2003
• Status: Abandoned Application

• Current Assignee: Lite-On It Corporation (Lite-On Technology Corporation)
• Original Assignee: Lite-On It Corporation (Lite-On Technology Corporation)
• Inventors: Chen, Jin-Jou, Chuang, Hsin-Jung, Tsao, Sheng-Hung, Chien, Ming-Hsiu
• Application Number:
  US10/710,595
• Publication Number:
  US 20050018913A1
• Time in Patent Office: Days
• US Class Current: 382/233
• CPC Class Codes: H04N 19/42 characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation H04N19/635 takes precedence
• CPC Class Codes: H04N 19/44 Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder

Abstract

An apparatus for decoding compressed images is disclosed. A compressed file decoder is added in the apparatus for decreasing the load on a CPU and increasing the speed of decoding a compressed file. Furthermore, a pipeline structure is used in designing the elements of the compressed file decoder. Therefore, after a compressed file is received by the compressed file decoder, each of the elements of the compressed file decoder sequentially executes to decode the compressed file to generate a corresponding decoded image data. Hence, when displaying the image corresponding to the compressed file, the quality of image display on a TV screen can be substantially improved, and the situation in which image display idles or delays will occur less.

Claims

1. An image decoding apparatus utilized for decoding a compressed file, comprising:

a central processing unit (CPU) which receives a compressed file;

a compressed file decoder which receives the compressed file outputted from the CPU, generates a decoded image data and encodes the decoded image data to generate a digital video signal;

a frame buffer connected to the compressed file decoder for storing the decoded image data; and

an analog video encoder which receives the digital video signal and converts the digital video signal into a TV signal.

2. The image decoding apparatus of claim 1, wherein the compressed file decoder provides an operation mode through which the decoded image data is transmitted back to the CPU.

3. The image decoding apparatus of claim 1, wherein the compressed file decoder provides an operation mode through which the CPU accesses the frame buffer.

4. The image decoding apparatus of claim 1, wherein the compressed file is a JPEG file.

5. The image decoding apparatus of claim 1, wherein the TV signal conforms to the NTSC standard.

6. The image decoding apparatus of claim 1, wherein the TV signal conforms to the PAL standard.

7. The image decoding apparatus of claim 1, wherein the compressed file decoder comprises:

a decoder core utilized for receiving the compressed file and producing a frame composed of a plurality of minimum coded units for the compressed file;

an adjusting operation unit utilized for selecting a shown range in the frame, applying a resize operation or a rotation operation on the shown range, and then converting the shown range on which the resize operation or the rotation operation has been performed into the decoded image data; and

a digital video encoder utilized for reading the decoded image data stored in the frame buffer and encoding the decoded image data to generate the digital video signal.

8. The image decoding apparatus of claim 7, wherein the adjusting operation unit comprises:

a crop unit utilized for selecting the shown range in the frame; and

a resize unit utilized for applying a resize operation or a rotation operation on the shown range and generating the decoded image data.

9. The image decoding apparatus of claim 7, wherein the decoder core is a JPEC decoder core.

10. The image decoding apparatus of claim 7, wherein the digital video encoder is an ITU-R656 digital video encoder.

11. An image decoding apparatus utilized for decoding a compressed file, comprising:

a decoder core utilized for receiving a compressed file and producing a frame composed of a plurality of minimum coded units for the compressed file;

an adjusting operation unit utilized for selecting a shown range in the frame, applying a resize operation or a rotation operation on the shown range, and then converting the shown range on which the resize operation or the rotation operation has been performed into a decoded image data;

a frame buffer utilized for storing the decoded image data; and

a digital video encoder utilized for reading the decoded image data stored in the frame buffer and encoding the decoded image data to generate a digital video signal.

12. The image decoding apparatus of claim 11, wherein the adjusting operation unit comprises:

a crop unit utilized for selecting the shown range in the frame; and

a resize unit utilized for applying a resize operation or a rotation operation on the shown range and generating the decoded image data.

13. The image decoding apparatus of claim 11 further comprising a CPU utilized for receiving the compressed file and transmitting the compressed file to the decoder core.

14. The image decoding apparatus of claim 11 further comprising an analog video encoder utilized for receiving the digital video signal and converting the digital video signal into a TV signal.

15. The image decoding apparatus of claim 14, wherein the TV signal conforms to the NTSC standard.

16. The image decoding apparatus of claim 14, wherein the TV signal conforms to the PAL standard.

17. The image decoding apparatus of claim 11, wherein the decoder core is a JPEC decoder core.

18. The image decoding apparatus of claim 11, wherein the digital video encoder is an ITU-R656 digital video encoder.