Method and apparatus for selecting an optimum error correction routine

• US 5,267,248 A
• Filed: 12/24/1990
• Issued: 11/30/1993
• Est. Priority Date: 12/24/1990
• Status: Expired due to Term

• Current Assignee: Eastman Kodak Company
• Original Assignee: Eastman Kodak Company
• Inventors: Reyner, Noel L.
• Primary Examiner(s): Nguyen, Hoa T.
• Application Number:
  US07/633,136
• Time in Patent Office: 1,072 Days
• Field of Search: 371/25.1, 371/30, 371/37.1, 371/40.1-40.4
• US Class Current: 714/736
• CPC Class Codes: H03M 13/03 Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
• CPC Class Codes: H04N 5/945 for signals recorded by pulse code modulation

Abstract

A method and apparatus for performing error correction is disclosed in which an optimum error correction algorithm to be applied to a digital data signal is selected based on a detected characteristic of the digital data signal. The selection of an optimum error correction algorithm based on a characteristic of the digital data signal insures maximum efficiency of the error correction process with a minimum impact on overall system throughput efficiency.

Claims

1. An electronic imaging apparatus including error correction comprising:

an electronic imaging device that generates image data when exposed to scene light, means for exposing the electronic imaging device to scene light, conversion means for converting the image data generated by the electronic imaging device to digital image data;

compression processing means for compressing the digital image data;

means for recording the compressed digital image data on a storage disk;

reproduction means for reproducing the compressed digital image data from the storage disk;

detection means for detecting an error characteristic of the reproduced compressed digital image data and generating a detection signal indicative thereof;

error correction means for receiving the reproduced compressed digital image data from the reproduction means and correcting errors in the reproduced compressed digital image data in response to the detection signal generated by the detection means; and

decompression processing means for decompressing the reproduced compressed digital image data;

wherein the error correction means includes a memory unit and selects an optimum error correction algorithm from a plurality of error correction algorithms loaded in the memory unit in response to the detection signal and wherein the error correction means applies the optimum error correction algorithm to the reproduced compressed digital image data in order to correct errors contained therein.

2. An electronic imaging apparatus as claimed in claim 1, wherein the detection means includes means for detecting a drop out rate of the digital data signal.

3. An electronic imaging apparatus including error correction comprising:

an electronic imaging device that generates image data when exposed to scene light, means for exposing the electronic imaging device t scene light, conversion means for converting the image data generated by the electronic imaging device to digital image data;

compression processing means for compressing the digital image data;

means for recording the compressed digital image data on a storage disk;

reproduction means for reproducing the compressed digital image data from the storage disk;

detection means for detecting an error characteristic of the reproduced compressed digital image data and generating a detection signal indicative thereof;

error correction means for receiving the reproduced compressed digital image data from the reproduction means and correcting errors in the reproduced compressed digital image data in response the detection signal generated by the detection means; and

decompression processing means for decompressing the reproduced compressed digital image data;

wherein the error correction means implements a multi-level error correction algorithm to correct the errors contained in the reproduced compressed digital image data and selects the number of levels of the multi-level error correction algorithm to be performed in response to the detection signal.