Method for detecting pattern of over-sampling image and an optical information processing apparatus and method using the same

• US 7,933,187 B2
• Filed: 12/29/2008
• Issued: 04/26/2011
• Est. Priority Date: 12/27/2007
• Status: Expired due to Fees

• Current Assignee: Taiwan Semiconductor Manufacturing Company Limited
• Original Assignee: Dongbu Daewoo Electronics Corporation (Dayou Holdings Co.,Ltd.)
• Inventors: Kim, Nak Young, Yoon, Pil Sang, Jung, Kyu Il
• Primary Examiner(s): Agustin, Peter Vincent
• Application Number:
  US12/344,929
• Publication Number:
  US 20090168630A1
• Time in Patent Office: 848 Days
• Field of Search: None
• US Class Current: 369/103
• CPC Class Codes: G11B 7/0065 Recording, reproducing or erasing by using optical interference patterns, e.g. holograms

Abstract

Provided are a method for detecting a pattern of an over-sampling image and an optical information processing apparatus and method using the same. A method for detecting a pattern from an image of an over-sampled datapage includes: over-sampling the datapage to detect a detection image of the datapage; comparing the detection image and a reference image of over-sampling for the pattern by a covariance; and calculating a pixel of the pattern over-sampled by values of the reference image and the detection image compared by the covariance. Accordingly, data with a specific pattern such as a mark can be detected from an image of an over-sampled datapage, thereby making it possible to increase the data reproduction accuracy, thus making it possible to greatly increase the reliability of reproduced optical data.

Claims

1. A method for detecting a pattern from an image of an over-sampled datapage, comprising:

detecting a detection image of the datapage by over-sampling the datapage;

comparing the detection image with a reference image by a covariance, the reference image is an image of over-sampling for the pattern by a covariance; and

,

calculating a pixel of the pattern over-sampled by values of the reference image and the detection image compared by the covariance.

2. The method of claim 1, wherein a step of comparing the detection image with the reference image performs the covariance on the basis of a center pixel of the detection image detected with respect to the over-sampling reference image for the pattern.

3. The method of claim 1, wherein the value of the reference image and the detection image compared by the covariance is calculated by the following equation;

4. The method of claim 1, wherein the value of the reference image and the detection image compared by the covariance is calculated by the following equation;

5. An optical information processing method for detecting an image of a datapage by over-sampling the datapage, comprising:

detecting a detection image of the datapage by over-sampling the datapage,

detecting a mark of the detection image from the detection image by using a covariance;

demodulating the detection image on the basis of the detected mark; and

generating output data by decoding the demodulated detection image.

6. The optical information processing method of claim 5, wherein the step of detecting the mark comprises:

comparing the detection image with a reference image by a covariance, wherein the reference image is an image of over-sampling for the pattern by a covariance; and

calculating a pixel of the mark over-sampled by values of the reference image and the detection image compared by the covariance.

7. The optical information processing method of claim 6, wherein the step of comparing the detection image with the reference image performs the covariance on the basis of a center pixel of the detection image detected with respect to the over-sampling reference image for the mark.

8. The optical information processing method of claim 6, wherein the value of the reference image and the detection image compared by the covariance is calculated by the following equation:

9. The optical information processing method of claim 6, wherein the value of the reference image and the detection image compared by the covariance is calculated by the following equation:

10. An optical information processing apparatus comprising:

a light source;

a beam splitter for splitting a beam emitted from the light source into a reference beam and a signal beam;

a spatial light modulator for loading data into the signal beam;

an input data processing unit for encoding the data, modulating the encoded data by modulation code conversion to generate a datapage carrying a mark, and providing the generated datapage to the spatial light modulator;

a detector for over-sampling and detecting the datapage from a reproducing beam reproduced in a recording medium by the reference beam; and

an output data processing unit for comparing and calculating a mark of the datapage image detected by the detector, and the reference image for the mark, by a covariance, and generating output data by demodulating and decoding the detection image using the mark as a reference position.

11. The optical information processing apparatus of claim 10, wherein the output data processing unit performs the covariance on the basis of a center pixel of the mark in the detection image over-sampled and detected by the detector with respect to the reference image.

12. The optical information processing apparatus of claim 10, wherein the output data processing unit calculates the covariance for the respective pixels of the detection image and the reference image by the following equation:

13. The optical information processing apparatus of claim 10, wherein the output data processing unit calculates the covariance of the detection image and the reference image by the following equation:

14. An optical information processing apparatus comprising:

a light source for emitting a beam for reproduction of a datapage;

a detector for over-sampling and detecting the datapage from a reproducing beam reproduced in a recording medium by the beam; and

an output data processing unit for comparing and calculating a mark of the datapage image detected by the detector and the reference image for the mark by a covariance, and generating output data by demodulating and decoding the detection image using the mark as a reference position.

15. The optical information processing apparatus of claim 14, wherein the output data processing unit performs the covariance on the basis of a center pixel of the mark in the detection image over-sampled and detected by the detector with respect to the reference image.

16. The optical information processing apparatus of claim 14, wherein the output data processing unit calculates the covariance for the respective pixels of the detection image and the reference image by the following equation:

17. The optical information processing apparatus of claim 14, wherein the output data processing unit calculates the covariance of the detection image and the reference image by the following equation: