Method and apparatus for recording/reproducing mesh pattern data

• US 5,454,054 A
• Filed: 04/14/1992
• Issued: 09/26/1995
• Est. Priority Date: 06/09/1989
• Status: Expired due to Term

• Current Assignee: Intellectual Ventures Holding 56 LLC (Intellectual Ventures LLC)
• Original Assignee: Casio Computer Company Limited
• Inventors: Iizuka, Nobuo
• Primary Examiner(s): COUSO, YON JUNG
• Application Number:
  US07/869,012
• Time in Patent Office: 1,260 Days
• Field of Search: 382/65, 382/54, 382/7, 382/61, 382/57, 235/432, 235/436, 235/456, 235/437, 235/494, 235/462
• US Class Current: 382/321
• CPC Class Codes: G06K 19/06037 multi-dimensional coding
• CPC Class Codes: G06K 19/06075 the marking containing means for error correction
• CPC Class Codes: G06K 2019/06262 with target- or other orientation-indicating feature
• CPC Class Codes: G06K 7/016 Synchronisation of sensing process
• CPC Class Codes: G06K 7/1093 sensing, after transfer of the image of the data-field to an intermediate store, e.g. storage with cathode ray tube
• CPC Class Codes: G06K 7/1417 2D bar codes
• CPC Class Codes: G06K 7/1473 error correction
• CPC Class Codes: G06T 9/001 Model-based coding, e.g. wire frame

Abstract

Recorded data is read by an image sensor from a recording medium on which the data is two-dimensionally recorded in a mesh pattern, and the read data is stored in an image RAM. The stored data is subjected to data decoding and error correction to reproduce target data. A scanning reference pattern of a mesh pattern recorded on the recording medium serves as a guide when the stored recorded data read by the image sensor is reproduced by scanning in the image RAM. A reproduction apparatus has a capability of coping with a partial destruction of the scanning reference pattern. Error checking codes are added to the recording medium in addition to the target data. These items of data are recorded as an encoded image after being subjected to scrambling processing and randomization processing. The reproduction apparatus can easily cope with an error when the encoded image is reproduced.

Claims

1. A data reproduction method comprising the steps of:

reading an encoded image as image data from a recording medium on which image elements including dark and light image elements are arranged at two-dimensionally distributed positions whose arrangement includes a second predetermined order of a changed two-dimensional matrix obtained by changing a first predetermined order of an original two-dimensional matrix, said original two-dimensional matrix being formed by adding error checking codes to target data;

detecting image elements from the read image data, and obtaining elements of the data expressed by the image elements to form the second predetermined order of the changed two-dimensional matrix;

changing the order of the second predetermined order of the formed two-dimensional matrix to form the first predetermined order of the original two-dimensional matrix; and

correcting an error on the first predetermined order of the formed original two-dimensional matrix according to the error checking codes included in the formed first predetermined order of the original two-dimensional matrix to reproduce the target data.

2. A data reproduction apparatus comprising:

image sensor means for reading an encoded image as image data from a recording medium on which image elements including dark and light image elements are arranged at two-dimensionally distributed positions whose arrangement includes a second predetermined order of a scrambled two-dimensional matrix obtained by scrambling a first predetermined order of an original two-dimensional matrix, said original two-dimensional matrix being formed by adding error checking codes to target data;

image element decoding means for detecting image elements from the read image data, and obtaining the elements of the data expressed by the image elements to form the second predetermined order of the scrambled two-dimensional matrix;

matrix descrambling means for descrambling the order of the second predetermined order of the formed second two-dimensional matrix to form the first predetermined order of the original two-dimensional matrix; and

error correction means for correcting an error on the first predetermined order of the formed original two-dimensional matrix according to the error checking codes included in the formed first predetermined order of the original two-dimensional matrix to reproduce the target data.