A coded label comprising a code pattern in which first and second segments respectively being substantially square and having reflection factors different from each other are arranged in at least four rows and two columns, and in which at least two of either of the first and second segments are arranged in each column and at least one is arranged in each of the uppermost and lowermost rows.
Recording apparatus is disclosed adapted for connection to a telephone network and to receive voice signals therefrom characterized by an encoder for converting voice signals received from the telephone network into an optically readable image using a predefined code and a printer for printing the optically readable image. Also provided is playback apparatus comprising an optical scanner for producing a digital representation of a document on which is printed an optically readable image, a decoder for converting the optically readable image into audio signals using a predefined code and a transducer for producing a sound corresponding to the audio signals. The recording apparatus and the playback apparatus can be integrated into a single apparatus. In a preferred form of the invention, a device is provided which is adapted for connection to a conventional fax machine to form such recording or playback apparatus in conjunction therewith.
This method consists in introducing a programmed defect at the writing level; the defect will be detected at the reading level by means of a key corresponding to the writing control algorithm which is known only to the user.
Weighted and unweighted convolution filtering processes are provided for decoding bitmap image space representations of self-clocking glyph shape codes and for tracking the number and locations of the ambiquities or "errors" that are encountered during the decoding. This error detection may be linked to or compared against the error statistics from an alternative decoding process, such as the binary image processing techniques that are described herein to increase the reliability of the decoding that is obtained.
A data code having at least one unit, each unit being divided into at least two regions having similar dimensions. Selected regions of each unit are shaded to represent a unique value. Each unit has a unique arrangement of shaded regions to represent a particular characteristic whereby the data code may represent a decimal, a hexidecimal or a binary notation. This code does not require accurate printing, thereby enabling a user to read the code directly. A code sensor is used for reading the code.
A two dimensional row and column based system for storing digital data is formatted on a suitable base medium such as paper sheet 10. The data format is formed by a plurality of data units 10U having L data entry locations 14. The data is contained in the selective presence or absence of recording ink within the locations. Each data unit extends R locations along the row axis and C locations along the column axis. Any E entry locations of the L locations within the data unit are designated recording material present locations. The L-E remainder locations are designated recording material absent locations. The number of codes C that may be represented by these E in L type data units is determined by the relationship: The number of entries E is the same for each data unit throughout the data storage area, and cannot be less than E. Codes having the greatest number of presence absence interfaces are discarded to reduce the effect of recording ink intrusions into adjacent units. In decoding the code the locations with the highest greyscale are selected as recording material present locations.
