CA2448709C - Record with encoded data - Google Patents

Abstract

The present invention relates to a reader system for a record which has an information portion containing data encoded in an error-correctable format and a graphic image.

The reader system is comprised of a reading unit for extracting the data from the information portion. A
correction unit is provided which is coupled to the reading unit for performing error correction on the data to correct any errors in the extracted data. An output unit is coupled to the correction unit for outputting the extracted data after error correction.

Description

a RECORD WITH ENCODED DATA
This is a division of co-pmding Canadian Patent Application Serial No. 2,097,359, which was filed on May 3l, 1993.
BACKGROUND OF THE INVENTION
The present invention relates generally .to records which contain both machine-readable representations of data and images, and more particularly to records, such as driver's licenses, visas, tickets, or bearer bonds, in which the image, such as a photograph, is overlaid or represented in a manner similar to data relating to the image or to the record.
Currently, many records include both images, such as photographs, and data, such as text. Passports, visas, and driver's licenses include photographs of their owners and data about the use of the records. A passport has information recording the status of the traveler., A visa has information' regarding the purpose of the visit of the holder. A driver's license has information regarding the owner's driving restrictions.
Other records have images, such as pictures, and different types of data. For example, certain bonds will have a distinctive picture, such as of George Washington, as well as data about the bonds. Other records, such as stock certificates and the like, have similar types of images and data.
Currently, the data and images on such reco=ds are separate. There has been no mechanism to interrelate the data a,nd images in a way that enhances the properties of the record. Such enhawcement could be used to reduce counterfeiting, which is a problem both for records using a photograph for identification an_ for.records using a distinctive picture. -In combining the images and the data, it would also be advantageous to encode the~data to make it difficult to understand the information without the appropriate decoding machinery. This would further discourage counterfeiting.
There are also good reasons t~ encode the data into a format which allows a great deal of information to be placed on the record. For example, for those records which use photographs for identification, the information on the record could include further identifying information about the owner of the record , such as eye color, hair color, height, weight, etc. Then, if, a new photograph were inserted over the appropriate photograph, the information would not match the new photograph and the counterfeiting would be detected.
Another way to make counterfeiting more difficult is to place the encoded information over the picture:, If this were done, any replacement or alteration of the picture would.also remove or distort some of the verifying information as well.
There are problems.in doing this, however. The overlaid .;
information may distort or obscure the photograph, thereby making ~' it difficult to use the photograph for identification. In.
addition, the light and dark areas of the photograph may distort.
the information, making it difficult to read the information.
For records that have pictorial images, the problem is less one of identification than it is.of preventing multiple -redemption. In such cases, counterfeiting could be detected if the data on the record included information regarding the status of the record so that multiple redemptions could be detected. To make multiple redemptions all the more difficult, it would be: -advantageous to encode the information and to use the picture as a back-up security measure. Presently, this is not done . .
SUI~ARY OF THE INVENTION ~.
It is therefore an object of this invention to provide a record with a graphic image along with encoded information to .
validate or authenticate the record.
It is another object of the invention ~o provide such information without substantially distorting the graphic image.
It is a further object of this invention to provide a~record with'graphic .and encoded information such that any distortion in the information placed on the record can be easily detected.
'. Another object of the invention is to provide a graphic image encoded information on a record in such a way as to incorporate . -encoded information in the image.
Additional objects and advantages of this invention will be.
set forth in part in the description which follows and in part ~ - y will be obvious from that 'description, or may be learned by practice of this invent~.on. The advantages of this invention may be realized and attained by means of the instrumentalities and combinations particularly pointed in the appended claims.
To achieve the objects and in accordance with the purpose of the invention, as embodied and broadly described herein, a record according to this invention contains an image portion containing a graphic image and an information portion including data encoded in a machine-readable format. The format includes at least two adjacent rows of codewords, each codeword representing at least one pattern of marks.
More specifically, the information portion of the record may overlay the graphic image without obscuring it, and the machine-readable format can be error-correctable and capable of allowing recovery of the information despite distortion due to the graphic image.
Alternatively, the codewords may include a plurality of information words in the information portion, and a plurality of image words in the image portion, with each codeword containing a pattern of marks, and the patterns of marks of all of the image words representing the graphic image.
Iri accordance with one aspect of the present invention there is provided a reader system for a record having an information portion containing data encoded in an error-correctable format and a graphic image, the reader system comprising: reading means for extracting the data from the information portion; correction means, coupled to the reading means, for performing error correction on the data to correct any errors in the extracted data and output means, coupled to the correction means, for outputting the extracted data after error correction.
In accordance with another aspect of the present invention there is provided a reader system for a record containing data in an information portion and a graphic image in an image portion, the information portion containing a plurality of information words and the image portion containing a plurality of image words, the information words and data words being organized into alternating sequences in rows, each row containing a field indicating the lengths of the alternating sequences, the reader system comprising:
means for reading the field to determine the lengths of the alternating sequences of information words and image words;
means for reading only the information words in the row; and means for decoding the information words read.
BRIEF DESCRIPTION OF THE DRAWINGS' The present invention taken in conjunction with the invention described in co-pending Canadian Patent Application Serial No. 2,097,359, filed May 31, 1993, will be described in detail hereinbelow with the aid of the accompanying drawings, in which:
Figure 1A is a diagram of a driver's license with a two dimensional bar code overlaying a photograph;

i i ii 6 Figure 1B is a diagram of a portion of a bearer bond having :I
both data words and image words;
Figure 1C is a diagram of the bearer bond in Figure 1B afte r having been modified to reflect a redemption;
Figure 1D is an enlarged view of a portion of the bearer bond in Figure 1B;
Figure 2 is a diagram illustrating one example of a codewor in PDF417;
Figure 3 is a diagram illustrating the overall structure of a PDF417 symbol,~
Figure 4 is a table listing the number of error correction codewords for a given security level in PDF417;
Figure 5 is a block diagram of a system for printing and reading codes including an image;
Figure SA is a block diagram of a system for reading, modifying and reprinting' a record or a label.
Figure 6 is a perspective view of an encoding means of the system in Figure 5;
Figure 7 is a perspective view of a recognition means of the system in Figure 5;
Figure 8 is a perspective view of a data entry device and reader in which a key may be entered for encrypting and decrypting data;
Figure 9 is a flow diagram of the steps performed by the low-level decoder for decoding a two-dimensional bar code symbol;

j i i i Figure 10 is a flow diagram of the steps performed by the ;.
low-level decoder for determining the dimensions and security level of the symbol being scanned;
Figure 11 is a flow diagram of the steps performed by the low-level decoder for searching a scan.line of, data for a start or a stop pattern;
Figure 12 is a diagram illustrating the various width measurements that are used for the "t-sequence" of a codeword; ..
Figure 13 is a flow diagram of the steps performed by the low-level decoder for decoding a scan line of data into a vector of-codeword values and their cluster numbers;
Figures 14A, 14B, and 14C are.diagrams showing an example of a codeword vector;
Figure 15 is a flow diagram of the.steps ,performed by the low-level decoder for decoding an individual codeword value and its cluster number from the scan line data; and Figures 16A and 168 together area flow diagram of the step. -performed by the low-level decoder in order to update the codeword matrix using the codeword vector.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Reference will now be made in detail to presently preferred embodiments of the.invention, examples of which are illustrated in the accompanying drawings.
Figure 1A shows an embodiment of this inventiowin which encoded informatiowis overlaid on,a graphic image. Figure 1A
includes a diagram of a record 16 which is shown as a driver's license but could as well be a passport, visa, or. any other record a CA 02448709 2003-12-05 with an area that contains an image. Record 16 includes a graphi;
image 17 which, if record 16 were a driver's license, would be a photograph of the owner of the license.
Overlaid on top of image 17 is a two-dimensional pattern 18 containing encoded information. Preferably the information in pattern 18 is encoded in the PDF417 two-dimensional bar code described in detail below. One advantage of the PDF417 code is that it is error-correctable which allows recovery of information that maybe distorted due to the photograph or other image.
Pattern 18 is preferably printed in a very light colored ink which will not significantly distort the graphic image.
Alternatively, pattern 18 may be encoded in an ink that is sensitive to ultraviolet light and virtually transparent to visible light. In either case, pattern 18 should be placed over graphic image 17 in a manner that would not obscure or distort that : image .
The precise content of the information in pattern 18 is not critical to this invention but would preferably relate to record 16. For example, that information could relate to the holder of the item. If record 16 were a driver's license, the information could indicate that the owner of the driver's license was not authorized to drive without corrective lenses. If record 16 were a passport, the information could indicate that the holder of the passport has visited certain countries.
The information could also relate to the record itself. For example, the code on the visa could indicate that the visa was.a traveller's visa that expired on a certain date.

The advantage of the coded information overlaying the '. photograph is that such an arrangement would make it extremely difficult to change the information on the photograph without detection. Any changes to the information would be reflected in a change to the photograph, and changes to the photograph would cause changes to the information.
As another example of the benefits of this invention, the code could relate to the photograph itself. For example, the encoded information could include data on eye color, hair color, and sex, as well as height and weight of the holder.
Alternatively, the data could beta type of "faceprint" in which certain relationships in the face are encoded to identify the owner uniquely.
Such a record would hinder fraudulent identification involving the replacement of a photograph on a record used for identification. If done, this replacement may go undetected. If coded information were placed over the photograph that described the picture in the photograph, then such fraud would be much m~
difficult to practice.
The record 16 may also have additional human-readable data 20 on it, such as some text or a seal. Preferably, the human-readable data would not obscure or distort pattern l8.
The record l6 need not even be a small,item, such a.s a driver's license or a passport. Record 16 could be a large document with a graphic image, and the principles of the inventicr could still be used to obtain its advantages.

;, These types of records are exemplary only and rot intended ~~
limit the invention beyond its allowable scope. Instead, it will be apparent.to those of. ordinary skill how the inventive concept can be realized in a large number of applications.
Graphic images and encoded data can be interrelated in another way as well. Figure 1B shows a portion. of a record 316;
which is shown as a bearer bond but could as well be'another instrument, such as a stock certificate. In Figure 1B, record 316 includes an.information portion 318, which includes a pattern of encoded data, and a graphic image portion 317, which has a distinctive picture. Preferably, the information in pattern 3I8 would contain a plurality of information words, such as code words in the PPF417 code discussed below.
Information portion 318 may contain encoded data which identifies the owner of record 316, or may contain certain other data about record 316, such as a unique identification code and its value at certain anniversary dates. Information portion 318 can also include data about redemptions. In this embodiment, each time the bearer bond was redeemed or some other action was taken, a slight'change would be made to the information words in area 318 and to the image portion 317. The result would be a new record 316' as shown in Figure 1C with an information portion 3,18' and an image portion'317' which differed slightly from the corresponding areas of record 316. The advantage of using bonds or other records in this way would be to thwart counterfeiting Appropriate equipment would detect an attempt to duplicate record 316 in order to redeem it multiple times.

v For example, a reader of such bonds would be used when record . 315 was redeemed, and a central computer coupled to that reader would note such redemption to preclude redemption of an identical bearer bond.
Image portion 317 in Figure 1H preferably consists of severs l image word s which have alternating black and white areas to effect a desired shading. The shading produced by the image words wou~
appear as the picture on the record. In Figure 1B, the picture in image portion 3,17 is of George Washington which would preferably be represented by several image words. The change made to image..
portion 317 when bearer bond 316 is redeemed should be so slight .
as to make it nearly impossible to detect differences between image~~portions 317 and 317' Figure 1D shows a section 320 of either record 316 or 316' in great detail to illustrate one mechanism o~f implementing an embodiment of this invention: Section 320 represents a rectangle which includes the upper left hand corner'of image portion 318 or 317', and the surrounding areas in information portion 318 or 318'. The record has several rows 321, 322, 323, 324, 325, 326, 327, and 32$. Rows 321 and 322 contain only information words. , Rows 323, 324, 325, 326, 327 and 328 contain a sequence of information words followed by a sequence of image; words. As 'I-.
explained above, the shading of the image words reflect the shading of the image, whereas the information words contain , encoded data.
Preferably each row has a field at one or both ends indicating the lengths of the alternating sequences of informatio::

words and image words. The length of a.sequence of information words can be designated by the number of such words. The lengths of a sequence data wards can be designated by=absolute lengths.
The purpose of the fields is to identify information words for devices reading the rows, so those devices do not decode image words. This can also be obtained by using start and stop symbols at the beginning and each of each sequence of information words.
The fields in the rows can also contain other information, such as row number, to help identify desired locations in record 316. This is particularly important when modifying records after .
redemption.
Code PDF417 -Before discussing the method and apparatus for.encoding and decoding data in machine readable graphic form, such as the two-dimensional bar cads PDF417, it is important to understand. the structure of the two-dimensional bar code symbol itself.
Each PDF41'7 symbol is composed of a stack of rows of bar-coded information. Each raw in the symboT.consists of a start pattern, several symbol characters called "codewords," and a stop pattern. A codeword is the basic unit for encoding a value representing, or associated with, certain numbers, letters, or other symbols. Collectively, the codewords in each row form data columns. .
Both the number of rows and the number of data columns of. the PDF417 symbol are variable. The symbol must have at least three rows and may have up to ninety .rows. Likewise, within each row, the number of codewards or.data columns can vary from three to thirty: ' Each PDF417 codeword consists of seventeen modules or units.
There are four bars and four spaces in each codeword. Individual bars or spaces can,vary in width from one to six modules, but the combined total per codeword is always seventeen modules. Thus.
each codeword can be defined by an eight-digit sequence, whicr.
represents the four sets of,alternating bar- and space widths within the codeword. This is called tha "X-sequence" of the codeword and may be represented by the sequence X~,X1,..:X'. For example, for an X-sequence of "51111125", the first element is five modules wide, followed by five elements one module wide; or element two modules wide, and the last element five modules wide.
This example is illustrated in Figure 2.
The set of possible codewords' is further partitioned into three mutually exclusive subsets called "clusters.° In the PDF4I7 symbol, each row uses only one of the three clusters to encode .
data, and each cluster repeats sequentially every third row.
Because any two adjacent rows use different clusters, the decoder is able to discriminate between codewords from different rows within the same scan line.
The cluster number of a codeword may be;determined from its X-sequence using the following formula:
cluster number = (X~ - X2 + X4 _ X6) mod 9 where "mod 9" is the remainder after division by nine. Referring to the codeword in Figure 2, the cluster number is.calculated as' f of lows cluster number= (5- - l + l - 2) mod 9 - 3 To minimize error probabilities, PDF417 uses only three clusters, even though, nine are mathematically possible. Thus, each row uses only one of the three clusters 0, 3, or 6, to encode data, with the same cluster repeating sequentially every third row. Row 0 codewords, for example, use cluster 0, row 1 uses cluster 3, and row 2 uses cluster 6, etc. In general, the clusL
number may be determined from the row number as follows: ~, cluster number _ ((row number) mod 3) * 3 There are 929 codeword values defined in PDF417. These .
values are 0 through 928. Each cluster presents the 929 available ,, values with distinct bar-space patterns so that one cluster canny ~~
be~confused with another.
Figure 3 is a block diagram showing the overall structure of a PDF417. symbol. Each row of the symbol consists of a start pattern, a left row indicator codeword L~, data codewords dl or error detection/correction codewords Ci, a right row indicator codeword Ri, and a stop pattern. The minimum number of codewords in a row is three, including the left row..indicator codeword, at least one data codeword, and the right row indicator codeword.
w The right and left row indicator codewords, which are discussed further below, help synchronize the structure of the symbol. . , The start and stop patterns identify where each row of the symbol begins and ends. PDF417 uses unique start and stop patterns'. The start pattern, or left side of each row, has the unique pattern, or X-sequence, of "61111113°'. The stop .pattern, r or right side of each row, has.the unique X-sequence of "711311121".
Every symbol contains one codeword (the first data codeword in row Q} indicating the total number of codewords within the symbol, and at least two error-detection codewords C~ and C1.
These two error-detection codewords together form a checksum whicr is two codewords long.
A PDF417 symbol can also encode data with error correction capability. The level of error correction capability, called the "security level," is selected by the user and ranges from 0 to B.
This means, for example, that at level 6, a total of 126 codewords can be either missing or destroyed and the entire symbol can be read and decoded. Figure 5 is a table. showing the relationship between the security level of the PDF417 symbol and the number of error correction codewords Ci.
In addition to correcting for missing or destroyed data (known as "erasures"}, PDF417 can also recover from misdecodes of codewords. Since it requires two codewords to recover from a misdecode, one to detect the error and one to correct it; a given security level can support half the number of misdecodes that it can of undecoded codewords.
This error correction feature is particularly useful when information in PDF417 format overlays a gzaphic image. Because, as explained above, the encoded information should not obscure or distort the image, the ink used for information must be light-colored. This creates the possibility that the graphic image will distort portions of the encoded information. If that happens, errors can be corrected with the PDF417 two-dimensional bar code.
The row indicator codewords in a PDF417 symbol contain several key components: row number, number of rows, number of data columns, and security level. Not every row indicator contains every component, however. The information is spread over several rows, and the pattern repeats itself every three rows. The pattern for encoding the information in the row indicator codewords can be illustrated as follows:
Row o: Lo (row #, # of rows) Ro (row #, # of columns) Row 1: L1 (row #, security level) R1 (row #, # of rows) Row 2: L2 (row #, # of columns) R2 (row #, security level) Row 3: L3 (row #, # of rows) R3 (row #, # of columns) etc.
In other words, the left row indicator codeword Lofor the first row 0 contains the row number (0) and the total number of rows in the symbol. The right row indicator codeword Rofor row 0 contains the row number (0) and the number of data columns in the symbol, and so on.
Encoding data into a PDF417 symbol is typically a two-step process. First, data is converted into codeword values of 0 to 928, which represent the data. This is known as "high-level encoding". The values are then physically represented by particular bar-space patterns, which is known as "low-level encoding".
Encoding/Decoding System Encoders and decoders are discussed more completely in U.S. Patent No. 5,319,181 issued June 7, 1994.

Referring now to Figures 5-? in the drawings, Figure 5 is a block diagram of the system 10 for representing and recognizing data or a record in machine readable graphic image form. System 10 includes an encoding means, generally indicated by the reference numeral 12, and a recognition means, generally indicated by the reference numeral 14. Encoding means 12 produces a record 16 Figure 1A), such as a driver°s license, visa, or passport, wit.
photograph . Overlaying the photograph would be data encoded in a two-dimensional pattern 18. Record 16 may also contain 'human readable data 20, such as text. The two-dimensional pattern l8 on record 16 is recognized by recognition means 14 to produce output signals representative of the data encoded into the pattern 18.
Data to be encoded into the two-dimensional pattern 18 on record 16 is entered into the encoding means 12 by entering means 22. The data entered by entering means 22 may include both data to be encoded into the two-dimensional pattern 18 and the data to appear on record 16 in human readable form. That data can even include the photograph or image. Processing means 24 encodes the set of data into a two-dimensional pattern l8 and generates transfer drive signals for controlling the transfer of the indi~
onto the record 16. Transferring means 26 transfers an image of the two-dimensional pattern 1.8 onto record 16 in response to the transfer drive signals. Preferably, transfers ng means 26 includes a printer which transfers either light-colored ink or ultraviolet-light sensitive ink as explained above.
If human readable data is also to be transferred onto record 16, the processing means 24 generates a second set of transfer y . 18 w drive signals for controlling the transfer of the human readable data onto record l6. A portion or all of the data to be encoded and the human readable data may be transferred from a storage memory in processing means 24 or other computer files rather than being entered by means 22.
Recognition means 14 includes converting means 28 that converts the image on record l6 into electrical signals representative of the graphic indicia.. Decoding means 3O decode:.
the electrical signals into decoder output signals, indicated at 32, that are representative of the data encoded into the pattern 18.
Figure 6 is a perspective view of one-embodiment of encoding means 12. The embodiment of Figure 6 is for illustrative purposes, and not meant to limit the scope of the invention. In this embodiment, the entering means 22 of Figure 5 is shown in form of a keyboard 32 for entering alphanumeric and graphic data '' into the encoding means 12. Entering means 22 may take forms other than a keyboard, such as an optical scanning means for .
scanning data-directly from documents for entry into the encoding - r.
means 12.
Referring again to Figure 6, the processing means 24 of Figure 5 is shown in the form of a processor and display unit 34.
The data entered by keyboard 32 is transmitted to the processor ' and display unit 34 for storage and processing. In addition, to entering data, the keyboard 32 is also used for entering control commands to effect operation of the processor unit 34.

The data entered by keyboard 32 is preferably displayed on display screen 36, and upon entry of a proper control command, is also stored in memory. The data to be encoded into the pattern 18 is stored in a first memory in processor 34, and the data, if any, to be transferred in human readable form is stored in a second memory. Alternatively, both data may be stored in a separate portion of a single memory. Upon the appropriate control command from keyboard 32, the processor unit 34 encodes the data in the first memory into a two-dimensional pattern 18 and generates first transfer drive signals representative of the data stored in the first memory. The processor unit 34 also generates second transfer drive signals representative of the data stored in the second memory.
The processor unit 34 is shown in Figure 6 as being coupled to a printer 38. Printer 38 is one form of the transferring means 26 of Figure 5. Printer 38 transfers an image of the two-dimensional pattern 18 on record 16 in response to the first transfer drive signals and prints the second set of data in human readable form onto record 16 in response to the second transfer drive signals.
Turning now to Figure 7, the recognition means 14 includes a card reader 40 which contains the converting means 28 and the decoding means 30 of Figure 5. The use of appropriate converting means that corresponds to the particular data encoding technology employed is contemplated by the present invention.
The converting means 28 may be a bar code reader such as those disclosed in U.S. Patent No. 5,591,952 issued January 7, 1997 and U.S. Patent No. 5,414,250 issued May 9, 1995 and which can read the ink used by printer 38.
The readers disclosed in the above patent applications are open system devices designed to read an optically encoded two-dimensional bar code and to convert the light reflected from the pattern into electrical signals representative of the graphic indicia.
The decoding means 30 decodes the electrical signals into output signals representative of the data encoded onto record 16. The decoder output signals are outputted from the recognition unit 40 to various output means 42. Figure 7 depicts two examples of output devices, one being a display unit 44 and the other a printer 46. Display unit 44 may be any suitable display such as liquid crystal display or a CRT.
The printer 46 may be any print device such as a dot matrix printer, laser printer, etc.
The system maximizes the use of available space for encrypting data. The density of the encoded data is such that for a two-dimensional bar code symbol, a minimum of about 1600 characters can be encoded into a space of approximately 5" x 1/2". In addition to being compact, the system provides for high security in the transmission of information.
Although the encoding means 12 and the recognition means 14 are shown in Figures 5-7 as separate devices, they can be in the same device. This is particularly useful when a record 316 (Figure 1B) is read and modified. In such cases it would be useful to have a single unit for both purposes.
Figure 5A shows a block diagram of a system 10' for use with record 316 in Figure 1B. System 10' includes elements that s CA 02448709 2003-12-05 correspond to those of system 10 shown in Figures 5-7.
Specifically, system l0' includes a converting means 28'.which converts the encoded data from record 316 into electrical signals, and a decoding means 30' which decodes those signals. Processing means 24' then reads the decoded signals and, based upon certain criteria, cause transferring means 26' to print appropriate out--signals to modify record 316 (Figure 1B) into record 316' (Fig 1C).
The slight variations could be determined in a variety of ways. For example, if record 316 is a bearer bond on a stock certificate, processing means 24' could be a large computer or a computer network which keeps track of redemptions. Processing means 24' could also receive data on either the interpretation of the information or the printing of the information using entering means 22' Processing means 24' also preferably includes alignment means 25' for locating selected areas of record 316 for reading a printing. Alignment means 24' interprets fields that identify rows and particular words in those rows. Although alignment 25' is shown as part of processing means 24', it could also be a microprocessor in either converting means 28' or transferring means 26'. .
Data may also be encoded using a keyed encryption, algorithm that may be accessed only by an encryption key. As shown in Figure 8, the data entry means 47 contains the keyed algorithm and upon entry of the key 49, the data will be encoded into a two-dimensional graphic pattern in a unique configuration. The unique < CA 02448709 2003-12-05 i ~ ~ 22 configuration can only be read by a reader 48 having the proper algorithm, and only upon entry of the key 49 into the reader.
Thus, a high degree of security may be provided with the keyed encryption embodiment.
Another feature of the present invention is to have the image .
on record 316' be a "digital signature" which is embedded as the PDF 417 bar.code in encrypted form. The printer which created two dimensional digital signal would then use a keyed encryption algorithm that could be accessed only by an encryption key. By use of a keyboard or other data entry means which had the keyed algorithm, and upon entry of the key, the data entered as plain text on a keyboard would be encoded~into the two dimensional graphic pattern in a unique decoded configuration. The unique pattern or code configuration could only be decoded and read by a y reader~having the algorithm and only upon entry of the identical key into the reader. This provides a high degree of security for applications needing such security.
A low-level decoder may be embodied in a computer program operating on a microcomputer separate from the host computer. T:
low-level decoder would be preferably connected to the host computer by a standard interface, such as an RS-232 interface, for transmitting the codeword values after they are decoded.
Alternatively, the low-level decoder could be embodied entirely in hardware, or a combination of a hardware and software, which is physically located in either the scanner itse~.f or the host computer.

The matrix of codeword values from low-level decoder is decoded into usable data by a high-level decoder, which may be embodied as a separate computer program operating on the host computer. For example, PDF417 has three predefined modes and nine reserved modes. The predefined modes are Binary, EXC, and Numeric. In the Binary mcde, each codeword can encode l.2 bytes.
In the EXC mode, the alphanumeric data can be encoded in double density (i.e., two characters per code word), and in Numeric mode, the numeric.data can be packed in almost triple density: ' Therefore, the high-level decoder in host computer 112 will further decode the codeword values (0-928) from.low-level decoder 114, depending on the mode, to obtain the actual data embodied in the symbol. The decoded data from the high-level decoder may then be used by a user application program also operating on the host computer 112. .
Figure 9 is a flow chart showing the sequence of operation of a low-level decoder for decoding a two-dimensional bar code symbol such as PDF417 into a matrix of codeword values. The various steps in the sequence are embodied in a software computer program which is stored and executed .by processor 34.
In the first step 150 in Figure 9, the low-level decoder initializes the scanner interface and initiates scanning o.f. the .
symbol. The actual functions performed in this step will depend on the type of scanner and will involve various scanner-dependent routines to 'initialize-the scanner. interface and to start scanning: .

In step 152, the low-level decoder attempts to determine the dimensions and the security level of the symbol being scanned.
Specifically, this step determines the number of-rows, the number of data columns, and the security level of the symbol from the left and right row indicator codewords. These dimensions are then used to initialize a two-dimensional codeword matrix and other related parameters for decoding the symbol. Each location in the matrix contains both a codeword value and an associated confidence weight., which are initially set to a null or. empty value. If the dimensions and security level of the symbol cannot be determined, then the scan is aborted. This step will be discussed in further detail below in connection with Figure 10. ..
Continuing in Figure 9, step,154 is the first step.in a control loop in which the rows of the two-dimensional bar code symbol are repeatedly scanned and the codeward values are filled into the codeword matrix. The steps of the control loop are each repeated until the number of codewords remainiwg in the matrix which have not been successfully decoded is small enough that the rest of.the matrix can be determined using the built-in error .
correction capability of the symbol. Thus,-in step 154, if the number of codewords Which have not been successfully decoded is -less than the error correction capability of the symbol based on the security level (see Figure 4), an attempt is made to correct .
the matrix using the error-correction codewords. If the attempted error correction is successful,_ then in step 156, the control loop is exited and scanning is terminated in step 158. Otherwise, if the attempted error coxrect.ion is not successful, then the ~ CA 02448709 2003-12-05 following steps 160-164~are performed to try to decode additional codewords to fill in the matrix. .
First, step 160 searches a.scan line of data obtained from the buffer area of the memory for a start or a stop pattern. If either a start or a stog .pattern is found, then in step 162, the.
low-level decoder attempts to decode as many codewords as possi?-from the scan line. Specifically, the scan line. of data is par into individual codewords whose values and cluster numbers are placed in a codeword vector ready for incorporation into the .
codeword matrix. Both steps 160 and 162 are discussed in further detail below in.connection with Figures 1l and 13, respectively. ' The codeword vector produced, in step 162 is analyzed and.th~
used to update the codeword matrix in steg 16,4. In particular, step 164 assigns a confidence weight to each codeword value depending on whether its nearest neighbors were also decoded. Row numbers are also assigned to each codeword value based on the left or right row indicator codewords and the corresponding cluster number for the codeword. If the scan line crosses a row bound..--.
the cluster numbers of the codewords can be used to determine t.
correct row number for each individual codeword. For example, if a decoded scan line has a left row indicator with row number 2, ,-and the cluster numbers df the following codewords are 6, 0, 0, 3, the codewords are accordingly placed in the .following locat.i.onss °-Grow 2, column 1); (row 3, column 2); (row 3, column 3); and (row 4, column 4): In this way, a single scan line of data can contain codewords from more than one row, which can then be stitched into the appropriate location-in the codeword matrix. This step is .discussed i~ further detail in -connection with Figures 16A and 163 below.
Figure l0 is a flow chart showing in greater detail the ~, sequence of steps for determining the dimensions and security level of a symbol as referred to in step 152 of Figure 9 above.
In the first step 170 of Figure 10, the low-level decoder searcr~
a scan line of data obtained from the buffer area of the memory for a start or a stop pattern. This step is the same as step 160 in Figure 9 and is discussed in further detail in connection with Figure 11 below.
Step 172 then decodes the first codeword immediately adjacent to either the start or stop pattern found in the previous step. w As shown in Figure 3, this codeword will be either a left or right row indicator codeword containing the row number and either the number of rows, the number of data columns, or the security level of the symbol. If both a start and a stop pattern are-found, then both the left and the right row indicators are decoded. The sequence of steps for decoding an individual codeword are, discussed further below in connection with Figure 15.
Continuing in Figure 10, in step 174 the particular dimension or security level encoded in the row indicator is extracted from the codeword value and the cluster number determined in the previous step 172. For-example, for a left row indicator codeworc with a cluster number of 0, the number of rows is.extracted from.
the codeword value.
A confidence weight assigned to each of the dimensions and the security level is initially set to 0. Steps 176-184 update ., 27 both the current value and the confidence weight of the dimension or security level extracted in the previous step in the following way. First, the particular parameter, say the number of rows, is compared to the current value of the number of rows obtained from previous decodes. If the current value of the number of rows and the newly decoded value are the same, as determined in step 176, then the confidence weight assigned to the number of rows is increased, in step 178. If the current value and the newly-decoded value are different, however, then the confidence weight is decreased in step 180. If the confidence weight assigned to the ,~
particular parameter~is decreased below zero as determined in steF
182, then the newly decoded value is substituted for the current value and a new minimum weight is assigned to the parameter in ste .184.
Step 186 determines whether the confidence weight for.all three parameters, i.e., number of rows, number of data columns, and security level, exceeds a predetermined threshold: If so, then the two-dimensional codeword matrix is initialized in step 188 based on the current values of the number of rows and the .
number of columns. The number of correctable errors may also be determined from the current value of the security level according to the table in Figure 4. If all three confidence weights do. not exceed the threshold in step 186, however,. then program. control returns to step 170 to begin searching for the start and stop patterns in a new scan line. Steps 170-18.4 are repeated until a1.1 three -parameters have been successfully decoded with a.high degree of confidence.

:.
Figure 11 is a flow chart showing in greater detail the sequence of steps forsearching a scan line of data for a start ;:r stop patterw as referred to above in step 150 of Figure 9 and,step 170 of Figure 10. Briefly, the search begins at the first location of an individual scan line of data obtained from the buffer area of the memory and is repeated at sequentia-1 locations until either a match is found or the length of the scan line is exceeded. When a match is found, an index-is set to a.location ' immediately following or preceding the pattern for decoding the adjacent code word.
As.shown in Figure 11, the first step 200 sets an index to the location of the data elements in the scan line to "1.,"
indicating the first data element or integer value of the scan line. This index is used to identify the first element of each sequence of eight elements in the scan line for comparison to the, start and stop patterns.
Step 202 is the first step of an iterative loop for searching the scan line from left to right for either a start or.a stop pattern. In this step, if the current index is less.than the length of the scan line, then the remaining steps are executed and, the search continues. Once the index exceeds the length of the scan line, however, then the loop is exited and an indication is returned signifying that the search failed and a start or stop pattern was not found.
Rather than using the x-sequence of codeword, the low-level decoder decodes a symbol by using "edge to similar edge" .
measurements to compensate for ink spreading which occurs when printing the symbols. Thus, in step 204, a raw,"t-sequence" is obtained from the scan line by adding pairs of consecutive intege_ values beginning at the location specified by the index.
Specifically, the raw t-sequence, which corresponds to the seven width measurements tl,t2,...t~ shown in Figure 12, is calculated by adding pairs of the consecutive integer values x~;xl,:..x~, representing the widths of the bars and spaces, as follows:
t1 =_ x0 + x1 .
t2 ~ x1 + x2 t3 - x~ + x3 etc.
A width W for the entire codeword is also calculated in step 204 by summing the eight integer values x~ + x1,+ . . . + x~. -For the codeword in Figure 12, for example, the sequence of integer values from the scan line, representing the widths of the bars and spaces might be something like: 43, 19, 21, 19, 22, i8:
103, 96. The raw t-sequence tl,t2,...t~ would then be 62, 40, 41, 40, 121, 199, and the width W would be 341.
In step 206 in Figure 11, the raw t-sequence obtained in step 204 is normalized and rounded to integer values. Specifically, a value for the codeword's "module" or "unit" is first established by dividing the width W of the codeword by the total number of units for each codeword. In a PDF417 symbol, each codeword is seventeen units, so that the width W is divided by seventeen to obtain the unit of the codeword. Thus, for the example in Figure 12, the unit would be (341/17) - 20Ø Each value of the raw, t-sequence is then divided by the unit and rounded t.o aw integer~to i normalize the t-sequence: The normalized t-sequence for the codeword in Figure 12 is 3, 2, 2, 2, 2, 6, 10.
The normalized t-sequence is then compared to the t-sequences of the start and stop patterns of the code in steg 208. If the scanner scans from both left to right and right to left, then the t-sequence must be compared to the start and stop patterns in be their normal and reverse orientations. .
If there is a match in step 210, then the index is set in stepw 214 to.a location in the scan line immediately following the pattern if it is a start pattern or immediately preceding it if it is,a stop pattern. If the current t-sequence does not match either the start or the stop pattern, however, then in step 212, the index is incremented by one and steps 202 through 210 are repeated until either a match is found or the length of the scan line is exceeded.
Figure 13 is a flow chart showing in greater detail the sequence of steps for decoding a scan line of data into a vector of codewords and their clusters as referred to in step 162 o_f Figure 9 above. In decoding the individual c.odeword values and cluster numbers from the scan line, the low-level decoder begins decoding at the start or stop pattern and decodes as many codewords possible. For those codewords that, are not successfully decoded, the codeword values in the codeword vector are set to --,. BAD . ,.
At the-completion of the sequence of. steps shown in Figure 13, the codeword vector will contain certain codeword values and cluster numbers in locations corresponding to the appropriate columns of the codewords that were successfully decoded. Figure 14A shows an example of a codeword vector in which the co d ewords in eight of the ten columns were successfully-decoded. T he codeword values in columns l and 10 correspond to the lef t row indicator codeword in row 2 (L2) and the right.row indicaf or codeword in row 1 (R1); respectively. The codewords in columns 5 and 7 were not successfully decoded as indicated by the notation "BAD" in those locations of the codeword vector.
Returning to the first step 220 of Figure 13, an upper limit on the number of codewords that may be decoded ("cwlimit") is set equal to the number of columns in the codeword matrix. If this number of codewords is successfully decoded, then the decoding process for the current scan line is obviously complete.
Step 222 determines the direction of the scan if the scanner scans from both left to right and right to left. If the particular scan was from Ieft to right as determined in step 222, then the column number of the first codeword is set to "1" in step 224 and the amount that it will incremented by (°incr") each time a subsequent codeword is decoded is set to "+1." If the scan was from right to left, however, then in step 226, the column number of the first codeword in the scan line will be the last column of the codeword matrix, and the incremental value is set to '-1."
Step 228 is the first step of a contral loop in whi c h individual codeword values and their cluster numbers are decoded from the scan line of data. In step 228, the codeword limit is tested to see if it is still greater than zero. If not, then all of the codewords in the scan Iine have been decoded-and the loop is exited.
Otherwise, step 230 obtains the next codeword. value and its cluster number from the scan line. This step will be discussed i further detail below in-connection with Figure.-15. ' If the codeword decoded in the previous step is a valid codeword as determined in step 232, then in step 234 the codewor~
value and its cluster number are saved in the codeword vector at a location corresponding to the column of the codeword. The codeword values thus placed in the codewo.rd vector are ready for.
incorporation into the codeword matrix:
If the codeword decoded in step 230 is not a valid codeword, however, thewthe-codeword vahue in the codeword vector corresponding to the current column is set to "BAD" in step 236 to indicate that this codeword was not successfully decoded. A ~BAD"
codeword is most likely to occur when the scan line crosses the boundary between two rows iw the middle of the codeword. ..
Finally, in step 238., the current column nmi~ber is either incremented or decremented depending on the direction of the scan, and the codeword limit is decremented by one. Steps 228-236 are then repeated until there has been an attempt to decode all of the codewords in the scan line.
Figure 15 is a flow chart diagram showing the sequence of steps corresponding to.step 230 in Figure l3 and step ,172 in Figure 10 in which an attempt is made .to. decode an individual codeword value and cluster number 'from the scan line. In the first step 240, a raw t-sequence and the width W are obtained from the scan line. This same step was discussed greviously in connection with step 204 in Figure 11.
In step 242, the width W of the eight elements presumed to ae the next codeword are compared to the width of the previously decoded codeword. If the current width W is not within a range o' plus or minus a predetermined difference (de.ltaj, then there is probably a split (undercount by,a multiple of two elements) or .
merge (overcount by a multiple of two elements) error in the .
current codeword. This-codeword is not decoded further,. but rather in step 244 its value and cluster numbex are both set to BAD to indicate that it could not be decoded.
Then in step 246, an attempt is made to resynchroni.ze to t~ ~~.
boundary of the next codeword by finding a t-sequence with a corresponding width W that falls within a given. tolerance of the expected width of a codeword, based on the width of the previous codeword. If the current width W is significantly greater than the expected width, indicating a possible merge error, then the last two.integer values are dropped from the t-.sequence until iw falls within the proper limits. Likewise, if. the current width W
is significantly less than the expected width, indicating a possible split error, the next two integer values in the scan line are added to the t-sequence until it falls within the proper limits.
If the current width W is Within a certain tolerance of th~ .
expected width, as determined in step 242, then an attempt is ma..=
to decode-the codeword. in step 248, the raw t-sequence is normalized as described above in connection with step 206 in, i Figure 11. Then instep 250, the cluster number is determined from the normalized t-sequence. The cluster number may be determined from the t-sequence (as opposed to the X-sequenc a described above) as follows:
cluster number = (T1 - TZ + TS - T6) mod 9 y For codewords in PDF417, valid cluster numbers are 0, 3, and 6. If in step 252 it is determined that the cluster number is n 0, 3, or 6, then the codeword is notwalid. Accordingly, in step 254 the cluster number and value are set to "BAD." to indicate that the codeword was not successfully decoded.
Otherwise, in step 256; the normalized t-sequence and its cluster number are used to find the corresponding codeword value' in a look-up table. If no corresponding codeword value is found for the t-sequence, then the codeword value is set to "BAD",to indicate that it was not successfully decoded.
Finally, in step 258 the "last width" value is updated to the current width W of the codeword for use~in decoding the next codeword value from the scan line.
Figures 16A and 168 together comprise a flow chart of the sequence of steps executed by the low-level decoder in order to w update the codeword matrix using the codeword vector.. These figures explain in greater detail step 164 in Figure 9 discussed above.
The first step 260 of Figure 16A checks the first and last, values in the codeword vector to see if either is a valid row indicator. If neither the first nor the last values in the codeword vector is a valid row indicator, then in step 262 the program exits the routine and no attempt is made to~ update the w codeword matrix using the codeword vector.
If a valid row indicator is present, however, then in step 264 confidence weights are assigned to each codeword value in ti:e codeword vector. Specifically, a confidence weight is assigned each codeword depending on whether its nearest neighbors and the cluster were also decoded: For example, as shown in Figure 14B, the codeword values 'in columns-1, 2, 3, 9, and 10 are assigned high'confidence weights ("H") because their immediate neighbors were also successfully decoded and have the same cluster number.
The codeword values for columns 4 and 8 are assigned medium confidence weights ("M") because one of their neighbors was successfully decoded and has the same cluster number but the other neighboring codeword value is "BAD:" The codeword value in column 3 is assigned a very low confidence weight ("L") because neither of its neighbors was successfully decoded. Thus; the confidence weight for a codeword 'value at column i in the codeword vector is essentially a function of the cluster numbers of the code~aords at columns i - 1, i, and i + 1. This .function may be implemented by a look-up table whose index is calculated from the cluster numbers ' of the three codewords. w In step 266, a row number is assigned to each codeword value.
in the codeword vector based on the row indicator codewords and the cluster numbers: As shown in the example in Figure 14C, the left row indicato.r.codeword L2 indicates that the row number is 2 and the cluster number is 6. The cluster numbers for the codeword values in columns 2-4 are also 6. Therefore, row number 2 is assigned to the codeword values in the first four columns of the codeword vector:
Also in the example in Figure 14C, columns six and 8-10 aii have a cluster number of 3 and the right row indicator codeword R.

indicates that the row number is 1. Therefore, it can be assumed that the scan line crossed the row boundary between row 2 and row 1 and the codeword values in columns 6 and 8-10 should be assigned to row 1.
Once the confidence weights and row numbers have bee n assigned to each of the codeword,values in the codeword vector;
the codeword matrix is updated one codeword at a time. In step 268, the column number C of both the codeword vector and the codeword matrix is set is initially set to '°1.° Step 270 is the first step of an iterative loop which steps through the codewords in the codeword vector and uses them to update the corresponding codewords and their associated confidence weights in the codeword matrix. When the.column number C exceeds the number of columns in step 270; then all of the codewords in the codeword~ vector have been processed and the routine ends.
For each codeword in the codeword vectox, step 272 sets the row number R of the codeword matrix to the row number assigned in step 266 to the codeword in the codeword vector at the location Thus, for each codeword value in the codeword vector, there is a corresponding value in the codeword matrix at location [R,C].
Cvntinuing.in Figure 16B, step 274 determines whether the current codeword value in location [R,C] in the codeword matrix is the same as the corresponding codeword value in the codeword vector at column C. If the values are the same; then in step 2'S, the conf iden,ce weight assigned to the codeword value in matrix location [R,C] is increased by the confidence weight of t he corresponding codeword value in the codeword vector. If not, the confidence weight of the codeword value in the matrix is decreased by the confidence weight of the codeword value in thewecfor in step 278.
If the confidence weight was decreased in step 278, then i:.
step 280 that confidence weight is tested to see if it wa s decreased below zero. If the confidence weight is less than zerc, then in step 282 the new codeword value in the codeword vector is substituted for the current codeword value in the corresponding location in the codeword matrix. The confidence weight a ssignec to the codeword value in the matrix is also changed to a positive value in step 284:
Finally, in step 286 the column number C is incremented by 1 for processing the next codeword value in the codeword vector and program control is returned to step 270 for repeating steps 272 through 286 for all of the columns in the vector.
Returning briefly to step 154 in Figure 9, each time after the codeword matrix has been filled in with the new vecto r of codesaord values and the confidence weights have been updated, an attempt is made. to fill in the rest of the matrix using the built-in error correction capability of the symbol. The numbe r and location of codewords which have not yet been successful 1y decoded may be determined by comparing the confidence weights assigned _ each of the codeword values in the matrix with a predetermined i,:
CA 02448709 2003-12-05 , threshold. Those values' having confidence weights below the threshold are considered to not yet be decoded. If the n umber of codewords not yet decoded is less than the error correct ion capability of the symbol as determined by the security 1 evel, the~
an attempt is made to correct the matrix.
It will be apparent to those skilled in the art that various modifications and variations can be made in the decoding method and apparatus without departing from the sGOpe or spirit of the invention-. Other embodiments of the,invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. It is intended that the specification and examples be considered as exemplary only, with,a true scope and spirit of the.inventian being , indicated by the following claims.

Claims (3)

1. A reader system for a record having an information portion containing data encoded in an error-correctable format and a graphic image, the reader system comprising:
reading means for extracting the data from the information portion;
correction means, coupled to the reading means, for performing error correction on the data to correct any errors in the extracted data: and output means, coupled to the correction means, for outputting the extracted data after error correction.

2. The reader system of claim 1 wherein the reading means includes:

scanning means for locating the information area: and decoding means, coupled to the scanning means, for decoding the encoded information from the information area.

3. A reader system for a record containing data in an information portion and a graphic image in an image portion;
the information portion containing a plurality of information words and the image portion containing a plurality of image words, the information words and data words being organized into alternating sequences in rows, each row containing a field indicating the lengths of the alternating sequences, the reader system comprising:
means for reading the field to determine the lengths of the alternating sequences of information words and image words;
means for reading only the information wards in the row;
and means for decoding the information words read.