Hand-held scan data handling system

Claim 3

The method for optically reading as set forth in claim 1 including the step of establishing a predetermined restraint condition for inhibiting plural output indications from any character the image of which is captured.

Claim 4

An optical character recognition system utilizing a hand-held wand for optically reading alphanumeric characters on a character field and automatically processing and transmitting the data to receiver and/or display devices, which comprises: a two-dimensional photo sensor array of height in cells greater than the array width in cells to produce optical images of each character as a set of electrical signals during horizontal relative movement between said wand and said field, means responsive to the electrical signals to produce one bit binary codes representing an image, means for storing the one bit binary codes as character segments and background segments, a blanking circuit means to inhibit multiple loading of a single character into said means for storing upon operating of the hand-held wand at a high frame rate and a low hand-swept velocity, and a line tracker circuit to sense vertical positioning of a character image on said array and to separate character strings which correspond with multiple lines of characters in the field of view of said sensor.

Claim 5

An optical character recognition system utilizing a hand-held wand for optically reading alphanumeric characters on a character field and automatically processing and transmitting the data to receiver and/or display devices, which comprises: a two-dimensional photo sensor array of height in cells greater than the array width in cells to produce optical images of each character as a set of electrical signals during horizontal relative movement between said wand and said field, means responsive to the electrical signals to produce one bit binary codes representing an image, means for storing the one bit binary codes as character segments and background segments, a blanking circuit means to inhibit multiple loading of a single character into said means for storing upon operating of the hand-held wand at a high frame rate and a low hand-swept velocity, and a line tracker circuit to sense vertical positioning of a character image on said array and to separate character strings which correspond with multiple lines of characters in the field of view of said sensor.

Claim 6

A hand-held operated character recognition system as set forth in claim 3 including a character string and storage analysis circuit to analyze nonnumeric characters in a character string to thereby accommodate sensing multiple data field.

Claim 7

The combination as set forth in claim 4 wherein said blanking circuit includes a down counter which is reset to a constant k whenever a character is recognized, where K corresponds to frames searched with no character being recognized.

Claim 8

The combination as set forth in claim 5 wherein a character is loaded into said character string and storage analysis circuit when the down counter identified with said circuit is in a zero count state.

Claim 9

The combination as set forth in claim 4 wherein: said character string and storage analysis circuit includes a plurality of character string storage registers, and said line tracker circuit means includes a counter and logic unit which provides a binary number VC corresponding to the vertical position of the character in the field of view, and includes means to identify each of said plurality of character string storage registers by binary number VN corresponding to the vertical positioning of the last character detected for that string, and includes means for determining whether a detected character is to be added to a given string by determining whether VN - VC is less than approximately one-half of the height of a character.

Claim 10

The combination as set forth in claim 3 including a counter for counting the number of characters recognized during one sweep across said field.

Claim 11

The combination as set forth in claim 3 including means for limit recognition of only a predetermined number of characters in a given sweep across said field.

Claim 12

The combination as set forth in claim 3 including means for establishing a time interval within which to recognize the first character during a given sweep across said field.

Claim 13

The combination as set forth in claim 3 including means responsive to the end of an initiated time interval to evaluate special character and character count acceptability to indicate success of a given sweep across said field.

Claim 14

The combination as set forth in claim 3 including means for setting a delay time and wherein a period exceeding the delay time without a character recognition occurring indicates the end of a character field.

Claim 15

An optical character recognition system utilizing a hand-held wand for optically reading alphanumeric characters on a character field and automatically processing and transmitting the data to receiver and/or display devices, which comprises: a two dimensional optical sensor in said hand-held wand to produce optical images of each said character as a set of electrical signals indicating black cells and white cells in said field during horizontal relative movement between said wand and said field, means responsive to the electrical signals to produce one bit binary codes indicating black cells and white cells in said field, means for storing the black cell and white cell binary codes, means for shifting the codes in said means for storing to simulate vertical movement of the wand relative to the field, means for processing the black cell codes and the white cell codes to provide an identification of the presence of a character image in the field, and means for attempting an identification of a character image between the shifting of the binary codes in said means for storing from a plurality of black cell codes and a plurality of white cell codes, the interval between each attempt of identification being related to the time required for the movement of said sensor a preset distance in said field.

Claim 16

An optical character recognition system utilizing a hand-held wand for optically reading alphanumeric characters on a character field and automatically processing and transmitting the data to receiver and/or display devices, which comprises: a two dimensional optical sensor in said hand-held wand to produce optical images of each said character as a set of electrical signals indicating black cells and white cells in said field during horizontal relative movement between said wand and said field, means responsive to the electrical signals to produce one bit binary codes indicating black cells and white cells in said field, means for storing the black cell and white cell binary codes, means for shifting the codes in said means for storing to simulate vertical movement of the wand relative to the field, means for processing the black cell codes and the white cell codes to provide an identification of the presence of a character image in the field, and means for attempting an identification of a character image between the shifting of the binary codes in said means for storing from a plurality of black cell codes and a plurality of white cell codes, the interval between each attempt of identification being related to the time required for the movement of said sensor a preset distance in said field.

Claim 17

The system of claim 13 including a counter for counting the number of characters recognized during one sweep across said field.

Claim 18

The system of claim 13 including means to limit recognition of only a predetermined number of characters in a given sweep across said field.

Claim 19

The system of claim 13 wherein display or transmission means respond to said means for identification to display in real time characters in said field.

Claim 20

The system of claim 16 wherein said display or transmission means is disabled unless a predetermined key symbol is recognized at a predetermined location in said field.

Claim 21

The combination as set forth in claim 13 including means for establishing a time interval within which to recognize the first character during a given sweep across said field.

Claim 22

The combination as set forth in claim 18 including means responsive to the end of an initiated time interval to evaluate special character and character count acceptability to indicate success of a given sweep across said field.

Claim 23

The combination as set forth in claim 13 including means for setting a delay time and wherein a period exceeding the delay time without a character recognition occurring indicates the end of a character field.

Claim 24

An optical character recognition system utilizing a hand-held wand for optically reading alphanumeric characters on a character field and automatically processing and transmitting the data to receiver and/or display devices, which comprises: a two dimensional optical sensor in said hand-held wand to produce optical images of each said character as a set of electrical signals indicating black cells and white cells in said field during horizontal relative movement between said wand and said field, means responsive to the electrical signals to produce one bit binary codes indicating black cells and white cells in said field, means for storing the black cell and white cell binary codes as black character segments and void segments, means for shifting the codes in said means for storing to simulate vertical movement of the wand relative to the field, means for combining the black segments and the void segments to provide an identification of the presence of a character image in the field, and means for attempting an identification of a character image between the shifting of the binary codes in said means for storing from a plurality of black segments and void segments, the interval between each attempt of identification being related to the time required for the movement of said sensor a preset distance in said field.

Claim 25

An optical character recognition system utilizing a hand-held wand for optically reading alphanumeric characters on a character field and automatically processing and transmitting the data to receiver and/or display devices, which comprises: a two dimensional optical sensor in said hand-held wand to produce optical images of each said character as a set of electrical signals indicating black cells and white cells in said field during horizontal relative movement between said wand and said field, means responsive to the electrical signals to produce one bit binary codes indicating black cells and white cells in said field, means for storing the black cell and white cell binary codes as black character segments and void segments, means for shifting the codes in said means for storing to simulate vertical movement of the wand relative to the field, means for combining the black segments and the void segments to provide an identification of the presence of a character image in the field, and means for attempting an identification of a character image between the shifting of the binary codes in said means for storing from a plurality of black segments and void segments, the interval between each attempt of identification being related to the time required for the movement of said sensor a preset distance in said field.

Claim 26

The combination set forth in claim 21 in which said sensor is an LS1 photosensing array.

Claim 27

The optical character recognition system as set forth in claim 21 wherein: said optical sensor is a two-dimensional array of photosensitive diodes, and said means for storing includes an array of nine serial-input-parallel-output registers of which one is 8 bits wide and 1 bit high while the other eight are 1 bit wide and 16 bits high to simulate the apparent vertical movement of said character image through said array in one cell height increments, and thereby accommodate vertical character misregistration between said sensor and characters in said field.

Claim 28

The combination set forth in claim 21 in which means are provided to enable system output utilization of signals from said means for identification only after K consecutive attempts in which no character recognition has occurred.

Claim 29

The combination as set forth in claim 21 wherein said means for combing said black segments and void segments includes logical OR circuits responsive to preset patterns of black segments or void segments.

Claim 30

The combination set forth in claim 21 in which said patterns comprise horizontal rows or vertical columns corresponding to subsets of said binary codes and wherein members in said horizontal rows or vertical columns are logically ORed to accommodate variations in angle, perspective and field depth during said movement across said field.

Claim 31

A hand operated optical character recognition system as set forth in claim 19 wherein a two-dimensional array of photosensitive diodes in said sensor is operated at a frame rate sufficiently high to preclude passage of a character past the field of view without the character being centered within the tolerance of the said system during at least one frame thereby to accommodate variable sweep velocity, variable character pitch and unknown direction of sweep and including: a blanking circuit means to inhibit multiple loading of a single character in said means for storing upon operating at a high frame rate and at low hand-swept velocity, a character string and storage analysis circuit means to analyze nonnumeric characters in a character string thereby to accommodate sensing multiple data fields, and a line tracker circuit means to sense vertical positioning of a character image on said array and to separate character strings which correspond with multiple lines of characters in the field of view of said sensor.

Claim 32

The combination as set forth in claim 27 wherein said blanking circuit includes a down counter which is reset to a constant K whenever a character is recognized, where K corresponds to frames searched with no character being recognized.

Claim 33

The combination of claim 27 wherein K is about 14.

Claim 34

The combination set forth in claim 27 wherein: said character string and storage analysis circuit means includes a plurality of character string storage registers, and said line tracker circuit means includes a counter and logic unit which provides a binary number V c corresponding to the vertical position of the character in the field of view, and includes means to identify each of said plurality of character string storage registers by binary number V n corresponding to the vertical positioning of the last character detected for that string, and includes means to determine whether a detected character is to be added to a given string by determining whether |V n - V c | is less than approximately one-half of the height of a character.

Claim 35

The combination as set forth in claim 27 including means for setting a specific time interval to be initiated upon recognition of the first character, and the expiration of said time interval constituting a decision that the scanning operation is complete.

Claim 36

The combination as set forth in claim 27 including means for setting a specific time interval to be initiated or reinitiated upon recognition of any character, and the expiration of said interval constituting a decision that the scanning operation is complete.

Claim 37

The system of claim 21 including a counter for counting the number of characters recognized during one sweep across said field.

Claim 38

The system of claim 21 including means to limit recognition of only a predetermined number of characters in a given sweep across said field.

Claim 39

The system of claim 21 wherein display or transmission means responds to said means for identification to display in real time characters in said field.

Claim 40

The system of claim 35 wherein said display or transmission means is disabled unless a predetermined key symbol is recognized at a predetermined location in said field.