Method for compressing and decompressing forms by means of very large symbol matching
First Claim
1. Method for compressing, for storing or transmitting, information contained in filled-in forms by separate handling of the corresponding empty forms and of the information written into them, characterized by the steps of:
- pre-scanning the empty forms, digitizing data obtained, and storing digitized representations relating to each of the empty forms in a computer memory to create a form library,scanning the original, filled-in form to be compressed, digitizing data obtained from the filled in form,identifying a particular one of said empty forms in said forms library and retrieving the digital representation thereof,subtracting said retrieved digital representation of the empty form from said digital representation of the scanned filled-in form, to generate a difference which is a digital representation of the filled-in information, andcompressing the digital representation of the filled-in information.
1 Assignment
0 Petitions
Accused Products
Abstract
This method relates to the compression of information contained in filled-in forms (O) by separate handling of the corresponding empty forms (CP) and of the information written into them (VP). Samples of the empty forms are pre-scanned, the data obtained digitized and stored in a computer memory to create a forms library. The original, filled-in form (O) to be compressed is then scanned, the data obtained digitized and the retrieved representation of the empty form (CP) is then subtracted, the difference being the digital representation of the filled-in information (VP), which may now be compressed by conventional methods or, preferably, by an adaptive compression scheme using at least two compression ratios depending on the relative content of black pixels in the data to be compressed.
68 Citations
13 Claims
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1. Method for compressing, for storing or transmitting, information contained in filled-in forms by separate handling of the corresponding empty forms and of the information written into them, characterized by the steps of:
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pre-scanning the empty forms, digitizing data obtained, and storing digitized representations relating to each of the empty forms in a computer memory to create a form library, scanning the original, filled-in form to be compressed, digitizing data obtained from the filled in form, identifying a particular one of said empty forms in said forms library and retrieving the digital representation thereof, subtracting said retrieved digital representation of the empty form from said digital representation of the scanned filled-in form, to generate a difference which is a digital representation of the filled-in information, and compressing the digital representation of the filled-in information. - View Dependent Claims (2, 3, 4, 5, 13)
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6. Method for compressing, for storing or transmitting, information contained in filled-in forms by separate handling of empty forms and of information written into them, characterized by the steps of:
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pre-scanning the empty forms, digitalizing data obtained by pre-scanning the empty forms, and storing the digitized representations relating to each of the empty forms in a computer memory to create a forms library; scanning an original, filled-in form to be compressed, digitizing data obtained from scanning the filled-in form, identifying a particular one of said empty forms in said forms library and retrieving a digital representation thereof; using dimensionality reduction to determine registration information relating to relative position of the filled-in information with respect to the competed form; registering said original filled-in form with said empty form; subtracting said retrieved representation of the empty form from said digital representation of the scanned filled-in form, a difference being the digital representation of the filled-in information, and compressing the digital representation of the filled-in information.
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7. Method for compressing, for storing or transmitting, and reproducing information contained in filled-in forms by separate handling of corresponding empty forms and of information written into them, characterized by the steps of:
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(a) storing digitized representations of empty forms in a computer memory to create a forms library; (b) scanning an original, filed in form to be compressed; (c) digitizing data obtained from said filled-in form; (d) identifying the particular one of said empty forms in said forms library and retrieving the digital representation thereof; (e) subtracting said retrieved digital representation of the empty form from said digital representation of the scanned filled-in form, to generate a difference which is a digital representation of the filled-in information, and (f) compressing the digital representation of the filled-in information. - View Dependent Claims (8)
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9. Method for compressing, for storing, or transmitting, information contained in filled-in forms by separate handling of corresponding empty forms and of information written into them, characterized by the steps of:
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pre-scanning the empty forms, digitizing data obtained from pre-scanning the empty forms, and storing a digitized representations relating to each of the empty forms in a computer memory to create a forms library; scanning an original, filled-in form to be compressed, digitizing data obtained from scanning the filled in form; identifying a particular one of said empty forms in said forms library and retrieving the digital representation thereof; determining registration information relating to a relative position of the filled-in information with respect to a completed form; partitioning the scanned filled-in form into small segments; estimating, for each segment, optimum shifts to be performed in x and y directions; placing each segment of said original filled-in form at an appropriate area of an output image array using the shift information previously established, so that a complete, shifted image is obtained when placements for all segments have been completed; subtracting said retrieved representation of the empty form from said digital representation of the scanned filled-in form, a difference being the digital representation of the filled information, and compressing the digital representation of the filed in information. - View Dependent Claims (10, 11, 12)
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Specification