Method and apparatus for automatic recognition of image and text or graphics areas on printed masters
First Claim
1. A method for automatically recognizing and distinguishing between image areas and text or graphics areas a printed master comprising the steps of:
- optoelectronically scanning said printed master and generating analog signals representing the information contained on said printed master;
assigning a first binary value to analog signals having a value above a preselected value and assigning a second binary value to analog signals falling below said preselected value;
storing said binary values in a data field in a memory;
dividing said data field into a grid consisting of a plurality of windows in said memory, said windows having edge lengths which are not less than the spacing between two lines of text on said printed master;
generating four different length of run histograms for each said window; and
analyzing said length of run histograms for deriving values therefrom for determining whether the window associated therewith represents a text or graphics area or an image area of said printed master.
1 Assignment
0 Petitions
Accused Products
Abstract
A method and apparatus for automatically recognizing the presence of an image area and a text or graphics area on a printed master which is being examined for determination of the textual content thereof employ an optoelectronic video scanner, the scanned values obtained therefrom being digitized and stored in a memory. The input master is schematically divided into small overlapping windows and a number of length of run histograms are generated by a computer for each such window. The particular characteristics of each of the histograms are examined for determination as to whether the histograms correspond to a text or graphics area or an image area of printed material on the master.
-
Citations
8 Claims
-
1. A method for automatically recognizing and distinguishing between image areas and text or graphics areas a printed master comprising the steps of:
-
optoelectronically scanning said printed master and generating analog signals representing the information contained on said printed master; assigning a first binary value to analog signals having a value above a preselected value and assigning a second binary value to analog signals falling below said preselected value; storing said binary values in a data field in a memory; dividing said data field into a grid consisting of a plurality of windows in said memory, said windows having edge lengths which are not less than the spacing between two lines of text on said printed master; generating four different length of run histograms for each said window; and analyzing said length of run histograms for deriving values therefrom for determining whether the window associated therewith represents a text or graphics area or an image area of said printed master. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. An apparatus for automatically recognizing text or graphics areas and image areas on a printed master comprising:
-
a means for optoelectronically scanning said printed master for generating analog signals corresponding to the information carried thereon; a means for converting said analog signals into binary signals; a memory for storing said binary signals in a data field, said memory having a grid having a plurality of windows therein superimposed on said data field; a means for generating four different length of run histograms from the binary signals contained in each said window in said memory; and a means for analyzing said length of run histograms and generating evaluation values associated therewith, said evaluation values determining whether a text or graphics area or an image area is present in the window associated with said length of run histograms.
-
Specification