Method and apparatus for processing coded image data

• US 5,563,966 A
• Filed: 07/13/1995
• Issued: 10/08/1996
• Est. Priority Date: 11/22/1991
• Status: Expired due to Term

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Ise, Hirotoshi, Ohara, Yoshihito
• Primary Examiner(s): Boudreau, Leo
• Assistant Examiner(s): Davis, Monica S.
• Application Number:
  US08/502,270
• Time in Patent Office: 453 Days
• Field of Search: 382/317, 382/232, 358/402, 358/403, 358/408
• US Class Current: 382/317
• CPC Class Codes: H04N 1/2166 for mass storage, e.g. in document filing systems information retrieval G06F16/00

Abstract

Coded image data are supplied in the order of page units, and each page of the input coded image data is examined without being decoded as to whether it includes a predetermined coded separator pattern. If a separator sheet is included, that page is recognized as the coded image data of a separator sheet, and if a separator sheet is not included, that page is recognized as the coded image data of a document. Therefore, the document fed before the separator sheet and the document fed after the separator sheet can be classified to belong to different groups, and thus registered in different regions of a memory, respectively. Since the coded image data of documents can be classified without being decoded, a plurality of documents to be classified can be supplied even from a facsimile or the like to and registered in an electronic image filing system at a high speed. Accordingly, it is possible to provide an electronic system capable of hanging the transmission condition in accordance with the result of the recognition of the different types of documents.

Claims

1. A method of processing and storing, in a coded form of a 2-dimensional compression-type sequential encoding scheme which has a plurality of encoding modes including a horizontal mode, a pass mode and a vertical mode, coded image data of human readable image data placed on a plurality of sheets, said sheets being designated into different groups by at least one separator sheet having a predetermined separator pattern thereon, comprising the steps of:

inputting, using an input apparatus, a plurality of blocks of input coded image data coded in said 2-dimensional compression-type sequential encoding scheme, and corresponding to said plurality of sheets;

examining, by a processor, which one of said plurality of encoding modes matches a compressively coded pattern of each code unit of said input coded image data, and calculating an occurrence frequency of each of said encoding modes in each data block of said input coded image data;

deciding, by said processor, if a frequency distribution of said occurrence frequency of said encoding modes in a data block of said input coded image data matches with a predetermined frequency distribution adopted for said predetermined separator pattern; and

recognizing, by said processor, a presence of said predetermined separator pattern when the frequency distribution of said encoding modes in said data block is matched with that of said predetermined separator pattern, so that said processor manages and stores said coded image data separated before and after said matched block as different groups in a memory apparatus.

2. A method of processing and storing coded image data according to claim 1, wherein said predetermined separator pattern is image data of a pattern which is different from image data corresponding to a margin space of a document.

3. A method of processing and storing coded image data according to claim 2, wherein said predetermined separator pattern includes at least two substantially slant lines.

4. A method of processing and storing coded image data according to claim 1, wherein said predetermined separator pattern includes a combination of marks which have a potential to appear in said coded image data at a small probability in said coded form.

5. An apparatus for processing and storing in a coded form of a 2-dimensional compression-type sequential encoding scheme which has a plurality of encoding modes including a horizontal mode, a pass mode and a vertical mode, coded image data of human readable image data placed on a plurality of sheets, said sheets being designated into different groups by at least one separator sheet having a predetermined separator pattern thereon, comprising:

a means for inputting a plurality of blocks of input coded image data coded in said two dimensional compression-type sequential encoding scheme, and corresponding to said plurality of sheets;

a means for examining which one of said plurality of encoding modes matches a compressively coded pattern of each code unit of said input coded image data, and calculating an occurrence frequency of each of said encoding modes in each data block of said input coded image data;

a means for deciding if a frequency distribution of said occurrence frequency of said occurrence frequency of said encoding modes in a data block of said input coded image data matches with a predetermined frequency distribution adopted for said predetermined separator pattern; and

a means for recognizing a presence of said predetermined separator pattern when the frequency distribution of said encoding modes in said data block is matched with that of said predetermined separator pattern; and

a processor which, in response to a matched unit found in said means for deciding, manages and stores said coded image data separated before and after said matched data block as different groups in a storage apparatus.

6. An apparatus for processing and storing coded image data according to claim 5, wherein said predetermined separator pattern is image data which is different from image data corresponding to a margin space of a document.

7. An apparatus for processing and storing coded image data according to claim 6, wherein said predetermined separator pattern includes at least two substantially slant lines.

8. An apparatus for processing coded image data according to claim 5, wherein said predetermined separator pattern includes a combination of marks which have a potential to appear in said coded image data at a small probability in said coded form.