Image encoder, image decoder, character checker, and data storage medium

An image encoding and decoding device technology, applied in the field of data storage media, can solve the problems of deterioration of encoding efficiency, increase of data volume, redundant text data, etc.

Inactive Publication Date: 2004-12-01
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, in the conventional document file device 3900 having the above configuration, the encoding process of the document image data Di by the image encoding section 3902 is independent of the type of characters included in the document image, or is irrelevant to the type of characters included in the document image. Regardless of the type of document image components such as text, pictures, and photos, it is performed in the same way, so there is a problem that the coding efficiency deteriorates depending on the situation.
[0014] In addition, in the character recognition unit 3901 of the conventional document file device 3900, character codes of a plurality of candidate characters are output for each character included in the document image through character recognition processing for each character included in the document image. However, in general, there is a tendency to include characters corresponding to characters with very similar character shapes among the plurality of character candidates obtained from the structure of character recognition for one character.
In other words, if one candidate character (usually the first candidate character) is known, then other candidate characters can be deduced by analogy. Therefore, as described above, a plurality of candidate character codes will be derived through character recognition of each character, thereby The text data obtained through text recognition will become very lengthy and the amount of data will increase greatly

Method used

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  • Image encoder, image decoder, character checker, and data storage medium
  • Image encoder, image decoder, character checker, and data storage medium
  • Image encoder, image decoder, character checker, and data storage medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0228] figure 1 It is a block diagram showing the configuration of the image coding apparatus according to Embodiment 1 of the present invention.

[0229] The image encoding device 100 of the first embodiment is a device that receives document image data Di obtained by digitizing a document image 101 including bold characters by a scanner or the like, and encodes the document image data Di, and can be used, for example, as Figure 39 The image encoding unit 3902 of the illustrated document document composition apparatus 3900 is used. Here, the document image includes, as its partial images, characters and symbols, or a character image composed of a part of the characters and symbols, and character data is associated with each character image. Here, the reason why it is stipulated that the above-mentioned document image includes a character image composed of part of characters and symbols is that each part of one character or symbol may be recognized as one character or symbol...

Embodiment 2

[0295] figure 2 is a block diagram showing the configuration of an image coding apparatus according to Embodiment 2 of the present invention.

[0296] The image encoding device 200 of the second embodiment can be used as an information processing device for storing and sending and receiving image information, for example, as Figure 39 The illustrated document document layout device 3900 is used for an image coding unit of an electronic device such as a facsimile device having a scanner.

[0297] The image encoding device 200 of the second embodiment has the functions of receiving document image data (binary image data obtained by digitizing the document image 201 by a scanner or the like) Di and extracting the document image data shown in FIG. 24(b) from the document image data Di. The image feature extraction unit 202 of the character data Dc composed of the code string 2400 shown in the figure. The image feature extracting unit 202 is a character recognition device that p...

Embodiment 3

[0309] image 3 is a block diagram for explaining an image decoding apparatus according to Embodiment 3 of the present invention.

[0310] The image decoding device 300 in Embodiment 3 is a decoding device corresponding to the image encoding device 100 or 200 in Embodiment 1 or 2 above, and can be used as Figure 39 The illustrated document document composition device 3900 or the image decoding unit in the facsimile device is used.

[0311] That is, the image decoding device 300 receives the coded data De and the character data Dc output from the image coding device 100 or 200 of the first or second embodiment, decodes the coded data De based on the character data Dc, and converts the coded data De to the document image. Document image data Di corresponding to document image 301 is restored to decoded data Dd corresponding to document image 307 .

[0312] Next, a detailed description will be given. The image decoding device 300 of the third embodiment receives character data...

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Abstract

An image encoder has image feature extracting means (202) for generating, as shown in the Figure, text data Dc including character codes corresponding to respective text images contained in a document image (201) and auxiliary information on the sizes and positions of the text images based on image data Di on the document image (201). Based on the text data Dc, a predicted document image (205) of the document image (201) is formed, and an arithmetic encoding for changing an event probability model of the document image data Di is performed with reference to the predicted document image data PDi. Thus, the event probabilities of white and black pixels represented by an event probability model are nearly equal to the respective probabilities of white and black pixels in a text image, and the efficiency of the encoding of the text image data by an arithmetic encoder is improved.

Description

technical field [0001] The present invention relates to an image encoding device, an image decoding device, and a data storage medium, and in particular to efficiently encoding and storing binary image data obtained by digitizing document image data, that is, document images (images including characters) using a scanner or the like. Encoding processing for transmission or storage, decoding processing corresponding thereto, and a data storage medium storing a program for causing a computer to perform these processings. Background technique [0002] In addition, the present invention relates to a character collation device and a data storage medium, and in particular, a character image (image representing a character) to be searched is collated with input search data without decoding the corresponding coded data (character image code). The collation process and the data storage medium storing the program for causing the computer to perform the collation process. [0003] Hith...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T9/00H04N1/417
CPCG06T9/004H04N1/417
Inventor 松川善彦今川太郎目片强司畑幸一荣藤稔
Owner PANASONIC CORP
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