A Quantization Method of Line Drawings using Directional-Difference Codes with Adaptive Line Segments.
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| Title: | A Quantization Method of Line Drawings using Directional-Difference Codes with Adaptive Line Segments. |
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| Authors: | Ishii, Ikuo1 |
| Source: | Systems & Computers in Japan. Aug87, Vol. 18 Issue 8, p67-76. 10p. |
| Subjects: | LINDA (Computer system), Optical pattern recognition, Information retrieval, Curves, Geometry, Mathematics |
| Abstract: | This paper proposes a highly efficient coding method suited to the storage and transmission of complicated line drawings such as topographical map. Instead of using the method based on the fixed-length segment such as Freeman's chain code, the segment length is made variable according to the state of the curve. The high efficiency is realized by further adding the directional- difference code. in the method employing variable-length segment, there is a danger that the approximate error is increased with the length of the segment. Consequently, a scheme is employed in which the permissible error is specified, and the coding is performed within the error limit. To simplify the encoding procedure, several quantization templates are prepared with different segment lengths, and the approximating segment is selected by taking the template according to the state of the curve. Avoiding the increase of coding complexity by adding the template discrimination code the template to be used is selected based on the code sequence generated in the past. By this scheme, although depending on the complexity of the line drawing, the coding complexity can be reduced by 25 to 40 percent considering only the effect of variable segment length. [ABSTRACT FROM AUTHOR] |
| Copyright of Systems & Computers in Japan is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Links: – Type: pdflink Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 14003507 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: A Quantization Method of Line Drawings using Directional-Difference Codes with Adaptive Line Segments. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Ishii%2C+Ikuo%22">Ishii, Ikuo</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Systems+%26+Computers+in+Japan%22">Systems & Computers in Japan</searchLink>. Aug87, Vol. 18 Issue 8, p67-76. 10p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22LINDA+%28Computer+system%29%22">LINDA (Computer system)</searchLink><br /><searchLink fieldCode="DE" term="%22Optical+pattern+recognition%22">Optical pattern recognition</searchLink><br /><searchLink fieldCode="DE" term="%22Information+retrieval%22">Information retrieval</searchLink><br /><searchLink fieldCode="DE" term="%22Curves%22">Curves</searchLink><br /><searchLink fieldCode="DE" term="%22Geometry%22">Geometry</searchLink><br /><searchLink fieldCode="DE" term="%22Mathematics%22">Mathematics</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: This paper proposes a highly efficient coding method suited to the storage and transmission of complicated line drawings such as topographical map. Instead of using the method based on the fixed-length segment such as Freeman's chain code, the segment length is made variable according to the state of the curve. The high efficiency is realized by further adding the directional- difference code. in the method employing variable-length segment, there is a danger that the approximate error is increased with the length of the segment. Consequently, a scheme is employed in which the permissible error is specified, and the coding is performed within the error limit. To simplify the encoding procedure, several quantization templates are prepared with different segment lengths, and the approximating segment is selected by taking the template according to the state of the curve. Avoiding the increase of coding complexity by adding the template discrimination code the template to be used is selected based on the code sequence generated in the past. By this scheme, although depending on the complexity of the line drawing, the coding complexity can be reduced by 25 to 40 percent considering only the effect of variable segment length. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Systems & Computers in Japan is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1002/scj.4690180807 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 10 StartPage: 67 Subjects: – SubjectFull: LINDA (Computer system) Type: general – SubjectFull: Optical pattern recognition Type: general – SubjectFull: Information retrieval Type: general – SubjectFull: Curves Type: general – SubjectFull: Geometry Type: general – SubjectFull: Mathematics Type: general Titles: – TitleFull: A Quantization Method of Line Drawings using Directional-Difference Codes with Adaptive Line Segments. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Ishii, Ikuo IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 08 Text: Aug87 Type: published Y: 1987 Identifiers: – Type: issn-print Value: 08821666 Numbering: – Type: volume Value: 18 – Type: issue Value: 8 Titles: – TitleFull: Systems & Computers in Japan Type: main |
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