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Hangul Bitmap Data Compression Embedded in TrueType Font  

Han Joo-Hyun (숭실대학교 컴퓨터학과)
Jeong Geun-Ho (숭실대학교 컴퓨터학과)
Choi Jae-Young (숭실대학교 컴퓨터학과)
Publication Information
Journal of KIISE:Software and Applications / v.33, no.6, 2006 , pp. 580-587 More about this Journal
Abstract
As PDA, IMT-2000, and e-Book are developed and popular in these days, the number of users who use these products has been increasing. However, available memory size of these machines is still smaller than that of desktop PCs. In these products, TrueType fonts have been increased in demand because the number of users who want to use good quality fonts has increased, and TrueType fonts are of great use in Windows CE products. However, TrueType fonts take a large portion of available device memory, considering the small memory sizes of mobile devices. Therefore, it is required to reduce the size of TrueType fonts. In this paper, two-phase compression techniques are presented for the purpose of reducing the sire of hangul bitmap data embedded in TrueType fonts. In the first step, each character in bitmap is divided into initial consonant, medial vowel, and final consonant, respectively, then the character is recomposed into the composite bitmap. In the second phase, if any two consonants or vowels are determined to be the same, one of them is removed. The TrueType embedded bitmaps in Hangeul Wanseong (pre-composed) and Hangul Johab (pre-combined) are used in compression. By using our compression techniques, the compression rates of embedded bitmap data for TrueType fonts can be reduced around 35% in Wanseong font, and 7% in Johab font. Consequently, the compression rate of total TrueType Wanseong font is about 9.26%.
Keywords
TrueType Font; Bitmap; Hangul Compression;
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