1 July 1992 Applicability of a standardized discrete cosine transform coding method to character images
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J. of Electronic Imaging, 1(3), (1992). doi:10.1117/12.59983
Abstract
The Joint Photographic Experts Group (JPEG) baseline system, which is scheduled to be standardized in 1992, is applied to character images, and the characteristics of the application are investigated. The JPEG system is suitable for continuous-tone images, however, continuous-tone images are usually accompanied by characters. The image quality of characters is investigated on various magnitudes of quantization tables and the deterioration mechanisms are discussed. A method of image quality improvement that is accomplished by density transformation after decoding is proposed and its effects are confirmed.
Yasushi Hoshino, Dai Ando, Suguru Higashino, Masaki Tsukamoto, "Applicability of a standardized discrete cosine transform coding method to character images," Journal of Electronic Imaging 1(3), (1 July 1992). http://dx.doi.org/10.1117/12.59983
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KEYWORDS
Quantization

Image compression

Image quality

Signal to noise ratio

Image processing

Image quality standards

Fourier transforms

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