Lossy Coding of Error Diffused Images—Comparison of Lossy Multi-level Image Transmission and Number of Black Pixels Transmission

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  • 誤差拡散画像の非可逆符号化の検討—多値画像伝送方式と黒画素数伝送方式の提案と比較
  • 誤差拡散画像の非可逆符号化の検討--多値画像伝送方式と黒画素数伝送方式の提案と比較
  • ゴサ カクサン ガゾウ ノ ヒカギャク フゴウカ ノ ケントウ タチ ガゾウ デンソウ ホウシキ ト クロ ガソスウ デンソウ ホウシキ ノ テイアン ト ヒカク

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Abstract

The lossy coding scheme of error diffused images is an interesting topic but has not been studied well yet. In this paper we study two different categories. First one is to use multi-level lossy image coding methods such as JPEG, JPEG-LS and JPEG2000 including reduction and enlargement processing. The other category is to send the number of black pixels in plural pixels, and we studied the simplest case of sending three levels in two pixels. Among the former category, we found that JPEG2000 achieves best, and compared the SNR of inversed halftone images at the same bit rate with the latter. Then it is shown that the first category works better for the low-frequency dominated images and the second one works better for the high-frequency dominated images.

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