Abstract: For order dithering halftone images, an inverse halftoning algorithm based on Laplacian pyramid is proposed. With the idea of dividing and treating respectively, Laplacian pyramid is used to transform the halftone image into low-frequency information and high-frequency information. To improve the quality of inverse halftoning image, filter banks are employed to remove the noise and at the same time preserve the edges. Experiments show that the proposed algorithm has the advantages of low implementation cost and high peak signal-to-noise ratio.

Key words: inverse halftoning, order dithering, Laplacian pyramid, filter banks

摘要： 针对有序抖动半调图，提出一种基于Laplacian金字塔的逆半调方法。采用分治策略，利用Laplacian金字塔变换将图像分成低频和高频区域，通过滤波器组抑制高频噪声，同时保持图像边缘，改善逆半调图像的质量。实验证明，该算法具有时空复杂度较低、峰值信噪比高等特点。

关键词: 逆半调, 有序抖动, Laplacian金字塔, 滤波器组

CLC Number: 

• TP301.6