Abstract
Look-up table (LUT) based method is a popular and effective way for inverse halftoning. However, it still has very large development space to improve the reconstructed color image quality for color halftone images, because most of the existing color inverse halftoning methods are the simple extension of LUT methods to each color components separately. To this end, this paper presents a novel color inverse halftoning method by exploiting the correlation of multi-color components. Through considering all existent contone values with the same halftone pattern in three color component tables, we firstly propose a concept of common pattern. Then the extreme learning machine (ELM) is employed to estimate the contone values for nonexistent patterns according to common patterns in color LUT, which can not only improve the fitting precision of nonexistent values but also has fast transformation speed. Experimental results show that the proposed method achieves a better image quality when compared to previously published methods.
Highlights
Digital halftoning is a special technique of converting a continuous image into a binary image, which is widely used in many fields, such as printing industry, textile industry and the electronic display field [1,2]
In view of the same color halftone patterns corresponding to the similar values of the R, G, B planes as shown in Figure 1, we propose a novel color inverse halftoning method, Appl
Due to scarce research on color inverse halftoning in published literature, we mainly compare dataset used in reference [14] is employed to build look-up tables which include thirty real-life the proposed method with the one proposed by Mese et al in reference [14]
Summary
Digital halftoning is a special technique of converting a continuous image into a binary image, which is widely used in many fields, such as printing industry, textile industry and the electronic display field [1,2]. The low-pass filtering is a simple and fast inverse halftoning method, it can remove most of the noise in the reconstructed continuous tone image. [14], most of the existing color inverse halftoning methods are a simple extension of the look-up table (LUT) method to each color planes separately Since these color inversing methods cannot consider the correlation between the color planes, they lead to a poor quality of color continuous-tone images.
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