منابع مشابه
Multi-Level Halftoning by IGS Quantization
Improved gray-scale (IGS) quantization is a known method for re-quantizing digital gray-scale images for data compression while producing halftones by adding a level of randomness to improve visual quality of the resultant images. In this paper, first, analyzing the IGS quantizing operations reveals the capability of conserving a DC signal level of a source image through the quantization. Then,...
متن کاملMulti-level Colour Halftoning Algorithms
Methods for the halftoning of images on multi-level printing devices such as multi-level inkjet printers are presented. Due to the relatively large size of single droplets, halftoning algorithms are still needed. However, since halftoning occurs between the basic levels attainable by printing one, two or several droplets at the same position, artefacts are less visible than in equal resolution ...
متن کاملMulti - Level Colour Halftoning Algorithms 1
Methods for the halftoning of images on multi-level printing devices such as multi-level inkjet printers are presented. Due to the relatively large size of single droplets, halftoning algorithms are still needed. However, since halftoning occurs between the basic levels attainable by printing one, two or several droplets at the same position, artefacts are less visible than in equal resolution ...
متن کاملMulti-Class Electrostatic Halftoning
Electrostatic halftoning, a sampling algorithm based on electrostatic principles, is among the leading methods for stippling, dithering, and sampling. However, this approach is only applicable for a single class of dots with a uniform size and colour. In our work, we complement these ideas by advanced features for real-world applications. We propose a versatile framework for colour halftoning, ...
متن کاملParallel BTF Compression with Multi-Level Vector Quantization in OpenCL
Bidirectional Texture Function (BTF) as an effective visual fidelity representation of surface appearance is becoming more and more widely used. In this paper we report on contributions to BTF data compression for multi-level vector quantization. We describe novel decompositions that improve the compression ratio by 15% in comparison with the original method, without loss of visual quality. Fur...
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ژورنال
عنوان ژورنال: Journal of Signal and Information Processing
سال: 2013
ISSN: 2159-4465,2159-4481
DOI: 10.4236/jsip.2013.44044