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Improving the Efficiency in Halftone Image Generation Based on Structure Similarity Index Measurement
Aroba KHAN Hernan AGUIRRE Kiyoshi TANAKA
IEICE TRANSACTIONS on Information and Systems
Publication Date: 2012/10/01
Online ISSN: 1745-1361
Print ISSN: 0916-8532
Type of Manuscript: PAPER
Category: Image Processing and Video Processing
structure aware halftoning, SSIM, pixel-swapping, objective function, phase block-shifting, bit-climbing algorithm,
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This paper presents two halftoning methods to improve efficiency in generating structurally similar halftone images using Structure Similarity Index Measurement (SSIM). Proposed Method I reduces the pixel evaluation area by applying pixel-swapping algorithm within inter-correlated blocks followed by phase block-shifting. The effect of various initial pixel arrangements is also investigated. Proposed Method II further improves efficiency by applying bit-climbing algorithm within inter-correlated blocks of the image. Simulation results show that proposed Method I improves efficiency as well as image quality by using an appropriate initial pixel arrangement. Proposed Method II reaches a better image quality with fewer evaluations than pixel-swapping algorithm used in Method I and the conventional structure aware halftone methods.