Davor Donevski

Colorimetrically accurate gray component replacement using the additive model

New gray component replacement method for use in four color printing is developed.The methods performance is tested on a large dataset and image database.The method achieves great ink saving while preserving the visual appearance.Further research key points for improving the methods versatility are identified. In four color printing, gray component replacement (GCR) is a method of replacing the achromatic component of a mixture of chromatic inks by a corresponding amount of the achromatic ink. Simple approaches to GCR lead to unacceptable color shifts. In this paper, the method using multiple processing steps is proposed. The novelty of the proposed method is augmentation of masking equations, which allows finding solutions for a pre-set amount of the black ink. The method performance was evaluated and compared with state of the art commercial solution. The experiments have shown that the proposed model is on average capable of achieving 4055% ink savings with median colorimetric difference of less than 0.3, thus preserving the visual appearance of images.

Applicability of the GCR masking in an image watermarking method

There exist continuous effort to develop new or improve existing watermarking methods. The main goal of this paper is to give preliminary insight of the applicability of the Gray Component Replacement (GCR) masking to frequency domain based watermarking scheme. The use of GCR masking can potentially increase the performance of a watermarking method by improving robustness or imperceptibility of an embedded watermark. The applicability of GCR masking is tested by extending well known watermarking method with GCR masking capability and comparing the imperceptibility of the embedded watermark before and after GCR masking. Results show that GCR masking can substantially increase the PSNR value of the watermarked image.

Implementacija diferenciranog sustava upravljanja kvalitetom i FMEA metode u novinsku proizvodnju

Original scientific paper A new approach to the FMEA (Failure Mode and Effects Analysis analysis of potential failures and their effects) method implementation in the newspaper production system shows non-compliances that may occur in the selected processes by implementing differentiated quality management system. Each sub-process and work activity within the selected processes in the newspaper production is differentially evaluated, and analysis provides the necessary information about the intensity of occurrence, severity and possible corrective actions in order to achieve and maintain high levels of quality newspaper products. FMEA analysis is presented in the modified tables for the newspaper product production process, and the preventive and corrective actions were recommended based on the results obtained. By performing preventive and corrective actions the occurrence of non-compliance is eliminated or minimized which ultimately makes the process more competitive and removes the non-compliance from the product.