In this paper, a novel individual source scanner identification scheme is proposed. The scheme uses traces of dust, dirt, and scratches over scanner platen on scanned images to characterize a source scanner. The efficacy of the proposed scheme is substantiated with experimental analysis. The robustness of the scheme to the JPEG compression is also investigated. Experimental results show that pr...

We discuss the basic theory of price indices. These form the basis for the Consumer Price Index in the United States. We note situations which can lead to non-robustness and volatility in several different price indices. An experiment to replace survey-based data with point of sales (POS) scanner data is being carried out. We visually explore the scanner data and conclude that certain aspects o...