Development of watermark quality measurement by image analysis.Application: An emerging technological method of analyzing watermarks could replace visual methods as the commonly accepted way to assess and compare the quality of watermarks. The time-honored way to assess the quality of a watermark watermark: see paper. See digital watermark. is to scrutinize scru·ti·nize tr.v. scru·ti·nized, scru·ti·niz·ing, scru·ti·niz·es To examine or observe with great care; inspect critically. scru a sample with light shining through it. Relying on this traditional method means that papermakers and their customers have had to depend on expert opinions. A technological means by which to assess watermarks would give us a common measure of quality. A new technology is emerging for measuring the quality of watermarks based on the same image analysis techniques used to study paper formation. A sample watermark is aligned with a reference image, and the quality of the match is analyzed an·a·lyze tr.v. an·a·lyzed, an·a·lyz·ing, an·a·lyz·es 1. To examine methodically by separating into parts and studying their interrelations. 2. Chemistry To make a chemical analysis of. 3. with a special camera. The attributes quantified are the watermark intensity and the sharpness difference, both measured as percentages. Another quantity, the intensity ratio, is found by dividing the percent intensity of the sample image by the percent intensity of the reference image. The intensity and sharpness of a watermark image must be analyzed against the background of sheet formation. Poor sheet formation can obliterate o·blit·er·ate v. 1. To remove an organ or another body part completely, as by surgery, disease, or radiation. 2. To blot out, especially through filling of a natural space by fibrosis or inflammation. watermark quality to the point at which visual assessment is questionable. In the image analysis approach, graphics soft ware ware See Groupware, Hardware, Shareware, Software. is used to factor out the effects of paper formation Measurements of the watermark intensity and sharpness relative to a reference correlated well with the results of visual testing. However, the technological method has the advantages of being faster and more precise. Trepanier and Perron Per´ron n. 1. (Arch.) An out-of-door flight of steps, as in a garden, leading to a terrace or to an upper story; - usually applied to mediævel or later structures of some architectural pretensions. are with OpTest Equipment Inc., 900 Tupper St., Hawkesbury, ON, K6A 3S3, Canada. Email Trepanier at trepanier@optest.ca. |
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