Evaluating noise in digitized radiographic images by means of histogram

To evaluate the performance of three digital devices regarding the noise added to digital radiographic images containing different optical densities. A radiographic image was digitized repeatedly ten times using two scanners (HP 4c/T and HP 5370C) and a digital camera (Nikon 990). A histogram tool m...

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Bibliographic Details
Published in:Journal of applied oral science 2006-12, Vol.14 (6), p.410-414
Main Authors: Rubira-Bullen, Izabel Regina Fischer, Escarpinati, Maurício Cunha, Schiabel, Homero, Vieira, Marcelo Andrade da Costa, Rubira, Cássia Maria Fischer, Lauris, José Roberto Pereira
Format: Article
Language:English
Subjects:
DENTISTRY, ORAL SURGERY & MEDICINE
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Summary:To evaluate the performance of three digital devices regarding the noise added to digital radiographic images containing different optical densities. A radiographic image was digitized repeatedly ten times using two scanners (HP 4c/T and HP 5370C) and a digital camera (Nikon 990). A histogram tool measured a mean pixel value and the standard deviation of the region of interest in each image. Both values were used to calculate the image noise at the different optical densities. The noise values found were different for all devices and optical densities. There was a statistically significant difference (p
ISSN:1678-7757
1678-7765
1678-7765
1678-7757
DOI:10.1590/S1678-77572006000600005