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Digital image processing. I. Evaluation of gray level correction methods in vitro . by I. Fourmousis; U. Brägger; W. Bürgin; M. Tonetti; N. P. Lang is a Dentistry article available to read on EtoBox.

What is Digital image processing. I. Evaluation of gray level correction methods in vitro . about?

The aims of this study were a) to assess in an in vitro model the amount of density changes measured in digitally subtracted images due to electronic noise and image alignment error, and b) to test the accuracy of different gray level correction procedures in the reduction of densitometric image mismatches. A section of a pig mandible in which a hollow cylinder ITI Bonefit® implant had been placed was used to obtain pairs of standardized radiographs. Series of radiographs were obtained with different exposure times (0.34, 0.39, 0.44, 0.51, 0.58 s). The radiographs were captured through a video camera, digitized and stored in a personal computer. The same radiographic image was recorded and subtracted from itself 10 times to study the error of the method due to electronic transformations of the images and image alignment. The noise due to the analog‐to‐digital transformation of the radiographic images was calculated to be +2 gray levels i.e., 2% of the scale of gray levels. This kind of error was reduced up to 40% by capturing the images more than once and averaging the values per pixel. The manual superimposition of the images to be subtracted caused an increase of the error to ±3

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Author

I. Fourmousis; U. Brägger; W. Bürgin; M. Tonetti; N. P. Lang

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley (ISSN 0905-7161)

Published

1994

Language

EN

Field

Dentistry (Health Sciences)