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Digitization at the CEB

Digitization of the NHANES Radiographs

The NHANES radiographs have been scanned by Dr. Bernie Huang at the University of California at Los Angeles and the University of California at San Francisco. Dr. Huang's group used a Lumysis 100 with a 175 micron spot to scan the first 6000 radiographs. The remaining radiographs will be scanned on the Lumysis 150 again with a 175 micron spot size.

The radiographs are transferred from the Lumysis scanner internal disk to a SUN Sparc Classic LX via FTP. Once on the SUN, the quality control technician checks each image to insure that it passes stage-1 of the National Center for Health Statistics three-tiered quality control process. After the images have passed quality control, they are transferred to an erasable optical platter storage and transport to NCHS. NCHS then conducts stage-2 and stage-3 quality control on the images. Any image failing stage 1 is redigitized; any image failing stage 2 or 3 is tagged as failing quality control.

Digitization of Rare Manuscripts

These images were digitized using a Ricoh FS1 flat-bed scanner. Scanning was done at 24 bits per pixel at a spatial resolution of 120 dots per inch. Portrait-type pages were scanned over an area of 8x10 inches; landscape-type pages were scanned over an area of 7.5x6 inches. The images were stored in Sun rasterfile format, uncompressed, resulting in file sizes of about 3.5 MB and 1.9 MB, respectively. GIF versions of the files have also been created, using the program xv to do the file conversions.
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URL: http://archive.nlm.nih.gov/repos/digitize.php
Last updated November 02, 2001

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