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Digital Imaging

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Video printer

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During the 1980s, imaging evolved with the use of closed circuit video cameras and monitors used in conjunction with comparison microscopes. By the late 1980s, it was possible to capture and print a screen shot of the image for case documentation. The image could also be exported to a computer for insertion in a document. These techniques continue to be useful and efficient.  Bracketing was not necessary; one capture was sufficient to achieve a quality image.

Digital imaging camera,
mounted on top of microscope

Image courtesy of
Motic Instruments Inc.A

As digital cameras became more affordable and versatile (1990s), their adaptation to comparison microscopy was feasible. Digital cameras can be converted to microscope cameras if the lens barrel is threaded to accept filters and measuring reticules. This adaptation is universal for comparison microscopes, but specific to the model of camera. High-quality pictures are obtained using this method. Alternatively, an examiner may obtain quality images using a handheld digital camera held up to either eyepiece of a comparison microscope.

Current comparison microscopes typically have integrated systems for digital image capture, such as:

  • Image storage
  • Image enhancement
  • Image overlay
  • Side-by-side comparisons
  • Image file export
Note:

The equipment and instrumentation as well as the facilities and supplies required for gunshot residues analyses are covered in Module 12, Gunshot Residue and Distance Determination.

AImages and trademarks are being used by permission of Motic Instruments Inc.,180-420 Viking Way, Richmond BC, V6V 4L8, Canada www.motic.com, 877-977-4717

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