Understanding Legacy Detection, Recognition, and Identification (DRI) measurements and new digital image processing capabilities.

If you have landed on this page you are probably working to understand the range performance of various infrared cameras.  The modeling for detection, recognition and identification you will find around the web will most likely be a version of Johnson Criteria that dates back  to 1958.   Since the early Johnson Criteria model was based on an image intensifier system, not infrared,  the model has been modified several times  to account for atmospherics, temperature delta T,  clutter, and various system design attributes.  You can learn more about the history of DRI modeling and Johnson Criteria in the “History and Evolution of the Johnson Criteria” authored by Tracy A. Sjaardema, Collin S. Smith, and Gabriel C. Birch document provided here.  This Sandia Labs research is available for public use.

Most demanding long-range, high-resolution applications with specific bandpass requirements will require some additional system engineering to extract the most performance from your design.  If you would like a copy of one of our DRI tools, just send us a note using the form below and one of our technical staff will assist.

The Johnson model was constructed for military target detection and based on analog systems with a low human detection probability.   Modern systems for thermal and visible detection perform significantly better than the legacy Johnson (or some later) models might lead you to believe.   High resolution digital systems coupled with moving target indicator (MTI) algorithms can detect very small changes in scene information that the human eye can’t detect.  MTI and color detection software running on very high-resolution digital systems have enormous promise for aerial surveillance and search and rescue missions.  For ITAR compliance reasons, we don’t publish any actual test data on our various camera systems.  If you have specific target detection range requirements, we encourage you to reach out to us.  We can provide additional technical detail to qualified US persons.

Designing a system that performs optimally for a specific altitude or range requirement can be a challenge depending on your size, weight and power budgets.  This is where we can help.   We can configure virtually any sensor with a custom dewar and cooler combination to meet your needs.   We can also integrate commercially available lenses or provide custom lens design.

We are happy to have one of our technical staff reach out to you.   Just fill out the form and let us know what time to call.   Our office hours are 8AM to 5PM EST, but we are happy to call when it’s convenient for you.

Imaging through fog in visible, mid-wave and long-wave

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We can send you a DRI utility in Excel.   We don’t engage in digital remarketing, so if you request information, we will have a technical person reach out.  

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