Imatest Blemish Detection now available
Version 3.6 of Imatest's Master Edition delivers sophisticated blemish detection capabilities based on the human visual system's ability to detect blemishes.
Version 3.6 of Imatest's (Boulder, CO, USA) Master Edition delivers sophisticated blemish detection capabilities based on the human visual system's ability to detect blemishes. Soon this feature will also be added to the Industrial Testing Edition to enable blemish detection in high-volume camera-system production.
Blemish Detect detects visible sensor defects (typically blurred spots caused by dust in front of the image sensor). To ensure that visible blemishes are flagged— and blemishes below the threshold of visibility are not— the image is filtered by a response function derived from the Human Visual System (HVS). Filter settings are adjustable for a wide range of applications and viewing conditions. The IT version of Blemish Detect, which can be incorporated into automated testing systems, can significantly improve sensor yields.
For best results, Blemish parameters must be chosen with care.
Be sure to read the instructions!
The Blemish module was introduced in Imatest 3.6, January 2010 (Master-only)
Blemish Detect uses the same uniform featureless image as Light Falloff, but its emphasis is different— on defects or blemishes, i.e., localized density variations, rather than illumination falloff (vignetting).
-- Posted by Vision Systems Design