I must calibrate unirradiated fuel plates digital radiographies for uranium density. They are surrounded by an aluminum frame which should obviously show up as zero uranium density; however, the only function that seems to coerce undesireable negative values to zero is “Rodbard (NIH)”, while I would like to use something like “y=a+b*ln(x-c)” instead and still get zero results for the two brighter areas of the image. How can I coerce negative density values to zero?
I’m attaching a downsized, downscaled (8-bit) version of the original file showing the aluminum frame around the fuel core, lying on the empty glass bed of the scanner around it. There are grossly three levels of grays, but all the information needed must be extracted from the large central dark area. Original file is in 16-bit format, though scanner resolution is only 12-bit. Calibrated densities must show zero for both of the two brighter
I know ImageJ is aimed to medical and biological image analysis, but I’m getting surprisingly good results for this kind of quality control on fuel plate production at our institute by combining built-in tools with macro programming; some of our coleagues are overwhelmed.
Thank you for any help, and wish you a Happy New Year!
Flavio, from IPEN (Sao Paulo, Brazil).