Last week, we wrote about the differences between the camera and the image sensor and what camera manufacturers can do to improve image quality. We have also talked about compensating for artifacts in the sensor. Fixed-pattern noise is one such sensor imperfection which refers to the non-uniformity between pixels. It can be described by two parameters DSNU (dark signal non-uniformity) and PRNU (photo response non-uniformity).
Albert Theuwissen of Harvest Imaging has prepared some excellent blogs on how to measure Fixed Pattern Noise in Dark or DSNU in order to properly do the analysis yourself if you choose. It may also give you an appreciation for what is understood and corrected with in-camera flat field correction.
How to Measure the Fixed-Pattern Noise in Dark or DSNU (1): http://harvestimaging.com/blog/?p=814
How to Measure the Fixed-Pattern Noise in Dark or DSNU (2): http://harvestimaging.com/blog/?p=838
And another good reference:
How to Measure the Average Dark Signal: http://harvestimaging.com/blog/?p=795
We look forward to more great blogs like this in Albert’s How to Measure series.