Comparing Camera Performance, Part 1 Sensitivity

With this blog, we will continue a short series on comparing camera performance.  Some of this can be done by comparing manufacturer provided specification sheets.  Usually after you have narrowed down your selection, you want to evaluate the cameras for yourself and perform some measurements to allow for a quantified comparison.  This can be a…

How to Measure the Fixed-Pattern Noise in Dark or DSNU: Repost from Harvest Imaging

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…

How many cameras does a system need?

The number of cameras and the necessary mix of low- and high-end models you need depends on how you will use a machine-vision system. Ann R. Thryft, Contributing Technical Editor – Test & Measurement World, 10/1/2011 12:00:00 AM Joost van Kuijk CEO/CMO Multiple-camera vision systems can contain anywhere from three cameras for simple applications, such…

Why the Modulation Transfer Function – MTF – also matters with camera selection, especially in NIR

The Optical Transfer Function (OTF) is an important specification of lens performance. The OTF describes both the amplitude and the phase of a signal. In most cases the former, most times indicated as is Modulation Transfer Function (MTF), suffices. Modulation, as it is a measure of the modulation depth (contrast) of an optical signal. The MTF is for that…

CCD vs. CMOS Image Sensors in Defense Cameras

CMOS sensor based defense cameras are gaining ground, but for long-term, reliable, high image quality applications, CCDs will continue to be the preferred option for a while. On February 8th, we discussed the CCD vs. CMOS sensors in machine vision cameras.  We discussed that CMOS image sensors have shown significant improvements in quality and are quickly approaching that…