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Ohm

It is the unit of electrical resistance.  It measures the value of resistance through which a potential difference of one volt will maintain a current of one ampere.

On Screen Display, OSD
Is a menu appear on monitor display screen.  This function is to ease setting and selection function.

ONVIF, Open Network Video Interface Forum

ONVIF is an open industry forum for the development of a global standard for the interface of network video products.

Optical Low Pass Filter, OLPF

In high-quality digital imaging systems, optical low-pass filters are used to eliminate colour more fringes.  An OLPF cuts off the lens MTF above the sampling frequency of the imager resulting an overall MTF curve that approximates a step function in spatial domain.  IR cut-off function is often incorporated into OLPF as well.   OLPFs are made of several cemented layers of optical quartz material.  An IR cut-off coating and anti-reflection coating are applied to the external surfaces.  If the IR cut-off filter type is absorptive, the IR glass is inserted between the quartz layers.

Output Impedance

The impedance a device presents to its load.  The impedance measured at the output terminals of a transducer with the load disconnected and all impressed driving forces taken as zero.