| Oblique Illumination | The use of oblique (from the side) illumination gives the image a
3-dimensional appearance and can highlight otherwise invisible features.
A more recent technique based on this method is Hoffmann's modulation contrast,
a system found on inverted microscopes for use in cell culture. Oblique
illumination suffers from the same limitations as bright field
microscopy (low contrast of many biological samples; low apparent
resolution due to out of focus objects), but may highlight otherwise
invisible structures. |
| OCR | OCR = Optical Character Recognition |
| OEM
| Original
Equipment Manufacturer: a company that offers a product that uses
machine vision as a value additive feature rather than as an essential
component of the product. Vision is treated as a value adder and thus
does not represent the central functionality of the product. |
| Offset | Offset is just the same as the brightness control on your TV. It is a
positive DC offset of the image signal. It is used primarily to set the
level of black. Generally speaking, for the best signal, the black
level should be set so that it is near zero (but not below zero) on the
histogram. Increasing the brightness beyond this point just lightens the
image but without improving |
| OHCI | OHCI = Open Host Controller Interface |
| On Board Processing
| Refers to the presence of compute power for image processing on an image processing board |
One-push Auto Focus
| Focus hold mode that can be
automatically readjusted as required by the user (one-push auto focus
trigger) assuming that the required subject is within the focusing
limits of the camera lens. |
One-push White Balance
| AVT color cameras have not only manual but also one-push white balance.
For white balance, in total a number of frames are processed and a grid
of a number of samples is equally spread over the whole image area.
The R-G-B component values of the samples are added and are used as
actual values for both the one-push and the automatic white balance.
This feature uses the assumption that the R-G-B component sums of the
samples are equal; i.e., it assumes that the average of the sampled grid
pixels is to be monochrome. |
| Opaque mask | In CCD imaging technology, a light-impenetrable material that is used to
shield selected parts of a photosensitive surface. Opaque masks are used
in interline transfer CCDs and frame transfer CCDs. |
| Open | Erosion followed by a dilation. Opening removes bright spots isolated in dark regions and smoothes boundaries. |
Open Host Controller Interface
| Interface Open Host Controller
Interface (OHCI) describes the standards created by software and
hardware industry leaders (including Microsoft, Apple, Compaq, Intel,
Sun Microsystems, National Semiconductor, and Texas Instruments) to
assure that software (operating systems, drivers, applications) works
properly with any compliant hardware. |
Open Proper
| Proper Open Finite and dual combination of opening and closing
operations. Proper Opening removes bright pixels isolated in dark
regions and smoothes the boundaries of bright regions. |
Optical Character Recognition
| Optical Character Recognition (OCR) refers to the use of machine vision
cameras and computers to read and analyze human-readable alphanumeric
characters to recognize them. |
| Optics | Lenses and adjunct equipment such as irises, filters, mountings and mechanization |
Optocoupler
| An optocoupler is a device that uses a short optical transmission path
to transfer a signal between elements of a circuit, typically a
transmitter and a receiver, while keeping them electrically isolated.
Advantage: Since the signal goes from an electrical signal to an optical
signal back to an electrical signal, electrical contact along the path
is broken. |
