Dark Current
| Dark current is the accumulation of electrons within a CCD or CMOS image |
Dark Field Illumination
| An
illumination technique where the angle of incidence of the light
relative to the surface of the object is less than 90 degrees (directly
on top). As the degree of the angle decreases, less light reflects off
the object's surface, thus darkening the field. |
Dark Noise
| Dark noise is the statistical variation of the dark current, equal to the |
| dB | abbr. of decibel |
| DCAM | DCAM = digital camera specification |
| Decibel | Decibel (abbr. dB) is a measurement unit of dynamic range. |
Depth of field
| Depth of field refers to the in-focus region of an imaging system. |
Deviation Factor
| Determines the sensitivity of the algorithm. Values range from 0 to 1,
with 0 being the most sensitive to noise. The lower the Deviation
Factor, the closer the pixel value must be to the mean value to be
selected as part of a particle. |
| Diffused Back Light Illumination | A combination of back lighting and diffuse illumination, typically used in measurement applications.
|
| Diffuse Illumination
| Lighting that is uniform, soft, relatively non-directional and lacking in concentration. The opposite of point illumination. |
| Digital
| A method of
storing, processing and transmitting information through the use of
distinct electronic or optical pulses that represent the binary digits 0
and 1. The opposite of analog. |
Digital Camera
| A digital camera is an electronic device to transform images into electronic |
Digital Photography
| Digital photography uses an electronic sensor to record the image |
| Dilate | Dilation increases the brightness of each pixel surrounded by neighbors with a higher intensity. |
| Directional Back Light Illumination | |
| Distributor
| A supplier of machine vision products manufactured by others |
| Dome Lighting
| A spherical light source that provides even diffuse illumination |
| DSP
| Digital
Signal Processor: a specialized digital microprocessor used to
efficiently and rapidly perform calculations on digitized signals that
were originally analog in form |
| Dynamic Range | The ratio of the maximum signal relative to the minimum measurable
signal sensor that are generated thermally rather than by light. This is
a form of noise that is most problematic in low light applications
requiring long exposure times. |
