Glossary
This part lists important concepts and terms in CCD software.
Focal length
The focal length of an optical system is a measure of how strongly the system
converges or diverges light. A system with a shorter focal length has greater optical
power than one with a long focal length.
Gain
Adjusting the gain of the camera can adjust the contrast between black color and
white color of image. It is recommended not to set a high value.
Exposure
In photography, exposure is the amount of light per unit area (the image plane
luminance times the exposure time) reaching a photographic film or electronic
image sensor, as determined by shutter speed, lens aperture and scene luminance.
Spindle-CCD offset
It specifies the distance between the centerline of the spindle and CCD.
Aperture
Adjustment of the lens opening measured as f-number, which controls the amount
of light passing through the lens. Aperture also has an effect on depth of field and
diffraction. The higher the f-number, the smaller the opening, the less light, the
greater the depth of field, and the more the diffraction blur.
Working distance
It refers to the distance between workpiece and the front-end of the camera lens
when image is within the focal length.
A shorter working distance gets smaller camera angle and higher magnification
factor. On the contrary, a longer working distance gets bigger camera angle and
lower magnification factor.
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