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 illuminance 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 : The distance between the centerline of the spindle and CCD.

Aperture : Ajustment 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.