Camera technology basics
This chapter is supposed to impart several basics in the field of camera technology which tend to figure on data sheets.
- Resolution and sensor size: which finest features and object structures on the component must be detected with which attention to detail? Particularly in case of large components, high camera resolution is required. How large must the sensor be and which optics is to be used?
- Sensor Type: CCD or CMOS? ? CCD cameras tend to produce a more homogenous image, they are more light-sensitive but tend to smearing and blooming in case of overexposure. CMOS cameras usually require more light and must be well calibrated (dark image, bright image), as they produce a more inhomogeneous image by nature. However, they are more tolerant towards extreme lighting conditions and do not display any smearing and blooming.
- Trigger functions , camera electronics and processing: how should the image be captured, with how many bits of signal depth (e.g. 8, 10, or 12 bits monochrome, etc.), should the image be calibrated already in the camera, etc.?
- Which features and tricks do cameras provide in order to read out the image electronically? Partial scan, progressive scan, global or rolling shutter, binning, multi-tap readout provide possibilities to read out the image in a very special way.
- Which pre-processing and processing functions are implemented in industrial state-of-the-art cameras and what can they be used for? Here, look-up tables, shading and defective pixel corrections and Bayer conversion are mentioned and explained.
Further camera technology basics
Please also note the further camera basics in the chapters