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Chap.2 Lens and Image Sensor Technology

Lens and Image Sensor Technology

2.1 Lens

The generation of a high quality image is decided by many factors including light source of the environment, lens,

sensor, compression engine, etc. However, for camera itself, a lens is the most fundamental component that

rstlydecidesiftheoutputofthequalityisgoodornot.Inthesecurityindustry,becausetheuseofcameradiffers,

especiallyxedtypewithC/CSmount,systeminstallersthemselveshavetoselectandpurchasealensttingtheir

specicneeds.

2.1.1 Focal Length

Focal length is the distance between the sensor and secondary principal point of the lens.

Chap.2

Theshorterthefocallength,thewidereldofviewitoffersandhigherlevelofdistortionitmaycause.Incontrast,

thelongerthefocallength,thesmallerviewingangleandeldofobjectithas.

Focal Length

Focal Point/

Image Sensor

Forward Principal Point

Backward Principal Point

Figure 2.1 Focal length

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