Sensors of different shapes and sizes are used in image processing and surveillance technology.
On one hand the sensors have a different ratio of width to height,
for example z.B. 1:1, 4:3, 16:9, 16:10
On the other hand, the sensor size differs, which is described by the sensor diagonal:
For sensors >= 1/2″ , the diagonal is 16mm * inch
for example 16mm * 1/2 = 8mm
For sensors < 1/2" , the diagonal is 18mm * inch
for example 18mm * 1/3 = 6mm
See: vidicon tube