Instruction manual
Guppy Technical ManualV7.4.0
129
Description of the data path
HDR (high dynamic range) (Guppy F-036 only)
The HDR mode is available for the Guppy F-036 cameras with the Micron/Aptina
MT9V022 sensor. (HDR = high dynamic range)
HDR enhances the range of illumination levels that can be distinguished. The
MT9V022 sensor gives you an intrascene optical dynamic range exceeding 110
dB.
Thus the Guppy F-036 cameras are ideal for interior and exterior automotive,
security and machine-vision imaging.
HDR overview (HiDy sensor)
With the MT9V022 sensor you achieve a high, intrascene-dynamic range the so-
called HiDy. This is Micron/Aptina’s name for the HDR mode.
Analog signal chain and ADC are designed in a manner that saturation occurs
only at extremely high levels of illumination. The pixel operation allows auto-
matic exposure control of the pixel saturation level and manual adjustment of
the knee points (one or two) during the exposure period. The automatic control
creates a piece-wise linear response to the illumination. Exposure time is con-
trolled automatically, whereas you adjust manually the maximum storage
charge of the pixel knee points to get a response curve that is a combination of
piece-wise linear segments of decreasing gradients.
Figure 83: HDR response curves
Knee points
Piece-wise linear response
Linear response
Saturation
Input illumination
ADC output