Functionality; Image Acquisition; Readout Modes - Photon Focus MV2-D1280-640 User Manual

Functionality

This chapter serves as an overview of the camera configuration modes and explains camera
features. The goal is to describe what can be done with the camera. The setup of the camera is
explained in later chapters.

4.1 Image Acquisition

4.1.1 Readout Modes

The MV2-D1280-640-CL-8 camera provides two different readout modes:
Sequential readout Frame time is the sum of exposure time and readout time. Exposure time
of the next image can only start if the readout time of the current image is finished.
Simultaneous readout (interleave) The frame time is determined by the maximum of the
exposure time or of the readout time, which ever of both is the longer one. Exposure
time of the next image can start during the readout time of the current image.
The following figure illustrates the effect on the frame rate when using either the sequential
readout mode or the simultaneous readout mode (interleave exposure).
F r a m e r a t e
( f p s )
Figure 4.1: Frame rate in sequential readout mode and simultaneous readout mode
Sequential readout mode For the calculation of the frame rate only a single formula applies:
frames per second equal to the inverse of the sum of exposure time and readout time.
Simultaneous readout mode (exposure time < readout time) The frame rate is given by the
readout time. Frames per second equal to the inverse of the readout time.
Simultaneous readout mode (exposure time > readout time) The frame rate is given by the
exposure time. Frames per second equal to the inverse of the exposure time.
The simultaneous readout mode allows higher frame rates. However, If the exposure time
significantly exceeds the readout time, then the effect on the frame rate is negligible.
f p s = 1 / r e a d o u t t i m e
S i m u l t a n e o u s
r e a d o u t m o d e
S e q u e n t i a l
r e a d o u t m o d e
e x p o s u r e t i m e < r e a d o u t t i m e
e x p o s u r e t i m e = r e a d o u t t i m e
f p s = 1 / e x p o s u r e t i m e
f p s = 1 / ( r e a d o u t t i m e + e x p o s u r e t i m e )
e x p o s u r e t i m e > r e a d o u t t i m e
E x p o s u r e t i m e
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