SVS-Vistek HR Series, Manual

Page: 36 / 102

SVS-VISTEK
Feature description 36
Dual-Tap
Figure 6: Figure of 2 taps
In a dual-tap CCDs, (CCD with two outputs) the readout of pixel charge
takes place in a serial/parallel sequence. Each line is divided in half and
the pixels of both halves are read out simultaneously, line by line. For a
given pixel clock frequency, only half the time is required to read out the
entire array, resulting in twice the framerate.
Figure 7: Illustration of 2 taps
Quad-Tap
Figure 8: Figure of 4 taps
Quad-tap CCDs (CCD with four outputs) the read out of pixels is four
times faster than in a “regular” sensor.
Figure 9: Illustration of 4 tap
6.2.7 Tap Reconstruction
The data coming from the camera have to be reconstructed to the
original image data structure. This task is done either by the frame
grabber hardware (Camera Link, CXP) or the driver software (GigE, USB).
The process is transparent, so it doesn’t matter whether the physical
interface is serial or parallel.