Allied Vision Technologies Pike Manual de Instruções descarregar pdf (Página 152)

Description of the data path

PIKE Technical Manual V4.0.0

152

Standard Parameter Update Timing

The Standard Parameter Update Timing keeps the frame rate constant and

does not create any gaps between two image transfers via bus (precondition:

exposure (shutter) time must be smaller than transfer time).

• Frame rate / transfer rate is always constant

(if shutter time < transfer time)

• Delay from shutter update until change takes place is always 2 frames

(delay from update command reception by FPGA and not by microcon-

troller)

• Parameters sent to the camera faster than max. frame rate are no longer

stored in a FIFO. The last sent parameter will be activated for the next

image. All others will be dropped. This ensures that the last image is

shot with the last shutter setting.

New: Quick Format Change Mode (QFCM)

The Quick Format Change Mode creates gaps between two images. Current

exposure is interrupted and the new exposure is started immediately with

new parameters if during exposure (integration/shutter) an new shutter com-

mand is received.

• Frame rate / transfer rate can be interrupted. This is shown in the dia-

gram below whenever FVal goes low after a reception of a new shutter

command while Sync was low.

• Shutter will be interrupted, if the update command is received while

camera integrates

• Delay from shutter update until change takes place is always 1 frame

(the delay is calculated from update command reception by FPGA and

not by microcontroller)

Figure 88: Quick Format Change Mode

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Allied Vision Technologies Pike Manual de Instruções Página 152