Allied Vision Technologies AVT Stingray Manual de Instruções descarregar pdf (Página 135)

Description of the data path

STINGRAY Technical Manual V2.2.0

134

To optimize the transfer of parameter changes there is a new timing mode

called Quick Format Change Mode, which effectively resets the current shut-

ter.

Therefore you can choose between the following update timing modes:

• Standard Parameter Update Timing

•New: Quick Format Change Mode

In the following you find a short description of both timing modes:

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)

1 2 ... 130 131 132 133 134 135 136 137 138 139 140 ... 308 309

Sem comentários

Allied Vision Technologies AVT Stingray Manual de Instruções Página 135