Photon Focus MV1-D1280-L01-1280-G2-12, User Manual, Page: 79 / 139

5.11 Image Burst
5.11 Image Burst
The camera contains an image memory (RAM) of 256 MByte. A number of images can be
stored in this memory at high speed and the data can later be read out at normal GigE speed.
This feature is called Image Burst. The number of images, which can be stored to the burst
memory can be calculated according to the following of formula:
integer(256MB / ( WidhtInterface x HeightInterface ))
Table 5.8 shows the number of images, which can be stored to the memory depending on the
resolution.
ROI Dimension Number of Frames
1280 x 1024 204
1280 x 768 (WXGA) 273
800 x 600 (SVGA) 559
640 x 480 (VGA) 873
512 x 512 1024
Table 5.8: Number of frames at different ROI settings.
Image Burst can be used if you want to acquire a number of images at high speed and there is
a large time between successive burst acquisitions. In this case there is enough time to read out
the memory at the slower GigE speed between the bursts.
At full camera speed, a sequence of about 215ms can be stored to the memory. This time can
be increased by decreaing of the acquisition frame rate and/or decreasing of the image height
and width. For instances a sequence of 1s can be stored, when the image resolution is 512x512
and the frame rate 1000fps.
ImageBurst_Enable
must be enabled to be able to store images to the memory. Images are
stored when acquisition is started. When the memory is full, the writing is stopped. The flags
ImageBurst_MemoryFull and ImageBurst_MemoryOverflow indicate the status of writing.
The write pointer can be set to the start of the memory by sending a
ImageBurst_PortReset
command. Images can then be written again to the memory.
To read out the memory first start image acquisition and then send a
ImageBurst_StartReadMemory
command (or click on the button in PF_GEVPlayer). The images that
are read out are specified by the properties
ImageBurst_FirstImageNr
and
ImageBurst_NrOfImages
.
The memory can be read and written simultaneously. The user must synchronize reading and
writing, so that no memory location is written and read at the same time or that no image is
overwritten before it is read out. This is shown in the diagram in Fig. 5.40. Reading of the
memory can start after the writing of the first image has started. The time from the active
trigger edge to the start of writing is approx. the sum of the trigger delay, the exposure time
and the readout delay (see also timing diagrams in Section 5.1.6).
The images must be read with the same settings as they were written.
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