Point Grey Research Grasshopper Technical Reference
Camera Operations and Features
Revised 26-Nov-10
Copyright (c) 2010 Point Grey Research Inc.
34
7 Mono16 2,2 16 1844
45
612X512
- - - 61 71
Table 10: Supported partial image (Format 7) video formats and modes for GRAS-50S5C
L
The maximum resolution currently supported by the GRAS-50S5C
when using a mode that performs color processing on board (e.g.
Mono8, YUV422, RGB) is 2040x2040. In order to access the full
2048x2048 array, Raw8 or Raw16 modes must be used. See
Knowledge Base Article 276 for instructions on how to access the full
sensor array.
4.4.1. Calculating Format_7 Frame Rates
The theoretical frame rate (FPS) that can be achieved given the number of packets per frame
(PPF) can be calculated as follows:
FPS = 1
Packets per Frame * 125us
An estimate for the number of packets per frame can be determined according to the following:
PPF = Image_Size * Bytes_Per_Pixel
Bytes_Per_Packet
For the exact number of packets per frame, query the PACKET_PER_FRAME_INQ register; for
the number of bytes per packet, query the BYTE_PER_PACKET register.
For example, assuming an image size of 1032x776, pixel format of Mono16 (2 bytes per pixel),
and 3072 bytes per packet, the calculation would be as follows:
FPS = 1 / ( ( 1032*776*2 / 3072 ) * 0.000125 )
FPS = 1 / ( 521 / 8000 )
FPS = 15.34
An interactive bandwidth calculator is available in
Knowledge Base Article 22. It can be used to
calculate approximate bandwidth requirements for various DCAM modes.
4.4.2. Subsampling and Binning in Format_7
Depending on the Format_7 imaging parameters, the camera may be performing image
manipulation operations such as subsampling or binning.
The read-only FORMAT_7_RESIZE_INQ register at 0x1AC8 contains information pertinent to the
current Format_7 mode such as whether standard or bayer binning is being performed on the
image.
For more detailed information on the FORMAT_7_RESIZE_INQ register, please see the PGR
IEEE-1394 Digital Camera Register Reference.
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