FastVision FASTCAMERA Series, Руководство пользователя, Страница: 15 / 32

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7 STANDARD CAMERA DATA FLOW
Sensor
128-1000MB
DDR
Memory
SRAM
LUT
By Pixel
Gain &
Offset
Data
Format
Funnel
Camera
Links
Mem LUT
Exposure
Control
CC1
CC2
CC3
Read
Memory
Serial
Settings
DDR
Tables
Clear
Memory
Or
Stop Filling
Trigger
Frame
Capture
ROI
Serial
Settings
Frame
Rate
And
Exposure
Serial
Settings
DDR Memory can be organized as a FIFO or as a circular buffer. CC3 is used to clear the
memory (FIFO) or stop filling the memory (circular buffer). CC2 is used to read the top most
image from memory (FIFO) or to read the oldest non-read image from memory (Circular buffer).
The LUT converts the input pixels (10 Bits) to the output pixel size (8 or 10 Bits). These tables
can also be used to improve the linearity of the sensor, or to set the gamma of the camera.
DDR Memory can be used for image averaging. In this mode Images are summed into a 32 bit
per pixel buffer, which can be read out at any time (CC2) and/or cleared (CC3).CC1,CC2, and
CC3 can be replaced by Serial Commands, or can be always enabled or disabled, for free
running operation.
8 THE STANDARD CAMERA FUNCTIONALITY
The ‘Standard’ Camera is a set of FPGAs designed to support most of the typical uses of the
camera. There is functionality than you will find is a good starting point for modifications. This
design is copyrighted IP from FastVision and forms the reference design, which is available from
FastVision for use only with the FastCamera40
The frame rate and exposure can be controlled in several ways.
Free Running Mode
CC1 positive(or negative) edge triggered
CC1 exposure control (positive or negative level triggered)
In Free running mode, the frame rate and exposure time is set via the serial port and the
camera acquires images without further outside control.
8.1 Exposure Control