Frame Grabber

Model 311


High frame rate using the PC/104+ bus

Color or monochrome: PAL, SECAM, NTSC, RS-170 CCIR compatible

Four composite video inputs or three composite and one S-video

Eight TTL I/O lines for camera control

Programmable AGC, hue, contrast, saturation

Optional enhanced SDK for Windows 98/2000/NT

Optional DOS and Linux drivers


Sensoray Model 311 frame grabber converts video camera signals into digital data required for computer image processing and display. Up to four cameras may be connected to the board: four with composite video or three with composite and one with an S-video output. The 311 provides four digital input lines and four output lines to control camera focus, pan, tilt and triggering.

Frame Rate
Model 311 can transfer 30 frames per second with the supplied software. It supports a variety of digital formats including RGB24 and Y8 that are directly compatible with Windows bitmaps.

PC/104+ bus
Model 311 requires the PC/104+ bus.

The Model 311 uses special circuitry to achieve horizontal and subcarrier synchronization to incoming video.

It guarantees generation of the required pixel/line from a video source in which line length can vary by several microseconds. This circuitry allows the 311 adapter to quickly and accurately lock on to video signals, regardless of source. Since the technique is completely digital, the 311 can recognize unstable signals caused by VCR head switching and adapt the locking mechanism to accommodate the source.


Image scaling
Under software control the 311 adapter can independently scale the X and Y dimensions of the captured frame. Full-resolution video may be reduced to any size down to the size of an icon. A software selectable digital filter is available to minimize aliasing artifacts induced by scaling.

A/D Conversion
The 311's signal processor uses two flash analog-to-digital converters; one for chrominance and one for luminance. Each A/D provides 2x over sampling of the camera signal. Over sampling, combined with analog anti-aliasing filters, significantly reduces the overall sensitivity to unwanted aliasing signals and enhances the 311's digital filtering.

The 311 is capable of sending just the luminance data to the host's image buffer. This feature speeds capturing monochrome images.

Included Software (SDK )
The software development kit, SDK, includes a C-language sample program that allows capturing and saving color and monochrome images. It illustrates the 311's scaling feature and shows how to call the included DLL from a C program. The supplied 32-bit DLL supports interrupts and multiple DMA buffers that may be scattered within the host's memory. The DLL supports capture directly into video memory and graphic overlays when using Direct Draw (only supported with enhanced SDK).

An optional DOS driver, x11DOS,  includes a C++ application program.

A Linux driver is available.

An enhanced development kit, SDK11E, includes more sample applications. It supports Direct Draw and the ability to store a color and monochrome image. SDK11E is sold separately for $ 95.

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General specifications


Capture rate

30 frames/sec (NTSC, RS-170, CCIR)
25 frames/sec (PAL, SECAM)

A/D resolution

8-bits for luminance
8-bits for chrominance

FIFO size

560 bytes (280 pixels)

Output resolution

768 x 576 (PAL, SECAM)
640 x 480 (NTSC, RS-170)

Y bandwidth error

0.6 dB

Board size

3.80" x 3.55"

Output format


Input power

5 volts at 280 mA

Bus structure



Ordering Information


PC/104+  frame grabber


1meter coax video cable


Y/C (S-video) 1 meter cable


Enhanced software kit