4-channel frame grabber | Model 2255/2257

Model 2255 4-channel frame grabberView CE compliance report
  • Simultaneous capture from 4 NTSC/PAL video sources
  • High aggregate capture rate: up to 120/100 fps (NTSC/PAL)
  • Output formats: RGB/YCrCb, packed/planar
  • Output resolutions: full/half/quarter frame
  • Advanced deinterlacing eliminates motion artifacts
  • Field capture mode allows lower latency display for CIF resolution
  • Hardware JPEG compression
  • Hardware timestamps (1ms resolution)
  • USB powered


Model 2255 simultaneously captures uncompressed frames from four NTSC or PAL video sources and sends them over USB 2.0 to a host computer. Model 2257 is functionally identical to the 2255 except for input types: Model 2255 has four composite video inputs, whereas Model 2257 has two S-Video and two composite inputs.

Models 2255/2257 block diagram


The maximum aggregate capture rate in full resolution color mode is 60/50 fps (NTSC/PAL), yielding a per-channel NTSC capture rate of 30 fps for two channels, or 15 fps for four channels. In monochrome and scaled-down modes all four channels can capture at full frame rates.

A variety of output resolutions and formats are supported, eliminating the need for the application program to perform format and resolution conversions. The units are capable of capturing frames in any of these formats:

  • RGB packed (24 bits/pixel, bitmap compatible)
  • YCrCb packed (16 bits/pixel, YUY2 compatible)
  • YCrCb planar (16 bits/pixel, optimal for image processing)
  • Y8 (8 bits/pixel, monochrome)

The units support Y8 and YCrCb planar natively, while conversions to RGB and YCrCb packed formats are optionally performed by Sensoray drivers. Please refer to the 2255 software documentation for details.

Each unit has a serial number that can be read through the API, thus enabling the application software to easily identify specific units in multi-unit systems.

Low latency

Models 2255/2257 have exceptionally low latency, making them especially useful in applications that require fast visual feedback.


Models 2255/2257 are capable of performing advanced video deinterlacing to reduce motion artifacts in captured images. Deinterlacing is performed by hardware so that the host computer is not burdened with this task.

No deinterlacing

Motion artifacts due to interlacing

With deinterlacing

Motion artifacts eliminated by deinterlacing


Sensoray offers several free, downloadable Software Development Kits (SDKs) to enable OEMs to quickly integrate Model 2255/2257 units into application systems:

  • Windows API. This is recommended for most Windows applications. Image buffers are allocated by the application and then registered with the driver, thereby greatly simplifying both custom application development and integration with third-party image processing software.
  • Direct Show API for Windows. This is recommended only for Direct Show application development.
  • Linux API, which includes Video4Linux2 (V4L2) support.

Hardware compression facilitates simultaneous JPEG capture at 30 fps on two channels, or on four channels at 15 fps.


A USB cable is supplied with models 2255 and 2257. Video cables must be purchased separately.

Packaging Options

Model 2255 is available as an OEM bare board (Model 2255), in a metal enclosure (Model 2255S), or mounted on a PC expansion bracket (Model 2255S-PC). For OEM applications, the unit can be custom-ordered to include high density headers in place of the standard connectors (Model 2255-NC).

Model 2255S-PC


Model 2257 is available as an OEM bare board (Model 2257) or in a metal enclosure (Model 2257S).

Model 2257



System requirements: USB 2.0 high-speed port, PIII 700 MHz CPU or equivalent. A high performance CPU is recommended for applications in which heavy image processing is performed.

Activation of deinterlacing is optional; when active, it reduces the maximum capture rate by a few percent.

Inputs Type 2255: 4 composite (BNC)
2257: 2 composite, 2 S-Video
Video format NTSC (M), PAL (BDGHIMN)
Output Resolution NTSC: 640 x 480, 320 x 240, 640 x 240
PAL: 704 x 576, 352 x 288, 704 x 288
Maximum capture rate (from all channels) Color, full size 60 (50) fps (NTSC/PAL)
Monochrome and/or scaled down 120 (100) fps (NTSC/PAL)
USB Current (max.) 470 mA
Operating temperature Certified range 0-70°C
Mechanical Weight 2255S (with enclosure): 0.58 lbs
2255 (without enclosure): 0.25 lbs


File Version Type Size
Model 2255/2257 Hardware and Software Manual1.0.8PDF405 KB
Model 2255 dimensions1.0.0PDF129 KB
Model 2257 dimensions1.0.0PDF113 KB
CE Compliance Report, model 2255PDF1.99 MB


File Version Type Size
Windows Drivers and SDK1.1.9ZIP27.08 MB
Windows Direct Show SDK1.1.10ZIP4.07 MB
Linux Drivers and SDK1.1.37BZ2239 KB
USB firmware update0.3.12ZIP105 KB
Other Operating Systems
Need a software development kit for another operating system? We can port our SDK to
your OS or provide the information you need to do it yourself. Contact Sales for details.

Pricing & Ordering

Model Description Qty 1 Qty 2-9 Order Qty.
Frame Grabbers with 4 Composite Inputs
22554-channel frame grabber board$512$464
2255S4-channel frame grabber in metal enclosure$565$514
2255S-PC4-channel frame grabber board w/ PC mounting bracket$534$487
2255-NC4-channel frame grabber board w/ high density headersCallCall 
Frame Grabbers with 2 S-Video + 2 Composite Inputs
22574-channel frame grabber boardCallCall 
2257S4-channel frame grabber in metal enclosureCallCall 

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