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NI PCI Vision Acquisition
NI PCI Vision Acquisition devices connect industrial and scientific cameras to a host computer for machine vision, automated inspection and high-speed image recording. These PCI and PCI Express frame grabbers acquire image data, manage camera timing and triggers, and transfer frames to computer memory for display, analysis or storage.
NI vision acquisition hardware includes legacy analog video digitizers and digital Camera Link frame grabbers. Correct selection depends on the camera interface, area-scan or line-scan architecture, pixel format, tap configuration, pixel clock, frame rate, trigger requirements, host-bus bandwidth, cable type and NI Vision Acquisition Software compatibility.
What Is a PCI Vision Acquisition Device?
A PCI vision acquisition device, also called a frame grabber, receives image data from an industrial camera and transfers it into computer memory. Unlike a standard display or consumer video-capture card, an industrial frame grabber can support precise triggering, camera control, continuous acquisition and synchronization with inspection equipment.
A typical system includes:
An area-scan or line-scan industrial camera
A compatible camera interface and frame grabber
Camera and trigger cables
Lens, lighting and optical accessories
Encoder, sensor or external trigger signals
A compatible host computer and PCI or PCIe slot
NI Vision Acquisition Software
Image-processing or inspection software
The frame grabber handles image transfer and camera-related timing. Image processing, feature measurement, defect classification and inspection decisions are normally performed by host software after acquisition.
PCI Vision Acquisition Interface Types
Interface Type
Connection Architecture
Primary Advantage
Best Fit
Analog Video
Coaxial or multipin analog camera connection
Supports legacy monochrome, composite and nonstandard analog cameras
Maintaining established inspection and scientific imaging systems
Base Camera Link
One Camera Link data cable
Deterministic digital image transfer with camera control and triggering
Standard industrial area-scan and line-scan cameras
Medium or Full Camera Link
Normally two Camera Link data cables
Greater data width and higher image throughput
High-resolution, high-frame-rate and multi-tap cameras
Power over Camera Link
Camera Link data cable with supported camera power
Can reduce separate camera power wiring
Compatible PoCL cameras and compact installations
GigE Vision
Ethernet interface rather than a dedicated frame grabber
Longer cable distance and network-based camera connectivity
Distributed machine vision with moderate bandwidth requirements
USB3 Vision
USB 3.x host-controller connection
Simple connection and high data throughput over shorter distances
Laboratory, desktop and compact vision systems
The camera connector alone does not confirm compatibility. Camera Link systems must also match the Base, Medium, Full or extended configuration, connector style, number of cables, pixel clock, tap geometry, bit depth and camera configuration file.
Representative NI PCI Vision Acquisition Devices
Model
Unique Category
Core Architecture
Best Fit
PCI-1410
Analog Monochrome Acquisition
Four analog video inputs with 8- or 10-bit digitization and support for standard and nonstandard monochrome cameras
Legacy RS-170, CCIR, NTSC, PAL, progressive-scan and line-scan systems
PCI-1426
Base Camera Link Acquisition
Conventional PCI frame grabber for Base-configuration Camera Link cameras with external trigger and control I/O
Industrial digital cameras that do not require Medium or Full Camera Link bandwidth
PCIe-1429
Full Camera Link Acquisition
PCI Express frame grabber supporting higher-bandwidth Camera Link camera configurations
High-resolution area-scan and line-scan acquisition
PCIe-1433
Extended Camera Link Acquisition
PCI Express Camera Link frame grabber supporting Base, Medium, Full and extended camera configurations with onboard buffering
High-data-rate machine vision and scientific imaging
These models represent different camera-interface generations. They should not be selected only by host-bus type or acquisition speed. The exact camera output format and timing must be matched to the frame grabber.
How to Select a PCI Vision Acquisition Device
1. Identify the Camera Interface
Begin with the complete camera manufacturer and model number. Obtain the camera manual and confirm whether its output is analog video, Camera Link, GigE Vision, USB3 Vision, IEEE 1394 or another interface.
An analog frame grabber cannot acquire a Camera Link signal, and a Camera Link board cannot directly acquire GigE Vision or USB3 Vision data. Electrical adapters do not convert between these image-transfer protocols.
2. Determine Area-Scan or Line-Scan Architecture
Area-scan cameras capture a two-dimensional frame during each exposure. They are used for discrete parts, presence inspection, alignment and general imaging.
Line-scan cameras acquire one or more rows of pixels at a time while the object or camera moves. The application reconstructs the lines into a complete image. Line-scan systems require careful synchronization between line acquisition, conveyor motion and encoder signals.
For line-scan selection, record:
Pixels per line
Required line rate
Pixel bit depth
Number of camera taps
Encoder resolution
Expected object speed
Required trigger and exposure timing
3. Match the Camera Link Configuration
Camera Link cameras may use Base, Medium, Full or extended configurations. The configuration determines the number of data paths, cables and supported throughput.
Base Camera Link normally uses one cable. Medium and Full configurations normally use two. Higher-tap and extended camera modes require a frame grabber explicitly supporting the camera’s data mapping.
Also verify:
MDR or SDR connector style
Number of Camera Link connectors
Pixel clock range
Number and arrangement of data taps
Pixel bit depth
Monochrome or color format
PoCL support
Camera serial-control requirements
4. Calculate the Image Data Rate
For an area-scan camera, the approximate uncompressed payload rate is:
Data rate = image width × image height × bytes per pixel × frames per second.
For a line-scan camera:
Data rate = pixels per line × bytes per pixel × lines per second.
Use the transferred or stored pixel width rather than only the sensor bit depth. A 10-bit or 12-bit camera may transfer each pixel in a 16-bit container. Color images, metadata, padding and alignment can further increase the data volume.
The camera interface, frame grabber, PCIe slot, computer memory, processing software and storage system must all sustain the resulting rate.
5. Verify Pixel Clock and Tap Configuration
The pixel clock determines when image data is transferred from the camera. Multi-tap cameras divide pixels among several parallel data paths to increase throughput.
The frame grabber must interpret the tap geometry correctly. An incorrect tap configuration can produce images with interleaved, reversed, shifted or missing pixels even when acquisition starts successfully.
Check the camera documentation for tap order, data-valid signals, line-valid signals, frame-valid signals and any manufacturer-specific timing requirements.
6. Define Triggering Requirements
Industrial vision systems often acquire images in response to a photoelectric sensor, encoder, programmable controller or other test instrument. Hardware triggering provides more repeatable timing than starting each acquisition through host software.
Determine:
Trigger source and voltage level
Rising- or falling-edge operation
Trigger delay
Required exposure timing
Debounce or filtering requirements
Camera-ready and exposure-active signals
Missed-trigger behavior
Need for isolated trigger inputs
The frame grabber’s camera-control outputs may be used for exposure, integration or shutter timing when supported by the camera and acquisition configuration.
7. Select Onboard Buffer Capacity
Onboard frame memory or FIFO buffering helps absorb temporary differences between the camera data rate and host-computer transfer rate. It is particularly important for high-speed cameras, burst acquisition and systems with temporary PCIe or processor contention.
Onboard buffering does not replace adequate sustained system throughput. If the host cannot remove or process images quickly enough, buffers will eventually fill and acquisition may stop or frames may be lost.
8. Review PCI or PCI Express Compatibility
Conventional PCI and PCI Express are different interfaces and cannot be installed in the same slot type. Confirm the available connector, lane width, slot power and physical clearance in the host computer.
For PCIe frame grabbers, verify that the selected slot provides at least the electrical lane width required by the board. A physically long connector does not always guarantee that every lane is electrically connected.
Also review:
Motherboard slot allocation
PCIe bandwidth shared with other devices
Graphics-card and storage traffic
Computer cooling and airflow
64-bit memory addressing support
BIOS configuration
Operating-system compatibility
Camera Files and Device Configuration
Many Camera Link and nonstandard analog cameras require a camera configuration file. The file describes the image dimensions, timing, tap mapping, pixel format and acquisition behavior expected by the frame grabber.
A camera file should match the exact camera model and operating mode. Changing the camera resolution, tap configuration, pixel clock or bit depth may require a different file or modified settings.
Common signs of an incorrect camera configuration include:
No image despite an active camera connection
Timeout during acquisition
Incorrect image width or height
Repeated or missing image sections
Alternating bright and dark pixels
Reversed tap order
Incorrect pixel intensity
Acquisition stopping at higher frame rates
Confirm camera operation with the supported configuration utility before developing the complete inspection application.
Acquisition Modes
Acquisition Mode
Operation
Best Fit
Snap
Acquires one image after the operation is initiated
Setup, alignment and occasional inspection
Grab
Continuously acquires images into reusable buffers
Live display and continuous processing
Sequence
Acquires a defined series of images into multiple buffers
Burst analysis and finite high-speed recording
Triggered Acquisition
Captures images in response to hardware events
Production inspection and synchronized experiments
Ring Buffer
Continuously cycles through a group of image buffers
Continuous inspection and event capture
The required buffer count depends on the frame rate, processing time, display load and temporary operating-system delays. High-rate applications should separate acquisition, processing, display and storage into coordinated software tasks.
Triggering, Encoders and System Synchronization
A complete machine vision system may coordinate cameras, lighting controllers, motion axes, encoders, sensors and reject mechanisms. Timing should be designed for the complete inspection sequence rather than only the camera exposure.
Typical signal flow includes:
A sensor detects the approaching product.
The frame grabber or controller delays the trigger to the inspection position.
The camera exposure and strobe lighting are activated.
The frame grabber transfers the image into memory.
Vision software processes the image and makes an inspection decision.
A controller activates the sorting or reject mechanism at the correct position.
Encoder-based line-scan acquisition should use hardware timing so image scale remains consistent as conveyor speed changes. Software-timed line triggering can cause geometric distortion and inconsistent inspection results.
Cameras, Cables and Accessories
The frame grabber is one part of the image-acquisition system. Confirm all required components before ordering:
Camera manufacturer and exact model
Camera Link or analog interface cable
MDR or SDR connector type
One- or two-cable Camera Link configuration
PoCL compatibility or external camera power supply
Trigger and digital I/O breakout cable
RTSI or other synchronization cable where applicable
Lens mount and compatible lens
Lighting and lighting controller
Encoder, photoelectric sensor or external trigger source
Camera Link cables are not generic network cables. Use cables designed for the required Camera Link configuration, connector style, clock rate and installation environment.
Long cables, cable flexing, poor shielding and incorrect routing can reduce signal integrity. Robotic and moving applications may require high-flex vision cables rated for repeated motion.
Lighting and Optical Considerations
Image quality depends heavily on the lens and lighting. A higher-resolution camera or faster frame grabber cannot correct inadequate contrast, optical blur, motion blur or inconsistent illumination.
Review:
Field of view
Required spatial resolution
Working distance
Depth of field
Lens focal length
Sensor size and lens coverage
Exposure time
Object speed and motion blur
Lighting geometry, color and intensity
Need for strobed illumination
The required object resolution can be estimated by dividing the field of view by the number of usable sensor pixels. Allow additional pixel coverage for reliable edge detection, measurement or defect classification.
NI Vision Software Compatibility
NI Vision Acquisition Software provides drivers and utilities for acquiring, displaying and saving images from supported camera interfaces. NI frame grabbers generally use the NI-IMAQ driver included with the software package.
NI Measurement & Automation Explorer can be used to detect supported devices, associate camera files, configure acquisition settings and test image capture.
Image acquisition and image analysis are different software functions:
Vision Acquisition Software: Connects to supported cameras and acquires images.
Vision Development Module: Provides image-processing, measurement and machine vision functions for custom applications.
Vision Builder for Automated Inspection: Provides a configurable environment for building and deploying inspection sequences.
Before purchasing legacy vision hardware, verify:
Vision Acquisition Software version
NI-IMAQ support for the exact frame grabber
LabVIEW or development-environment compatibility
Windows and operating-system support
32-bit or 64-bit application requirements
Availability of the correct camera file
Vision Development Module or Vision Builder licensing
PCI Frame Grabber Compared with Direct Camera Interfaces
Interface
Dedicated Frame Grabber
Typical Cable Distance
Primary Selection Reason
Analog Video
Required
Application dependent
Compatibility with legacy industrial cameras
Camera Link
Required
Relatively short without extension technology
Deterministic high-speed image transfer and precise triggering
GigE Vision
Normally uses a compatible Ethernet interface
Longer network-based connection
Distributed cameras and easier cable routing
USB3 Vision
Normally uses a compatible USB host controller
Shorter direct connection
Compact, high-throughput desktop acquisition
IEEE 1394
Uses a compatible FireWire controller
Interface dependent
Maintenance of older digital camera systems
Typical PCI Vision Acquisition Applications
Automated optical inspection
Electronic assembly inspection
Semiconductor wafer and package inspection
Surface and defect detection
Barcode and optical character recognition
Dimensional measurement
Robotic guidance and alignment
High-speed line-scan inspection
Scientific and microscopic imaging
Motion and event analysis
Medical and laboratory imaging
Packaging and label inspection
Web, film, paper and textile inspection
Legacy Frame Grabber Replacement
Replacing a legacy PCI vision acquisition board requires more than matching the camera connector. The replacement must support the camera’s electrical interface, data format, timing and software configuration.
Compare the following before approving a replacement:
Conventional PCI or PCI Express host interface
Analog or digital camera interface
Base, Medium, Full or extended Camera Link mode
Pixel clock and tap configuration
Pixel depth and color format
Area-scan or line-scan operation
Onboard memory and host-transfer bandwidth
Trigger and camera-control I/O
PoCL support
Camera and trigger cable pinout
Camera configuration file
NI-IMAQ and Vision Acquisition Software version
Operating-system and LabVIEW compatibility
Existing application source code
A newer frame grabber may require new Camera Link cables, trigger accessories, software versions and camera files. Validate frame integrity, trigger timing and sustained acquisition at the intended operating rate before production deployment.
PCI Vision Acquisition Procurement and RFQ Guide
Provide the following information for accurate frame-grabber selection and quotation:
Required NI model and complete part number
Camera manufacturer and complete model
Analog, Camera Link or other camera interface
Base, Medium, Full or extended Camera Link configuration
Area-scan or line-scan architecture
Image width, height and pixel format
Frame rate or line rate
Pixel clock and camera tap configuration
Monochrome or color acquisition
Trigger, encoder and exposure-control requirements
PCI or PCIe host-computer slot
Operating system and Vision Acquisition Software version
Required camera, trigger and synchronization cables
New or pre-owned hardware preference
Required quantity, destination and delivery date
For pre-owned frame grabbers, request device-recognition results, camera acquisition testing, trigger-I/O testing and physical inspection of the computer and camera connectors. Device recognition alone does not confirm reliable full-rate image acquisition.
FAQ
What is a frame grabber?
A frame grabber is an interface device that receives image data from an industrial camera, manages acquisition timing and transfers images into computer memory for processing or storage.
Does every machine vision camera require a frame grabber?
No. Analog and Camera Link cameras require compatible acquisition hardware. GigE Vision and USB3 Vision cameras normally use compatible Ethernet or USB host interfaces instead of a dedicated Camera Link frame grabber.
Can a Base Camera Link board acquire from a Full Camera Link camera?
Only if the camera can be configured to transmit a supported Base-mode output. A camera operating in Medium, Full or extended mode requires a frame grabber that supports that configuration.
Why is my Camera Link camera not automatically detected?
Camera Link is not generally a plug-and-play discovery interface. The system may require the correct camera configuration file, serial settings, tap mapping, pixel clock and acquisition parameters.
What is the difference between NI Vision Acquisition Software and the Vision Development Module?
Vision Acquisition Software provides camera connectivity and image acquisition. The Vision Development Module provides image-processing and analysis algorithms for building inspection applications.
Can conventional PCI frame grabbers be installed in PCIe slots?
No. PCI and PCI Express use different physical and electrical interfaces. The host computer must provide the correct slot type or the system must be migrated to compatible hardware.
Why are images lost during continuous acquisition?
Lost frames can result from insufficient PCIe bandwidth, slow image processing, too few buffers, storage limitations, an incorrect camera file or excessive competition for computer resources. Test the complete system at the intended frame rate and duration.
Can a frame grabber power the camera?
Only when both the frame grabber and camera support a compatible power-over-interface standard such as PoCL. Otherwise, the camera requires a separate power supply.
Related NI Test and Measurement Platforms
Review NI PCI and USB devices for additional computer-based acquisition hardware. For modular vision, synchronization and automated test systems, explore NI PXI systems. Additional measurement and control products are available in the NI product catalog.
NI PCI Vision Acquisition Devices from PXISOURCE
PXISOURCE supports engineers, machine builders, system integrators and procurement teams with NI frame-grabber selection, camera compatibility review, legacy replacement, cable matching and sourcing for machine vision and scientific imaging systems. Send the camera model, interface configuration, frame or line rate, host-computer slot and software version for a technically matched quotation.
Need help selecting an NI PCI vision acquisition device? Email [email protected] or contact PXISOURCE on WhatsApp.