Data Acquisition & Telemetry


Compact digital camera for machine vision applications

August 2004 Data Acquisition & Telemetry

The Basler 600f camera series was launched last year and has become an exceptionally successful camera family for machine vision applications.

These CMOS sensor-based cameras have an IEEE1394 (Firewire) interface, a compact housing, and can be operated at up to 100 frames/sec with progressive scan at 659 x 493 pixel resolution. The camera fully complies with DCAM, the specification for the operation of 1394-based digital cameras, which defines a characteristic set of features for industrial grade cameras.

The quality of the acquired image is the most important factor in achieving reliable performance in visual inspection and machine vision applications. Digital cameras have many advantages over analog cameras:

* Digital cameras exhibit superior image stability, progressive scan, much reduced pixel jitter, flexible image size and powerful triggering. Lower resolution images can be acquired at higher frame rates. Exposure time, gamma, gain, offset and white balance are controlled from the PC.

* Analog cameras generally give inferior image quality, as the transmission of the analog signal by cable and the conversion to digital by a frame-grabber results in image degradation and jitter. They usually operate at a fixed 50 Hz frame rate in interlaced mode, yielding 25 full frames per second. To achieve this, two frames are acquired and combined: one of all odd-numbered lines, then 20 ms later, the other of all even-numbered lines. If the object being viewed is moving, the odd and even frames are displaced relative to each other, which can result in an unusable image.

Smart features framework

To further enhance the power of their cameras, Basler is introducing its new smart features framework (SFF), which moves more power and pre-processing from the PC to the camera. The first cameras to have SFF are the A600f range. SFF will later be migrated to Baslers' A102f and its other firewire camera ranges. The SFF feature allows the transmission of both basic image data and additional parameters such as the position and size of the area of interest (AOI), which can be changed on the fly for fast tracking of objects.

Along with the pixel data for each captured image, a frame counter, a precise time stamp and a list of general parameter settings including absolute exposure time, gamma, gain, offset, and white balance values can be sent to the PC. Because the image content is over 99% of the data package, the effect on the camera frame rate is negligible. The cameras also feature user configurable I/O ports (four of each), which add flexibility to industrial applications.



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