If your scanning speed is lower than expected:

The most common contributor to slow scanning speed is the specification of the host PC. In particular, please check the following:

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  • As discussed above, servo-controlled linear galvanometers are limited in their scanning speed due to inertia and, therefore, can only raster-scan a specimen at image acquisition rates that typically range from 1 to 5 images per second at standard frame sizes. In order to achieve video rates, the slower linear galvanometer used for horizontal line scanning can be replaced with a much faster resonant scanning galvanometer that vibrates at fixed frequency and is the rotational equivalent of a tuning fork. In resonant galvanometers (also known as counter rotation scanners; CRS), the energy stored in a torsion spring or rod assembly is used to oscillate the mirror in a sinusoid manner. These devices cycle at a resonant frequency on the order of 4 to 8 kilohertz, often close to a proportional fraction of the National Television System Committee (NTSC) video standard horizontal frequency of 15,750 lines per second. When a resonant scanner operating at 7,900 Hertz is used to acquire 512 lines that are progressively scanned in a bidirectional orientation (odd lines are left-to-right and even lines are right-to-left), the result is an individual line period of approximately 125 microseconds and image capture rates on the order of 30 frames per second.

    Virtually all document scanners support both the TWAIN and ISIS driver standards. TWAIN is more common and is usually the only driver provided with consumer scanner models. ISIS is the driver standard developed by Pixel Translations. ISIS provides a more standardized interface for high-speed scanners, and is often required to scan at the scanners rated speed.

  • Capture various types of document types accurately and efficiently with the DR-F120: a compact all-in-one scanning solution that offers both an automatic document feeder (ADF) and flatbed. You can save yourself valuable time using the 50-sheet document feeder, with its faster 20ppm scanning speeds. The DR-F120 can be relied on to get through your work with a suggested daily volume of up to 800 scans.

    With galvanometer-based laser scanning confocal microscopes, the fastest scanning scenario involves using line scans to acquire a row of pixels along a single axis of the specimen with the fast-axis mirror while relegating the slow-axis mirror to selecting the appropriate location for scanning (Figure 2). In modern confocal instruments, the scan line is not constrained to the x-axis, but can be oriented in any lateral direction to include all specimen features of interest. The results are often plotted as a series of scans that are offset to enable visualization of fluorescence intensity changes with time. This approach can produce high-speed scans, but is limited in its ability to detect events that might occur in other regions of the specimen. Another pitfall of fast line-scanning is that the dwell time on each pixel is generally insufficient to excite all of the detectable fluorescence, especially with specimens that have poor target abundance. In addition, the photomultipliers used in confocal microscopy have a quantum efficiency ranging from approximately 15 to 40 percent, so as scanning speeds increase, the number of detected photons per pixel may drop in some specimens to a level that is obscured by the noise floor of the photomultiplier.

    UBG-04LX-F01

    FDA approved
    SOKUIKI sensor for intelligent robots

    Scanning speed is 4 times faster than URG-04LX, providing better performance for autonomous robots.

  • Typically, higher quality means lower performance, but the iX500 maintains a double sided scanning speed of up to 25 pages per minute even at 300 dpi in Color!

    The modified GE medical scanner in the speed|scan atlineCT system uses Helix multi-line technology. A gantry with an x-ray tube and corresponding multi-line x-ray detector rotates around the workpiece, which is being passed through the gantry on a conveyor belt. The workpieces are scanned at speeds up to several centimeters per second and are automatically assessed with the aid of GE's own speed-optimized evaluation algorithms.

Problems about the scanning speed and OCR function

Tenable often receives requests for advice and strategies to help very large organizations decrease their scanning time. Readers should keep in mind that from Tenable's point of view, a "large" organization is someone with multiple Class B networks and more than 1 million items reported by Nessus. A basic concept to keep in mind when modifying how scans run is that there is a balance between scanning speed, thoroughness and invasiveness. For example, one may simply be able to decrease scan speed times by decreasing the number of tests performed. The scan happens faster but is not as thorough. This blog entry details some strategies that can help decrease scanning times with Nessus for very large networks.