1/23/2024 0 Comments Scanner image capture![]() ![]() The CIS devices in our check scanners are much simpler, designed to capture pixels at a fixed distance immediately in front of them – which is why the correct technical term for them is “sensors.” Line scan cameras mean no gaps in microfilm The difference between the image sensors used in our microfilm scanners and our check scanners is that our microfilm devices use cameras that capture images at variable speeds and distances, and which use lenses to focus. Just like with check scanners, the continuous-feed process is simply much faster. The same principle is at work with our bulk microfilm scanners, like the nextScan Eclipse or FlexScan. These are the high-speed machines made to read a whole roll of film in one pass, or to continuously capture a whole sheet of microfiche. (Check scanners actually use their own unique technology – called a Contact Image Sensor, or CIS – which is not really a “camera” at all. In the check scannersmade by our parent company, Digital Check, for example, a regular camera wouldn’t work at all: Waiting for each check to stop, be photographed, and get out of the way would take a prohibitive amount of time for a machine that routinely feeds 200 items per minute. The TS500 check scanner uses two line scan sensors to capture the front and back of a check in continuous motion. Using an area scan camera means you stop, take a picture, stop, take another picture, and so on – which not only limits the speed quite a bit, but also results in a series of fixed-size images that have to be stitched together. In the image-capture business, line scan cameras are useful when you’re trying to read a lot of items in a row without stopping, or if you’re trying to capture a particularly long image, like a continuous strip of film. If you were using a line scan camera, it would be a camera with a resolution of 1×4640 pixels that took 3480 separate pictures. For example, the 16 MP resolution on your phone means a regular camera that captures of 4640×3480 pixels. This also means that camera resolutions and megapixels don’t apply to line scan cameras in the way you’re used to them. ![]() ![]() This is much different from a regular camera (also called an “area scan camera”), which takes still photos of a specific two-dimensional area.Īn easy way to visualize the difference is that a regular, area scan camera takes a single picture of a square or rectangle all at once, while a line scan camera would take hundreds of 1D pictures in a row and form them into a picture of that same 2D area. Simply put, a line scan camera is a strip that captures one row of pixels at a time in quick succession, while either the camera is moved over an object, or the object is moved under the camera. What is a line scan camera? What’s the difference between a line scan camera and a regular camera? And why would you use one?Īs a maker of document-capture devices, we get these questions pretty often – especially since we manufacture products that use both kinds of cameras. ![]()
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