Industrial cameras can be divided into interlaced cameras and progressive scan cameras according to scanning methods.
Most monitors and cameras scan in an interlaced manner, but in reality the human eye still looks like a smooth image. The camera typically acquires odd lines of the image. For the CCIR standard, it acquires even lines after 1/50 second. For the EIA standard, even lines are acquired after 1/60 seconds.
Most cameras are intermittently shifted, interlaced, and when used to capture moving objects, a comb effect occurs. To eliminate this effect, you can capture only half of the image (only odd or even rows), and if you want full resolution, you must use a Progressive Scan camera.
In machine vision applications, objects usually move very quickly. When using an interlaced camera, there may be objects moving between the two fields, and the result will be a blurred image, like double exposure or a comb effect on the vertical edges. To solve this effect, the interlaced camera can be set to scan only one field, so that the vertical resolution will be halved and the frame acquisition rate will be doubled. This operation of the camera is called field mode, or Interlaced output is useful for many machine vision applications.
The field mode also provides the benefit of doubling the sensitivity, obtained by the vertical pixel BINNING (pixel BINNING refers to a special readout mode of the CCD sensor, the sensor binds two or more pixels together to lock, accumulate from multiple pixels Charge summation), while increasing the frame rate, sensitivity, and signal-to-noise ratio, reduces the resolution. In applications that require full vertical resolution for fast moving objects, a progressive scan camera should be used.
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