Why can linear array and area array cameras take photogrammetry?

In the field of machine vision, linear industrial camera is a special vision machine. Compared with the area array industrial camera, its sensor has only one row of photosensitive elements, which makes it possible to have high scanning frequency and high resolution. The typical application field of linear industrial camera is to detect continuous materials, such as metal, plastic, paper and fiber. The object to be detected usually moves at a uniform speed, and it is continuously scanned line by line by one or more industrial cameras to realize uniform detection of its entire surface. The image can be processed line by line, or an area array image composed of multiple lines can be processed. In addition, linear industrial cameras are very suitable for measurement occasions, because of the high resolution of sensors.

For area camera, it is widely used, such as the measurement of area, shape, size, position and even temperature. The advantage of area array camera is that it can obtain two-dimensional image information and the measured image is intuitive. The disadvantage is that the total number of pixels is large, but the number of pixels per line is generally less than that of linear array, and the frame rate is limited. The advantage of linear camera is that it can make many one-dimensional pixels, but the total number of pixels is less than that of area array industrial camera, and the pixel size is flexible and the number of image frames is high, which is especially suitable for the measurement of one-dimensional dynamic targets.

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