Line Scan Camera: Ideal Line Rate and Movement Speed, Accuracy required by customers
Customer requirements for accuracy
Generally customers say that the accuracy should reach 0.xmm, meaning that the image taken should be able to distinguish this pattern of 0.xmm in length or width.
In this way, the image algorithm or the human brain, when seeing this image, can find, identify and detect the 0.xmm pattern more easily.
Pixel accuracy, as shown in the figure below, is the length of a segment of the target being photographed, represented and expressed by how many pixels are projected
on that target. The distance of a pixel from an object determines the length (accuracy) it can express: it can be 0.1mm, or several meters, or even several light years (Weber telescope).
Pixels are all square, so that also determines, the X-directional accuracy = Y-directional accuracy
Ideal line frequency = motion speed / pixel accuracy
For example, an object, motion speed 2000mm / s, pixel accuracy 0.1mm, then the ideal line frequency = 2000mm / s / 0.1mm = 20000 / s, that is, 20k (another layer of this formula,
is 2000mm, can be divided into how many 0.1mm)
If the object is 1000mm wide and the pixel accuracy is 0.1mm, taking into account the redundancy on both sides, the resolution = 1050/0.1 = 10500, i.e., with this accuracy, 10500 pixels
are needed for clear imaging of an object this wide