The blurring has the same effect as, for instance, a mathematical low-pass filter. However, it should not be concealed that some applications are more robust if small interfering details are suppressed by blurring. When may the image be slightly out of focus?
Especially measurement and surface inspection applications for the detection of finest details and defects become more unreliable in this way: Sharp und blurry imagesĭecrease of contrast and loss of resolution of small details in the blurred image on the right The overall contrast decreases, and small details cannot be resolved any more. Improper focusing leads to loss of contrast and sharpness, which can complicate the optical detection of defects by means of the machine vision system. When and why must the image be absolutely sharp? For not very challenging tasks, such as part presence applications, this may be sufficient.
Then any aperture is selected temporarily and the lens ring is rotated back and forth until the image seems to be sharp: and then the software programming of the camera starts. Often the camera is simply screwed on and the image detail is adjusted visually via the monitor by slightly moving and tilting the camera.
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