Comet Labs WN591 Manual de usuario descargar pdf (Pagina 46)

Help! There is a comet in my computer! 43

Figure 25. Different versions of user interface for adjusting the camera settings. The main settings

are contrast / brightness, offset / gain, exposure time, binning.

When we are adjusting the camera and we have no image histogram available, we need to

make sure that the image that we see displayed on the screen is a replica of the grabbed

image and not changed by any display settings. In particular, we should check which LUT

is used (the LUT for display of actual grey values usually has the name “grey” or

“greyscale”). Another problem is that not only the camera, but also the display has contrast

and brightness settings. To see the actual grabbed image, the brightness and contrast of the

displayed image should be set to “neutral“(Figure 26). Because the way this is achieved

varies in different software packages, we have to check how to set our own software

correctly.

For accurate recording of comet images, any automatic corrections of the image that a

camera may feature have to be switched off. For example, the setting “gamma”, if

switched on (so that the gamma factor is not 1), distorts camera response away from

linearity.

Once the camera options are adjusted, it is best not to change them throughout the

experiment.

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Comet Labs WN591 Manual de usuario Pagina 46