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| Videomicroscopy for special applications |
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| Electronic contrast enhancement |
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In TV cameras, the brightness information of an image is changed to an electric signal which can be influenced by means of amplifiers. If an image exhibits very poor contrast – e.g. a transparent single cell in a buffer solution – the contrast can be enhanced electronically. The first step is to subtract the DC component which corresponds to the homogeneously bright background. The weak residual signal then only contains the image modulation, which is amplified, resulting in many cases in a high-contrast image on the monitor.
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