| 摘要 |
The method involves using a camera (20) with a matrix array of e.g. 256 x 256 CCD image sensors (21) which deliver an analogue video signal (23) contg. pixel grey levels for digitisation (24). A microcontroller (26) operates on the image stored in memory (54) using a data bus (55) for the grey level signals and an address bus (56) for the pixel row and column numbers (43, 42). A grey level transformation rule is stored in a look-up table (52) which contains at least two different laws applying to distinct groups of pixels. Selection (50) is performed by the microcontroller.
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