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The colour you see in the sky on cloudy nights is due to the reflection of city lights off the clouds. In rural areas, a cloudy night is, as you expected, significantly darker. However, the massive amount of light given off in urban areas reflects back to Earth when there is cloud cover. And so, you see a red-orange hue, similar to the overall colour ...


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This is really a very broad question; I will give you just a few pointers, but a full answer could fill a book. Yes, any 1D/2D pattern (barcode) scanner is looking at spatial variations in the received intensity; and it typically looks for "brighter/darker" to decide how to do the binary decoding ('1/0). Bar codes are constructed in such a way that they are ...



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