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- W2648405646 abstract "In this paper, a multilevel grey-scale visual coding scheme is proposed for data transmission from LCD screens to Android smartphone cameras. A computer equipped with an LCD screen acts as a data transmitter whereas the smartphones with cameras perform the task of receivers. The multilevel modulation of light intensities allows each visual symbol or dot to carry more number of bits, thus increasing the data rate. However, varying characteristic of smartphone cameras especially from the auto exposure function and the auto white balance function significantly interfere the symbol detection of smartphones. With the aid of pilot symbol insertion, the appropriate decision levels for the symbol detection can be effectively evaluated at the receiver without disabling the auto exposure function or the auto white balance function of cameras. To avoid the effects of saturation and nonlinearity in the detection, the brightness of the LCD should be kept between 20% and 80%. Besides, the lowest intensity level of the grey-scale coding should be higher than a threshold otherwise the receiver cannot effectively sense the present of the data transmission from the LCD screen." @default.
- W2648405646 created "2017-06-30" @default.
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- W2648405646 date "2017-05-01" @default.
- W2648405646 modified "2023-09-28" @default.
- W2648405646 title "Multilevel grey-scale visual coding for data transmission from LCD screens to Android smartphone cameras" @default.
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- W2648405646 doi "https://doi.org/10.1109/ictemsys.2017.7958759" @default.
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