As the technology of augmented reality (AR) is getting matured, the application of AR to various fields, especially in a creative manner, become an attractive research topic. The objective of this research is to propose a method for a halftonebased hidden marker for AR tracking system under infrared (IR) detection. Our design method is based on the ordered dithering and the characteristic of carbon black under IR. It provides AR system a novel solution for the marker design, which can make the human-computer interface become much more natural. The results show that the AR marker is invisible by human eyes, but appears under IR.It has many potential value-added applications for future AR systems.
A 131 GHz crass-coupled push-push voltage controlled oscillator (VCO) is realized in 90nm CMOS technology. It can be tuned from 129.8 i o 132 GHz, with an estimated phase noise of -108.4 dBc/Hz at 10 MHz offset. The oscillator provides a push-push output power of -15.2 dBm and a fundamental output power of c0.33 dBm, under core current of 20 mA from a 1-V supply voltage. Maximum gushpush and fundamental output powers are -11.4 dBm and +2.1 dBm, respectively. To the authors' knowledge, this is the highest frequency CMOS VCO ever reported.
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