[Retracted] Health Detection System for Sports Dancers during Training Based on an Image Processing Technology

Table 1

Comparison of wireless communication technologies.

	Wi-Fi	Bluetooth	ZigBee	RFID	NFC
Transfer speed	11–50 Mbps	1 Mbps	100 kbps	1 kbps	424 kbps
Communication distance	20–200 m	20–100 m	2–20 m	1–10 m	0–20 m
Frequency band	2.4 GHz	2.4 GHz	2.4 GHz	1–100 GHz	13.56 GHz
Power consumption	10–50 mA	20 mA	5 mA	10 mA	10 mA
Main application	PC, PDA	Car, multimedia	Wireless sensor	Barcode	Near field communication