A measuring device includes a square ruler body provided with a plurality of scales, a plurality of marking lines, and a plurality of counting numbers. The casing includes a frame body having a front face and two ends opened, a pair of caps to cover both ends of the frame body, and a light transmissive plate to cover the opened front face of the frame body 3. The fast response eject module has a tray control module for detecting a status of the eject button, and an ejection detection module for controlling the ejectinginserting of the CD tray according to the detected status of the eject button after the CD player is powered up and before the front-end module starts to work. The region graph is segmented responsive to the weights of the edges incident to the video regions to produce a new region graph having new volumetric video regions comprised of merged video regions of the first region graph. The ASIC includes an analog-to-digital converter and is implemented on a second substrate.