A method and apparatus for connecting a trailing end of a cardboard or paper web running off an unwinding roll with a leading end of a new wound roll. An in-vivo device and method for use thereof may include a sampling chamber and a gating mechanism. On a side of the opening is formed a notch that recesses parallel to the direction in which principal stress acts in a plane of the silicon substrate. A reel is coupled to and positioned in the housing. The method can also be extended to provide indications of Q, bit error ratio and optical signal-to-noise ratio within the signal. In this processing, the white balance is adjusted according to a white balance control signal generated on the basis of information about a state of illuminance onto an object picked up last time and stored in a data storing part.