Pillsbury Madison & Sutro Intellectual Property Group
Video signal processor for generating a progressive scanning format signal
 A video signal processor for preventing image damage resulting from when a first signal and a second signal are converted into each other. When a first signal (an interlaced scanning format signal) is inputted, according to a mode discriminating signal from a mode discriminator, a mixer/selector receives the motion detecting signal from the mode discriminator, adaptively mixes both outputs of a delay circuit and a line interpolating filter (IPF) and uses the combined outputs as an interpolation signal. When a second signal (a progressive scanning format signal converted to an interlaced scanning format signal) is inputted, the mixer/selector selects either the output of the second signal or the output of a delay circuit according to the mode discriminating signal and the field indexes from the mode discriminator and makes it as an interpolation signal. When an input signal is converted from a first signal to a second signal, the mixer/selector receives the motion detecting signal from the mode discriminator and selects the output from the line interpolating filter as an interpolation signal (intra-field interpolation) for at least one field of the changed-over signal according to the mode discriminating signal from the mode discriminator. 
Kabushiki Kaisha Toshiba
H H
H04N H04N
inventional additional
Yoshihiko Hisakatsu
Ogawa Ito