Video signal processing device and projection-type display device

A video signal processing device comprising:

• a black stripe detector configured to detect, a black stripe region of an input video signal in which a part of an effective region is a black stripe region, and to generate black stripe information indicating the black stripe region;
• a keystone correction processor configured to implement keystone correction processing for the input video signal so as to correct a trapezoidal distortion when the input video signal is projected onto a screen, and to generate a keystone-corrected video signal;
• a black stripe information corrector configured to correct the black stripe information to corrected black stripe information based on keystone correction parameters when the keystone correction processor performs keystone correction processing for the input video signal, the corrected black stripe information indicating a corrected black stripe region owned by the keystone correction video signal;
• and
• a video signal processor configured to implement predetermined video signal processing for the keystone-corrected video signal by using the keystone-corrected video signal and the corrected black stripe information.