Projection-type video display device

A projection-type video display apparatus comprising:

• a video projector configured to display a plurality of color images in time division based on an input image and to project a video based on the displayed color images;
• a color corrector configured to perform color correction on the input image;
• and
• a time division period detector configured to detect a time division one period or N times period of the time division one period of the projected video based on an imaged projected video obtained by an internal imaging apparatus or an external imaging apparatus connected by a wire or a wireless connection and imaging the projected video,
• wherein the color corrector performs the color correction on the input image based on color information of a video corresponding to the detected time division one period or the detected N times period of the time division one period, and
• wherein the internal imaging apparatus or the external imaging apparatus supports global shutter method, and the time division period detector detects the time division one period or N times period of the time division one period by detecting a change in the color information of a predetermined region including a same coordinates between a plurality of frames of the imaged projected video.

A projection-type video display apparatus comprising:

• a video projector configured to display a plurality of color images in time division based on an input image and to project a video based on the displayed color images;
• a color corrector configured to perform color correction on the input image;
• and
• a time division period detector configured to detect a time division one period or N times period of the time division one period of the projected video based on an imaged projected video obtained by an internal imaging apparatus or an external imaging apparatus connected by a wire or a wireless connection and imaging the projected video,
• wherein the color corrector performs the color correction on the input image based on color information of a video corresponding to the detected time division one period or the detected N times period of the time division one period,
• wherein the time division period detector has a first mode corresponding to a rolling shutter method and a second mode corresponding to a global shutter method,
• wherein in the first mode, the time division period detector detects the time division one period or N times period of the time division one period by detecting a period in which the color information in the vertical direction is changed in one frame of the captured projected video,
• wherein in the second mode, the time division period detector detects the time division one period or N times period of the time division one period by detecting a change in the color information of a predetermined region including a same coordinates between a plurality of frames of the imaged projected video, and
• wherein either the first mode or the second mode is selected by an user of the projection-type video display apparatus.