| US 7,542,074 B2 | ||
| Photographed image projection device which sets a frame frequency of photographing by a camera based on movement in a photographed image | ||
| Keiichi Sakurai, Akishima (Japan); Akihiko Nagasaka, Musashimurayama (Japan); Tetsuji Makino, Ome (Japan); Yoshihiro Teshima, Tokorozawa (Japan); and Kazumasa Morichika, Ome (Japan) | ||
| Assigned to Casio Computer Co., Ltd., Tokyo (Japan) | ||
| Filed on Aug. 27, 2004, as Appl. No. 10/928,226. | ||
| Claims priority of application No. 2003-305575 (JP), filed on Aug. 28, 2003. | ||
| Prior Publication US 2005/0047775 A1, Mar. 03, 2005 | ||
| Int. Cl. H04N 5/228 (2006.01) | ||
| U.S. Cl. 348—222.1 [348/208.99] | 6 Claims |
| 1. A photographed image projection device comprising:
a camera which photographs an object and outputs image data;
an image processing unit which carries out image processing on the image data output by the camera;
a projection unit which projects an image based on the image data processed by the image processing unit; and
a control unit which controls the camera, the image processing unit and the projection unit, so that a frame frequency of
the image data output by the camera is switchable to at least two frequencies,
wherein the control unit comprises a movement determining section which determines whether an image of the image data output
by the camera has movement;
wherein the control unit sets in advance, a high/low frame frequency of the image data output by the camera such that: (i)
when the movement determining section determines that the image of the image data output by the camera has movement, the control
unit controls the camera, the image processing unit, and the projection unit so that the image data is output by the camera
with a high frame frequency, and (ii) when the movement determining section determines that the image of the image data output
by the camera does not have movement, the control unit controls the camera, the image processing unit, and the projection
unit so that the image data is output by the camera with a low frame frequency and so that an amount of data corresponding
to a given image increases to thereby achieve a higher image resolution;
wherein the movement determining section obtains an image change amount of the image of the image data output by the camera;
and
wherein the movement determining section determines that the image of the image data output by the camera: (i) has movement,
if the image change amount is at least equal to a first predetermined threshold amount; (ii) has a slight movement, if the
image change amount is lower than the first predetermined threshold amount and at least equal to a second predetermined threshold
amount; and (iii) does not have movement, if the image change amount is lower than the second predetermined threshold amount.
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