The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 21, 2009
Filed:
Jul. 07, 2005
Noriaki Miyasaka, Okaya, JP;
Noriaki Miyasaka, Okaya, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
For a projector, a CPU references an exposure calculation object scope setting table stored in an exposure calculation object scope setting table storing unit, and sets the exposure calculation object scope based on a zoom volume detected by a zoom volume detector. An exposure calculation object scope for each zoom volume is stipulated in the exposure calculation object scope setting table. Next, an imaging control unit images an adjustment pattern image projected onto a screen by a CCD module, and calculates an exposure calculation value for the set exposure calculation object scope. Then, the imaging control unit controls at least one item among the shutter speed, gain, and aperture for the imaging unit to perform exposure adjustment so that the exposure calculation value is about equal to a specified exposure target value. By doing this, even when the zoom volume of the zoom lens changes, it is possible to approximately maintain the average value of the gradation values of the adjustment pattern image for the imaged image at a desired gradation value.