Projector and projector control method
View Patent ↗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.
1. A projector that projects images on a projection object, the projector comprising:
a zoom lens for which it is possible to change the projection scope of the images projected onto the projection object;
an imaging unit for imaging the projected specified images; and
an imaging control unit for performing exposure adjustment in the imaging unit, and
wherein the imaging control unit sets an exposure calculation object scope for the imaged image for which an exposure calculation value is to be calculated based on the zoom lens zoom volume, calculates the exposure calculation value from the imaged image for the set exposure calculation object scope, and performs the exposure adjustment so that the calculated exposure calculation value is approximately equal to a specified exposure target value.
2. The projector in accordance with claim 1 , wherein the imaging control unit may also be made so that when the zoom volume is a second zoom volume that is larger than a first zoom volume for the exposure calculation object scope when the zoom volume is the first zoom volume, the exposure calculation object scope is set to be bigger.
3. The projector in accordance with claim 1 , further comprising:
a specified exposure calculation object scope setting table that is prepared for the specified image and notes the relationship between the zoom volume and the exposure calculation object scope, and
wherein the imaging control unit references the exposure calculation object scope setting table and sets the exposure calculation object scope based on the zoom volume.
4. The projector in accordance with claim 1 , further comprising:
a shift volume change unit for changing a shift volume from a reference position of an optical axis of the projection optical system, and
wherein the imaging control unit further sets the exposure calculation object scope based on the shift volume.
5. A projector that projects images on a projection object, the projector comprising:
a zoom lens for which it is possible to change a projection scope of a specified image projected on the projection object;
an imaging unit for imaging the projected specified image; and
an imaging control unit for performing exposure adjustment in the imaging unit, and
wherein the imaged image has a high gradation area with a relatively high gradation value and a low gradation area with a relatively low gradation value, and the imaging control unit derives specified parameters relating to the area of the high gradation area from the imaged image, sets an exposure calculation object scope for the imaged image for which an exposure calculation value is to be calculated based on the derived parameters, calculates the exposure calculation value for the set exposure calculation object scope from the imaged image, and performs the exposure adjustment so that the calculated exposure calculation value is approximately equal to a specified exposure target value.
6. The projector in accordance with claim 5 , further comprising:
an exposure calculation object scope setting table that is prepared for the specified image and notes the relationship between the parameters and the exposure calculation object scope, and
wherein the imaging control unit references the exposure calculation object scope setting table and sets the exposure calculation object scope based on the parameters.
7. The projector in accordance with claim 5 , further comprising:
a shift volume change unit for changing a shift volume from a reference position of an optical axis of the projection optical system, and
wherein the imaging control unit further sets the exposure calculation object scope based on the shift volume.
8. A control method for a projector that projects images on a projection object, the projector comprising: a zoom lens for which it is possible to change the projection scope of the image projected on the projection object; and an imaging unit for imaging the projected image, the control method comprising the steps of:
(a) setting an exposure calculation object scope for the imaged image for which an exposure calculation value is to be calculated based on a zoom lens zoom volume; and
(b) calculating the exposure calculation value for the set exposure calculation object scope from the imaged image, and performing exposure adjustment in the imaging unit so that the calculated exposure calculation value is approximately equal to a specified exposure target value.
9. A control method for a projector that projects images on a projection object, the projector comprising: a zoom lens for which it is possible to change the projection scope of an image projected on the projection object; and an imaging unit for imaging the projected image, the imaged image comprising a high gradation area with a relatively high gradation value and a low gradation area with a relatively low gradation value, the control method comprising the steps of:
(a) deriving specified parameters relating to the area of the high gradation area from the imaged image;
(b) setting an exposure calculation object scope for the imaged image for which an exposure calculation value is to be calculated based on the derived parameters; and
(c) calculating the exposure calculation value for the set exposure calculation object scope from the imaged image, and performing exposure adjustment in the imaging unit so that the calculated exposure calculation value is approximately equal to a specified exposure target value.