Abstract: There is provided a gamma curve adjustment device for use in a gamma correction circuit that performs gamma correction of an image signal, wherein the device is used to adjust the gamma curve indicating the relationship of input tone values to output tone values. The gamma curve adjustment device comprises a user interface module configured to permit a user to specify, desired output tone values for a plurality of pre-established adjustment points on the gamma curve; and an adjustment module configured to adjust the gamma curve such that the output tone value at each adjustment point assumes the value specified through the user interface module. The plurality of adjustment points are established such that a differential of input tone values between a first set of two adjustment points situated adjacently on the gamma curve differs from a differential of input tone values between a second set of two adjustment points situated adjacently on the gamma curve.

Abstract: An object of the invention is to provide a light source driving method for supplying electric power to a light source of a projector, and and to provide a projector using this light source driving method. The projector has a lamp (2) as a light source for emitting light, a lamp driving electric power control section (3) as a light source driving section for supplying electric power for operating the lamp (2), an image pickup section (7) as an image obtaining section for receiving a projected image and obtaining image data to adjust the projected image, and a synchronous signal generating section (5) for generating a signal as an operation reference.

Abstract: To provide a light-source driving method for supplying power to a light source of a projector and a projector employing the light-source driving method there are provided a lamp-drive-power control section (3) as a light-source driving section for outputting a first drive waveform and a second drive waveform, and a high-current on-off switch section 5 as a current-control instructing section for making a controllable instruction to switch the first drive waveform and second drive waveform outputted from the lamp-drive-power control section (3).

Abstract: A projector includes an image projecting section that is structured to project an image according to an input image, to a virtual projection plane arranged in a predetermined positional relationship therewith, an imaged-information generating section that has an output-image taking section to take an output image projected to a real projection plane and outputs imaged information containing lightness information having a correlation to a lightness in accordance with an image taken, and a distortion correcting section that corrects a distortion, in an output image for the input images caused by an inclination of between the virtual and real projection planes, according to the imaged information.

Abstract: An image processing device for a projector including an image formation section that emits light of an image, and a projection system that projects the emitted light onto a projection surface.

Abstract: A projector in which an image signal is inputted to project an optical image corresponding to the image signal and display the image on a projection surface, the projector including: an optical modulation unit having an area capable of modulation where light can be modulated for modulating the light emitted from a light source in the area capable of modulation to form an optical image; a projection lens for enlarging and projecting the optical image formed in the optical modulation unit; a forming area changing unit capable of changing a size or a shape of a forming area for forming an optical image corresponding to the image signal in the area capable of optical modulation; an operation part capable of inputting location information indicating a projection location of the optical image corresponding to the image signal; and a forming area moving unit for moving the forming area on the basis of the location information inputted by means of the operation part when the forming area changed in size or shape by m

Abstract: A projector including a light modulating device which modulates light beams emitted from a light source according to image information to form an optical image, a projection optical device, the projection optical device including a projection lens which has a plurality of lenses and enlarges and projects the optical image onto the screen, a focal position changing unit, to perform focus adjustment on the image, a setting input unit through which automatic adjustment information for changing the focal position to an in-focus position where the projected image is in an in-focus state is input, and a focus adjustment control unit which controls the focal position changing unit until the projected image is in the in-focus state.

Abstract: The projector comprises an image forming panel that forms an effective panel image for modulating the light into an image light in an image forming area of a panel surface, and an image capturing unit for capturing a specific projection area wherein the image light corresponding to a specific area in the image forming area is projected. The projector calculates one or more edges of the outside perimeter lines of the screen and of the specific projection area by detecting plural points in a captured image. Based on the detection results, a post-correction image forming area is calculated, and trapezoidal distortion is corrected by forming the effective panel image within the post-correction image forming area. When only three or less of the four edges of the outside perimeter lines of the screen are detected, the projector calculates the post-correction image forming area based on the position and slope of the detected edge within the captured image.

Abstract: Aspects of the invention provide a projector for displaying an image on a projection surface. The projector can include a test pattern projecting unit that projects a predetermined test pattern on the projection surface, a focus changing unit that moves a focal point of the projector, an imaging unit that performs imaging the projected test pattern to generate a shot image, an indicator value calculating unit that calculates an indicator value relating to a focus state of the shot image varying with movement of the focal point, and a focus adjustment unit that performs focus adjustment for focusing the focal point on the projection surface using the indicator value. The test pattern including a first kind and a second kind of density areas alternately arranged and having different density with each other, and at least the first kind of density areas include a narrow area and a broad area.

Abstract: A projector displays an image on a projection surface. The projector comprises a light source, an image formation panel, a zoom adjusting module, and a keystone correcting module. The light source emits light. The image formation panel forms in an image formation area of a panel surface an effective panel image for modulating light emitted by the light source into effective image light representing an image. The zoom adjusting module adjusts zoom level of a zoom lens for enlarged projection of image light. The keystone correcting module corrects trapezoidal distortion of the image displayed on the projection surface by means of forming the effective panel image in a revised image formation area, the revised image formation area being part of the image formation area of the panel surface.