Projection-type image display system, projector, information storage medium, and image projection method

A projection-type image display system comprising:

• a sensing section which senses a projection target area and outputs sensing information;
• a detection section which performs color-distribution detection based on the sensing information and outputs detection information which indicates color distribution in a sensed image;
• a projectable area determination section which determines a projectable area which has no obstructions within the projection target area, based on the detection information;
• a projection area selection section which selects a projection area within the projectable area, based on a user selection or a predetermined reference;
• an adjustment section which outputs projection size control information to an image projection section, in such a manner that an image is displayed on the projection area,
• the image projection section projecting the image onto the projection area, based on input image information,
• wherein the image projection section has a projection size adjustment section that adjusts a projection size by adjusting a lens zoom ratio to project the image onto the projection area, based on the projection size control information, and
• wherein the projection size adjustment section adjusts the lens zoom ratio for projecting the image onto the projection area in such a manner that the projection size becomes a minimum size including the projection area selected by the projection area selection section.

A projector comprising:

• a sensing section that senses a projection target area and outputs sensing information;
• a detection section that performs edge detection based on the sensing information and outputs detection information which indicates edge in a sensed image;
• a projectable area determination section that determines a projectable area which has no obstructions within the projection target area, based on the detection information;
• a projection area selection section that selects a projection area within the projectable area, based on a user selection or a predetermined reference;
• an adjustment section that outputs projection size control information to an image projection section, in such a manner that an image is displayed on the projection area,
• the image projection section projecting the image onto the projection area, based on input image information,
• wherein the image projection section has a projection size adjustment section that adjusts a projection size by adjusting a lens zoom ratio to project the image onto the projection area, based on the projection size control information, and
• wherein the projection size adjustment section adjusts the lens zoom ratio for projecting the image onto the projection area in such a manner that the projection size becomes a minimum size including the projection area selected by the projection area selection section.

A projector comprising:

• a sensing section which senses a projection target area and outputs sensing information;
• a detection section which performs color-distribution detection based on the sensing information and outputs detection information which indicates color distribution in a sensed image;
• a projectable area determination section which determines a projectable area which has no obstructions within the projection target area, based on the detection information;
• a projection area selection section which selects a projection area within the projectable area, based on a user selection or a predetermined reference;
• an adjustment section which outputs projection size control information to an image projection section, in such a manner that an image is displayed on the projection area,
• the image projection section projecting the image onto the projection area, based on input image information,
• wherein the image projection section has a projection size adjustment section that adjusts a projection size by adjusting a lens zoom ratio to project the image onto the projection area, based on the projection size control information, and
• wherein the projection size adjustment section adjusts the lens zoom ratio for projecting the image onto the projection area in such a manner that the projection size becomes a minimum size including the projection area selected by the projection area selection section.

A tangible computer-readable storage medium that stores a program for image projection, the program causing a computer to execute:

• a sensing code segment that senses a projection target area and outputs sensing information;
• an edge detection code segment that performs edge detection based on the sensing information and outputting detection information which indicates edge in a sensed image;
• a determining code segment that determines a projectable area which has no obstructions within the projection target area, based on the detection information;
• a selecting code segment that selects a projection area within the projectable area, based on a user selection or a predetermined reference;
• an outputting code segment that outputs projection size control information to an image projection code segment, in such a manner that an image is displayed on the projection area,
• the image projection code segment projecting the image onto the projection area, based on input image information,
• wherein the image projection section has a projection size adjustment section that adjusts a projection size by adjusting a lens zoom ratio to project the image onto the projection area, based on the projection size control information, and
• wherein the projection size adjustment section adjusts the lens zoom ratio for projecting the image in such a manner that the projection size becomes a minimum size including the projection area selected by the projection area selection section.

An image projection method comprising:

• sensing a projection target area and outputting sensing information;
• performing edge detection based on the sensing information and outputs detection information which indicates edge in a sensed image;
• determining a projectable area which has no obstructions within the projection target area, based on the detection information;
• selecting a projection area within the projectable area, based on a user selection or a predetermined reference;
• outputting projection size control information to an image projection section, in such a manner that an image is displayed on the projection area;
• and
• projecting the image onto the projection area, based on input image information,
• wherein the image projection section has a projection size adjustment section that adjusts a projection size by adjusting a lens zoom ratio to project the image onto the projection area, based on the projection size control information, and
• wherein the projection size adjustment section adjusts the lens zoom ratio for projecting the image onto the projection area in such a manner that the projection size becomes a minimum size including the projection area selected by the projection area selection section.

A tangible computer-readable storage medium that stores a program for image projection ,the program causing a computer to execute:

• a sensing code segment that senses a projection target area and outputs sensing information;
• a color-distribution detection code segment that performs color-distribution detection based on the sensing information and outputting detection information which indicates color distribution in a sensed image;
• a determining code segment that determines a projectable area which has no obstructions within the projection target area, based on the detection information;
• a selecting code segment that selects a projection area within the projectable area, based on a user selection or a predetermined reference;
• an outputting code segment that outputs projection size control information to an image projection code segment, in such a manner that an image is displayed on the projection area,
• the image projection code segment projecting the image onto the projection area, based on input image information,
• wherein the image projection section has a projection size adjustment section that adjusts a projection size by adjusting a lens zoom ratio to project the image onto the projection area, based on the projection size control information, and
• wherein the projection size adjustment section adjusts the lens zoom ratio for projecting the image in such a manner that the projection size becomes a minimum size including the projection area selected by the projection area selection section.

An image projection method comprising:

• sensing a projection target area and outputting sensing information;
• performing color-distribution detection based on the sensing information and outputting detection information which indicates color distribution in a sensed image;
• determining a projectable area which has no obstructions within the projection target area, based on the detection information;
• selecting a projection area within the projectable area, based on a user selection or a predetermined reference;
• outputting projection size control information to an image projection section, in such a manner that an image is displayed on the projection area;
• and
• projecting the image onto the projection area, based on input image information,
• wherein the image projection section has a projection size adjustment section that adjusts a projection size by adjusting a lens zoom ratio to project the image onto the projection area, based on the projection size control information, and
• wherein the projection size adjustment section adjusts the lens zoom ratio for projecting the image onto the projection area in such a manner that the projection size becomes a minimum size including the projection area selected by the projection area selection section.