A handheld electronic device that includes two or more multi-axis distance measurement sensors for simultaneously measuring distance from two or more reference points in space. The device is used to locate a target point on a surface at the predetermined distances from the two or more reference points. The device can further include a marking unit to mark the target point on the surface.

A handheld electronic device that includes two or more multi-axis distance measurement sensors for simultaneously measuring distance from two or more reference points in space. The device is used to locate a target point on a surface at the predetermined distances from the two or more reference points. The device can further include a marking unit to mark the target point on the surface.

This image processing device includes: a detection object including cells having first cells capable of reflecting emitted light and second cells incapable of reflecting the emitted light, the cells being squares or rectangles, the first cells and the second cells being arranged in an aa or ab (where a, b=3, 4, 5, 6, . . . ) matrix on a two-dimensional plane; and a detector including: an illuminator emitting light; imagers imaging, by a camera, light reflected from the first cells after the first cells and the second cells constituting the detection object are illuminated with the light emitted from the illuminator; and a calculator obtaining information set on the detection object 11, based on imaged data items taken by the imagers. Such a configuration can accurately identify a compact marker and measure the distance, and achieve a system inexpensively.

To perform three-dimensional measurement of an object with high accuracy, a dot pattern is generated by a determination process of determining a reference position according to a rule defined by a Poisson disk sampling algorithm, a selection process of selecting one of a plurality of arrangement patterns indicating at least one or more dot arrangements, an arrangement process of arranging dots based on the arrangement pattern selected for the reference position, and an iterative process of performing the above processes a plurality of times, a projection device is controlled to project projection light including the dot pattern onto the object, an image capturing device is controlled to image-capture the object onto which the projection light is projected from two directions to acquire two captured images, parallax information is calculated about the acquire two captured images, and a three-dimensional shape of the object is specified based on the calculated parallax information.

A handheld electronic device that includes two or more multi-axis distance measurement sensors for simultaneously measuring distance from two or more reference points in space. The device is used to locate a target point on a surface at the predetermined distances from the two or more reference points. The device can further include a marking unit to mark the target point on the surface.

A handheld electronic device that includes two or more multi-axis distance measurement sensors for simultaneously measuring distance from two or more reference points in space. The device is used to locate a target point on a surface at the predetermined distances from the two or more reference points. The device can further include a marking unit to mark the target point on the surface.

To perform three-dimensional measurement of an object with high accuracy, a dot pattern is generated by a determination process of determining a reference position according to a rule defined by a Poisson disk sampling algorithm, a selection process of selecting one of a plurality of arrangement patterns indicating at least one or more dot arrangements, an arrangement process of arranging dots based on the arrangement pattern selected for the reference position, and an iterative process of performing the above processes a plurality of times, a projection device is controlled to project projection light including the dot pattern onto the object, an image capturing device is controlled to image-capture the object onto which the projection light is projected from two directions to acquire two captured images, parallax information is calculated about the acquire two captured images, and a three-dimensional shape of the object is specified based on the calculated parallax information.