Measurement support device, measurement supporting method, and computer program product

A measurement supporting method comprising:

• sequentially irradiating, by a measurement unit, an object with a light beam and sequentially measure a direction and a first distance to an irradiated point on the object;
• sequentially capturing images of the object irradiated with the light beam;
• calculating, by an image-capturing unit, when the direction and the first distance to the irradiated point are measured, a projection position on which the irradiated point is projected on each of the images by using the direction, the first distance, and calibration information that is based on calibration performed in advance between the measurement unit and the image-capturing unit;
• calculating a set of reprojection positions by reprojecting, on each of the images, a three-dimensional position that is based on each of the images sequentially captured;
• extracting, from the set of reprojection positions, a reprojection position on an image containing the projection position calculated from the irradiated point that is measured and captured within a certain time period;
• calculating a second distance between the reprojection position and the projection position;
• determining to which category the second distance belongs;
• and
• causing, when the determined category indicates continuation of measurement, an informing unit to inform of informing information that prompts to direct the measurement unit to irradiate the object with the light beam in a direction in which the second distance decreases.

A computer program product comprising a computer-readable medium containing a program executed by a computer, the program causing the computer to execute:

• sequentially irradiating, by a measurement unit, an object with a light beam and sequentially measure a direction and a first distance to an irradiated point on the object;
• sequentially capturing images of the object irradiated with the light beam;
• calculating, by an image-capturing unit, when the direction and the first distance to the irradiated point are measured, a projection position on which the irradiated point is projected on each of the images by using the direction, the first distance, and calibration information that is based on calibration performed in advance between the measurement unit and the image-capturing unit;
• calculating a set of reprojection positions by reprojecting, on each of the images, a three-dimensional position that is based on each of the images sequentially captured;
• extracting, from the set of reprojection positions, a reprojection position on an image containing the projection position calculated from the irradiated point that is measured and captured within a certain time period;
• calculating a second distance between the reprojection position and the projection position;
• determining to which category the second distance belongs;
• and
• causing, when the determined category indicates continuation of measurement, an informing unit to inform of informing information that prompts to direct the measurement unit to irradiate the object with the light beam in a direction in which the second distance decreases.