1. An image projecting device, comprising: a projecting part configured to project an image for calibration onto a projection object; an image capturing part configured to capture an image of an area including the projection object with a projected image for calibration; a binary image producing part configured to calculate plural first thresholds corresponding to plural first divided areas provided by dividing the area, based on a captured image, and to produce a binary image of the captured image, based on the first thresholds; and a corresponding point sampling part configured to sample corresponding points between the image for calibration and the binary image.