The present disclosure pertains to an image processing device and method, data, and a recording medium configured so as to make it possible to improve non-visibility in detecting corresponding points.Corresponding points between a projection image that is projected by a projection unit, and an imaged image that is imaged by an imaging unit, are detected using a pattern-imaging image obtained by the imaging unit forming the image of a specific structured light pattern obtained by positioning a plurality of patterns, e.g., pattern 101-1, pattern 101-2, etc., that have the brightness distribution of Gaussian functions such as, e.g., curve 102-1 and curve 102-2, projected by the protection unit. The present disclosure can be applied to, e.g., an image processing device, a projection device, an imaging device, a projection imaging device, a control device, a projection imaging system, or the like.