Abbreviated method of a camera calibration for the purpose of distance measurement

An abbreviated method of a digital camera calibration for the purpose of using the results for distance measurement by means of photo images processing is described in the article. The method is based on processing photo images of horizontal or vertical basis of an arbitrary size and located only at the start and end points of a line with the known length. Photo images processing involves measurement of raster coordinates in pixels of the left and right or upper and lower ends of the basis using any raster graphics editor. It is found that there is a direct proportional dependence between the quantity product of such pixels and the distances corresponding to them, and these distances themselves. For the reasons given, formulas for calculating, with respect to the measured distance control, are derived. The procedure for calibrating the camera is described, and the results of comparing control measurements with the true values are produced. It is found that the designed calibration method provides sufficient accuracy for distance measurement by means photo images processing.