A.V. Bogoslovskiy, A.N. Chetvertakov, E.A. Bogoslovskiy, I.V. Zhigulina

At the decision of many practical problems of technical sight it is necessary to define the moment of occurrence of object on the image. Especial importance is got by such possibility in cases of the minimum contrast of object concerning a background when it is inconvenient or it is impossible to establish visually. In work it is shown that contrast of objects on the image doesn't influence by sight an initial form of function of efficiency, under condition of elimination of constant making brightness.