1. A method of isolation of figures in an image, in which the graphic information contained in the image is converted by means of a television camera to a video signal constituted by a succession of lines, each line being in turn constituted by an electrical analog signal having an amplitude which is variable in time, in which each line is then sampled sequentially at uniform time intervals so as to obtain an ordered series of points having associated numerical values which are a function of the level of blackening of the points of the initial image, and in which said ordered series of points is stored in a memory device, wherein said method consists in selecting a parent point forming part of an isolated figure of the image, wherein all those points of said figure in which the level of blackening on the image is higher than an adjustable threshold value are isolated automatically by marking with the aid of an isolating automaton coupled with said memory device, wherein all the marked points corresponding to said figure are extracted from the memory device and wherein said figure of the image is reconstituted from said points, whereupon the process of isolation is repeated for another figure, starting from another parent point.