Abstract: In a method for modifying the resolution of an image obtained by digitising a real image, the digitised image includes a plurality of pixels of a particular intensity. The outlines in the digitised image are studied and isolated and additional pixels are created by interpolation of the intensities of original pixels located on one side of an outline to form an image with a modified resolution. The studying of outlines is achieved by locating, for close pixels, the intensity transitions representative of a gradient exceeding a particular threshold. The method is utilized for modifying the image resolution of facsimile machines.

Abstract: An item of office equipment, such as a facsimile machines, is provided having image analysis and laser printing capabilities with a shared mechanical image scanning apparatus. Embodiments include a single assembly with an analysis head and a laser emitting source disposed facing each other, a revolving mirror interposed between them, and first and second returning mirrors disposed symmetrically with respect to a line along which the analyzing head and the laser emitting source are disposed, such that the revolving mirror is located substantially at a point constituting an operational centre of symmetry of the single assembly. This symmetrical design allows the single analysis/printing assembly to be structurally simple and compact, enables the number of photosensors and LEDs necessary for image analysis to be reduced to as few as one of each, and eliminates the need for analog shift registers, thus decreasing the cost, size and complexity of the device.

Abstract: Line head thermal printing apparatus including a plurality of printing heating elements (2) designed to print, under the control of individual activation elements (7, 8) and by means of memory points (6; 46) of a printing register (5; 45), successive lines of points on a medium to be printed which is driven in advance against the head (1), which apparatus includes elements (10; 40) for individual write addressing of the memory points (6; 46).

Abstract: Method for controlling a line head of a thermal printing apparatus in which heating elements (2; 102) of the head (1; 101) are activated for printing a line of points on a printing medium, whereinthe positions of the heating elements (2; 102) to be activated are stored in memory,a predetermined number (N) thereof are selected, while locating and storing the positions thereof, and activated,and, after deactivation, the preceding step is repeated for points to be printed with positions not yet located,until all the points of the line to be printed have been printed, before advancing the printing medium.

Abstract: Printing apparatus including a printing head (1), which apparatus comprises a buffer memory (7), designed to be filled, at a defined speed, by data representing lines to be printed on a printing medium (11) and to be emptied line by line for each printing of a line by the head, and computation member (6) designed to determine, prior to the printing of each line, the volume of buffer memory (7) remaining available (L-xi), to determine therefrom a printing speed (Xj) of the line in question and accordingly to control member (3) for adjusting the printing speed (Xj) of the head (1).

Abstract: The apparatus comprises a light source, generally a laser diode, providing beam that is modulated by an input signal and is controlled for scanning, at a rate fixed by a clock, along a generatrix line of a photosensitive drum which is rotated by a motor; it further includes a memory for storing input data representing successive pixels of all lines in a page which were scanned for transmission, and a computer for determining the length to be reproduced of the transmitted document, and for determining the width, necessary to avoid truncating the infor mation contained in any of the scan lines, in the width direction. The computer calculates the minimum vertical reduction ratio Rv and the minimum horizontal reduction ratio Rh that should be adopted in order to enable the useful information to be reproduced in length and width and selects the smaller ratios.