An image forming material comprising a support having thereon a layer composed of a Ge--S composition or a Ge--S--X composition wherein X represents at least one element selected from the group consisting of Al, Si, Mg, Ti, V, Mn, Co, Ni, Sn, Zn, Pd, In, Se, Te, Fe, I, P and O which undergoes a structural change capable of being detected optically, electrically or chemically upon exposure imagewise to light wherein the Ge--S or Ge--S--X composition layer has a thickness of at least about 300A an...

Disclosed is an image forming apparatus of a type, in which there is provided first and second electrically chargeable members, a first processing device to form a primary electrostatic latent image on the first chargeable member, a second processing device to form a secondary electrostatic latent image of the second chargeable member in accordance with the primary electrostatic latent image, to develop the secondary electrostatic latent image, and to transfer the thus developed image onto an im...

An image scanner includes a convey path for a document sheet, convey rollers for moving the document sheet along the convey path, an image sensor for reading an image from the document sheet while said document sheet passes in front of said image sensor, and a driving section for driving said convey rollers to move the document sheet forward. The driving section of the image scanner drives the convey rollers to move the document sheet backward it is detected that the document sheet has passed th...

An image recorder capable of recording an image by a predetermined line width with no regard to the operating conditions and ambient conditions by causing the line width of an image into coincidence with a predetermined referece line width. A driver controllably drives an exposing device in response to optical data. A line width sensor means the line width of a visible image developed by a developing device. Control means controls, in response to the line width sensed by the sensor, the driver s...

A method and apparatus for processing a first (e.g. half-tone) image constituted by a second (e.g. continuous tone) image convolved with a periodic (screen) function, to produce the second image is described. The invention is particularly suited to handling digitally represented half-tone images. The apparatus comprises a microcomputer (17) for determining digital data defining a frequency filter characteristic adapted to suppress the frequency or frequencies of the periodic function. A fast Fou...

An image synthesizer of an image editing apparatus not only stores image data of two or more source images and includes a display device for displaying an image according to received image data, but also is provided with an address generator which, controlled by a data processor, transmits address signals sequentially to have a synthesized image of these source images displayed such that the individual source images appear superposed and transparent to each other. Each pixel of the display devic...

The envelope of the image intensifier is principally a glass cylinder closed at one end to support the viewing screen and having a sealing land at the other end with a series of apertures spaced thereabout. This end of the envelope is closed by a glass cap secured to the sealing land by a glass to glass seal. The photocathode has a supporting frame dimensioned to be positioned within the principal envelope section and having threaded mounting bushings in radial alignment with the apertures in th...

A method and apparatus for processing digital data representing the color content of abutting blocks of pixels defining an image. The method comprises, for each block (i) determining a measure of the variation in color content of pixels in the block; and, (ii) if the variation lies within a predetermined range, applying a compression algorithm to the digital data defining the block.

This invention is directed to an apparatus that plots an orthogonal projection of a photograph or similar image which was taken at an angle to the earth's surface. A stylus is used to outline the image which is to be rectified. The x and y cartesian coordinates of the stylus position are fed to an analog computer together with data relating to the camera's position at the time the image was taken. The computer, utilizing trigonometric relationships, calculates rectified equivalents of the X, y c...

An image sensor includes charge storage regions which gradually store charges corresponding to the amount of light received, a plurality of image transfer elements which gradually transfer the charges, and transfer gates which transfer the charges in the charge storage regions to the charge transfer elements. The image sensor provides further a device which changes an electric potential of an electrode of the charge storage regions in accordance with the amount stored of the charges, and a devic...