A storage-type image converter of the photoconductor and liquid crystal kind comprises a photoconductive film arranged beside a film of a mixture of nematic-cholesteric liquid crystals; electrical bias means for successively applying to said films a direct write-in voltage and an alternating erase voltage, an auxiliary light source making it possible to recover the information stored, and stigmatic optical means being provided to project said information on to a viewing screen or on to a photogr...

An optical image is projected onto a planar surface of a photocathode that derives an electron beam replica of the image. A target electrode displaced relative to the photocathode so that it does not obstruct the optical image includes a planar surface for receiving and deriving an accurate replica of the electron beam image. The two planar surfaces are parallel. The electron beam image is focused on the target electrode by providing throughout a region that extends between the planar surfaces o...

An input screen of an image intensifier comprises an aluminum substrate with electrochemically deposited netty protrusions, a phosphor layer formed on the substrate and including a large number of columnar blocks defined by cracks extending from the tops of the netty protrusions toward the surface of the layer, and a photocathode deposited on the phosphor layer directly or through a protective layer.

An image intensifier comprises an evacuated tube envelope which accommodates a serial arrangement of a photocathode, an accelerating electrode having a hollow cylinder in which an element with a grid is disposed, said grid being placed on that end of the element which faces the photocathode, a focussing electrode made in the form of a hollow cylinder having a diameter equal to the diameter of the hollow cylinder of the accelerating electrode, an anode diaphragm, an electronic gate with a diaphra...

In an infrared image pickup device, an infrared image signal and a visible image signal are picked up from an object to be photographed, the infrared signal, the visible image signal and/or a visible profile image signal are transmitted in a time-division manner and are separated from each other, and an infrared image, a visible image, a visible profile image, an image obtained by superposing the visible image on the infrared image, and an image obtained by superposing the visible profile image ...

A composition capable of reducing image-offset when used in combination with color-forming compounds which are capable of forming colored images with color-developing coreactants. The composition comprises an aliphatic tertiary amine image-offset control agent. Color-forming compounds such as dithiooxamide, dithiooxamide derivatives and certain aromatic substituted hydrazones, may also be included in the composition. The invention when employed in the art of carbonless paper enables the producti...

An ommateal image projector of a type, in which a single or a plurality of rows of the so-called bar lenses having a longer length in the direction of its optical axis than the effective lens diameter thereof are arranged, each bar lens projecting a partial image of an object to be projected onto a mirror surface, and the partial image formed on this mirror surface forming again this partial image onto the image projecting surface by the same bar lens. The entire image of the object is formed on...

An improved image tube operable at higher voltage and gain with low noise levels wherein the electrodes include rolled end portions which extend away from the tube axis, and wherein all electrode surfaces are coated with light absorptive, low secondary electron emission characteristic, insulating material. Annular shields are disposed proximate an inlet and outlet tubulation to prevent deposition of alkali on the interior insulating ceramic envelope surfaces. An improved zoom electrode structure...

Processing of digitally-coded pictures to improve perceived quality without increasing transmission channel capacity, featuring dividing the video signal into a low, middle and high frequency signals (16, 26), finely quantizing the low frequency signal (18), adding pseudo-random noise (33) to the middle frequency signal prior to quantizing (28), enhancing (36) and adding pseudo-random noise (48) prior to coarsely quantizing (50) the high frequency signal. The pseudo-random signals are subtracted...

Pictures produced by a camera are corrected to eliminate the effect of camera shake or of unwanted movement of the camera relative to the subject being viewed. Using the apparatus of FIG. 1 the adjustments required for each frame of a cine film are established by displaying each frame on a screen 9 and using a light pen 10 to record the co-ordinates of two characteristic features, e.g. bright spots, on each frame. Circuitry 13, 14, 16, 17, 20, 21, 22, 23 calculates from these co-ordinates the co...