A colorimeter includes an objective for focusing an object image on a first half of a viewing screen. A standard light reference beam is projected onto the second half of the screen. A moving shutter alternately blocks the first half then the second half of the screen. A light detector is responsive to the alternating images on the screen as they pass through color filters. The detector output may provide information of spectral distribution or color deviation of the object, relative to the stan...

An image analyser for use in a line-by-line scanning system in which a field of an article is scanned to produce a video signal representative instantaneously of a point within that field. The analyser has n delay means connected in series where n is an integer divisible by 2, the video signal being applied to the input of the first delay means. The input of the first delay means and the output of each delay means other than the nth/2 delay means in the series, are connected to the inputs of an ...

A process for enhancing the optical density of images and the product resulting therefrom. The process comprises forming on a shrinkable substrate an image defined by a plurality of particles and having substantially less than an optimum optical density, and then forming a reduced-size image having a substantially improved optical density by shrinking said substrate with said image thereon.

The invention provides a method and apparatus for correcting shading distortion in a source of scanned video signal. A multiple location store is provided for storing a signal indicative of the shading correction required at each of a number of selected, spaced apart points in the scannable region of the source and signal interpolation means is provided for interpolating between the stores values of correction in both line and frame scan directions for other points in the region. The invention a...

An improved slide projector is provided for magnifying and projecting transparencies on a receiving surface. The projector is adjustably carried on a column which is mounted on a base. The column is pivotally connected to the base for rotating the projector for projecting a selected transparency on either a horizontal or vertical surface, as desired.

An image analysis system is described in which the video signal information is processed so that only the measurements on any one feature are delivered to the output during any one frame scan. In a modification, the function of the computing circuit performing the measurements on the signals arising from scanning the features is changed from frame scan to frame scan until a complete programme of different parameter measurements has been performed on the signals relating to one feature (one param...

An image-forming method, which comprises contacting at least one member selected from the group consisting of chlorite, chlorous acid, chlorine dioxide water, bromite and bromous acid with a photographic element comprising a support having provided thereon at least one layer containing image-wise distributed catalyst nuclei in the presence of a developing agent to thereby conduct image intensification.

A method and an apparatus for fixing an image formed by a colorant upon an image support body is described. A fluid, binder material contacts a heated transport surface. The heated surface comprises an elastomeric material which is positioned on a tubular body formed of a material having a relatively high coefficient of thermal conductivity. The transport surface advances the heated binder material to a nip formed with an adjacent pressure contact surface which is transported in moving engagemen...

An image sensor includes a plurality of parallel spaced apart semiconductor strips carried on an electrically insulating substrate and covered with at least one layer of light-permeable electrically insulating material. A plurality of parallel spaced apart electrically conductive strips are carried by the layer of light-permeable insulating material transversely of the semiconductor strips. Advantageously, the semiconductor strips may consist of epitaxial semiconductor strips, for example silico...

Combined copying and printing apparatus is provided by combining a known office copier of the plain paper transfer type with a non-impact printer that uses a black on white cathode ray tube optical display to form a latent electrostatic image on the photoreceptor of the copier apparatus. The cathode ray tube may be fixed or movable, as required, and is of the single sweep type using fiber optics to transmit the optical image to the photoreceptor, which photoreceptor moves relative to the CRT swe...