An image monochromator is arranged to receive light at an input thereof simultaneously from an entire object field to be viewed and to produce and transmit a viewable image of the entire object field simultaneously through an output thereof at a selected wavelength band. The monochromator has inner and outer optical systems, the inner system comprising an input slit which is projected on an output slit through imaging means such as lenses or mirrors, via dispersive means such as a diffraction gr...

A method and apparatus for modifying an image represented by digital data defining the content of one or more pluralities of cells constituting one or more color separations is described. The digital data indicates for each cell whether the respective color is "present" or "absent". The apparatus comprises scanning means (15,16) for electronically scanning along a plurality of scan lines with a mask of preselected dimensions; the respective plurality of digital data corresponding to a region inc...

In a sandwich type image sensor having a photoelectric converting portion comprising a photoelectric conductive layer interposed between an upper electrode and a lower electrode, a light-shielding means is provided for selectively covering an end portion of the photoelectric conductive layer so as to be excluded from a light-receiving area of the converting portion. Alternatively, an insulating layer partly blocking the contact between the photoelectric conductive layer and the lower electrode i...

An image sensor comprises a transparent substrate, an optical lens formed integrally in one major surface of the transparent substrate, and a photosensor provided on the side of the other major surface of the transparent substrate and having output electrodes, wherein light incident on the optical lens is focussed by the lens onto the photosensor through the transparent substrate.

An image reader for reading images on a surface of a medium, having a feeding device for feeding the medium, carriage movable in a direction perpendicular to the direction of feed of the medium, a driving device for moving the carriage, and a reading head mounted on the carriage for reading the images on the medium surface. The image reader comprises an area setter for setting a reading area on the medium surface within which the images are read by the reading head. The reading area is set while...

In this invention there is disclosed a color image reader being able to read in three modes, a black and white mode, a color mode and a dropped color mode. The reader includes three fluorescence lamps for illuminating a document to be read, each lamp having their own peaks in red, green and blue light zones respectively, an optical system for obtaining a real image of the document therethrough, a single image sensor being arranged at the position where the real image is focused, a mode selection...

A CCD frame transfer image sensor wherein the effective integration period can be shortened by electrical means. The sensor comprises an image section having a first photo-sensitive portion of an array of CCD channels and a store section having a second light shielded portion of the array. Means are provided for controlling the potentials applied to the control electrodes of the array so as to transfer along the channels charge generated in the image section into a charge sink structure during o...

The invention relates to improvements in an image guide using optical silica glass fibers. The improved image guide has a light shielding and light absorbing thin layer formed on the periphery of an optical fiber bundle consisting of a multiplicity of optical fibers to prevent incidence of external light from the peripheral surface of the bundle and to absorb and remove any scattered light as it is transmitted to parts other than the core of each optical fiber, thereby providing improved picture...

An image reader comprises a readout device for storing charges in a predetermined period to read an image of an original sheet and outputting the stored charges in a following period, an image signal processing device for processing the output image signal of the readout device, and disabling device for disabling the image signal processing device for an image signal output period immediately following a read request signal to the readout device.

Image enhancement accomplished by filtering using filters optimally adjusted to system parameters to enhance long edges, attenuate noise and "points" so that the long-edge data normally buried in noise is available and to further enable using low-frequency data.