SU1472764A1 - Device for output of colour images - Google Patents

Abstract

The invention relates to the field of photogrammetric instrument making, in particular, to optoelectronic devices for processing color images. The aim of the invention is to improve the accuracy of color image output by reducing the effect of errors due to the decomposition of color into components and their subsequent reduction. The device contains three digital-to-analog converters 2 ¹ , 2 ^П , 2 ^Ш whose inputs are connected to a computer information storage unit, the output of the first digital-analog converter 2 ^{1 is} connected to the control input of a variable-wavelength laser 3, the output of the second digital-analog converter 2 ^{П is} connected to one input of an electronic comparator 4, the third output DAC 2 ^W is connected to the second input of the electronic comparator 4 and a control input of an optical filter made with a variable coefficient -prop filigree 5

on the optical axis of the laser, there is an optical filter 5, an optical addition unit consisting of a prism cube 6 and a lens 7, a raster diaphragm 8, a focusing lens 9 and a color photographic material mounted on the drum 10

the output of the electronic comparator is connected to a light modulator 12 connected to the lens 11 and the optical addition unit. 1 il.

Description

The invention relates to photograms. metric instrument, in particular to optical-electronic devices for image processing,

The aim of the invention is to improve the accuracy of color image output by reducing the effect of errors due to the decomposition of color into components and their subsequent addition.

The drawing shows the block diagram of the device.

Features of computer 1, on which codes are formed that correspond to color tone and purity. colors and luminance of the displayed image, through dafro-analogue converters 2, 2, 2, are connected respectively: 2- to the control input of the laser 3 with the reference wavelength of the radiation — to one of the inputs of the electronic comparator 4; - with the second input of the electronic comparator 4 and the input of the optical filter with a variable transmittance 5, and on the optical axis of the laser 3 with a variable wavelength of radiation there is an optical filter 5 with a variable transmittance, prism-cube 6, lens 7, raster aperture 8 , a focusing lens 9 and a color photographic material 10, mounted on a drum, moreover: OUTPUT.1 of the electronic comparator 4 is connected to a light modulator 11 connected. with lens 12 and prism-cube 6.

The output device color photographic images from the computer works as follows.

In computer memory 1, a three-dimensional numeric array is formed, each element of which corresponds to one element of the displayed image and contains data about color tone, purity of color and brightness, produces element-by-element output of a numerical array, while data on color tone, purity of color and brightness simultaneously arrive to the inputs of digital-to-analog converters 2% 2, where the corresponding codes are converted to analog signals. An analog signal (color tone) is fed to the control input of laser 3 with a controlled wavelength of radiation, which generates a light flux with a wavelength corresponding to a given color tone.

the signal (luminance) is fed to one of the control inputs of the electronic comparator 4 and the control input of the optical filter 5 with a controlled transmittance that changes the k-gain to the corresponding brightness, and the analog signal (color purity) goes to the second input of an electronic comparator 4, where, based on signals by known ratios, a control signal is generated to control the white light optical modulator 11, the light output of which is a function of the purity signals t she and brightness.

The luminous flux generated by the controlled-wavelength laser 3c passes through the optical filter 5 with a controlled transmittance and enters one of the faces of the prism cube 6, to the second face of which the luminous flux emitted by the optical modulator 11 of the white light and formed lens 12.

Thus, by adding two color streams, at the output of the semitransparent cube 6, a luminous flux is formed with the specified values of color purity and color tone, which is focused by means of lens 7 in the plane of raster diaphragm 8.

The luminous flux passing through the raster aperture 8 is focused by the lens 9 onto the surface of the photographic material 10, which is fixed on the drum of the drum scanning device. Thus, the view of each element of the image from the computer to the photo carrier is produced. Y, the drum-type scanner device allows for rotational and incremental movement of the photocarrier relative to the image of the raster diaphragm and thereby to obtain a sequential image of all image elements.

Claims (1)

Invention Formula A color image output device comprising first, second and third digital-to-analog converters associated with an information storage unit, an optical modulator. filter, optical folding unit and 3147276D located on the same optical axis, raster diaphragrastral diaphragm, focusing op-m and focusing optical system, tic system and color photo-and electronic comparator output A rial, mounted on a 1Bane bar, from which is connected to the modulator, is somatic that, one hundred, connected to the optical unit the purpose of increasing the accuracy is by counting, with the first digital-analog reduction of the error, the conditioned transducer is connected to the color decomposition controlled by the laser input, the second and third addition, and their subsequent addition, it has 10-digit anapole transducers equipped with a variable-length laser with single inputs; radiation waves, on the optical axis of the electronic comparator, and the third the optical digital-to-analog converter, a soyfilter, which is implemented with a variable input with a control input — is the optical transmittance coefficient, an optical filter block.