SU780224A1 - Phototelegraphy colour analyzing device - Google Patents

Description

(54) PHOTO TELEGRAPHIC COLOR ANALYZING DEVICE

The invention relates to phototeleographic technique and can be used in devices for analyzing still multi-color images. five

A phototelegraphic color anashisation device is known, containing successively arranged illuminator, first lens, sweep drum with a color ori-O signal, second lens, raster diaphragm, beam-splitting unit, three light filters and three photodetectors 1.

However, in the well-known photo-telegraph and nom color analyzing device, the signal-to-noise ratio is not high enough.

The purpose of the invention is to increase the signal-to-noise ratio.

To do this, an adder was inserted in one of the color channels of the known device, and one of the light filters was made non-color separating, the output of the photodetector located behind the non-color-separating light filter connected to the direct input syr / 1mator, and the outputs of the other two photodetectors connected to the inverse adder input, 3Q

The drawing shows a structural electrical circuit of the proposed device.

The phototelegraphic color analyzing device contains a scanning drum1 with color, original ,, first lens 2, illuminator 3, second lens 4, raster diaphragm 5, beam-splitting unit 6, three light filters 7, 8, 9, three photodetectors 10, 11, 12 and adder 13 .

The device works in the following way.

The luminous flux from the illuminator 3 is projected by the first lens 2 onto the color original, mounted on the unrolling drum 1. The luminous flux reflected from the color original is projected with the help of. the second lens 4 into the plane of the raster diaphragm 5, passing through which is split by the beam-splitting unit 6 into three streams. Two of these flows through the filters. 7. and 8 and third through non-separation light filter 9 are directed respectively to the inputs of photodetectors 10, 11, 12. Photodetectors convert color luminances into electrical signals

and amplify them to the same level C of the outputs of the photoreceivers 10, 11 color separated signals arrive at two outputs of the adder 13. The third input of this adder 13 through the photo receiver 12 receives the converted signal of the entire visible part of the spectrum, in the adder 13 the color separated signals are added together and subtracted from the signal of all visible parts of the spectrum. The ratio to the noise of the output signal is three times less than the same ratio to the noise of two color models. The signal from the entire visible part of the spectrum is not signal, because the noise is uncorrelated signals and add in the adder 13.

From the outputs of the photodetectors 10, 11, 12, and from the output of the adder 13, the color separated signals arrive at a further processing.

The proposed device allows an increase in the signal-to-noise ratio, at a given light flux in one of three color-separation signals, due to the introduction of a non-color-separation light filter 9, which passes the entire visible part of the spectrum.

Claims (1)

Invention Formula A phototelegraphic color analyzing device containing successively placed illuminator, first lens, sweep drum with color original, second lens, raster diaphragm, two-part dividing unit, three light filters and three photodetectors, different in order to increase signal / noise ratio one of the color Channels 6c, an adder was entered, and one of the light filters was made non-. at the same time, the output of the photodetector located behind a non-color separation filter is connected to the direct input of the adder, and the outputs of the other two photoreceivers are connected to the inverse input of the adder ..; . 20 Sources of information taken into account in the examination 1, Only B, B, Uzilevsky VA Color Phototelegraph, - Electron Communication, No. 11, 1973, p. (proto25 type).