SU746955A1 - Device for converting the signal level of black-and-white picture into the corresponding signal of coloured picture - Google Patents

Description

(54) DEVICE FOR TRANSFORMING THE LEVEL OF THE SIGNAL OF THE BLACK AND WHITE IMAGE INTO THE MATCHING SIGNAL OF THE COLOR IMAGE

I

The model is related to radio engineering industry and can be used in radio engineering installations displaying information.

A device for converting black-and-white images into color is known, which contains a threshold device that controls the keys, non-inverting and inverting amplifiers, constant displacement nodes. this component, the adder 1. In order to increase the resolution of the signal level, the converter with a linear peak, a linearly falling and combined amplitude characteristics, j diagrams provide more than seven color shades to the east view on the color strip, corresponding to different levels of the input signal. However, the OLA of the correct color coding of the input signal 20 device must only transfer the transmission of a constant composition of the signal, which complicates the circuit. Threshold and key schemes should have

small hysteresis and sufficient speed to convert fine details of the image, which also leads to the complication of the threshold and key schemes.

It is also known a device for converting a black-and-white signal into a discrete-action color image signal, comprising signal conversion channels consisting of signal level limiters and amplifiers 2j. Such a device has the error of -lia-aa diacretization, the presence of hysteresis and contains a large number of threshold schemes.

Claims (3)

The closest to the invention in technical essence and the achieved result is a device for transforming a black and white signal level into a color image signal consisting of seven threshold level schemes, each circuit consisting of a diode limiter and a trigger. Changing the signal ypiovn between two cocettnim threshold levels, such a scheme does not respond, and when the signal goes over the threshold level, there is a sudden change in the state of the scheme and change & combinations of three color signals, therefore input signal levels tia can be discretely coded with seven color combinations of three; BASIC colors. For three main colors, the device has two conditional levels h |. The disadvantage of this device is a large amount of equipment for sampling the signal. The aim of the invention is to simplify the device I for level conversion. A black and white image signal to a color image signal. The proposed goal is achieved by the fact that in the proposed device, in the first channel, a signal limiter is connected to the inverting input of the operational amplifier. the operational amplifier is connected to the bottom of the limiter, other inputs of the operational amplifiers are connected to the common input directly. The drawing shows the structural Hema described device. The device contains a three-channel analog converter with a common input. Each channel of the converter is formed by the series switching on of the limiter 1, 2 and 3 of the signal level and the operational amplifier 4, 5 and 6. In the first channel, output og is connected to the non-inverting input of the operational amplifier 4. The signal cutter is on top, and to the inverting input: an operational amplifier. 4 - output of the I limiter signal from the bottom. In the second channel to the inverting input: an operational amplifier 5 is connected to the output of the limiter 2 from the top. In the third channel, the output of the limiter 3 is connected to the inverting input of the operational amplifier 6 from below. Other inputs of operational amplifiers 5 and 6 are connected directly to the common input. The black-and-white signal is supplied to the terminators 1, 2, and 3 connected by galvanic to ai4 and fi ndially in optical amplifiers, 4, S, and 6 cooTBeTctseHHO. The output of each operadion amplifier 4, 5 controls the brightness of one of the three primary colors. The input signals, the level of which is below the limit level, are passed to both amplifier inputs in the red channel and are not traced. In the green channel, these signals pass only fta non-inverting: - input of the amplifier; and transmitted to the output without inversion; in the blue channel, signals are passed only to the Inverting input of the amplifier and transmitted to the output with inversion. The input signals, whose level is higher than the limiting level, in the red channel pass only to the non-inverting input of the accelerator, in the green channel these signals pass only to the inverting input of the amplifier. In the single color channel, these signals are passed to both inputs of the amplifier. Using a device to convert the level of a black-and-white image signal into a corresponding color image signal in information display settings, for example, on televisions' video monitoring devices, reduces the cost of developing and producing analog and discrete black-and-white converters to color. Apparatus of the Invention A device for converting a black-and-white image signal level into a COOT-I this color image signal containing a three-way analog converter with a common input, each channel of which contains a series-connected limiter and an operational amplifier, characterized in that, in order to simplify the device , in the first channel the signal limiter is connected to the non-inverting course of the operational amplifier from above, and the signal limiter is connected to the inverting input. At the bottom, in the second channel, to the inverting input of the operational amplifier, a limiter is connected at the top, in the third channel, to the non-inverting input of the op amp amplifier, a limiter is connected at the bottom, other inputs of the operational amplifiers are connected to the common input. Sources of information taken into account in the examination of l.The AmericaH jornaE of poentgenoCogy radium thefaru 2, 1958, p. 342-347. 2. Tsublvatsi Japan 44-11063, for the number 41-42477, CL. 97 (5) (NO4n). 3. Author's USSR Inscription M) 234606, cl. H 04 7/18, 1967 (prototype).