SU1732496A1 - Color tv camera - Google Patents

Abstract

This invention relates to a communications technique. The purpose of the invention is to increase the resolution and improve color reproduction. The color television camera contains a lens 1. raster color-coding light filter 2, a CCD 3 matrix, amplifier 4, switches 5 and 10. adder 6. matrixing unit 7, synchronizing generator 8. sample recovery unit 9, R and B samples 11 and 12, blocks 13 and 14 of the sampling cells R, B and Y, a low-pass filter 15 and a high-pass filter 16. The image of the transmitted object is projected by lens 1 onto the photosensitive surface of the CCD 3 matrix. A light filter 2 is superimposed on the surface, in the black lines of which there are only transparent cells that pass the entire spectrum of visible radiation without change. In order to increase the resolution of the camera in odd lines of the light filter, 2 colored cells are moved with transparent ones in such a way that any colored cell is surrounded by transparent cells on all sides. In this case, the camera restores the luminance information about the missing luminance element covered by a color cell. 2 Il. E sh to: h: o

Description

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The invention relates to the communications industry and can be used in the construction of color television cameras.

The purpose of the invention is to increase the resolution and improve color reproduction.

FIG. 1 shows a structural electrical circuit of a color television camera; in fig. 2 shows the structure of a raster color-coding color filter and diagrams explaining camera operation.

The CCD color television camera contains a lens 1, a raster color-coding light filter 2, a CCD matrix 3, an amplifier 4, the first switch 5, an adder b, a matrix 7 unit, a synchro generator 8, a sample recovery unit 9, a second switch 10 - R storage, sampling-storage unit B, 12, sampling unit R and B, 13 sampling unit Y, low-pass filter 15 (LPF) and high-pass filter 16 (HPF)

A color television camera operates as follows.

The image of the transmitted object is projected by the lens onto the photosensitive surface of the CCD 3 matrix. A raster color-diverting light filter is superimposed on the surface. In the black lines of this raster color-coding light filter 2 there are only transparent cells that pass the entire spectrum of visible radiation without change.

In order to increase the resolution of the camera in odd lines of the light filter, 2 colored cells are moved with transparent ones so that any colored cell is surrounded by transparent cells on all sides (Fig. 2a). The red (k) elementary cells of the raster color-coding light filter transmit only the red component of the visible spectrum to the light-sensitive elements of the CCD 3 matrix located behind them. During reading from the output register of the CCD 3 matrix of each (4p + 1) -th row, signals from the elements located behind the red cells appear at the time points shown in FIG. 2d, and during the reading of each (2n + 1) st line - at times, also shown in FIG. 2d

FIG. 2e and f are the moments according to the signal distribution behind the blue cells.

The signal of the CCD 3 matrix after amplification in the amplifier 4 is fed to the reference recovery unit 9, in which (FIG. 3 a) using six delay lines per time

one gi element of two delay lines at time line H simultaneously receives information from the eight elements of the CCD 3 surrounding, for example, element 5 (Fig. 36). This information with a coefficient, for example, k-, in each channel

It is in block 7 of matrixing to obtain information for element 5 with the highest accuracy of reconstruction on the surrounding elements. This signal is obtained for any current image element. Therefore, it is then fed to the signal input of the second switch 10, to the synchronization input of which a square wave with frequency fCTp / 2 is fed. At the output of the switch 10, the current signal in the form of the sum of eight surrounding elements is as follows (as it is necessary) only in odd lines. To exclude the known luminance samples, which already have information, the signal from the output of the second switch 10 is fed to the signal input of the cell sampling unit R and B 13, to the synchronization input of which the pulses of FIG. 2 and from sync generator 8 for sampling the signals of the color elements.

The reconstructed luminance information about the missing luminance element, closed by a colored cell, is fed to the input of the adder 6, to another input of which the signal of even (transparent) lines is fed from the first switch 5, to the signal input of which the amplified signal of the CCD 3 is fed. using the horizontal frequency meander fCTp. filed at its synchronization input, the signals of even and odd lines are separated and fed to different outputs. The signal of even (transparent) lines is immediately fed to the second input of adder 6, and from the signal of odd lines, information on color sections is first excluded from block 14, sampling of Y cells using pulsed samples of the capacitive elements, then this information is fed to the third input of adder 6 At the output of the adder 6, a luminance signal is formed with a very greater degree of accuracy, corresponding to the high-definition signal of a black and white camera on the CCD 3 matrix without a raster color-coding light filter 2, which provides emitting the highest possible resolution of a color camera on a CCD array; Using a filter 15 (LPF), a narrowband low frequency (0.5 MHz band) is extracted from this signal (Fig. 3 Sv), a further Yc signal in the block of matrixing the low-frequency signal of the green color separation of the GL-image, for which the presence of the signals of the red and blue colored separations of the RL and BL, respectively, is necessary. These signals are received in blocks 12 and 13 of the sample-storage, the signal inputs of which are given a signal of odd lines, and the synchronization inputs are signals from a synchronous generator 8, coinciding in time with the signals of FIG. 2d in each (4n + 1) th line and in fig. 2d in each (2p + 1) -th row for block 11 and respectively in FIG. 2e and dl block 12.

Filter 16 (HPF) extracts the YH signal (Fig. 3 Sv), which is a mixed high frequency that is added to the low-frequency signals RL, BL, GL in block 7 to form the output signals of the ER, EG and EV camera according to the method of mixed high frequencies.

The use of the proposed camera makes it possible to simplify and improve the quality of transmission of images of teleconferencing participants and demonstration materials, diagrams, drawings, etc. At the same time, the clarity of the reproduced image of the listed objects increases.

Claims (1)

The invention The color television camera containing a lens optically connected through a raster color-coding light filter, the even lines of which are made of transparent cells, with a charge-coupled device (CCD) matrix, the output of which is connected through an amplifier to the information input of the first switch, the first output of which is connected to the first input of the adder, the output of which is connected to the input of the low-pass filter, the output of which is connected to the first input of the matrixing unit, the synchronous generator, the output of which is connected to the control inputs of the CCD and the first switch, is characterized in that, in order to increase the resolution and improve color reproduction, the second switch, unit sample recovery (BVS), R and B sample-and-hold blocks (BVH), R, B, and Y sample blocks, a high-pass filter whose output is connected to the second input of the matrix unit, and the high-pass filter is connected to the adder stroke, the second input of the adder is connected to the output of the cell sampling unit Y, whose input is connected to the second output of the first switch, to the input of the storage sampling unit R, to the input of the sampling-storage unit B, the output of which is connected to the third input of the matrix unit, the fourth input connected to the output of the sampling-storage unit R, while the amplifier output is connected to the input of the sample recovery unit, the output of which is connected to the first input of the second switch, the output of which is connected to the input of the sampling unit R and B, the output which is connected to the third input of the adder, while the synchronization inputs of the second switch, cell sampling blocks Y, R and B of the sampling and storage blocks R and B are connected to the output of the synchro generator, and the raster color-coding optical filter is designed so that 4p + 1 lines contain alternating sequences V R; Y.B; Y, R a 2n + 3 lines contain alternating sequences Y, B; Y, R; Y, B; Y, R, ... and so on. Strings one 2 3 P - 5 Read Time single item (Cp + 1) p. (2p + 3) p. () P. (2ti + 3) crp l eight # / g, 2