JPS628073B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high definition television imaging system that generates high definition color television image signals.

Conventionally, there has been no television imaging system that generates high-definition image information signals that has a good signal-to-noise ratio and little afterimage. Since there was nothing capable of generating high-definition image information, it was not possible to obtain a high-definition image information signal by imaging a fast-moving subject that requires little afterimage.

The object of the present invention is to eliminate such conventional drawbacks and
Good signal-to-noise ratio, low afterimage, and
To provide a high-definition television imaging system capable of obtaining a high-quality color television image signal with high definition and obtaining an image information signal of good image quality even when a fast-moving subject is imaged.

In other words, the imaging system of the present invention is different from the color television imaging system, which generates a color television image signal separated into a luminance signal and color signal, which has excellent afterimage characteristics but is inferior in definition, and the color television imaging system, which has excellent afterimage characteristics but is inferior in definition. An imaging means dedicated to extracting a two-dimensional contour signal that generates a high-definition monochrome image signal, and 2 that removes the influence of afterimage characteristics from the monochrome image signal.
a two-dimensional contour imaging system comprising two-dimensional high-pass filtering means for extracting a two-dimensional contour signal; Both are characterized in that they generate excellent luminance signals.

The invention will be explained in detail below by way of example embodiments with reference to the drawings.

First, FIG. 1 shows an example of the configuration of an imaging apparatus according to the method of the present invention. In the image pickup apparatus shown in FIG. 1, incident light from a subject forms optical images of the subject in two systems of image pickup tubes 2 and 3, respectively, through an optical system consisting of a lens and a half mirror. Of these two systems of image pickup tubes, image pickup tube 2 consists of three image pickup tubes corresponding to the three primary colors R, G, and B, respectively, as shown surrounded by dotted lines in the figure. It is sufficient that the afterimage characteristics are as good as in the color television broadcasting camera described above, and that the definition is on the same level as in the conventional ordinary broadcasting television camera. on the other hand,
The image pickup tube 3 has much better definition than the image pickup tube 2, and has particularly good noise characteristics in the high frequency range, and has better afterimage characteristics than the image pickup tube 2.
It is sufficient that the condition is not very good. Furthermore, both of these image pickup tubes 2 and 3 meet the standard television scanning standard or the scanning standard for high-definition television, for example, 1,300 lines or 1,500 lines, which is much higher than the conventional scanning standard. It is assumed that scanning is performed in accordance with a scanning standard such as a large number of scanning lines, 30 images per second, and an interlace ratio of 1:2, so that a high-quality television image signal can be obtained as an imaging output signal.

In the two-system imaging system having such a configuration, the imaging output three primary color signals of the imaging tube 2 are converted to a luminance signal (Y) conversion circuit 5 and a color signal (C) similar to those in a color coder in a normal color television imaging device.
The luminance signals Y and 2 are transmitted through conversion circuits 6 and 2, respectively.
For example, convert to color difference signal C, and convert them to Y/C
Both signals are taken out via a delay circuit 7 for compensating for timing deviations between each other and between the imaging output signal from the other imaging tube 3.

On the other hand, the high-definition image pickup output monochromatic signal from the image pickup tube 3 is supplied to a two-dimensional filter 4 which operates as will be described in detail later, and the band characteristics of the high-pass filter (HPF) in the two-dimensional spatial frequency domain are measured. grant,
Extract the high-frequency image signal representing the contour information of the image,
The contour information signal of the extracted output is led to the adder 8 and combined with the luminance signal Y in the other imaging system from the delay circuit 7, and the high-definition luminance signal of the addition output and the two types of color difference from the delay circuit 7 are combined. The signal C is supplied to a color signal conversion circuit 9 having a function similar to that of a normal color coder to generate a high-definition, high-definition color television image signal having a signal form similar to a normal composite color television signal. Form.

For example, in the imaging device of the present invention having the circuit configuration as described above, the color image information signal from the image pickup tube 2 is used for the low frequency component in the spatial frequency domain of the obtained high-quality color image signal, and the spatial frequency The contour information signal from the image pickup tube 3 is used for the high-frequency component of the area, and the image deterioration component based on the afterimage contained in the image pickup output signal of the image pickup tube 3 is removed by the two-dimensional filter 4. The above-mentioned color signal conversion circuit 9 obtains high-definition color television image signals having extremely good quality for both still images and moving images.

In the circuit configuration shown in FIG. 1 described above, an example of the circuit configuration of the two-dimensional high-pass filter 4 for forming a contour information signal from which deterioration components due to afterimages have been removed is shown in FIG. is shown in Figure 2b.

In the circuit configuration shown in FIG. 2a, the image signal whose signal waveform shown in FIG. 2b from the input terminal is
It leads directly to the subtractor 13, and also leads to the subtracters 13 and 14 via the 1-line delay circuit 11 whose output signal waveform is shown in FIG. 2b. Line delay circuit 1
From the subtracter 13, a difference signal of (1 line delayed signal) - (original signal) having a waveform shown in FIG.
4, a difference signal of (1-line delayed signal) - (2-line delayed signal) having a waveform shown in FIG. 2b is extracted. These difference signals are then led to an adder 15 and combined to produce an image information signal representing the vertical contour of the input image signal representing, for example, a rectangular figure, as shown in FIG. 2b. , forming a contour information signal having a high-pass filtered waveform in the vertical spatial frequency domain.

Then, for example, the one-line delay circuit 11 mentioned above
As an input signal, the 1-line delayed image signal from
The circuit configuration is exactly the same as the circuit configuration for forming the vertical contour information signal described above, and the horizontal A directional contour information signal, ie, an image signal having a waveform passed through a high-pass filter in the horizontal spatial frequency domain, is formed. The process of forming the contour information signal in the horizontal direction is exactly the same as the process of forming the contour information signal in the vertical direction described above, as shown in FIG. 2b.

If the horizontal and vertical contour information signals formed as described above are taken out via the adder 21 and the level adjuster 22, the horizontal and vertical spatial frequency regions of the image signal, that is, the two-dimensional high-pass filter When a high-definition image signal output from the image pickup tube 3 with deteriorated afterimage characteristics is added to the two-dimensional high-pass filter 4 having such a configuration, the tail is caused by the afterimage. A high-definition two-dimensional contour information signal from which subtractive signal components are removed is obtained.

Note that the delay circuit 7 in the circuit configuration shown in the first figure
specifically compensates for the delay of the image signal in the process of forming the two-dimensional contour information signal mentioned above,
The main purpose of this is to eliminate the timing deviation between the color image signal and the color image signal by the image pickup tube 2 which is synthesized in the adder 8.

In addition, when forming the contour information signal from the imaging output signal of the image pickup tube 3 in the configuration shown in FIG. A pass filter, for example, a one-frame delay device, is used to form an image signal delayed by one frame period, and a desired contour information signal is extracted with better quality as the difference between the one-frame delayed signal and the original signal. It can also be done. If the contour information signal formed in this way is added to the luminance signal in a color imaging system, which has good afterimage characteristics but is not so good in terms of definition, as described above, it can also be used for moving images. It is possible to simultaneously remove image blurring such as trailing and afterimages that occur in moving images based on the accumulation effect of signal charges caused by the incident light image on the image pickup tube. A high-definition color television signal with high definition can be obtained.

In the above explanation, the three primary color signals obtained from the image pickup tube 2 are converted into a luminance signal and a color difference signal similar to those in a so-called composite color television signal. I tried to add the signals, but the image pickup tube 3
The addition of the high-definition monochromatic signal from the source is not limited to such cases, but it is also possible to add the green signal that approximates the luminance signal component in the color image signal as the three primary color signals, and other imaging output monochromatic image signals with low afterimage. You can also.

As is clear from the above description, the present invention provides a color television imaging system that does not have sufficient resolution but has excellent afterimage characteristics, and a single color television imaging system that has insufficient afterimage characteristics but has sufficiently high definition. In combination with a high-definition imaging system equipped with an image pickup tube, the high-definition image signal obtained from the latter imaging system is used to form a contour information signal, and the former imaging system is used to capture images of fast-moving subjects. However, it is possible to obtain an image information signal that follows the movement of the subject without any deterioration in image quality, and to obtain a high-quality color image signal with high definition and low afterimage that mutually compensates for the inherent shortcomings of both imaging systems. This makes it possible not only to improve the quality of conventional standard television image signals, but also to realize high-standard, high-definition color television imaging systems with an increased number of fields or scanning lines. Remarkable effects can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a configuration example of a high-quality imaging device according to the method of the present invention, and FIGS. 2a and 2b are block diagrams showing a configuration example of a two-dimensional filter and signal waveforms of each part thereof in the same configuration example. and a waveform diagram. 1... Optical system, 2, 3... Image pickup tube, 4... Two-dimensional filter, 5... Luminance signal conversion circuit, 6... Color signal conversion circuit, 7... Delay circuit, 8... Adder,
9...Color signal conversion circuit, 11...1 line delay circuit, 12...2 line delay circuit, 13,1
4, 18, 19...subtractor, 15, 20, 21...
...Adder, 16, 17...1 pixel delay circuit, 22
...Level adjuster.

Claims (1)

[Claims] 1. A color television imaging system that generates a color television image signal with excellent afterimage characteristics but inferior definition into a luminance signal and a color signal, and a monochromatic image with high definition but with poor afterimage characteristics. a two-dimensional contour imaging system consisting of an imaging means dedicated to extracting a two-dimensional contour signal for generating a signal, and a two-dimensional high-pass filtering means for extracting a two-dimensional contour signal from which the influence of afterimage characteristics has been removed from the monochromatic image signal; A high-definition television imaging system, characterized in that the two-dimensional contour signal is added to the brightness signal in the color television image signal to generate a brightness signal with excellent afterimage characteristics and definition.