JPH02104195A - Interference removing device for stereoscopic camera - Google Patents

Abstract

PURPOSE:To reduce interference with a left image or between right and left image and to improve stereoscopic sense by processing one image information signal preceding by one field time and then adding the processed signal to the succeeding other image information signal. CONSTITUTION:An image information signal is inputted to an input terminal Vin, and after low pass processing the input signal, the signal is delayed by one field through a field delay 2, and the phase of the delayed signal is matched with that of an image information signal inputted to the next field. At the time of inputting a left side image information signal to the input terminal Vin in the case of interlacing signals at the rate of 4:2 in a subtracting circuit 5, a right side image information signal inputted before one field is level- converted by alpha through a level converter 3, subtracted from the left side image information signal to reduce crosstalk due to the right side image information signal. At the time of inputting the right side image information signal to the input terminal Vin, the left side image information inputted before one field is not subtracted. Thus, the stereoscopic sense can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an interference removal device for a stereoscopic television camera, and particularly to image information signal processing for a stereoscopic television camera using a time-division imaging system.

[Summary of the Invention] The present invention solves interference (crosstalk) in the right image or between the right image and the left image, which occurs due to the combination of the image pickup tube's afterimage characteristics and the interlaced format, in a time-division imaging stereoscopic television camera. Discloses a technology that reduces crosstalk between the left image, or the right image and the left image, and enhances the three-dimensional effect by processing one image information signal that precedes one field time and adds it to the other image information signal that follows. It is something to do.

Note that this summary is provided solely for the purpose of quickly accessing the technical content of the present invention, and does not have any influence on the technical scope of the present invention or the interpretation of rights.

[Prior Art] As the three-dimensional television camera system for capturing three-dimensional images, which is the background of the present invention, there is a system in which two imaging cameras are placed side by side on the left and right in space for left and right images, and an optical system as shown in FIG. There is a method that has left and right optical paths, and uses an image pickup tube in time division for the left and right images, but the former method does not cause interference (crosstalk) between the left and right images, but is economical because it uses two imaging cameras. On the other hand, the latter method uses only one image pickup tube.
Although it is economical because only one set is used, it has the disadvantage that crosstalk between the left and right images occurs due to the afterimage characteristics of the image pickup tube, resulting in deterioration of image quality.

[Problems to be Solved by the Invention] In a three-dimensional television camera in which only the optical system shown in FIG. The reason why talk occurs and image quality deteriorates will be explained below.

Figure 5 shows the time of this camera, the arrangement of vertical scanning lines,
In other words, it shows the state of interlacing, as shown in the same figure (
a) and (b) show 4:2 interlace and 4:1 interlace conditions, respectively. In the figure, points * and x indicate scanning lines for scanning image information signals on the left and right sides, respectively. These scans complete one cycle in four fields, and If, 2f, 3f, and 4f indicate each field. FIG. 5(C) shows the ON/OFF control status of the optical shutters provided in the left optical path and the right optical path in FIG. 4.

FIG. 6 shows a situation in which the right side image and the left side image are outputted alternately in time by the scanning shown in FIG. In addition,
In a three-dimensional television camera, one field time must be approximately 1/120 seconds, which is twice the speed of current televisions, taking into account flicker that may occur on the display.

FIG. 7 is an example of a left-hand image and a right-hand image obtained by the scanning of FIG. 5.

FIG. 8 shows the relationship between the scanning line interval and the beam thickness of the scanning line. In an actual scanning line, the shape of the beam is considered to be a Gaussian distribution type, as shown in FIG. 5(a), but it is considered as an equivalent scanning line approximated by a rectangle as shown in FIG. In this case, the equivalent scanning line beam width Ilb is the scanning line interval °C
becomes narrower than

In an image pickup tube using an electron beam, charges accumulated in each field are read out by the beam, but when the scanning method shown in Figure 5 is adopted, some of the charges are read out in each field as shown in Figure 9. There may be cases where you are left behind. That is, although FIGS. 9(a) and 9(b) show the states of 4:2 interlace and 4:1 interlace, respectively, in the case of 4:2 interlace shown in FIG. 9(a), the second field 2f and the fourth field Since the scanning line of 4f is at the same position as the scanning line of the first field lf and the third field 3f, for example, the scanning line of 2f is 1
Whereas only the charge accumulated in part A corresponding to the field time is read out and the charge in B is not read out,
The scanning lines of the first field lf and the third field 3f are:
For example, in a 3f scanning line, in addition to the original accumulated part C, the charge of two fields and one field before and E
is also read. As a result, as shown in FIG. 1.theta.(a), in addition to the left-hand image shown by the solid line, the right-hand image shown by the dotted line is also generated in the output of the third field 3f.

This is the same in the case of the 4:1 interlace shown in Figure 9(b), and from the relationship between the original charge ■ shown in the figure and the charge Q that causes crosstalk, Figure 10(b) ), both the right and left images cause crosstalk with each other, and both of these are causes of image quality deterioration in stereoscopic images.

Therefore, the object of the present invention is to solve the problem of insufficient separation of left and right images, that is, crosstalk, due to the afterimage characteristics of the image pickup tube in a stereoscopic television camera that extracts right and left images from the same image pickup tube in a time-division manner, by converting it into an interlaced format. It is an object of the present invention to provide a device for eliminating interference in a stereoscopic camera, which reduces interference and enhances the stereoscopic effect.

[Means for Solving the Problems] In order to achieve such an object, the present invention provides a stereoscopic television camera that uses an image pickup tube in time division for left and right images to obtain a stereoscopic image. A delay means for giving a delay of one field time to an image information signal read out one field before the image information signal of the current field, and an image information of one field before passing through the delay means are predetermined for No. 3. It is characterized by comprising a level conversion means for performing level conversion, and means for adding the output from the level conversion means to the image information signal of the current field via a changeover switch whose opening and closing are controlled by the interlace format of the stereoscopic camera. do.

Another aspect of the present invention is characterized in that it includes means for mixing an image signal read out one field before with an image information signal of the current field via a delay means, a level conversion means, and a changeover switch. .

Furthermore, another embodiment is characterized by comprising means for detecting the motion vector of the image from the image information signal of the current field read out from the image pickup tube, and means for performing motion correction processing on the output of the level conversion recording means. do.

Furthermore, another embodiment is characterized in that a filter means for manually inputting the image information signal read out one field before is arranged before the delay means.

[Function] According to the present invention, in a stereoscopic television camera that obtains a stereoscopic image by using an image pickup tube in time division for the left and right images, insufficient separation of the left and right images due to the afterimage characteristics of the image pickup tube, that is, crosstalk is prevented. , 1 for 4:2 interlace
The crosstalk of the right image information signal can be reduced by subtracting the left image information signal at an appropriate level using the image information signal before the field, and in the case of 4:1 interlacing, the right image information one field before each Mutual crosstalk caused by the right or left image signals can be reduced by alternately subtracting the left or right image information signals of the current field at appropriate levels using the information signal or the left image information signal.

That is, the configuration of the present invention makes it possible to eliminate crosstalk between the left and right images due to the afterimage characteristics of the image pickup tube in either 4:2 interlaced or 4:1 interlaced format, thereby economically achieving high image quality. Therefore, it is possible to provide a 3D television camera that aims to enhance the 3D effect and the 3D effect.

Embodiments Next, embodiments of the present invention will be described with reference to the drawings.

A first embodiment of the present invention is shown in FIG. In FIG. 1, 1 is a vertical low-pass filter (VFILT),
2 is a field delay (f-DL) that provides a delay of one field time; 3 is a field delay (f-DL) that provides a delay of one field time; and 3 is, for example, 4 shown in FIG. 9(a):
In the case of 2 interlaces, the original charge accumulation part C
and the area ratio E of the residual portion E one field before.
A level conversion circuit that converts the level of an image information signal into which only a coefficient α approximately corresponding to :2 As in the case of interlacing, the coefficient is set to correspond to the ratio Q/I of the respective areas of I and Q. 4 is a changeover switch in Figures 9(a) and 10.
In the case of 4:2 interlacing shown in FIG. 3(a), it is closed only when the left image information signal is input to the input terminal Vln, and in the case of 4:1 interlacing, it is controlled to be closed all the time. 5 is a subtraction circuit.

In the device having the configuration shown in FIG.
An image information signal read out field by field by a beam using an image pickup tube as shown in FIG. 6 is input to the image pickup tube.
Low pass with vertical low pass filter 1! After being input to the AI field, it is delayed by one field time using field delay 2, and is read out at the next field time and sent to the input terminal V.
The phase is matched with the image information signal input to ln. Next, the coefficient α is level-converted by the level conversion circuit 3 and is applied to the input of the subtraction circuit 5 via the switch Sl.

That is, in the subtraction circuit 5, in the case of 4:2 interlace, when the left image information signal is inputted to the input terminal Vln, ! The right side image information signal inputted manually before the field is converted to α only and is subtracted from the left side image information signal by closing the switch S1, thereby reducing the crosstalk caused by the right side image information signal. The right side image information signal is input to the input terminal V1,
When the left side image information signal is input manually one field before, the switch Sl is open, so the above-mentioned subtraction is not performed.

In the case of 4:1 interlacing, the switch S1 is always closed, so that for the left image information signal or the right image information signal inputted to the input terminal Vln, the right image information signal or the left image information signal inputted before the field is is level-converted and subtracted by a coefficient α to reduce crosstalk.

A second embodiment of the present invention is shown in FIG. 2. This example is the first
The operation of the first embodiment shown in the figure is realized by a configuration using a feedback loop.

That is, in FIG. 2, 1 is a vertical low-pass filter, 2 is a field delay that provides a delay of one field time, and 3 is a level converter for the image information signal manually input by the coefficient α described in the first embodiment. level conversion circuit,
4 is a changeover switch S1.5 whose switching is similarly controlled according to the interlaced format, which inputs the manually input image information signal of the current field through the vertical low-pass filter 1, field delay 2, level conversion circuit 3, and switch sl. This is a subtraction circuit that manually inputs the image information signal of the previous field that is fed back.

The operation and functions of this embodiment are clear from the description of the first embodiment, and will therefore be omitted.

Example 3 A third embodiment of the invention is shown in FIG.

In this embodiment, when there is movement in the image, a slight positional shift occurs between the right image and the left image, so in the first embodiment shown in FIG. 1, the input terminal Vl. A motion vector is detected by branching the image information signal input to the input signal, and inputting it manually to a motion vector detection circuit 6, and correction is performed by adding the output to a motion correction circuit 7 provided after the level conversion circuit 3. It is.

In the first to third embodiments described above, the vertical low-pass filter 1 is provided before the field delay 2, but this filter is not required for normal image quality requirements. It is also possible to have a configuration in which this is removed.

Furthermore, the above description of the first to third embodiments is based on 4:2 interlace and 4:1 interlace formats.
Although only two interlaced cases were described, the present invention is of course not limited to such cases.

[Effects of the Invention] As is clear from the above, according to the present invention, in a stereoscopic television camera of a type in which a right image and a left image are taken out in a time-sharing manner using the same image pickup tube, the difference between the left and right image tubes due to the afterimage characteristic of the image pickup tube is reduced. Since crosstalk can be effectively removed in accordance with the interlaced format, it is possible to economically improve the image quality and enhance the three-dimensional effect.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a first embodiment of the invention, FIG. 2 is a block diagram showing a second embodiment of the invention, and FIG. 3 is a block diagram showing a third embodiment of the invention. , Fig. 4 is a configuration diagram showing the optical system of the time-division 3D camera, Fig. 5 is an explanatory diagram of the scanning line structure of the time-division 3D camera and the operation of the optical shutter, and Fig. 6 is the output signal waveform of the time-division 3D camera. Figure 7 is a diagram of left and right side images of a stereoscopic image, Figure 8 is an explanatory diagram of the scanning line spacing and beam thickness, Figure 9 is an explanatory diagram of the scanning line structure and the state of accumulated charges, and Figure 10 is is an explanatory diagram of crosstalk of a time-division stereoscopic camera. DESCRIPTION OF SYMBOLS 1... Vertical low-pass filter, 2... Field delay, 3... Level conversion circuit, 4... Switch, 5... Subtraction circuit, 6... Motion vector detection circuit, 7...・Motion correction circuit. Patent applicant: Japan-Thursday Broadcasting Association agent
Patent Attorney Tani Yoshi - 1 Insushi zhangfang haiku low tv nuho ruta figure 1 or 46a A Xiu 20 mostly 1 example block area fig. 2 fig. θ Dairyu Ei F'u /) Block diagram Figure 3 Sometimes 111 style camera's light speaking system number is shown in the talent formation diagram Figure 4 Fighting is the IJ sentence Kasura's water Kai actual number liquid fallen diagram No. 6 Figure t i' 8J tf) ri Ei ko IJ Fuu J small ゛
Rareikai IJJ, Image (Sae) Figure 7 Wind de Chikyu Threshold and Hime 0 Pepe 0 Sumiaki Figure 8 If 2f 3f 4f Ifff
2f 3f 4f(b) The rotation of the ``mawari-shokushishu'': *t ff The electric charge in the 0 state and the 1 state (Fig. 9 R-1) Crosstalk θ Figure 10

Claims (1)

[Scope of Claims] 1) In a stereoscopic television camera that obtains stereoscopic images by using an image pickup tube in time division for left and right images, the image information signal of the current field is read out one field before the image information signal of the current field read out from the image pickup tube. a delay means for applying a delay of one field time to the image information signal obtained by the delay means; a level conversion means for performing a predetermined level conversion on the image information signal one field before passing through the delay means; and from the level conversion means. 2. An interference removal device for a three-dimensional camera, comprising means for adding the output of the three-dimensional camera to the image information signal of the current field via a changeover switch whose opening and closing are controlled according to the interlace format of the three-dimensional camera. 2) It is characterized by comprising means for mixing the image signal read out one field before with the image information signal of the current field via the delay means, the level conversion means, and the changeover switch. The interference removal device for a stereoscopic camera according to claim 1. 3) A claim characterized by comprising means for detecting a motion vector of an image from the image information signal of the current field read out from the image pickup tube, and means for performing motion correction processing on the output of the level conversion recording means. Item 1. Interference removal device for a stereoscopic camera according to item 1. 4) The interference removal device for a three-dimensional camera according to claim 1, further comprising a filter means for inputting the image information signal read out one field before the delay means.