JPS587977A - Correcting device for peripheral vertical skew - Google Patents

Abstract

PURPOSE:To correct the skew in lower and upper peripheral parts, by superposing a signal, which is obtained by multiplying a signal extracted from the vertical deflecting saw tooth wave signal and the horizontal deflecting saw tooth wave signal, as a skew correcting signal to the vertical deflecting saw tooth wave signal. CONSTITUTION:A vertical deflecting saw tooth wave signal V inputted from a terminal 2 is inputted to a clip circuit 4, and the part from the maximum value to a prescribed level is clipped and extracted and is supplied to one input of a multiplier 3. The part from the minimum value of a prescribed level of the signal V is clipped and extracted similarly and is supplied to one input of a multiplier 5. A horizontal deflecting saw tooth wave signal H is supplied to the other inputs of multipliers 3 and 5, and signals b1 and b2 are outputted. These signals are supplied to multipliers 7R, 7G, and 7B and multipliers 8R, 8G, and 8B respectively, and obtained correcting signals Rc1, Gc2, and Bc1 and correcting signals Rc2, Gc2, and Bc2 are added and are superposed to the vertical deflecting signal, thereby correcting the peripheral skew.

Description

[Detailed Description of the Invention] The present invention provides color television cameras, etc., which allow registration in the peripheral area of the image to be independently transmitted to each station, and to obtain positive 1iML + E signals.
'.

The vertical skew around the sleeves gives a negative flash.

It was used as an imaging device for color television, and used the whale tube of Toshiki Hye, which had an unusual spectral sensitivity, and synthesized the video signals from the first and other camera operators. Color video signal? Many television cameras are used.

Therefore, in the imaging device Yt which obtains the final video signal by collecting video signals from a plurality of image pickup tubes, such as a color preview camera,
Lr cannot be achieved unless the images obtained from each of the several image pickup tubes are accurately superimposed.

This kind of overlapping of images is called registration, and it requires correction of geometric distortions of the gods' forms based on the causes of the gods. Conventionally, a so-called skew (SKgW) correction method has been mainly used for distortion correction.

However, in this conventional skew correction method, the distortion is corrected by uniformly tilting the horizontal scanning line over the entire image plane, so it is difficult to correct the distortion by uniformly tilting the horizontal scanning line over the entire image plane. When registration is required, these I(
・If the images of channels G and H are all distorted into a parallelogram shape, it is possible to perform effective correction, but
In 5, if the linearity of the image plane was poor and accompanied by ladder-shaped distortion, the deviation in the center of the image plane would be 1%, and the deviation would be larger on the sides.On the other hand, if the inclination mI was corrected, G in the club
However, it is possible to perform the registration relatively correctly at most positions, including the center of the image plane. Regarding the registration at the front side of the image, which is easily affected by variations in characteristics that exist in each case, Iii; I
Therefore, it is difficult to correct these independently, and there is a drawback that a large registration error tends to remain in this area.

The purpose of "Unexploded" is to eliminate the drawbacks of the prior art described above, to enable skew correction in the peripheral area independently of the overall 7:L skew correction including the central part of the image plane, and to create an image including the peripheral area. To provide a skew correction device capable of sufficiently performing registration correction over the entire surface.

In order to achieve this purpose, the present invention clips and extracts the part from the maximum value of the sawtooth wave signal for vertical deflection to a predetermined voltage value and the part from the minimum value to a predetermined voltage value, and extracts these parts. The signal obtained by multiplying the horizontal polarization sawtooth signal by the horizontal polarization sawtooth signal is superimposed on the vertical polarization sawtooth signal as a skew correction signal, and the skew correction can be performed at the lower periphery and the upper periphery independently of the center of the image. It is characterized by the fact that

Hereinafter, an embodiment of the 1-side vertical skew correction device according to the present invention will be described with reference to the drawings.

Figure 1 shows an embodiment of the present invention in which the present invention is applied to a color television camera consisting of 8 channels of IT (red), G (green) + B (blue). 2 is an input terminal to which a vertical 1 m deflection sawtooth signal V is supplied; 3 is a first multiplier; 4 is an upper clip circuit; 5 is a second multiplier;
6 is the lower clip circuit, 7 J7 G, 7 B −
1i H・, 12(t, 12BLl), respectively corresponding to R channel and () channel, and 8 corresponding to B channel.
7R17G, 7B are multipliers for axis 8, 8FL, 8G, 8B are fourth multipliers, 9tt, 9Q
,9B,10) L,IOG.

10B is an amplifier, 11)t, 11G
, 11 B is an adder, 12 R, 12G, 12
B is a vertical deflection device.

Next, the operation of this embodiment will be explained.

The vertical deflection sawtooth signal (■) supplied from the input terminal 2 is input to the upper clipping circuit 4, and as shown in FIG. It is extracted as a signal a1 shown in FIG. Similarly (here, the vertical deflection sawtooth signal V is the lower clip IO1
As shown in Fig. 2 (E), the portion Pd from the minimum value of the vertically deflected sawtooth signal V to a predetermined level is clipped and the signal (Zt is extracted, 2 is supplied to one input of the multiplier 5.

On the other hand, the horizontal deflection sawtooth wave signal H shown in FIGS.
As a result, the output of the first multiplier 3 is the signal b1 shown in FIG. will be obtained respectively. In addition, in Fig. 2 (Δ) to σD, 1
2 represents one vertical scanning period, and 12 represents one horizontal scanning period.

Therefore, this signal 1]1 is sent to the eighth multiplier 7R17017.
B is supplied to a single force of human power, and any G is applied over a predetermined range from the stopping rod property to the negative polarity.
and increase the output signal +11i14 unit 9J9G
, 9B to a predetermined level and the correction signal R61+GCl
＋' B (get yo.

Similarly, the output signal b2 of the second multiplier 5 is
Direct current control voltages Rb, Gb are supplied to the human power of the devices BR, BG, and sB and can be adjusted in level arbitrarily over a predetermined range from positive polarity to negative polarity.

Bb and the multiplication output is sent to amplifiers 10R, 10G,
The correction signal RC2r G is amplified to a predetermined level by IOB.
Obtain C2+ BC2.

Then, these correction signals are added to an adder circuit 11R911G,
After summing each at IIB, the corresponding vertical deflection device 1
2 R+ 12 G and 12 B, and is superimposed on the vertical deflection signal to perform peripheral skew correction.

Therefore, it is now assumed that the control voltage Rα supplied to the eighth multiplier 7R is set to a positive voltage.

Then, the output O of the amplifier 9R appears as a correction signal R.
c1 becomes a signal with a waveform as shown in FIG. 8(A), which is supplied to the vertical deflection device 12R via the adder circuit 11R. Figure 8 (As shown in Bl, on the left side of the lower predetermined range m...(min), the interval between the horizontal scanning lines becomes narrower, so the image shrinks from the broken line state to the solid line as shown by arrow A. On the left side, the interval between the horizontal scanning lines is wide, so study it as shown by the 1 arrow in the image and change it from the broken line to the solid line. The ratio of the amount of contraction on the left side indicated by arrow A and the amount of extension on the right side indicated by arrow A, that is, the amount of inclination of the upper edge of the image plane to the right side, is determined by the positive polarity voltage value of control voltage Ra. It can be changed arbitrarily.

In addition, if the polarity of the control voltage Rα is made negative, the correction signal FL
cl becomes as shown in FIG. 8. Therefore, at this time, the imaging surface by the R channel image pickup tube is as shown in FIG. Since the interval becomes wider and narrower on the right side, the image in this part will extend as shown by the arrow A on the right side, and will shrink on the right side as shown by the arrowhead. At this time, the tilt of the peripheral part of the lower image plane 111!1 to the left can also be arbitrarily controlled by the negative polarity voltage value of the control voltage lea.

Next, the control' voltage R supplied to the fourth multiplier 8R
Assume that b is set to a positive voltage. Then, increase lll
The correction signal 1to2 appearing at the output of the 1il circuit 101 becomes a signal with the waveform shown in FIG.
As a result, on the imaging surface of the R channel image pickup tube, as shown in FIG.
In the part, the spacing between horizontal scanning lines is narrow on the left side < r
(As shown by arrow A, the image shrinks from the broken line state and becomes like a solid line. Conversely, on the right side, the interval between the horizontal scanning lines becomes wider, and the image extends from the broken line state to a solid line, as shown by the arrow opening.) At this time, the ratio of the shrinkage -I in the left part indicated by the arrow A to the extension amount in the right part indicated by the arrow opening, that is, the left side of the upper edge of the image. The amount of the slope can be arbitrarily controlled according to the positive polarity voltage value of the control voltage Rh.

0 Also, the control voltage Rb supplied to the fourth multiplier 81
If the polarity of is made negative, the waveform of the correction signal RC2 becomes as shown in Fig. 8 (
Therefore, as shown in FIG. 8 (1-1), on the imaging plane by the R channel image pickup tube, in the predetermined range n on the upper side, the interval between the horizontal scanning lines on the left side is as shown in (3). spreads out, so the image extends from a broken line to a solid line, as shown by arrow A. On the other hand, on the right side, the interval between horizontal scanning lines becomes narrower, so the image changes from a broken line to a solid line, as shown by arrow A. As a result, the direction and aim of the inclination of the upper edge of the image plane can be arbitrarily controlled depending on the polarity and voltage value of the control voltage tb.

The above is an explanation of the imaging surface of the R channel image pickup tube, but the same applies to the other G channels and R channels, and the control voltage Oa supplied to the eighth multiplier 7G is changed from positive polarity to If the image pickup tube of the G channel controls the lower part of the imaging surface to
) or as shown in Fig. 8(D), and if the control voltage of the fourth multiplier 8G is controlled, Fig. 8(G),
It is possible to change the image as shown in FIG. 8 (I()).The image can also be changed as shown in FIG. (1u) , (1)) , ()')
, ()() G・- Can be arbitrarily changed as shown.

Therefore, according to the above embodiment, the shape of the lower and upper portions of the imaging surface by the image pickup tube of each channel can be arbitrarily controlled independently of the central portion. From this, it is possible to perform sufficient registration correction on the entire image, including not only the central part but also the lower part and the first part.

As explained above, 4.1, according to the present invention, skew correction for the lower and upper portions of an image can be performed independently of each other and independently of the central portion of the image, which makes it possible to perform skew correction for the lower and upper portions of the image. Even when there is a ladder-shaped distortion on the image plane, it is possible to perform sufficient registration correction over the entire image plane, and the remaining registration error can be avoided. i:!+i
It is possible to provide a rigid side suspension correction device for a television camera that can obtain high quality color television double length RR.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the rigid-sided vertical skew sleeve +E device according to the present invention, Figs. 2 (A) to (11) are waveform diagrams for explaining the operation of Le 11, Fig. 3 (A) ~(IQ!;、
FIG. 1 is a waveform diagram and a schematic diagram of an image plane for explaining one effect. 1...Horizontal deflection saw wave signal υ/input terminal, 2
...Vertical 1μ deflection sawtooth signal input terminal, 3...
- First multiplier, 4... Upper clip circuit, 5...
...Second multiplier, 600. . . . Lower clip circuit, 7 R・, 7 (), 7 B . . . 8th multiplier, 8 R+ 8 (÷, 8 B . . . 4th multiplier , 11 R, 11 G, 11 B...
・Adder circuit, 12 R + 12 G + 12B ・・
・・・Tarupari sieving device. Agent Patent attorney Takeshi Kenji Department (1 person) 2 figures □ (B) l : l :tF*
11 (f'3 times (B) (tsu) ---441-1

Claims (1)

[Claims] In a vertical skew correction device that superimposes a sawtooth voltage synchronized with the horizontal deflection operation on the vertical deflection signal as a correction signal, the part from the maximum value of the vertical deflection signal to a predetermined voltage value and the part from the minimum value to a predetermined voltage value first and second clip circuits that extract the first and second sawtooth voltages by clipping the parts of first and second multiplier circuits, each of which is supplied with a horizontal deflection signal; 8th and 4th multiplication circuits to which 111 flow control 'm pressure that changes over a predetermined positive and negative range is supplied to the human power of the other power, with the output of the neck being the human power of one power, and these multiplier circuits; The output of the adder circuit is superimposed on the vertical deflection signal as the above-mentioned correction signal. +7)L on the sides,
This is a 1M side 11' + straight sugiyure 11 formal clothing item characterized by configuring distortion compensation 11.- to one eye.