JP2621468B2 - Video camera equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a video camera device that performs shake correction.

2. Description of the Related Art As a conventional shake correction device, for example, Japanese Unexamined Patent Publication No.
No. 0 publication and the technical report of the Institute of Television Engineers of Japan, Vo
l.IINo.3PP.43-48PPOE'8712 (May.1987). These devices are composed of a motion detecting unit for shaking and the like and a motion compensating unit for compensating motion using the output signal.The former has a configuration having a sensor for detecting motion and directly detects a motion from a video signal. There are two types: a configuration using an electric circuit for detection, and the latter includes a configuration using a mechanically correcting motion and a configuration using an image processing circuit that directly corrects a video signal.

On the other hand, in recent years, video camera devices have become increasingly smaller and lighter in the consumer field and the like, and as a motion compensation device, a configuration using an image processing circuit that does not require a mechanical structure is expected to be promising.

A conventional example of a video camera device in which the motion correction unit of the shake correction device is configured by the image processing circuit will be described with reference to FIGS.

FIG. 4 is a block diagram of a conventional video camera device. In FIG. 4, reference numeral 401 denotes a boom lens, 402 denotes an image sensor, 403 denotes a drive circuit of the image sensor 402, 404 denotes a synchronization signal generation circuit, Reference numeral 405 denotes a signal processing circuit that processes a signal output from the image sensor 402, 406 denotes a motion detection device, 407 denotes a motion correction data generation circuit that obtains motion correction data from an output signal of the motion detection device 406, and 408 denotes a normal mode and a motion. A mode selection circuit for selecting a correction mode; 409, a motion correction control circuit for controlling the memory circuit 411 and the interpolation arithmetic circuit 412 using the motion correction data to perform motion correction; and 410, an output signal of the signal processing circuit 405. And 413, a D / A converter for D / A converting the signal subjected to the motion correction processing by the memory circuit 411 and the interpolation operation circuit.

In the conventional video camera device configured as described above, when the motion selection mode is selected by the mode selection circuit 408, the motion detection device 406 and the motion correction data generation circuit 4
07 detects a motion and obtains motion correction data, and based on the motion correction data, the motion correction control circuit 409
By controlling the interpolation calculation circuit 412 and the interpolation operation circuit 412, a video signal which has been subjected to motion correction without shaking is obtained.

The motion correction process at this time will be described with reference to FIG.
In the figure, the effective area of the signal of the image sensor output or the signal processing circuit output is V _{0 in the} vertical direction × H ₀ in the horizontal direction. The effective area of the video signal after motion compensation is the effective area of the original signal (V ₀ ×
H ₀ ) with respect to region (I) (V ₁ × H ₁ ) or region (II) (V ₂
× H ₂ ). This is a function that enlarges a part of the effective area of the original video signal using a memory and an interpolation arithmetic circuit, and a function that makes the area to be enlarged variable by controlling the memory read address based on the motion correction data. This is the result of realizing the motion correction by S,
S ₁ and S ₂ indicate the start position of each video signal effective area, and the output timing is at a position equivalent to the synchronization signal. The range in which the motion can be corrected is uniquely determined by the enlargement ratio of the video signal in the motion correction processing.

The motion correction control circuit includes a memory write address generation circuit, a read address generation circuit based on motion correction data, and the like. The configuration of the read address generation circuit will be described with reference to FIG. FIG. 6 is a block diagram of a read address generation circuit. In the figure, reference numeral 601 denotes an H start address generation circuit that generates a horizontal start address based on a horizontal component of motion data, 602 denotes an H address pitch generation circuit that generates a horizontal address pitch based on an enlargement factor, and 603 denotes a motion. V start address generation circuit for generating a vertical start address based on the vertical component of data, 604 is a V address pitch generation circuit for generating a vertical address pitch based on an enlargement factor, 605, 606, 607, and 608 are latch circuits, and 609 and 612 are selectable A circuit, 610 and 613 are latch circuits, and 611 and 614 are adders. The selection circuit 609 selects the H start address signal at the timing of the H synchronization pulse, and adds the adder at other timings.
Select the output signal of 611. The latch circuit 610 latches the output signal of the selection circuit 609 for each system clock. The latch output signal is added by the adder 611 to the H address pitch signal. Therefore, the output of the latch 610 is a signal obtained by adding one pitch to the H start address every clock. The integer part of the H read address signal thus obtained is used as a memory read address signal, and the decimal part is used as a weight coefficient of an interpolation circuit.

Similarly in the vertical direction, for each H synchronization pulse,
A V read address signal obtained by adding one pitch to the V start address is obtained, of which an integer part is used as a memory read address signal and a decimal part is used as a weight coefficient of an interpolation circuit.

Next, the processing in the interpolation arithmetic circuit will be described with reference to FIG. Circles in the figure indicate data at each sampling point of the video signal read from the memory circuit. On the other hand, the sampling points required for enlarging the video signal and performing motion compensation do not always coincide with the sampling points of the memory circuit output signal, as indicated by the square marks. It is necessary to calculate by interpolation. In the figure, a method is shown in which the data of the sampling point z is obtained by linear interpolation from the surrounding four points A, B, C and D. In the figure, x and y are weighting coefficients obtained from the minor part of the H and V read address signals described with reference to FIG. That is, the data at the sampling point z can be obtained by the following equation.

I (z) = (1-x) ｛(1-y) ・ I (A) + y ・
I (B)｝ + x ｛{(1-y) ・ I (C) + y ・ I (D)｝-
(1) Here, I (z) and I (A) to I (D) indicate data of sampling points z and A to D.

FIG. 8 is a block diagram showing a configuration of an interpolation operation circuit for performing the operation of equation (1). In the figure 801,802,803,804,807,80
8, a multiplier; and 805, 806, 809, adders.

SUMMARY OF THE INVENTION The visual effect of shaking of a video camera device on an image generally depends on the focal length of a lens. Even if the amount of shaking of the video camera device is the same, for example, the zoom position of a zoom lens is on the wide-angle side. In the case of, the swing of the image can be relatively small, but in the case of the telephoto side, the swing of the image becomes large, and the quality of the image is easily deteriorated.

However, in the configuration shown in the conventional example, the range of the fluctuation amount in which the motion can be corrected is uniquely determined by the enlargement ratio of the video enlargement function in the motion correction circuit. Therefore, there is a problem in that the motion compensable range is sufficient on the wide angle side of the zoom position, but is insufficient on the telephoto side. Also, if the image magnification is set to a large value in advance in order to increase the motion compensation range according to the required amount on the telephoto side, the image will be enlarged, so that the characteristics of the lens cannot be fully utilized on the wide angle side. In addition, there is a problem that the image is unnecessarily blurred on the wide-angle side because the resolution is deteriorated as the image is enlarged in principle.

SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide a video camera device which can solve the problem of the motion compensation range due to the zoom position of the zoom lens and can obtain the optimal motion compensation and image quality.

Means for Solving the Problems In order to solve the above problems, the present invention provides a zoom position detecting device, an image sensor, a driving circuit of the image sensor, and a signal for processing an output signal of the image sensor to obtain a video signal. A processing circuit, a motion detection device, and a part of the effective imaging region of the video signal obtained from the image sensor output signal or the signal processing circuit, at least two or more types of control can be enlarged at an enlargement ratio that can be controlled, The video camera apparatus further includes a motion compensation circuit that performs motion compensation by controlling the area to be enlarged based on the output signal of the motion detection apparatus.

The present invention controls the zoom ratio of the image enlargement function of the motion correction circuit using the output signal of the zoom position detection device, thereby achieving the optimum motion correction and image quality according to the change in the zoom position of the zoom lens. Get.

FIG. 1 is a block diagram showing a video camera apparatus according to an embodiment of the present invention. In FIG. 1, 101 is a zoom lens, 102 is an image sensor, 103 is a drive circuit of the image sensor 102, 104 is a synchronization signal generation circuit, 105 is a signal processing circuit that processes signals output from the image sensor 102, 106 is a motion detection device, 107 is a correction data generation circuit that obtains motion correction data from an output signal of the motion detection device 106, 108 is a mode selection circuit that selects a normal mode or a motion correction mode, 114 is a zoom position detection device, 115 Is the motion compensation data generation circuit 1
Motion compensation data output from 07, zoom position detection device
From the zoom position detection signal output from 114 and the mode selection signal output from the mode selection circuit 108, a system control circuit that performs calculations and determinations and outputs a motion correction control circuit, and 109 is output from the system control circuit 115. Based on the motion compensation control signal, the motion compensation control circuit 111 controls the memory circuit 111 and the interpolation arithmetic circuit 112 to perform motion compensation, and 110 performs A / D conversion on the output signal of the signal processing circuit 105.
A / D converter 113 is a D / A converter that performs D / A conversion on the signal subjected to the motion correction processing by the memory circuit 111 and the interpolation operation circuit.

The operation of the video camera device according to the present embodiment configured as described above will be described below.

When the motion correction mode is selected by the mode selection circuit 108, the system control circuit 115 calculates an image enlargement ratio based on the zoom position information obtained from the zoom position detection device 114. Further, based on the motion compensation data obtained from the motion detection device 106 and the motion compensation data generation circuit 107, the image enlargement area is calculated, a read start address and an address pitch of the memory circuit 111 are obtained, and output to the motion compensation control circuit 109. Based on this output data, the motion compensation control circuit 10
Reference numeral 9 controls the memory circuit 111 and the interpolation operation circuit 112 to obtain a video signal which has been subjected to motion correction without shaking.

FIG. 2 is a block diagram showing a configuration of a memory read address generation circuit in the motion compensation control circuit according to the present embodiment.
Shown in the figure. In the figure, 205, 206, 207, 208 are latch circuits, 209, 212
Is a selection circuit, 210 and 213 are latch circuits, and 211 and 214 are adders. Except for directly latching the start address and address pitch in the H and V directions output from the system control circuit as described above, it has the same function as the motion compensation control circuit shown in FIG. 6 in the description of the conventional example. By changing the address pitch data, an image can be enlarged at an arbitrary magnification. In addition, the displacement of the center of the enlarged image caused by the change of the magnification is corrected by changing the start address according to the magnification.

Further, the memory circuit and the interpolation arithmetic circuit in the present embodiment have the same functions as those described in the conventional example.

The processing of the enlargement ratio control in the present embodiment will be described with reference to FIG. In the drawing, the effective area of the image sensor output or the signal circuit output is V _{0 in the} vertical direction × H ₀ in the horizontal direction. The effective area of the video signal after motion compensation for different magnifications a and b (a> b) is the effective area of the original signal (V ₀ ×
H ₀₎ when the area of the enlargement ratio a to _{(III) (V 3 × H} 3), when the enlargement ratio is b is a size of a region _{(IV) (V 4 × H} 4).
In the figure, S, S ₃ and S ₄ indicate the start positions of the respective video signal effective areas, and the output timings thereof are equivalent to the synchronization signal.

In the present embodiment, this enlargement factor is finely controlled in accordance with the change in the zoom position, so that an unnatural change in the angle of view due to zooming is eliminated, and an optimum range of motion correction is set.

In the embodiment of the present invention, the motion compensation circuit is provided behind the signal processing circuit. However, the motion compensation circuit may be provided behind the image sensor. Further, in the embodiment of the present invention, the motion detection device has not been described, but an angular velocity sensor, a vector component detection using a memory, and the like can be performed. However, it is natural that it is not limited to these.

Effects of the Invention As described above, according to the present invention, it is possible to eliminate the excess and deficiency of the motion compensable range due to the change in the position of the zoom lens at the time of motion compensation, and to obtain optimal motion compensation and image quality. The effect is great.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a video camera device in an embodiment of the present invention, FIG. 2 is a block diagram of a memory read address generation circuit in a motion compensation control circuit of the embodiment, Third
FIG. 4 is an explanatory diagram showing a process of controlling the image magnification rate in the embodiment, FIG. 4 is a block diagram of a conventional video camera device, FIG. 5 is an explanatory diagram showing a motion correcting process in the conventional example, FIG. 6 is a block diagram of a memory read address generation circuit in the motion compensation control circuit in the conventional example, FIG. 7 is an explanatory diagram showing processing of the interpolation operation circuit in the conventional example, and FIG. 8 is a conventional example. FIG. 2 is a block diagram showing a main configuration of an interpolation operation circuit in FIG. 102 image pickup device 103 drive circuit 105 signal processing circuit 106 motion detection device 107 motion correction data generation circuit 109 motion correction control circuit 111 memory circuit 112 ... Interpolation arithmetic circuit 114, Zoom position detecting device 115, System control circuit

Claims (1)

(57) [Claims] An optical unit comprising a zoom lens, a zoom position detecting device, an image sensor and a drive circuit for the image sensor;
A signal processing circuit that processes the output signal of the image sensor to obtain a video signal, a motion detection device, or a partial area of the effective imaging area of the video signal obtained from the image sensor output signal or the signal processing circuit, A motion compensating circuit for performing motion compensation by controlling at least two types of control at a magnifying power capable of controlling at least two or more types, and further controlling an area to be enlarged based on an output signal of the motion detecting device; A video camera device wherein an enlargement ratio of an image enlargement function of the motion compensation circuit is controlled using an output signal of a detection device.