JPH04352575A - Solid-state image pickup device - Google Patents

Abstract

PURPOSE:To improve accuracy for detecting an oscillating amount by optimumly controlling the period of integrating angular velocity corresponding to an exposure period change due to the selection of a shutter. CONSTITUTION:The integrating periods of integration circuits 15v and 15h to integrate angular velocity detection signals detected by angular velocity sensors 13v and 13h are controlled corresponding to a shutter selecting pulse 11. The oscillating amount is detected based on integrated output signals Mv<11> and Mh<11> from the integration circuits 13v and 13h and a signal (f) detected by an (f) value detection circuit, and movable area designation circuit 17 generates a sensor scan area designating signal mv1 and a line memory read address designating signal mh1 and controls the sensors and a memory. Thus, a video signal suppressing oscillation is outputted. Therefore, the oscillation suppression of the video signal can be improved.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid-state imaging device using a solid-state imaging device, and more particularly to a solid-state imaging device capable of suppressing fluctuations in a video signal caused by vibrations of the solid-state imaging device.

0002

2. Description of the Related Art In recent years, video cameras using solid-state imaging devices have become smaller and lighter, and zoom lenses have become more powerful. Along with this, it is possible to suppress image vibrations caused by vibrations such as camera shake without using a fixed device such as a tripod.
There is an increasing demand for a function that outputs stable video signals.

An example of a solid-state imaging device having such a function is shown in Japanese Patent Publication No. 1-53957. This is an image vibration system in which the vibration amount detection means necessary for suppressing image vibration is configured with means for detecting angular velocity, and the image vibration suppresses the vibration of the video signal based on the vibration amount detection signal detected by the means. The suppressing means may be a means for mechanically moving the lens of a solid-state imaging device or a solid-state imaging device, a means for changing the operation area of a solid-state imaging device, or a means for storing and reading out video signals in a storage device such as an image memory. It is constituted by means for controlling.

[0004]Furthermore, when operating the function, the output video signal is stable against vibrations, but the solid-state imaging device does not vibrate even while charges are being accumulated in the solid-state imaging device. Therefore, in order to deal with the problem that the resolution of the video signal deteriorates, a means for controlling the time for accumulating charge in the solid-state image sensor, that is, the exposure time is provided, and the means is linked to the operation of the function. A method for shortening the exposure time is also shown.

[0005]

In the prior art described above, when determining the vibration angle of the solid-state imaging device from the detected angular velocity, it is essential to integrate the angular velocity over a certain period of time. However, when changing the exposure time using the method described above,
Since the integration period is constant, it is not possible to determine the vibration angle according to the exposure time, and the vibration amount detection signal detected based on this is used to detect the vibration of the video signal due to the vibration of the solid-state imaging device. When suppressed, there is a fear that the suppression rate will decrease.

An object of the present invention is to suppress vibrations in a video signal without being affected by changes in exposure time.

[0007]

[Means for Solving the Problems] In order to solve the above object, the solid-state imaging device of the present invention is provided with an angular velocity integration means whose integration period can be controlled, and the integration of the integration means is adjusted according to selection of an exposure time. Vary the period. This improves the vibration amount detection accuracy and increases the suppression rate of vibrations in the video signal due to vibrations of the solid-state imaging device.

[0008]

[Operation] The present invention operates to switch the integration period of the integrating means in accordance with changes in the exposure time of the solid-state image sensor when suppressing vibrations in the video signal caused by vibrations of the solid-state image sensor due to hand shake or the like. . Thereby, it is possible to prevent the vibration suppression effect from decreasing due to switching the exposure time.

[0009]

[Embodiment] An embodiment of the present invention will be described below with reference to FIG. This figure is a block diagram showing one embodiment of the present invention.

1 is a zoom lens, 2 is a focal length (hereinafter f
3 is a solid-state image sensor (hereinafter referred to as sensor) capable of controlling the exposure time (hereinafter referred to as shutter speed) and scanning area; 4 is a time axis conversion circuit;
5 is a signal processing circuit, 6 is a sensor drive circuit, 9 is a shutter selection circuit, 10 is an integration period setting circuit, 13 is an angular velocity sensor (v and h indicate the vertical direction and horizontal direction, respectively), 14 is an amplifier, and 15 is a Integrating circuit, 16 is vibration amount detection circuit, 17
is a movable area designation circuit.

This is to suppress vibrations in the vertical direction by changing the scanning area of the sensor 1, and vibrations in the horizontal direction by changing the read address of the line memory 41 constituting the time axis conversion circuit 4. The operation will be explained below.

The angular velocity detection signal Mv in the vertical direction of the solid-state imaging device detected by the angular velocity sensor 13v is amplified by the amplifier 14v to a signal amount suitable for subsequent processing.
It is input to the integrating circuit 15v as an amplified signal Mv'. The integration circuit 15v integrates the detection signal Mv' for one field period, and outputs an integral output signal Mv'' indicating the angle of vibration in one field, and the signal Mv'' is output by the f-number detection circuit. It is input to the vibration amount detection circuit 16v together with the detected signal f. Based on the two signals f and Mv'', the vibration amount detection circuit 16v detects the amount of vertical movement of the subject imaged on the light receiving surface of the sensor during one field period, and detects the amount of vibration in the vertical direction. It is output as a signal mv and input to the movable region designation circuit 17.

[0013] Also in the horizontal direction, the angular velocity sensor 13h
, amplifier 14h, integration circuit 15h, vibration amount detection circuit 16
By operating h in the same manner as described above, a horizontal vibration amount detection signal mh is obtained, and this signal mh is input to the movable area designation circuit 17.

The movable area specifying circuit 17 generates a sensor scanning area specifying signal mv1 that moves the scanning area of the sensor by the same amount of movement in the opposite direction of the movement direction based on the vibration amount detection signal mv, and a vibration amount detection signal. A line memory read address designation signal m that moves the read area of the line memory by the same amount of movement in the opposite direction to the movement direction based on mh.
Output h1. A scanning pulse generation circuit 61 constituting the sensor drive circuit 6 receives the sensor scanning area designation signal mv.
1 is input, a scanning pulse 7 is generated. The scan pulse 7 controls the scan area of the sensor 3. Further, the memory control circuit 42 constituting the time axis conversion circuit 4 generates a memory read address 43 by receiving the sensor scanning area designation signal mh1. The read address of the line memory 41 is controlled by the memory read address 43. The above operation enables the signal processing circuit 5 to output a video signal with suppressed vibrations. During the above operations, if the shutter speed is changed by the photographer's will or automatic control,
A shutter selection pulse 11 is controlled by a shutter selection circuit 9, and a shutter control pulse 8 is inputted to the sensor from a shutter control pulse generation circuit 62 forming a sensor drive circuit 6 to change the shutter speed. At this time, the shutter selection pulse 11 is also input to the integration period setting circuit 10,
The integration period setting circuit 10 outputs an integration period setting pulse 12 for setting an integration period according to the shutter speed. The integration period setting pulse 12 is applied to the integration circuits 15v, 15.
h and control the integration period. Thereby, even if the shutter speed is changed, it is possible to prevent the vibration suppression rate of the video signal from decreasing due to the above operation.

The switching of the integration period will be specifically explained using FIG. 2. The figure shows an example of the relationship between shutter speed and integration period.

21 is a vertical synchronizing pulse, 221, 121,
231 are the exposure time, integration period setting pulse, and integration period when the shutter speed is 1/60 seconds, respectively; 222, 122
, 232 represent the exposure time, integration period setting pulse, and integration period when the shutter speed is 1/100 seconds, respectively.

When the center of the sensor accumulation period when the shutter speed is 1/60 seconds is A, one field period from center A1 to the next center A2 is the integration period 23.
An integral period setting pulse 231 is generated so as to set it to 1. Similarly, when the shutter speed is 1/100 seconds, if the center of the accumulation period is B, the integration period is set so that one field period from center B1 to the next center B2 is the integration period 232. Pulse 232 is generated.

In the case of other shutter speeds, the integration period is similarly determined so as to integrate the period from center to center of the sensor accumulation period.

With this method, the angular velocity integration period is controlled in accordance with the shutter speed setting.

FIGS. 3 and 4 are block diagrams showing second and third embodiments of the present invention.

FIG. 3 shows a method in which vibrations in the vertical and horizontal directions are suppressed by changing the scanning area of the sensor 1. In FIG. By inputting the vertical vibration amount detection signal mv and the horizontal vibration amount detection signal mh to the movable region designation circuit 17, a sensor vertical scanning region designation signal mv2 and a sensor horizontal scanning region designation signal mh2 are obtained. The signals mv2, mh2
is input to the scanning pulse generation circuit 61. The scanning pulse generation circuit 61 generates a scanning pulse 7 to control the scanning area of the sensor 3. The rest operates in the same manner as the first embodiment.

In FIG. 4, vibrations in the vertical and horizontal directions are suppressed by changing the read address of the field memory 44 constituting the time axis conversion circuit 4. In FIG.

44 in the figure is a field memory;
5 is a field memory control circuit. By inputting the vertical vibration amount detection signal mv and the horizontal vibration amount detection signal mh to the movable area designation circuit 17, a field memory vertical readout address designation signal mv3 and a field memory horizontal readout address designation signal mh2 are generated. get. The signals mv3 and mh3 are input to the field memory control circuit scanning 45. The field memory control circuit 45 generates a field memory control address and controls the read address of the field memory 44. Others are 1st
It operates in the same way as the embodiment.

[0024]

According to the present invention, by controlling the angular velocity integration period by the exposure time in this manner, it is possible to prevent a reduction in the vibration suppression rate of the video signal due to the vibration of the solid-state imaging device.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a timing diagram illustrating switching of integration periods in the first embodiment.

FIG. 3 is a block diagram showing a second embodiment of the invention.

FIG. 4 is a block diagram showing a third embodiment of the present invention.

[Explanation of symbols]

1...zoom lens, 2...f value detection circuit, 3...Image sensor.

Claims (2)

[Claims] 1. A solid-state imaging device comprising a solid-state imaging device from which a plurality of exposure times can be selected, and a signal processing circuit that outputs an output signal from the solid-state imaging device as a video signal, comprising:
Based on a means for detecting the angular velocity of vibration of the solid-state imaging device, an integrating means for integrating the angular velocity detected by the means over different periods depending on the exposure time, and an amount of vibration calculated from the output value of the integrating means, A solid-state imaging device comprising an image vibration suppressing means for suppressing vibrations of the video signal. 2. A solid-state imaging device comprising a solid-state imaging device from which a plurality of exposure times can be selected, and a signal processing circuit that outputs an output signal from the solid-state imaging device as a video signal, comprising:
means for detecting the angular velocity of vibration of the solid-state imaging device; an integrating means for integrating the angular velocity detected by the means from center to center of the exposure period set by the exposure time; and calculation from the output value of the integrating means. A solid-state imaging device comprising an image vibration suppressing means for suppressing vibration of the video signal based on the amount of vibration generated.