JPH0837616A - Imaging device - Google Patents

Abstract

PURPOSE:To provide an image pickup device which can reduce the deterioration in picture quality caused by an error of the image forming position due to the chromatic aberration of a light path changing means that is used for correction of the movements caused by the shake of the image pickup device itself. CONSTITUTION:An optical image passing through a light path changing means 1 and an image forming optical system 2 is divided into plural wavelength components by a spectroscopic means 3. These divided optical images are photographed by the photoelectric transducer means 51 and 52, and the photographed signals are delayed by the delay means 61 and 62. Meanwhile the movement of an image pickup means itself is detected by a movement detection means 4, and the mean 1 is controlled in response to the movement of the image pickup device. At the same time, a delay time control means 9 controls the delay degrees of both means 61 and 62 in accordance with the change of the optical path. Thus it is possible to reduce the deterioration in picture quality caused by the image forming position error of each wavelength component due to the chromatic aberration of the means 1 such as a VAP, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image pickup device, and more particularly to an image pickup device in which movement correction of a three-tube type and a three-plate type image pickup device itself is performed by an optical system.

[0002]

2. Description of the Related Art In recent years, with the reduction in size and weight of consumer-use single-plate type image pickup devices such as video cameras, image distortion caused by unnecessary movement of the image pickup device itself, which is represented by "camera shake" at the time of shooting, is somehow. A function of correcting by a correction unit (hereinafter referred to as motion correction) and providing an image that is easy to see at the time of reproduction is widely used. As means for this motion correction, at present, the movement of the entire image is detected from the image signal at the time of shooting or reproduction, and the image signal to be displayed or recorded according to this detection is the image signal at the time of shooting or reproduction. Of the image pickup device itself by an so-called electronic motion correction method, in which the image pickup device itself is extracted and corrected by performing enlargement processing, and the image forming position of the image is changed according to the detection. A so-called optical motion correction method, in which the correction is performed by changing according to, is often used.

Conventionally, as a feature of both systems, the electronic motion compensation system is based on signal processing, which is advantageous in reducing the size and weight of the image pickup apparatus, but has the drawback of causing image quality deterioration due to enlargement processing. However, the optical motion correction method is disadvantageous in reducing the size and weight because it requires the addition of an optical system for correction, but it has been said that the image quality does not deteriorate.

[0004]

However, in the case of the optical motion compensation method, the image quality deterioration due to the image enlargement processing does not occur, but the image quality deterioration due to the optical factor by changing the optical path, specifically, There is a problem that image quality is deteriorated due to various aberrations, in particular, chromatic aberration caused by a difference in refractive index of an optical system depending on a wavelength of light. Generally, a medium that transmits light has a certain refractive index, but since the refractive index also changes depending on the wavelength of light, if the optical path is changed to correct the movement, the image formation position changes depending on the wavelength of the incident light. Therefore, false color is generated on the screen.

FIG. 3 shows a Vari-Angle Prism (VAP) 10 conventionally used as an optical path changing means.
It shows a state in which 0 is arranged on the front surface 101 of the imaging optical system and an image is formed. FIG. 6A shows the case where the apex angle of the VAP 100 is 0 degree. In this state, the incident light from the optical axis direction forms an image at the same position for any wavelength component (350 nm, 700 nm). On the other hand, FIG. 7B shows a case where the apex angle of the VAP 100 is changed to correct the movement. In this state, the image formation position of the incident light from the optical axis direction shifts for each wavelength component.

Therefore, in the optical correction method, a medium having a high refractive index must be used as the optical path changing means, and it is particularly small in size to optically reduce the chromatic aberration.
There is a problem that it is difficult from the viewpoint of weight reduction and manufacturing cost.

The present invention has been made in order to solve the above problems, and an image pickup apparatus capable of reducing the image quality deterioration due to the shift of the image forming position for each wavelength component due to the chromatic aberration of the optical path changing means such as the VAP. Aim to get.

[0008]

According to a first aspect of the present invention, an optical image incident through an image forming optical system is separated into a plurality of different wavelength components by a spectroscopic means, and a plurality of optical images composed of the separated wavelength components. In the imaging device having a plurality of photoelectric conversion means for performing photoelectric conversion, the motion detection means for detecting the motion of the imaging device itself, and the plurality of photoelectric conversion means on the plurality of photoelectric conversion means according to the detection of the motion detection means. An optical path changing unit that controls an optical path so that an imaging position of a plurality of optical images composed of wavelength components is a position that cancels the movement of the captured image due to the movement of the imaging apparatus itself, and the plurality of photoelectric conversion units. Delay means for respectively delaying the output signals of the optical path changing means, and delay time control for controlling the delay time of the plurality of delay means according to the control state of the optical path change of the optical path changing means. It is provided and the stage.

According to the second aspect of the present invention, the optical image incident through the imaging optical system is separated into RGB wavelength components by a prism, and the three optical images composed of the RGB wavelength components are photoelectrically converted. In an image pickup apparatus having the image pickup device of 1., a first acceleration sensor that detects horizontal acceleration of the image pickup apparatus itself, a second acceleration sensor that detects vertical acceleration of the image pickup apparatus itself, and the first, A picked-up image obtained by moving the image pickup apparatus itself at the image forming positions of the three optical images composed of the separated wavelength components of RGB on the three image pickup elements according to the detection of the second acceleration sensor. VAP for controlling the optical path so as to cancel the movement of the image pickup device, and three memory means for delaying the RGB image signals obtained from the three image pickup devices, respectively. Depending on the apex angle of the serial VAP is provided a memory control means for controlling the delay amount of the three memory means.

[0010]

According to the first aspect of the present invention, the optical image passing through the optical path changing means and the imaging optical system is separated into a plurality of wavelength components by the spectroscopic means, and the optical image of each wavelength component is separated by the plurality of photoelectric conversion means. Each imaged signal is picked up by a plurality of delay means. On the other hand, the movement of the imaging device itself is detected by the movement detecting means, the optical path changing means is controlled according to the movement, and the delay time controlling means controls the delay amount of each delay means according to the optical path change.

According to the second aspect of the present invention, the optical image that has passed through the VAP and the imaging optical system is separated into RGB wavelength components by the prism, and the RGB optical images are picked up by the three image pickup devices and picked up. Each signal is delayed by three memories. On the other hand, the movement of the image pickup device itself is detected by the horizontal and vertical acceleration sensors, the VAP is controlled according to the detection, and the memory control means controls the delay amount of each memory according to the apex angle of the VAP. To do.

[0012]

FIG. 1 shows the first embodiment of the present invention. In FIG. 1, 1 is an optical path changing unit, 2 is an imaging lens system, 3 is a spectroscopic unit, 4 is a motion detecting unit, 51 is a first photoelectric conversion unit, 52 is a second photoelectric conversion unit, and 61 is a first photoelectric conversion unit. Delay means, 62 is a second delay means, 7 is a video signal processing means, 8
Is a video signal output means, and 9 is a delay time control means.

Next, the operation will be described. The light from the subject is separated into two kinds of wavelength components by the optical path changing means 1, the imaging lens system 2 and the spectroscopic means 3. The optical image of each wavelength component is imaged on the photoelectric conversion means 51 and 52, the signal of each wavelength component photoelectrically converted is generated, and the signal of each wavelength component is input to the delay means 61 and 62. The signals of the respective wavelength components input to the delay means 61 and 62 are delayed by the delay time determined by the delay time control means 9 and sent to the video signal processing means 7, and the processed signals are output by the video signal output means 8. To be done.

On the other hand, the optical path changing means 1 comprises the motion detecting means 4
Based on the signal indicating the movement of the image pickup apparatus itself detected by the optical path changing unit, the image forming positions of the photoelectric conversion units 51 and 52 are set to positions to cancel the movement of the image pickup image caused by the movement of the image pickup apparatus. Control 1 Further, the delay time control means 9 controls the delay times of the delay means 61 and 62 based on the operating state of the optical path changing means 1. This controlled delay time is selected so as to correct the deviation of the image forming position for each wavelength of the incident light caused by the change of the chromatic aberration due to the change of the optical path in the optical path changing means 1.

By the above operation, the signal of each wavelength component input to the video signal processing means 7 is corrected for the movement of the image pickup device itself, and the image forming position shift for each wavelength component due to the chromatic aberration generated in the optical path changing means 1. Is also corrected, and a good output video signal is obtained.

FIG. 2 shows a second embodiment of the present invention. In the figure, 11 is VAP, 12 is a horizontal actuator, 13 is a vertical actuator, 14 is an imaging lens system, 15 is a prism, 16 is a motion correction circuit, 17 is a horizontal acceleration sensor, 18 is a vertical acceleration sensor, 19
R, 19G, 19B are image pickup devices such as CCD, 20R, 2
0G, 20B are A / D converters, 21R, 21G, 2
1B is a memory, 22 is a memory control circuit, 23 is a video signal processing circuit, 24 is a luminance signal output terminal, 25 is a chroma signal output terminal, 26 is an adder, 27 is a composite video signal output terminal, and 28 is a microcomputer. .

Next, the operation will be described. Light from the subject is separated into RGB wavelength components through the VAP 11, the imaging lens system 14, and the prism 15, and the image pickup device 19R,
An image is formed on the light receiving surfaces of 19G and 19B and photoelectrically converted to RG.
A B signal is generated. The RGB signals are digitally converted by the A / D converters 20R, 20G, 20B and input to the memories 21R, 21G, 21B. Memory 21
The RGB signals input to R, 21G, and 21B are written and read by the control signal sent from the memory control circuit 22, and sent to the video signal processing circuit 23.
The video signal processing circuit 23 generates a video signal conforming to the standard from the sent RGB signals, that is, a luminance signal and a chroma signal, outputs the luminance signal to the luminance signal output terminal 24, and outputs the luminance signal from the chroma signal output terminal 25 to the chroma signal. Output a signal. The luminance signal and the chroma signal are added by the adder 26 to form a composite video signal, which is output from the composite video signal output terminal 27.

On the other hand, the motion correction circuit 16 forms an image on the image pickup device 19R, 19G, 19B based on the acceleration signal indicating the acceleration of the image pickup device itself detected by the horizontal acceleration sensor 17 and the vertical acceleration sensor 18. The movements of the horizontal direction actuator 12 and the vertical direction actuator 13 are controlled so that the position is a position where the movement of the picked-up image due to the movement of the image pickup apparatus is canceled. Further, the data indicating the operating positions of the horizontal direction actuator 12 and the vertical direction actuator 13 is read by the microcomputer 28, and the timings of writing and reading of the memories 21R, 21G, 21B controlled by the memory control circuit 22 are adjusted based on the data. To be done. The timings of writing and reading are selected so as to correct the shift of the image forming position for each wavelength of the incident light caused by the change in chromatic aberration due to the change in the apex angle of the VAP 11.

By the above operation, the video signal processing circuit 23
The RGB signal input to is the one in which the movement of the image pickup apparatus itself is corrected and the image forming position shift due to the chromatic aberration caused by the movement of the VAP 11 is also corrected, and a good output video signal is obtained.

[0020]

As described above, according to the invention of claim 1,
When the optical image is separated into a plurality of wavelength components and the optical image of each wavelength component is captured by a plurality of photoelectric conversion units, the movement of the image pickup apparatus itself is detected, and the optical path changing unit is controlled according to the movement. By configuring the delay amount of the output signal of each photoelectric conversion unit according to the state of the optical path change, when performing the optical motion correction, for each wavelength component due to the chromatic aberration generated in the optical path change unit. The deviation of the image forming position can be corrected by a simple method, and there is an effect that the image quality can be improved.

According to the second aspect of the invention, when the optical image is separated into R, G and B wavelength components and the optical image of each wavelength component is captured by the three image capturing elements, the image capturing apparatus itself Motion is detected, VAP is controlled according to this motion, and
Since the delay amount of the output signal of each image sensor is controlled by using the memory according to the state of the optical path change by the VAP, the chromatic aberration generated in the VAP when performing the optical motion correction using the VAP is suppressed. The shift of the image forming position for each wavelength component due to the correction can be corrected by a simple method, and there is an effect that the image quality can be improved. Further, according to the present invention, in a three-plate type image pickup device that requires high image quality, effective motion correction can be performed without degrading image quality.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing a second embodiment of the present invention.

FIG. 3 Vari-Angle Prism (VAP)
FIG. 6 is a configuration diagram showing a shift in image forming position for each wavelength component caused by a change in apex angle of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical path changing means 2 Imaging lens system 3 Spectral means 4 Motion detection means 7 Video signal processing means 8 Video signal output means 9 Delay time control means 11 VAP 12 Imaging lens system 13 Horizontal actuator 14 Vertical actuator 15 Prism 16 Movement Correction circuit 17 Horizontal acceleration sensor 18 Vertical acceleration sensor 19R, 19G, 19B Imaging device 21R, 21G, 21B Memory 22 Memory control circuit 28 Microcomputer 51 First photoelectric conversion means 52 Second photoelectric conversion means 61 First Delay means 62 Second delay means

Claims (2)

[Claims] 1. A plurality of photoelectric conversion means for spectrally converting an optical image incident through an imaging optical system into a plurality of different wavelength components by a spectroscopic means, and photoelectrically converting a plurality of optical images composed of the respective spectrally separated wavelength components. In the image pickup apparatus, a motion detection unit that detects a movement of the image pickup apparatus itself, and image formation positions of a plurality of optical images composed of the spectral wavelength components on the plurality of photoelectric conversion units according to the detection of the movement detection unit. An optical path changing means for controlling an optical path to a position where the movement of the captured image due to the movement of the imaging device itself is offset, and a plurality of delay means for respectively delaying output signals of the plurality of photoelectric conversion means. An image pickup apparatus comprising: delay time control means for controlling the delay time of the plurality of delay means according to the control state of the optical path change of the optical path change means. 2. An RG obtained by splitting an optical image incident through an image forming optical system into RGB wavelength components by a prism and splitting the spectrum.
B In an image pickup apparatus having three image pickup elements for photoelectrically converting three optical images composed of respective wavelength components, a first acceleration sensor for detecting a horizontal acceleration of the image pickup apparatus itself, and a vertical acceleration of the image pickup apparatus itself. A second acceleration sensor for detecting directional acceleration, and the third acceleration sensor according to the detection of the first and second acceleration sensors.
The optical path is controlled so that the image forming positions of the three optical images composed of the separated RGB wavelength components on the individual image pickup elements are positions that cancel the movement of the image pickup image due to the movement of the image pickup apparatus itself. VAP, three memory means for respectively delaying RGB image signals obtained from the three image pickup devices, and memory control for controlling the delay amount of the three memory means according to the apex angle of the VAP. And an image pickup device.