WO2006043315A1 - 撮像装置および撮像装置を備えた携帯機器 - Google Patents
撮像装置および撮像装置を備えた携帯機器 Download PDFInfo
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- WO2006043315A1 WO2006043315A1 PCT/JP2004/015478 JP2004015478W WO2006043315A1 WO 2006043315 A1 WO2006043315 A1 WO 2006043315A1 JP 2004015478 W JP2004015478 W JP 2004015478W WO 2006043315 A1 WO2006043315 A1 WO 2006043315A1
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- image
- optical system
- image sensor
- image pickup
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/68—Control of cameras or camera modules for stable pick-up of the scene, e.g. compensating for camera body vibrations
- H04N23/682—Vibration or motion blur correction
- H04N23/684—Vibration or motion blur correction performed by controlling the image sensor readout, e.g. by controlling the integration time
- H04N23/6845—Vibration or motion blur correction performed by controlling the image sensor readout, e.g. by controlling the integration time by combination of a plurality of images sequentially taken
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/68—Control of cameras or camera modules for stable pick-up of the scene, e.g. compensating for camera body vibrations
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/68—Control of cameras or camera modules for stable pick-up of the scene, e.g. compensating for camera body vibrations
- H04N23/681—Motion detection
- H04N23/6811—Motion detection based on the image signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/68—Control of cameras or camera modules for stable pick-up of the scene, e.g. compensating for camera body vibrations
- H04N23/681—Motion detection
- H04N23/6812—Motion detection based on additional sensors, e.g. acceleration sensors
Definitions
- the present invention relates to a method for detecting the amount of camera shake or image blur for detecting and correcting camera shake or image blur in a portable device equipped with an electronic camera such as a digital still camera or a cellular phone. .
- Technology related to camera shake correction mainly includes camera shake amount measurement means for detecting the direction and amount of camera shake (camera shake information) and camera shake information detected by the camera shake amount measurement means. It consists of two parts: a correction means that eliminates the blur component from the captured image. There are several known methods for correcting camera shake.
- Patent Document 1 there is a means for detecting the presence or absence of camera shake using a distance measuring sensor.
- an optical sensor for measuring the distance to the subject is provided independently of the main image sensor, and the presence or absence of camera shake is detected using the output of the distance measuring sensor.
- the optical sensor that this technology uses as a camera shake sensor is originally intended for distance measurement, and is a one-dimensional line sensor that is not a two-dimensional image sensor that can measure the direction and amount of camera shake. It is possible to detect the presence or absence of camera shake with a line sensor. Information on the direction and amount of camera shake necessary for camera shake correction cannot be obtained. For this reason, a camera system that uses this technology can only realize a camera shake warning function that detects the presence of camera shake and notifies the user of the occurrence of camera shake, and realizes a camera shake correction mechanism that eliminates camera shake. I can't!
- Patent Document 2 and Patent Document 3 describe camera shake measurement means for detecting the amount of camera shake using information on a plurality of continuous images (frames) output from the main image sensor. . Since the camera shake amount measuring means of this method uses the video signal output from the main image sensor, it is higher than the frame frequency of the main image sensor, and it is impossible to detect frequency camera shake. Usually, the frame frequency of the image sensor is about 30Hz, and the vibration component generated when holding a portable device with one hand includes a frequency component up to about 100Hz. For this reason, it is impossible to detect camera shake of a portable device using this method.
- the above-mentioned patent documents are also intended for applications where high-frequency vibration components do not occur unlike fixed cameras or surveillance cameras that are not intended for portable cameras.
- Patent Document 4 describes a camera shake amount measuring means for detecting a camera shake amount using an angular velocity sensor. With this method, it is possible to measure the amount of camera shake in the direction in which the angular velocity sensor is arranged, and it is also possible to deal with high-frequency vibration frequency components.
- the vibration that is greatly involved in blurring of the captured image in normal shooting is a shake in the direction of rotating the optical axis of the imaging means.
- the vibration around the x-axis is Equipped with two angular velocity sensors that detect rotation around the y axis, it is possible to detect the amount of camera shake efficiently against camera shake in the direction of rotating the optical axis. Since the principle is mechanical, which uses the inertia of a rotating object, it is difficult to achieve both miniaturization and high precision.
- the two angular velocity sensors can only detect the rotation of the optical axis of the camera, For example, if the camera shake is measured in such a way that the camera moves parallel to the direction perpendicular to the optical axis, the number of angular velocity sensors increases, or a separate acceleration sensor that detects linear acceleration is provided. It ’s complicated. Furthermore, camera shake can be detected when the camera itself moves and vibrates, but effective detection cannot be performed for image blurring when the subject moves.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2003-344890
- Patent Document 2 Japanese Patent Laid-Open No. 2004-015515
- Patent Document 3 Japanese Patent Laid-Open No. 2003-209735
- Patent Document 4 JP 2002-207232 A
- An imaging apparatus includes an optical system in which light from a subject is incident, a first imaging device that receives light of subject power through the optical system and outputs an image of the subject, A second image sensor for receiving a light of subject power via the optical system and outputting a plurality of images while outputting the first image sensor power; and the second image sensor A plurality of image forces taken by a blur amount extraction means for calculating a blur amount by correlating two consecutive images, and an image force blur component output from the first image sensor using the calculated blur amount. And a blur component removing means for removing.
- the present invention has been made to solve the above-described problems, and it is possible to accurately detect the amount and direction of not only the rotation of the optical axis but also the blurring component such as parallel movement, thereby reducing the size.
- An object of the present invention is to provide an imaging device that is easy to operate and a portable device equipped with the imaging device. Means for solving the problem
- An imaging apparatus includes an optical system in which light from a subject is incident, a first imaging device that receives light of subject power through the optical system and outputs an image of the subject, A second image sensor for receiving a light of subject power via the optical system and outputting a plurality of images while outputting the first image sensor power; and the second image sensor A plurality of image forces taken by a blur amount extraction means for calculating a blur amount by correlating two consecutive images, and an image force blur component output from the first image sensor using the calculated blur amount. Removal And a blur component removing means to be removed.
- An imaging apparatus includes an optical system in which light from a subject is incident, a first imaging device that receives light of subject power through the optical system and outputs an image of the subject, A second image sensor for receiving a light of subject power via the optical system and outputting a plurality of images while outputting the first image sensor power; and the second image sensor A plurality of image forces taken by a blur amount extraction means for calculating a blur amount by correlating two consecutive images, and an image force blur component output from the first image sensor using the calculated blur amount. It is possible to obtain an imaging apparatus having a camera shake correction function that is easy to downsize with a simple configuration.
- FIG. 1 is a diagram showing a configuration of an imaging apparatus according to Embodiment 1 of the present invention.
- FIG. 2 is a diagram for explaining a method of extracting camera shake according to the present invention.
- FIG. 3 is an external view of a mobile phone equipped with the imaging device of the present invention.
- FIG. 4 is a diagram showing a configuration of an imaging apparatus according to Embodiment 2 of the present invention.
- FIG. 5 is a diagram showing a configuration of an imaging apparatus according to Embodiment 3 of the present invention.
- FIG. 1 is a configuration diagram of a camera system equipped with an image sensor including a camera shake amount measuring unit according to Embodiment 1 of the present invention.
- the imaging device according to the first embodiment includes a main imaging device 3a and a sub-imaging device 3b, and a main optical system such as a lens such as a lens. 2a and sub optical system 2b.
- the sub optical system 2b is mounted substantially parallel to the main optical system 2a, and forms incident light 1 from the same subject received by the main optical system 2a on the photoelectric conversion surface of the sub image sensor 3b.
- the sub-imaging element 3b is used for measuring the amount of camera shake, and does not generate information for directly forming an output image, so its imaging range is that of the main optical system 2a. There is no problem in using an optical system that is set narrower than the range and whose optical performance such as transmitted light amount and resolution is lower than the main optical system 2a.
- the main image sensor 3a converts light from a subject incident via the main optical system into an electric signal and generates an image signal, but is used for a general digital still camera.
- the number of pixels is about 300,000 to 8 million pixels, and the exposure time for taking a single image is about several seconds for 1Z1000 seconds. Of these, the effect of camera shake is significant when the exposure time is longer than lZioo seconds.
- the main image sensor 3a uses the same image sensor as a general digital still camera.
- the sub image sensor 3b since the sub image sensor 3b only needs to detect the amount of camera shake, for example, a black and white image sensor with about 10,000 pixels is used, and one pixel compared to the main image sensor 3a.
- the exposure time can be shortened by increasing the light receiving area and increasing the sensitivity. Therefore, it is possible to capture and output more than 2000 images per second, and the sub image sensor 3b can generate a plurality of image signals while the main image sensor 3a exposes and images one image.
- the imaging condition control means 9 uses the optimum output image signal from the main image sensor 3a. They are automatically controlled to be in a state.
- the image signal thus obtained is input to the analog signal processing means 4 and subjected to analog signal processing such as gamma processing. Further, the analog image signal is AZD converted by the AZD conversion means 5 and converted into a digital signal. Is converted. This digital image signal is input to the digital image processing means 6, and light quantity adjustment and color adjustment are performed so that an appropriate image signal can be generated. For example, YCbCr format suitable for generating JPEG compressed images is converted into image output according to the purpose.
- the image signal subjected to the image processing is input to the blur component removing unit 7.
- the blur component removal means 7 receives a digital image signal that has undergone image processing from the main image sensor 3a, and also has a blur amount vector from which the image force captured by the sub image sensor 3b is extracted from the blur amount extraction means 8. Entered.
- the blur component removing means 7 performs image restoration using, for example, a Wiener filter based on the magnitude and direction of the input blur amount vector.
- the Wiener filter is a restoration operator that gives an image that minimizes the mean square error from the original image. Specifically, it is expressed by the following formula and is processing in the frequency space.
- F (u, v) corrected image
- G (u, v) degraded image
- H (u, v) spread function
- ⁇ constant.
- the spread function H (u, v) is defined on the basis of the blur amount vector, and an image without the above-mentioned force is generated and output.
- the output image is stored in a storage medium such as a memory card after being converted into a standard image format such as JPEG even if it is a digital still camera.
- FIG. 2 is a diagram for explaining the operation of the blur amount extracting means 8, showing the output of the sub-imaging device and the blur amount output calculated by taking the correlation from the output. Since the main image pickup device 3a has a large number of pixels, the sensitivity is lower than that of the sub image pickup device and high-quality image pickup is performed, so that the exposure time becomes longer. For this reason, there is a high possibility that an image including blur is output due to the camera or subject moving during the exposure time. Therefore, as shown in FIG. 2, while the exposure to the main imaging element 3a is completed, the sub-imaging element 3b outputs an image a plurality of times and obtains a correlation between the plurality of images as shown in FIG. The amount of blur within the exposure time of element 3a is calculated.
- the plurality of image data output from the sub image sensor 3b are respectively input to the blur amount extracting means 8.
- the blur amount extraction means 8 compares and correlates temporally continuous images, extracts how the subject image captured in the sub-imaging element 3b moves, and outputs it as a blur vector. The Specifically, for each pixel of the output image A of the sub-imaging device, the absolute value or square value of the difference from all the pixels of the output image B that is the next image of the output image A is calculated. If the image does not move due to movement of the subject, the above differences should all be zero.
- the difference calculation result of a pixel and the surrounding pixels are calculated based on the absolute value of the difference calculated for each pixel as described above. Combine with the difference calculation result to calculate how the camera shakes, and calculate the blur vector as shown in blur output A in Fig. 2.
- the blur amount may be calculated by taking the difference for each pixel column and each row. This reduces accuracy but reduces the amount of computation.
- the sub-imaging device and the camera shake extraction unit according to the present invention are mounted on an optical mouse that is widely used for operating a personal computer with a semiconductor device having a similar configuration.
- the image sensor in the optical mouse is a small solid-state image sensor with about 10,000 pixels, which captures and outputs an image of 2000 frames or more per second.
- a simple plastic lens with a focal length of several millimeters is attached to the sensor, and when the optical mouse is placed on a flat surface, the image of the flat surface is formed on the imaging surface of the sensor.
- an LED is provided to illuminate the plane that is the subject and secure the illuminance for imaging.
- the output image signal of the sensor is transmitted to an arithmetic circuit formed on the same semiconductor chip as the sensor itself, and fine irregularities and shadows on the plane imaged by the sensor are extracted, and between the frames of these images.
- This blur detection algorithm is described in Patent Documents 2 and 3, for example. If such an optical mouse configuration is used, the sub-imaging device 3b and the camera shake amount extraction means 8 of the present invention can be formed on the same chip, so that it operates stably without adjustment and at a low cost. Can be manufactured.
- FIG. 3 shows an example of the appearance when the imaging apparatus according to Embodiment 1 of the present invention is applied to a mobile phone.
- This is a view from the back of a folded phone with the LCD side housing Only the surfaces of the main image sensor optical system and the sub image sensor optical system are visible on the back of the body.
- 12 is an LCD side case
- 13 is a rear LCD screen
- 14 is a key side case. While the main image sensor captures a single image, the sub-image sensor placed beside it captures multiple images, measures the amount of blur from the image power of the multiple images, and the main image sensor Estimate the blur component contained in the captured image.
- a separate sub optical system independent of the main optical system is provided.
- a main camera for still image shooting Since it is equipped with two sub-camera image sensors that take pictures of the user himself when using a videophone, the camera can also be used to extract the amount of hand blur when taking a still image with the main camera. Good.
- Such sub-cameras may not be accurate when measuring the amount of camera shake because their optical axes are not necessarily in a parallel relationship with the main camera.
- the camera shake amount detection means and the sub camera can be integrated into one image pickup means, a mobile phone that corrects blurring can be obtained without increasing the size of the apparatus.
- the first embodiment relates to an image pickup apparatus that removes the blur component by signal processing based on the measured blur amount vector, but in the second embodiment, based on the measured blur amount vector.
- the lens and sensor are mechanically driven to correct the blur component.
- FIG. 4 is a diagram showing the configuration of the camera system according to the second embodiment. As shown in the figure, the amount of blur is measured by a plurality of output images from the sub-imaging device 3b as in the first embodiment.
- the extracted blur amount is input to the optical system driving means 9.
- the lens and the main image sensor 3a included in the main optical system 2a are moved in two directions ⁇ and ⁇ that are perpendicular to each other in the plane perpendicular to the optical axis Z in accordance with the shake amount vector. This corrects the image blur by decentering the optical axis ⁇ .
- the optical system dedicated to the sub-imaging device is provided.
- the light passing through the main optical system 2a also has the same force as the mirror 10 and the mirror 11. It is possible to share the main optical system and the sub optical system by dividing the image by the dividing means and supplying it to the sub image pickup element 3b. During optical zoom, the field of view changes according to the main optical system 2a. [0033] Embodiment 4.
- the sub-imaging unit is used only for detecting the amount of camera shake.
- the sub-imaging element may be used for obtaining the optical condition of the subject that is captured by the main imaging unit.
- the optical conditions include, for example, the brightness or light quantity of the subject, the color temperature of the illumination that illuminates the subject, the image power output by the image sensor, and the TTL distance measurement that measures the distance to the subject.
- the focal position of the secondary optical system is movable in the same manner as the focal position of the primary optical system, or light passing through the primary optical system is supplied to the secondary imaging device. Therefore, the imaging state on the sub-imaging device needs to change due to the change in the focal position of the main optical system.
- the lens of the secondary optical system is moved so that the focus position is 20 cm, 30 cm, 50 cm, lm, 3 m, and shooting is performed at each focus position.
- the lens of the main imaging element is moved to the focus position where the highest contrast image was obtained. Since the sub-imaging device has fewer pixels than the main image sensor, shooting at each focus position can be performed faster than TTL distance measurement using the main image sensor. Time to start can be shortened.
- a black and white distribution is obtained from one image captured with the sub image sensor, and the distribution is either white or black.
- the pixel gain of the main image sensor is selected so as not to be biased.
- the sub-imaging device can shoot at a higher speed with fewer pixels than the main imaging device, so the time required to start exposure for shooting the output image can be shortened.
- a part with a color filter is provided in a part of the sub-imaging device, and the part is used as a sensor for measuring the color temperature. It is desirable that more light be introduced into the color temperature measurement sensor.
- the camera cannot determine whether the light is actually yellow or the subject is yellow, and the wrong color temperature. Correction may be performed.
- the internal CPU is used to distinguish whether the subject is yellow when the light is yellow! As much as possible! A camera installed on a mobile phone is more likely to make a false positive Become.
- the color temperature measurement sensor should not be provided as part of the sub-imaging device as described above, but should be provided separately.
- optical conditions described above can be used in combination with camera shake detection, or may be used only by obtaining optical conditions.
- the imaging device according to the present invention can be used by being mounted on a digital still camera or a mobile phone with a camera function.
Abstract
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2004/015478 WO2006043315A1 (ja) | 2004-10-20 | 2004-10-20 | 撮像装置および撮像装置を備えた携帯機器 |
JP2006542133A JPWO2006043315A1 (ja) | 2004-10-20 | 2004-10-20 | 撮像装置および撮像装置を備えた携帯機器 |
Applications Claiming Priority (1)
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PCT/JP2004/015478 WO2006043315A1 (ja) | 2004-10-20 | 2004-10-20 | 撮像装置および撮像装置を備えた携帯機器 |
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008309883A (ja) * | 2007-06-12 | 2008-12-25 | Nikon Corp | デジタルカメラ |
JP2010193324A (ja) * | 2009-02-20 | 2010-09-02 | Casio Computer Co Ltd | カメラ装置、及びその撮影方法とプログラム |
US7817187B2 (en) * | 2007-06-27 | 2010-10-19 | Aptina Imaging Corporation | Image blur correction using a secondary camera |
US7859568B2 (en) * | 2003-02-25 | 2010-12-28 | Panasonic Corporation | Image capturing processing method and system for performing roll correction |
CN102065221A (zh) * | 2009-11-11 | 2011-05-18 | 美商豪威科技股份有限公司 | 具抖动补偿的图像传感器 |
JP2013110754A (ja) * | 2013-01-17 | 2013-06-06 | Casio Comput Co Ltd | カメラ装置、及びその撮影方法とプログラム |
JP2019526950A (ja) * | 2016-06-08 | 2019-09-19 | アマゾン テクノロジーズ インコーポレイテッド | マルチセンサ画像手ぶれ補正技術 |
Citations (2)
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JPH03200229A (ja) * | 1989-12-28 | 1991-09-02 | Olympus Optical Co Ltd | カメラ装置 |
JPH03201877A (ja) * | 1989-12-28 | 1991-09-03 | Olympus Optical Co Ltd | 電子カメラ装置 |
-
2004
- 2004-10-20 JP JP2006542133A patent/JPWO2006043315A1/ja not_active Withdrawn
- 2004-10-20 WO PCT/JP2004/015478 patent/WO2006043315A1/ja active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH03200229A (ja) * | 1989-12-28 | 1991-09-02 | Olympus Optical Co Ltd | カメラ装置 |
JPH03201877A (ja) * | 1989-12-28 | 1991-09-03 | Olympus Optical Co Ltd | 電子カメラ装置 |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7859568B2 (en) * | 2003-02-25 | 2010-12-28 | Panasonic Corporation | Image capturing processing method and system for performing roll correction |
JP2008309883A (ja) * | 2007-06-12 | 2008-12-25 | Nikon Corp | デジタルカメラ |
US8284295B2 (en) | 2007-06-12 | 2012-10-09 | Nikon Corporation | Digital camera |
US7817187B2 (en) * | 2007-06-27 | 2010-10-19 | Aptina Imaging Corporation | Image blur correction using a secondary camera |
JP2010193324A (ja) * | 2009-02-20 | 2010-09-02 | Casio Computer Co Ltd | カメラ装置、及びその撮影方法とプログラム |
CN102065221A (zh) * | 2009-11-11 | 2011-05-18 | 美商豪威科技股份有限公司 | 具抖动补偿的图像传感器 |
EP2323376A1 (en) * | 2009-11-11 | 2011-05-18 | Omnivision Technologies, Inc. | Image sensor with shaking compensation |
JP2013110754A (ja) * | 2013-01-17 | 2013-06-06 | Casio Comput Co Ltd | カメラ装置、及びその撮影方法とプログラム |
JP2019526950A (ja) * | 2016-06-08 | 2019-09-19 | アマゾン テクノロジーズ インコーポレイテッド | マルチセンサ画像手ぶれ補正技術 |
US10594937B2 (en) | 2016-06-08 | 2020-03-17 | Amazon Technologies, Inc. | Multi-sensor image stabilization techniques |
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