JP2006319852A - Imaging apparatus - Google Patents

Imaging apparatus Download PDF

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JP2006319852A
JP2006319852A JP2005142503A JP2005142503A JP2006319852A JP 2006319852 A JP2006319852 A JP 2006319852A JP 2005142503 A JP2005142503 A JP 2005142503A JP 2005142503 A JP2005142503 A JP 2005142503A JP 2006319852 A JP2006319852 A JP 2006319852A
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angular velocity
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gyro
still image
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Toshio Ihi
敏男 井比
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Canon Inc
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Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that it is difficult to perform appropriate blurring correction which corresponds to each of a still image mode and a moving video mode in a configuration using a gyroscope sensor which is used at present and set in low sensitivity. <P>SOLUTION: Processing is changed according to a still image mode and a moving video mode, and correction processing according to a temperature variation is also performed by distinct processing in each mode. At the still image mode, blurring correction is performed which reduces fluctuation by noise. At the moving video mode, blurring correction is performed with a sufficient responsiveness. As a result, blurring correction is enabled suitable for each of the still image mode and the moving video mode. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は手ぶれ補正をするための撮像装置に関するものである。   The present invention relates to an imaging apparatus for correcting camera shake.

従来手ぶれ補正機能をもつ撮像装置では、ぶれ量検知にジャイロセンサ（角速度センサ）がよく用いられる。このジャイロセンサは圧電素子等の振動材を一定周波数で振動させコリオリ力による力を電圧に変換して角速度情報を得る。得られた角速度に対して積分を行い、ぶれ量を算出し、光学的に画角を移動可能なシフトレンズをぶれ量をキャンセルする方向に動かして手ぶれ補正が行われる。   In an imaging apparatus having a conventional camera shake correction function, a gyro sensor (angular velocity sensor) is often used for shake amount detection. This gyro sensor obtains angular velocity information by vibrating a vibrating material such as a piezoelectric element at a constant frequency and converting a force generated by a Coriolis force into a voltage. The obtained angular velocity is integrated to calculate a shake amount, and a camera shake correction is performed by moving a shift lens capable of optically moving the angle of view in a direction to cancel the shake amount.

撮像装置の手ぶれ補正技術に関しては、例えば特許文献１にて開示されているものがある。上記先行技術においては、手ぶれ補正機能を有する撮像装置であるビデオカメラにおいて、補償器手段の周波数特性を温度検出手段の検出信号に応じて最適化することにより、ビデオカメラ本体の周辺温度に拘わらず、手ぶれ補正の周波数特性を広帯域にわたり常に最適化して、補正手段で手ぶれ補正を十分に行う手ぶれ補正装置を提供することがきるというものである。
特開平９−５１４６８号公報 For example, there is a technique disclosed in Patent Document 1 regarding a camera shake correction technique of an imaging apparatus. In the above prior art, in a video camera which is an image pickup apparatus having a camera shake correction function, the frequency characteristic of the compensator means is optimized according to the detection signal of the temperature detecting means, so that regardless of the ambient temperature of the video camera body. Therefore, it is possible to provide a camera shake correction apparatus that can always optimize the frequency characteristics of camera shake correction over a wide band and sufficiently perform camera shake correction by the correction means.
JP 9-51468 A

現状のジャイロの感度設定は応答性（動画性能）とＳ／Ｎ比（低域のゆらぎ）とのバランスを見て設定されているので必ずしも静止画および動画に適しているものではない。しかし、動画撮影と静止画撮影の両者を１台の機器で実現可能な撮像装置において、それぞれの撮影モードに最適な手ぶれ補正を実現することが求められる。   The sensitivity setting of the current gyroscope is set considering the balance between responsiveness (moving image performance) and S / N ratio (low frequency fluctuation), and is not necessarily suitable for still images and moving images. However, in an imaging apparatus capable of realizing both moving image shooting and still image shooting with a single device, it is required to realize an optimum camera shake correction for each shooting mode.

そこで、上記従来例のような動画撮影時における処置のみならず、静止画撮影時の低域のゆらぎを低減するための処置も必要となる。また、温度変化に応じてジャイロ信号を補正するという技術は存在するが、それはジャイロ信号が温度変化に対して一定の出力が得られるように補正するものであり、この技術では、温度変化に応じたジャイロ出力補正後に静止画モードおよび動画モードそれぞれのモードに応じた処理を行う必要が生じる。   Therefore, not only a treatment at the time of moving image shooting as in the above-described conventional example, but also a treatment for reducing low-frequency fluctuations at the time of still image shooting is required. In addition, there is a technique for correcting the gyro signal according to the temperature change, but it corrects the gyro signal so that a constant output is obtained with respect to the temperature change. In this technique, the gyro signal is corrected according to the temperature change. Further, after the gyro output correction, it is necessary to perform processing according to the still image mode and the moving image mode.

このような処理手順では、温度変化に応じた補正処理後に、静止画モードおよび動画モードに応じた処理手段を持つ必要があるため、処理時間の増加、部品点数の増加につながるため、効率的な処理とは言えない。   In such a processing procedure, it is necessary to have processing means corresponding to the still image mode and the moving image mode after the correction processing corresponding to the temperature change, which leads to an increase in processing time and an increase in the number of parts. It's not a process.

そこで、温度補正を行わないジャイロ信号に対して、静止画モードおよび動画モードにおける処理を個別に行うことで、効率の良い処理を行うことができる。しかし、温度変化に応じた補正も個別に行う必要があるという問題がある。   Therefore, efficient processing can be performed by separately performing processing in the still image mode and moving image mode on the gyro signal that is not subjected to temperature correction. However, there is a problem that it is necessary to individually perform correction according to the temperature change.

本発明は、上記課題を考慮し、静止画モードおよび動画モードが選択された際に、それぞれのモードに応じた最適な手ぶれ補正を行う撮像装置を提供することを目的とする。   In view of the above problems, an object of the present invention is to provide an image pickup apparatus that performs optimal camera shake correction according to each mode when a still image mode and a moving image mode are selected.

上述した課題を解決するため、第１の本発明は、振動子を振動子を振動させるその振動子に与えられるコリオリ力を検知し角速度として信号を出力する角速度センサを有する手ぶれ補正機能をもつ撮像装置において、角速度情報の特性を変更する特性変更手段を有し、ジャイロセンサ又は撮像装置周辺温度を検出する温度検出手段を有し、前記角速度処理手段により得られた情報により手ぶれ補正を行う撮像装置であることを特徴とする。   In order to solve the above-described problem, the first aspect of the present invention provides an image stabilization function including an angular velocity sensor that detects a Coriolis force applied to a vibrator and vibrates the vibrator and outputs a signal as an angular velocity. An imaging apparatus having characteristic changing means for changing characteristics of angular velocity information, temperature detecting means for detecting a temperature around the gyro sensor or the imaging apparatus, and performing camera shake correction based on information obtained by the angular velocity processing means It is characterized by being.

また、第２の本発明は、前記の角速度情報の特性変更手段において、周波数特性またはゲイン特性を変更する撮像装置であることを特徴とする。   According to a second aspect of the present invention, the angular velocity information characteristic changing means is an imaging apparatus that changes a frequency characteristic or a gain characteristic.

また、第３の本発明は、前記の角速度情報の特性変更手段において、前記温度検出手段の検出信号に基づき周波数特性またはゲイン特性を変更する撮像装置であることを特徴とする。   According to a third aspect of the present invention, the angular velocity information characteristic changing unit is an imaging device that changes a frequency characteristic or a gain characteristic based on a detection signal of the temperature detecting unit.

また、第４の本発明は、前記の撮像装置において、複数の撮影モードを有し、それぞれの撮影モードに応じて、角速度信号処理を変更することを特徴とする撮像装置であることを特徴とする。   According to a fourth aspect of the present invention, there is provided the imaging apparatus according to the above-described imaging apparatus, wherein the imaging apparatus has a plurality of imaging modes, and the angular velocity signal processing is changed according to each imaging mode. To do.

また、第５の本発明は、前記の撮像装置において、複数の撮影モードは静止画を撮影するための静止画モードと動画を撮影するための動画モードであることを特徴とする撮像装置であることを特徴とする。   According to a fifth aspect of the present invention, in the imaging apparatus, the plurality of shooting modes are a still image mode for shooting a still image and a moving image mode for shooting a moving image. It is characterized by that.

また、第６の本発明は、前記の角速度情報の特性変更手段において、静止画撮影モードの際には前記温度検出手段の検出信号に基づき、ゲイン特性を変更する撮像装置であることを特徴とする。   According to a sixth aspect of the present invention, in the angular velocity information characteristic changing means, the gain characteristic is changed based on a detection signal of the temperature detecting means in a still image shooting mode. To do.

また、第７の本発明は、前記の角速度情報の特性変更手段において、動画撮影モードの際には前記温度検出手段の検出信号に基づき、周波数特性を変更する撮像装置であることを特徴とする。   According to a seventh aspect of the present invention, in the angular velocity information characteristic changing unit, the frequency characteristic is changed based on a detection signal of the temperature detecting unit in the moving image shooting mode. .

本発明では、静止画モードと動画モードで最適な手ぶれ補正を実現するために、高感度に設定したジャイロセンサを利用し、静止画モードおよび動画モードが選択された際に、それぞれ異なる処理を行うと共に温度変化に応じた補正処理においても静止画モードおよび動画モードで異なる処理を行う。   In the present invention, in order to realize the optimum camera shake correction in the still image mode and the moving image mode, the gyro sensor set to high sensitivity is used, and different processing is performed when the still image mode and the moving image mode are selected. At the same time, different processing is performed in the still image mode and the moving image mode in the correction processing according to the temperature change.

静止画撮影の場合は一般的に撮影者が静止した状態で被写体に狙いを定めるため感度優先で低周波域の揺らぎが少ない補正が求められる。静止画撮影時には、周辺温度に応じてジャイロ信号出力が一定となるよう補正処理を行うことで、上記の要求を満たす手ぶれ補正が可能となる。また、動画撮影では撮影者、被写体とも動作している場合が多いのでより応答性の高い補正が求められる。動画撮影時には周辺温度に応じて特性を変更したフィルタを利用し、ジャイロセンサの周波数特性を変更することで、上記の要求を満たす手ぶれ補正が可能となる。   In the case of still image shooting, in general, since a photographer aims at a subject while still, correction with low priority in sensitivity and low fluctuation is required. At the time of still image shooting, by performing correction processing so that the gyro signal output becomes constant according to the ambient temperature, it is possible to perform camera shake correction that satisfies the above requirements. Further, in moving image shooting, both the photographer and the subject are often operating, so correction with higher responsiveness is required. By using a filter whose characteristics are changed according to the ambient temperature during moving image shooting and changing the frequency characteristics of the gyro sensor, it is possible to perform camera shake correction satisfying the above requirements.

以上説明したように、本発明によれば、静止画モード、動画モードにおいてそれぞれに適した処理を行うと共に、撮像装置の周辺温度に応じた補正処理を行うことで、それぞれの撮影モードに応じた最適な手ぶれ補正を効率的に行うことが可能である。   As described above, according to the present invention, the processing suitable for each of the still image mode and the moving image mode is performed, and the correction processing according to the ambient temperature of the imaging device is performed, so that the corresponding to each shooting mode is performed. Optimal camera shake correction can be performed efficiently.

以下本発明を実施するための最良の形態を、実施例により詳しく説明する。   Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to examples.

本発明の実施例１について説明する。   Example 1 of the present invention will be described.

図１は本発明のデジタルカメラの全体の構成図で、１０１は変倍を行うズームレンズをもつズームユニット、１０２はズームユニット１０１を駆動制御するズーム駆動制御部、１０３は画角変更を可能とするシフトレンズユニット、１０４はシフトレンズユニット１０３を駆動制御するシフトレンズ駆動制御部、１０６は絞り・シャッタユニット１０５を駆動制御する絞り・シャッタ制御部、１０７はピント調整を行うレンズを持つフォーカスユニット、１０８はフォーカスユニット１０７を駆動制御するフォーカス駆動制御部、１０９は各レンズ群を通ってきた光像を電気信号に変換する撮像部、１１０は撮像部１０９からの電気信号を映像信号に変換処理する撮像信号処理部、１１１は撮像信号処理部１１０からの映像信号を用途に応じて加工する映像信号処理部、１１２は映像信号処理部１１１からの信号を必要に応じて表示する表示部、１１３はシステム全体で使用する用途に応じた電源を供給する電源部、１１４は外部との通信及び映像信号を入出力する外部入出力部、１１５はシステムを操作するための操作部、１１６は映像情報など様々なデータを記憶する記憶部、１１７はシステム全体を制御する制御部である。   FIG. 1 is an overall configuration diagram of a digital camera according to the present invention. 101 is a zoom unit having a zoom lens for zooming, 102 is a zoom drive control unit for driving and controlling the zoom unit 101, and 103 is capable of changing the angle of view. A shift lens unit 104, a shift lens drive control unit 104 for driving and controlling the shift lens unit 103, 106 an aperture / shutter control unit for driving and controlling the aperture / shutter unit 105, and a focus unit 107 having a lens for performing focus adjustment, Reference numeral 108 denotes a focus drive control unit that drives and controls the focus unit 107, reference numeral 109 denotes an imaging unit that converts a light image that has passed through each lens group into an electrical signal, and reference numeral 110 denotes an electrical signal from the imaging unit 109 that converts the electrical signal into a video signal. The imaging signal processing unit 111 is adapted to use the video signal from the imaging signal processing unit 110 according to the application. A video signal processing unit to be processed, 112 is a display unit that displays a signal from the video signal processing unit 111 as necessary, 113 is a power source unit that supplies power according to the use used in the entire system, and 114 is an external unit An external input / output unit that inputs / outputs communication and video signals, 115 is an operation unit for operating the system, 116 is a storage unit that stores various data such as video information, and 117 is a control unit that controls the entire system.

本発明のデジタルカメラ全体のシステムについて説明する。   A system of the entire digital camera of the present invention will be described.

操作部１１５よりズーム変倍の指示があると制御部１１７は指示されたズーム位置に移動するとともに、操作部１０９から各信号処理部（１１０、１１１）にて処理された画像情報をもとにフォーカスレンズ１０７を駆動しピント調整する。操作部１１５よりさらに撮影の指示があれば画像情報よりピント調整するとともに絞り・シャッタ１０５により適正な露光量に設定して撮像部１０９に光像を露光し得られた画像情報を記憶部１１６に記憶する。このとき操作部１１５より防振オンの指示があれば制御部１１７はＩＳ駆動制御部１０４に防振を指示して防振動作を防振オフに指示がなされるまで行う。また静止画モードと動画モードを選択可能でそれぞれのモードにおいて各アクチュエータの動作条件も変更可能としている。   When there is an instruction for zooming magnification from the operation unit 115, the control unit 117 moves to the instructed zoom position, and based on image information processed by the signal processing units (110, 111) from the operation unit 109. The focus lens 107 is driven to adjust the focus. If there is a further shooting instruction from the operation unit 115, focus adjustment is performed based on the image information, and an appropriate exposure amount is set by the aperture / shutter 105, and image information obtained by exposing the optical image to the imaging unit 109 is stored in the storage unit 116. Remember. At this time, if there is an instruction to turn on image stabilization from the operation unit 115, the control unit 117 instructs the IS drive control unit 104 to perform image stabilization until an instruction to turn off image stabilization is issued. In addition, the still image mode and the moving image mode can be selected, and the operating conditions of each actuator can be changed in each mode.

図２はシフトレンズ駆動制御部１０４のブロック図で、２０１は状況に応じて防振制御、シフトレンズ位置制御を行う防振制御部、２０２はデジタルカメラ正位置で垂直方向（ピッチ方向）の振動を検知するジャイロ部、２０３はデジタルカメラ正位置で水平方向（ヨー方向）の振動を検知するジャイロ部、２０４はシフトレンズユニットのピッチ方向の位置を検知するホール素子、２０５はシフトレンズユニットのヨー方向の位置を検知するホール素子、２０６、２０７はホール素子２０４、２０５からの信号を増幅するアンプ、２０８、２０９は制御部２０１より指示された位置信号とアンプ２０６、２０７からのシフトレンズ位置信号とを比較する比較器、２１０、２１１は比較器２０８、２０９からの信号をもとにシフトレンズユニット１０３を駆動するドライブ部、２１２はピッチ方向ジャイロ部（２０２）、ヨー方向ジャイロ部（２０３）周辺の温度を検知するためのサーミスタである。   FIG. 2 is a block diagram of the shift lens drive control unit 104. 201 is an image stabilization control unit that performs image stabilization control and shift lens position control according to the situation. 203 is a gyro part for detecting vibration in the horizontal direction (yaw direction) at the digital camera normal position, 204 is a hall element for detecting the position of the shift lens unit in the pitch direction, and 205 is the yaw of the shift lens unit. Hall elements that detect the position in the direction, amplifiers 206 and 207 that amplify signals from the hall elements 204 and 205, and 208 and 209, position signals instructed by the control unit 201 and shift lens position signals from the amplifiers 206 and 207, respectively. Comparators 210 and 211 compare the shift lens unit with the signals from the comparators 208 and 209. Drive unit for driving the door 103, 212 is a pitch gyro unit (202), the yaw gyro (203) is a thermistor for detecting the temperature of the surroundings.

次にシフトレンズ位置制御について説明する。   Next, shift lens position control will be described.

シフトレンズ位置制御はジャイロからのピッチ方向、ヨー方向の振動情報に基づいて、それぞれの方向にシフトレンズユニット１０３を駆動させることでなされ、そのシフトレンズユニット１０３の位置制御はシフトレンズユニット１０３に付けられた磁石をホール素子２０４、２０５で検知し、その位置信号を防振制御部２０１からの位置指令信号に合わせるようなフィードバック位置制御となっている。   Shift lens position control is performed by driving the shift lens unit 103 in each direction based on vibration information in the pitch direction and yaw direction from the gyro, and the position control of the shift lens unit 103 is attached to the shift lens unit 103. The detected position is detected by the hall elements 204 and 205, and feedback position control is performed so that the position signal is matched with the position command signal from the image stabilization control unit 201.

防振動作はピッチ方向、ヨー方向ジャイロ２０２、２０３からの手ぶれ情報を元に画角が変化しないようにその振動方向とは逆の方向に移動するよう防振制御部２０１から位置指令信号によりシフトレンズユニット１０３を移動させることで行われる。   The image stabilization operation is shifted by the position command signal from the image stabilization control unit 201 so as to move in the opposite direction so that the angle of view does not change based on the shake information from the pitch direction and yaw direction gyros 202 and 203. This is done by moving the lens unit 103.

図３はジャイロ内部のブロック図であり、３０１は振動子、３０２は振動子の振動周波数を決定する発振器、３０３は振動子を振動させる振動子駆動部、３０４は振動子駆動部からの駆動信号により振動子を振動させる振動用圧電素子、３０５はコリオリ力を検知する検知用圧電素子、３０６は圧電素子３０５からの信号を増幅等の処理し角速度信号として出力するためのジャイロ信号処理部である。   FIG. 3 is a block diagram inside the gyro, where 301 is a vibrator, 302 is an oscillator that determines the vibration frequency of the vibrator, 303 is a vibrator drive unit that vibrates the vibrator, and 304 is a drive signal from the vibrator drive unit. A piezoelectric element for vibration that vibrates the vibrator by means of the above, 305 is a piezoelectric element for detection that detects Coriolis force, and 306 is a gyro signal processing unit for processing the signal from the piezoelectric element 305 such as amplification and outputting it as an angular velocity signal. .

振動子３０１の振動量が大きいほど検知用圧電素子３０５からの出力は大きくなるためその振動周波数は振動子３０１の共振周波数付近で振動させられる。ただし、振動周波数が共振周波数に近いほど応答性が悪くなるという特性をもっている。本発明では振動周波数が共振周波数に近い周波数に設定された高感度ジャイロを用意する。   As the vibration amount of the vibrator 301 increases, the output from the detecting piezoelectric element 305 increases, so that the vibration frequency is vibrated near the resonance frequency of the vibrator 301. However, there is a characteristic that the response becomes worse as the vibration frequency is closer to the resonance frequency. In the present invention, a high-sensitivity gyro in which the vibration frequency is set to a frequency close to the resonance frequency is prepared.

図４は防振制御のブロック図であり、４０１はジャイロ部２０２または２０３からのジャイロ信号をデジタル信号に変換するＡＤ変換器、４０２はＤＣ成分をカットするカットオフ周波数変更可能なＨＰＦ、４０３はゲイン変更可能な信号を増幅するアンプ、４０４は動画モード選択時に利用するカットオフ周波数変更可能なＨＰＦ、４０５は位相が変更可能なフェーズリードフィルタ（以下ＰＬＦ）、４０６はカットオフ周波数変更可能なＨＰＦ、４０７は角速度信号を角度信号に変換するためのＬＰＦ、４０８はデジタル信号をアナログ信号に変換するＤＡ変換器、４０９はサーミスタからの信号をデジタル信号に変換するＡＤ変換器、４１０はＨＰＦ４０２からの信号を処理し、各フィルタの状態を制御するジャイロ信号処理部、４１１は静止画モードか動画モードかに応じた制御信号Ｓ４０１によって切り替わるスイッチである。ジャイロ部２０２または２０３からのジャイロ信号はＡＤ変換器４０１でデジタル信号に変換され、ＨＰＦ４０２で所定のカットオフ周波数でＤＣ成分をカットされアンプ４０３で適正なゲインに設定されジャイロ信号処理部４１０に入力される。ジャイロ信号処理部４１０で処理された信号は動画モードの時は制御信号Ｓ４０１を受け取ったスイッチ４１１によりＨＰＦ４０４を通るよう設定され、静止画モードの時は制御信号Ｓ４０１を受け取ったスイッチ４１１によりＨＰＦ４０４の処理が行われないように設定される。よって、動画モードの時はＨＰＦ４０４で適正なカットオフ周波数のフィルタで処理された後、ＰＬＦ４０５に入力され、静止画モードの時はＰＬＦ４０５に直接入力される。ＰＬＦ４０５に入力された信号は所定の位相に調整され、ＨＰＦ４０６で適正なカットオフ周波数のフィルタで処理され、ＬＰＦ４０７でカメラの振動（手ぶれ）を補正するためのシフトレンズユニット１０３の移動量を角速度信号から角度信号に変換してＤＡ変換器４０８でアナログ信号に変換し補正位置信号として比較器２０８または２０９に入力される。   4 is a block diagram of image stabilization control. 401 is an AD converter that converts a gyro signal from the gyro section 202 or 203 into a digital signal, 402 is an HPF that can change a cutoff frequency for cutting a DC component, and 403 An amplifier that amplifies a signal whose gain can be changed, 404 is an HPF that can change a cutoff frequency used when a moving image mode is selected, 405 is a phase lead filter (hereinafter referred to as PLF) that can change a phase, and 406 is an HPF that can change a cutoff frequency. 407 is an LPF for converting an angular velocity signal into an angle signal, 408 is a DA converter that converts a digital signal into an analog signal, 409 is an AD converter that converts a signal from a thermistor into a digital signal, and 410 is an output from the HPF 402. A gyro signal processing unit that processes signals and controls the state of each filter; 41 A switch switched by the control signal S401 in accordance with whether a still image mode or movie mode. The gyro signal from the gyro unit 202 or 203 is converted into a digital signal by the AD converter 401, the DC component is cut at a predetermined cutoff frequency by the HPF 402, set to an appropriate gain by the amplifier 403, and input to the gyro signal processing unit 410. Is done. The signal processed by the gyro signal processing unit 410 is set to pass through the HPF 404 by the switch 411 that has received the control signal S401 in the moving image mode, and is processed by the switch 411 that has received the control signal S401 in the still image mode. Is set not to be performed. Therefore, in the moving image mode, the filter is processed by the HPF 404 with a filter having an appropriate cutoff frequency, and then input to the PLF 405. In the still image mode, the signal is directly input to the PLF 405. The signal input to the PLF 405 is adjusted to a predetermined phase, processed by a filter having an appropriate cutoff frequency by the HPF 406, and the amount of movement of the shift lens unit 103 for correcting camera vibration (camera shake) by the LPF 407 is an angular velocity signal. Is converted into an angle signal, converted into an analog signal by the DA converter 408, and input to the comparator 208 or 209 as a corrected position signal.

次にジャイロ信号処理部４１０での制御を説明する。図５はそのフローチャートである。ジャイロ信号処理部４１０に入力されたジャイロ信号は動画モードか静止画モードかの判断を行う。動画モードが選択されていたなら、制御信号Ｓ４０１によりスイッチ４１１を操作し、ＨＰＦ４０４の処理を行うように設定し、ジャイロ信号はＨＰＦ４０４に入力される。静止画モードが選択されていたなら、制御信号Ｓ４０１によりスイッチ４１１を操作し、ＨＰＦ４０４の処理を行わないように設定し、ジャイロ信号は温度補正処理によりジャイロの温度特性を加味した補正を行われ、補正された信号はＰＬＦ４０５に入力される。   Next, control in the gyro signal processing unit 410 will be described. FIG. 5 is a flowchart thereof. The gyro signal input to the gyro signal processing unit 410 determines whether it is a moving image mode or a still image mode. If the moving image mode has been selected, the switch 411 is operated by the control signal S 401 so that the HPF 404 is processed, and the gyro signal is input to the HPF 404. If the still image mode has been selected, the switch 411 is operated by the control signal S401 and the HPF 404 is set not to be processed. The gyro signal is corrected in consideration of the temperature characteristic of the gyro by the temperature correction process. The corrected signal is input to the PLF 405.

次に静止画モード選択時における温度補正処理５０６について説明する。図６は温度に対するジャイロの出力特性を示したものである。温度検出部２１２からの温度信号をＡＤ変換器４０９でデジタル信号に変換した信号をデータＴとして取り込み、すでに入力されたジャイロ信号に対して温度補正する関数Ｋ（Ｔ）を掛けることで補正を行う。   Next, the temperature correction processing 506 when the still image mode is selected will be described. FIG. 6 shows the output characteristics of the gyro with respect to temperature. A signal obtained by converting the temperature signal from the temperature detection unit 212 into a digital signal by the AD converter 409 is fetched as data T, and correction is performed by multiplying the already input gyro signal by a function K (T) for temperature correction. .

図７は温度補正処理５０６通過後のジャイロ出力特性である。静止画モードにおいてジャイロ出力は低域側でゲインが大きくＳ／Ｎ比も大きくなりノイズ的にも有利であるが高域まで特性が伸びていないので応答性が悪い。ただし、静止画の場合は高域の動作が少ない状態となるので、これでも十分な特性となっている。   FIG. 7 shows the gyro output characteristics after passing through the temperature correction process 506. In the still image mode, the gyro output has a large gain on the low frequency side and a large S / N ratio, which is advantageous in terms of noise. However, since the characteristics do not extend to the high frequency range, the response is poor. However, in the case of a still image, there are few high-frequency operations, and this still has sufficient characteristics.

次に動画モード選択時におけるジャイロ信号処理部４１０からの出力信号が入力されるＨＰＦ４０４について説明する。ＨＰＦ４０４のカットオフ周波数は、ジャイロ信号処理部４１０で、温度検出部２１２からの温度信号をＡＤ変換器４０９でデジタル信号に変換した信号をデータＴとして取り込み、データＴとジャイロからの出力信号の周波数特性を基に決定される。   Next, the HPF 404 to which the output signal from the gyro signal processing unit 410 when the moving image mode is selected will be described. The cut-off frequency of the HPF 404 is obtained by taking the signal obtained by converting the temperature signal from the temperature detection unit 212 into a digital signal by the AD converter 409 as data T in the gyro signal processing unit 410, and the frequency of the data T and the output signal from the gyro. Determined based on characteristics.

図８は温度に対するジャイロからの出力信号の周波数特性を示した図である。図８のようにジャイロからの出力信号の周波数特性は温度上昇に伴いゲインが減少し、特性が高域まで伸びるという特徴をもっている。ｆ１、ｆ２、ｆ３はそれぞれ低温、常温、高温条件下でジャイロゲインが減少を始める周波数である。   FIG. 8 is a diagram showing frequency characteristics of an output signal from the gyro with respect to temperature. As shown in FIG. 8, the frequency characteristic of the output signal from the gyro has a characteristic that the gain decreases as the temperature rises, and the characteristic extends to a high frequency range. f1, f2, and f3 are frequencies at which the gyro gain starts decreasing under low temperature, normal temperature, and high temperature conditions, respectively.

図９はＨＰＦ４０４のフィルタの周波数特性を示した図である。ＨＰＦ４０４はジャイロ信号処理部４１０の制御によりカットオフ周波数が可変であり、図９のようにジャイロからの出力信号の周波数特性のジャイロゲインが減少を始める周波数ｆ１、ｆ２、ｆ３に応じて低域側のカットオフ周波数がジャイロ信号処理部４１０で決定されている。高域側のカットオフ周波数ｆ４は適切な値に固定され、ｆ４付近まで特性を伸ばすことができる。   FIG. 9 is a diagram showing the frequency characteristics of the HPF 404 filter. The HPF 404 has a variable cutoff frequency under the control of the gyro signal processing unit 410, and the low frequency side according to the frequencies f1, f2, and f3 at which the gyro gain of the frequency characteristic of the output signal from the gyro starts to decrease as shown in FIG. Is determined by the gyro signal processing unit 410. The cutoff frequency f4 on the high frequency side is fixed to an appropriate value, and the characteristics can be extended to near f4.

図１０はＨＰＦ４０４通過後のジャイロ出力特性である。上記ように最適なＨＰＦ４０４のカットオフ周波数を設定することにより、周囲の温度に関わらず動画モードにおいてジャイロ出力は低域側でゲインが小さくＳ／Ｎ比も小さくなり、ノイズ的にも不利であるが高域まで特性が伸びているので、応答性が良い周波数特性とすることが可能である。   FIG. 10 shows the gyro output characteristics after passing through the HPF 404. By setting the optimum cutoff frequency of HPF 404 as described above, the gyro output has a small gain on the low frequency side and a low S / N ratio in the moving image mode regardless of the ambient temperature, which is disadvantageous in terms of noise. However, since the characteristics extend to a high frequency range, it is possible to obtain frequency characteristics with good responsiveness.

上記のように静止画モードと動画モードに応じて処理を変更し、温度変化に応じた補正処理もそれぞれのモードにより異なる処理を行うことで、静止画モードのときにはノイズによる揺らぎを低減した手ぶれ補正を行い、動画モードのときには応答性の良い手ぶれ補正を行い、静止画モードと動画モードそれぞれのモードに適した手ぶれ補正を行うことが可能となる。   As described above, the processing is changed according to the still image mode and the moving image mode, and the correction processing according to the temperature change is also performed depending on each mode, so that camera shake correction that reduces noise fluctuations in the still image mode is performed. In the moving image mode, it is possible to perform camera shake correction with good responsiveness, and to perform camera shake correction suitable for each of the still image mode and the moving image mode.

本発明のデジタルカメラのシステムの構成図Configuration diagram of a digital camera system of the present invention 本発明のシフトレンズ駆動制御部のブロック図Block diagram of shift lens drive control unit of the present invention 実施例のジャイロ内部構成図Gyro internal configuration diagram of the embodiment 実施例の防振制御のブロック図Block diagram of image stabilization control in the embodiment 実施例の防振制御のフローチャートFlowchart of image stabilization control in the embodiment 実施例のジャイロ部出力の温度特性図Temperature characteristic diagram of output of gyro section of the embodiment 実施例の温度補償後のジャイロ部出力の周波数特性図Frequency characteristic diagram of gyroscope output after temperature compensation in the embodiment 実施例の温度によるジャイロ部出力の周波数特性図Frequency characteristic diagram of gyro output according to temperature in the embodiment 実施例のＨＰＦの周波数特性図Example of HPF frequency characteristics 実施例のＨＰＦ通過後のジャイロ部出力の周波数特性図Frequency characteristic diagram of output of gyro part after passing through HPF of embodiment

符号の説明Explanation of symbols

１０３ シフトレンズユニット
１０４ シフトレンズ駆動制御部
１１７ 制御部
２０１ 防振制御部
２０２ ピッチ方向ジャイロ部
２０３ ヨー方向ジャイロ部
２１２ サーミスタ
４０４ 動画モード選択時のＨＰＦ
４１０ ジャイロ信号処理部 103 Shift lens unit 104 Shift lens drive control unit 117 Control unit 201 Anti-vibration control unit 202 Pitch direction gyro unit 203 Yaw direction gyro unit 212 Thermistor 404 HPF when moving image mode is selected
410 Gyro signal processor

Claims (7)

振動子を振動させるその振動子に与えられるコリオリ力を検知し角速度として信号を出力する角速度センサを有する手ぶれ補正機能をもつ撮像装置において、
角速度情報の特性を変更する特性変更手段を有し、ジャイロセンサ又は撮像装置周辺温度を検出する温度検出手段を有し、前記角速度処理手段により得られた情報により手ぶれ補正を行うことを特徴とする撮像装置。 In an imaging apparatus having a camera shake correction function having an angular velocity sensor that detects a Coriolis force applied to the vibrator to vibrate the vibrator and outputs a signal as an angular velocity,
Characteristic change means for changing the characteristics of angular velocity information, temperature detection means for detecting the ambient temperature of the gyro sensor or the imaging device, and camera shake correction performed by information obtained by the angular velocity processing means Imaging device. 請求項１記載の角速度情報の特性変更手段において、周波数特性またはゲイン特性を変更することを特徴とする撮像装置。   3. The angular velocity information characteristic changing means according to claim 1, wherein the frequency characteristic or gain characteristic is changed. 請求項１記載の角速度情報の特性変更手段において、前記温度検出手段の検出信号に基づき周波数特性またはゲイン特性を変更することを特徴とする撮像装置。   2. The angular velocity information characteristic changing unit according to claim 1, wherein the frequency characteristic or the gain characteristic is changed based on a detection signal of the temperature detecting unit. 請求項１記載の撮像装置において、複数の撮影モードを有し、それぞれの撮影モードに応じて、角速度信号処理を変更することを特徴とする撮像装置。   The imaging apparatus according to claim 1, wherein the imaging apparatus has a plurality of shooting modes and changes angular velocity signal processing according to each shooting mode. 請求項４記載の撮像装置において、複数の撮影モードは静止画を撮影するための静止画モードと動画を撮影するための動画モードであることを特徴とする撮像装置。   5. The imaging apparatus according to claim 4, wherein the plurality of shooting modes are a still image mode for shooting a still image and a moving image mode for shooting a moving image. 請求項１記載の角速度情報の特性変更手段において、静止画撮影モードの際には前記温度検出手段の検出信号に基づき、ゲイン特性を変更することを特徴とする撮像装置。   The angular velocity information characteristic changing means according to claim 1, wherein the gain characteristic is changed based on a detection signal of the temperature detecting means in the still image shooting mode. 請求項１記載の角速度情報の特性変更手段において、動画撮影モードの際には前記温度検出手段の検出信号に基づき、周波数特性を変更することを特徴とする撮像装置。   The angular velocity information characteristic changing means according to claim 1, wherein the frequency characteristic is changed based on a detection signal of the temperature detecting means in the moving image shooting mode.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010230720A (en) * 2009-03-25 2010-10-14 Canon Inc Image pickup device, control method and program thereof
US8169487B2 (en) 2008-11-04 2012-05-01 Canon Kabushiki Kaisha Image-shake correction apparatus and imaging apparatus
CN108810323A (en) * 2018-05-31 2018-11-13 维沃移动通信有限公司 A kind of image processing method and terminal device
CN112911110A (en) * 2021-01-21 2021-06-04 维沃移动通信有限公司 Optical anti-shake control method and device for camera module and electronic equipment

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8169487B2 (en) 2008-11-04 2012-05-01 Canon Kabushiki Kaisha Image-shake correction apparatus and imaging apparatus
JP2010230720A (en) * 2009-03-25 2010-10-14 Canon Inc Image pickup device, control method and program thereof
CN108810323A (en) * 2018-05-31 2018-11-13 维沃移动通信有限公司 A kind of image processing method and terminal device
CN112911110A (en) * 2021-01-21 2021-06-04 维沃移动通信有限公司 Optical anti-shake control method and device for camera module and electronic equipment

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