JP2004128935A - Photographing device with target object enhancement function - Google Patents

Photographing device with target object enhancement function Download PDF

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Publication number
JP2004128935A
JP2004128935A JP2002290915A JP2002290915A JP2004128935A JP 2004128935 A JP2004128935 A JP 2004128935A JP 2002290915 A JP2002290915 A JP 2002290915A JP 2002290915 A JP2002290915 A JP 2002290915A JP 2004128935 A JP2004128935 A JP 2004128935A
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Japan
Prior art keywords
circuit
signal
output
target object
target subject
Prior art date
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Pending
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JP2002290915A
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Japanese (ja)
Inventor
Junji Yamaguchi
山口 淳史
Shoji Nishikawa
西川 彰治
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Priority to JP2002290915A priority Critical patent/JP2004128935A/en
Publication of JP2004128935A publication Critical patent/JP2004128935A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem wherein photographing may be unsuccessful because a target object on a viewfinder is lost in many cases, when a photographer should operate a photographing device so as to follow the target object on the viewfinder during photographing by the photographing device such as a video camera. <P>SOLUTION: The photographing device comprises a target object discriminating circuit for discriminating a target object from video signals to output a discrimination signal and a target object enhancement circuit for performing enhancement processing so as to ensure easy target object recognition. According to the output of the target object discriminating circuit, the enhancement processing for easy target object recognition is conducted on a target object video image portion only for video signals outputted on a viewfinder. According to the operation, missing of the target object can be prevented. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、ビデオカメラ、VTR一体型カメラなどに用いられ、ビューファインダーなどで撮像する映像をモニターする場合の映像信号に特殊な処理を行ない、目標被写体をわかりやすくする機能を有した撮像装置に関する。
【0002】
【従来の技術】
従来、撮像装置においては、ビューファインダーなどに本線出力とは別にモニター用の映像を出力しており、撮影者はビューファインダーをみながら撮像装置の向きを常に撮影したい目標被写体に向け撮影を行なっている。
【0003】
【特許文献1】
実用新案登録公報第2587187号(ビューファインダーを有するカメラ)
【0004】
【発明が解決しようとする課題】
この従来の撮像装置において、撮影したい目標被写体が移動する場合や類似した被写体が複数ある場合、撮影者がビューファインダー上の目標被写体を追従するように撮影装置を操作する必要があるが、この際、ビューファインダー上の目標被写体を見失うことが多く、撮影に失敗する場合がある。
【0005】
例えば公園などで自分の子供を撮影する場合など、他の子供が同時にビューファインダー上に存在するし、かつ、自分の子供も動き回るため、少し目を離すとビューファインダー上でどこに自分の子供がいるか見失いがちである。
【0006】
本発明は、以上の点を考慮してなされたもので、目標とする被写体映像を強調してビューファインダー上に出力することで、目標被写体を容易に認識できる撮像装置を実現することを目的とする。
【0007】
また本発明は、目標の被写体のみカラーで表示する場合に、その境界部分がより自然に表示されることを目的とする。
【0008】
【課題を解決するための手段】
この課題を解決するために、本発明は、映像信号より目標の被写体を判別し、判別信号を出力する目標被写体判別回路と、目標被写体の認識が容易になるような強調処理を行なう目標被写体強調回路とを備え、ビューファインダーに出力する映像信号にのみ前記目標被写体判別回路の出力に従って、目標被写体映像部分に認識が容易になる処理を行なうものである。
【0009】
また、前記目標被写体判別回路は、映像信号より任意の独立した2つの色信号を生成する色信号生成回路と、前記生成された2つの色信号と予め設定された第1、第2の設定値との差分信号を算出する第1、第2の減算器と、前記第1、第2の減算器の出力の絶対値を算出する絶対値回路と、前記絶対値回路出力のゲインを調整する第1、第2の乗算器と、前記第1の乗算器の出力と予め設定された第3の設定値との差信号を算出する第3減算器と、前記第3の減算器出力と前記第2の乗算器との差信号を算出する第4の減算器と、前記第4の減算器出力の負の値を零に置き換える負クリップ回路とを備え、前記負クリップ回路の出力は、零以外の値が特定色領域を示し、かつ、特定色らしさの度合いを示す信号として、前記第1、第2の設定値と前記2つの色信号との差分に応じた零ないし第3の設定値の値をとり、この出力信号を目標被写体を判別する信号として用いるものである。
【0010】
また、前記目標被写体強調回路は、色信号制限回路を備え、目標被写体判別信号に従って、目標被写体以外の色信号を制限するものである。
【0011】
【発明の実施の形態】
以下、本発明の実施の形態について、図1から図3を用いて説明する。
【0012】
(実施の形態1)
図1は本発明の目標被写体強調機能付き撮像装置の実施の形態1の構成を示す。また、図2は本発明の目標被写体強調機能付き撮像装置の実施の形態1のより詳細な構成を示す。図2において、1はレンズ、プリズム、CCDなどの撮像素子などで構成され、色光をR,G,Bに分割しそれぞれに設けられた撮像素子によりR,G,Bの3原色に対応してR,G,Bの3原色信号を得る撮像部、2は撮像部1からのRGB3原色信号を増幅する増幅器、3は増幅器2からの出力信号にガンマ処理、マトリクス変換処理などを行なうプロセス回路、4はRGB3原色信号から目標の被写体を判別し、判別信号を出力する目標被写体判別回路であり、入力されたRGB3原色信号の色成分が予め設定されている目標被写体の色領域かどうかで目標被写体判別信号を発生するものである。すなわち、RGB3原色信号から2つの独立した色信号R−Y,B−Yを生成する色信号生成回路201、および入力された色信号が予め設定されている色領域に入っているかどうかを判定する色判定回路202により構成されている。色判定回路202は、色信号生成回路201で生成された2つの色信号R−Y,B−Yと、あらかじめ設定された第1、第2の色信号設定値との差を算出する第1、第2の減算器101、102と、第1、第2の減算器101、102の出力の絶対値を算出する第1、第2の絶対値回路103,104と、絶対値回路103、104の出力のゲインを調整する第1、第2の乗算器105,106と、第1の乗算器105の出力と第3の設定値との差を算出する第3の減算器107と、第3の減算器107の出力と第2の乗算器106との差を算出する第4の減算器108と、第4の減算器108の出力に負クリップ処理を行なう負クリップ回路109とで構成されている。5は目標被写体の認識が容易になるような強調処理を行なう目標被写体強調回路であり、色信号制限回路203で構成されている。
【0013】
以上のように構成された目標被写体強調機能付き撮像装置について、以下、その動作を説明する。
【0014】
色信号生成回路201において、RGB信号を演算により色信号R−Y,B−Yに変換し、色判定回路202に出力する。色信号R−Yは減算器101により予め設定されているR−Y信号の設定値R−YSetと減算され、次段の絶対値回路103でR−Y信号の設定値R−YSetとの差信号の絶対値を算出する。さらに、乗算器105で係数k1を乗算し出力される。同様に色信号B−Yは、減算器102により予め設定されているB−Y信号の設定値B−YSetと減算され、次段の絶対値回路104でB−Y信号の設定値B−YSetとの差信号の絶対値を算出する。さらに、乗算器106で係数k2を乗算し出力される。乗算器105からの出力信号は第3の設定値RSetから減算器107で減算され、さらに減算器108で乗算器106の出力信号を減算する。負クリップ回路109は減算器108の出力信号の負の値をすべて零に置き換え、目標被写体判別回路の出力信号とする。すなわち、以上説明したように上記色判定回路202では、次式で示される演算により目標被写体かどうかを判別していることになる。
【0015】
【式1】

Figure 2004128935
また、以上説明したように上記色判定回路202では、さらに(1)式により得られた判別信号Pに負クリップ処理を行ない、出力信号としている。
【0016】
図3に上記色判定回路202の入力である色信号R−Y,B−Yと出力である判別信号Pを示す値との関係を示す。すなわち、判別信号Pは0〜RSetの値を取り、0以外が目標被写体領域で、かつその値が目標被写体らしさの度合いを示す。
【0017】
また、第1、第2の設定値R−YSet、B−YSetは、100%目標被写体とする色に対する色信号R−Y,B−Yの値であり、係数k1、k2(k1>0、k2>0)は図3における側面の傾き、第3の設定値RSetは目標被写体度が100%のときの出力信号のレベルを決定するパラメータである。よって、係数k1、k2の大きさによって、目標被写体と判断される領域の大小が決定され、目標被写体領域内での目標被写体度Pは0<P≦RSetの値をとる。
【0018】
以上説明したように、目標被写体判別回路4は、映像信号より目標被写体領域を判別し、その目標被写体度を示す値を目標被写体強調回路5の色信号制限回路203へ出力する。色信号制限回路では、入力された目標被写体度Pのレベルに従って、色信号のレベルを制限する。すなわち、目標被写体度Pが零の場合は、色信号を零に変換して出力する。従って、目標被写体強調回路の出力をビューファインダーへ出力すると、撮影したい目標被写体のみがビューファインダー内でカラー表示され、目標被写体を強調した映像出力を得ることができる。
【0019】
なお、目標被写体判別回路への入力信号はRGB信号である必要はない。また、色信号生成回路で生成される色信号はR−Y,B−Y信号である必要はなく、任意の独立な色信号であれば何でも良い。
【0020】
また、目標被写体かどうかを判別する判定式は(1)式である必要はなく、2つの色信号から目標被写体度が算出できるのならばどの態様でもよい。従って、色判定回路の構成も図2に示すとおりである必要はない。
【0021】
また、目標被写体かどうかを判別する方法は、目標被写体の色信号が予め設定されている色信号領域にはいっているかどうかである必要はなく、輝度信号が予め設定された輝度信号領域にはいっているかどうかであっても良く、また、色信号および輝度信号の両方を用いても良い。
【0022】
【発明の効果】
以上のように本発明によれば、ほとんど白黒のビューファインダー映像中に、目標の被写体のみカラーで表示されるため、非常に認識しやすくなるという顕著な効果が得られる。
【0023】
以上のように本発明によれば、目標被写体判別信号は、ON/OFFではなく、連続した信号のため、目標被写体の境界部で色信号のパタツキが減少し、全体として、自然な目標被写体強調映像が得られる。
【図面の簡単な説明】
【図1】本発明の実施の形態1による目標被写体強調機能付き撮像装置の構成を示すブロック図
【図2】本発明の実施の形態1による目標被写体強調機能付き撮像装置のより詳細な構成を示すブロック図
【図3】同実施の形態1の色判定回路の入力色信号R−Y,B−Yと出力信号との関係を示す模式図
【符号の説明】
1 撮像部
2 増幅器
3 プロセス回路
4 目標被写体判別回路
5 目標被写体強調回路
101,102,107,108 減算器
103,104 絶対値回路
105,106 乗算器
109 負クリップ回路
201 色信号生成回路
202 色判定回路
203 色信号制限回路[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an image pickup apparatus used for a video camera, a VTR integrated camera, and the like, which performs a special process on a video signal when monitoring an image picked up by a viewfinder or the like, and has a function of making a target subject easy to understand. .
[0002]
[Prior art]
Conventionally, in an imaging device, a monitor image is output separately from a main line output to a viewfinder or the like, and a photographer shoots at a target subject who wants to always shoot the orientation of the imaging device while looking at the viewfinder. I have.
[0003]
[Patent Document 1]
Utility model registration publication No. 2587187 (camera with viewfinder)
[0004]
[Problems to be solved by the invention]
In this conventional imaging apparatus, when the target subject to be photographed moves or there are a plurality of similar subjects, the photographer needs to operate the photographing apparatus so as to follow the target subject on the viewfinder. In many cases, the target object on the viewfinder is lost and the photographing fails.
[0005]
For example, when photographing your child in a park, etc., other children are on the viewfinder at the same time and your child moves around, so if you take your eyes a little away, where is your child on the viewfinder They tend to lose sight.
[0006]
The present invention has been made in consideration of the above points, and an object of the present invention is to realize an imaging device that can easily recognize a target subject by emphasizing and outputting a target subject image on a viewfinder. I do.
[0007]
Another object of the present invention is to provide a more natural display of a boundary portion when only a target subject is displayed in color.
[0008]
[Means for Solving the Problems]
In order to solve this problem, the present invention provides a target object discriminating circuit that discriminates a target object from a video signal and outputs a discrimination signal, and a target object emphasizing unit that performs an emphasis process so that the target object can be easily recognized. And a process for facilitating recognition of a target subject video portion only in accordance with an output of the target subject determination circuit only on a video signal output to a viewfinder.
[0009]
The target subject discriminating circuit includes a color signal generating circuit that generates two independent and independent color signals from a video signal, and a first and a second set value that are set in advance by using the generated two color signals. A first and a second subtractor for calculating a difference signal between the first and second subtractors, an absolute value circuit for calculating an absolute value of an output of the first and second subtracters, and a second circuit for adjusting a gain of an output of the absolute value circuit. 1, a second multiplier, a third subtractor for calculating a difference signal between an output of the first multiplier and a preset third set value, an output of the third subtractor, A fourth subtractor for calculating a difference signal from the multiplier of 2 and a negative clip circuit for replacing a negative value of the output of the fourth subtractor with zero, wherein an output of the negative clip circuit is other than zero. Is a signal indicating a specific color area and a signal indicating the degree of specific color likeness. Value as a value of zero to the third set value corresponding to the difference between the two color signals is to use this output signal as a signal to determine the target object.
[0010]
The target subject emphasizing circuit includes a color signal limiting circuit, and limits a color signal other than the target subject according to the target subject determination signal.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
[0012]
(Embodiment 1)
FIG. 1 shows a configuration of an imaging apparatus with a target subject enhancement function according to a first embodiment of the present invention. FIG. 2 shows a more detailed configuration of the imaging apparatus with a target subject enhancement function according to the first embodiment of the present invention. In FIG. 2, reference numeral 1 denotes a lens, a prism, an image sensor such as a CCD, and the like. The color light is divided into R, G, and B, and the image sensors provided respectively correspond to the three primary colors of R, G, and B. An imaging unit that obtains R, G, and B primary color signals; an amplifier that amplifies the RGB three primary color signals from the imaging unit 1; a process circuit that performs gamma processing, matrix conversion processing, and the like on an output signal from the amplifier 2; Reference numeral 4 denotes a target subject discriminating circuit for discriminating a target subject from the RGB three primary color signals and outputting a discrimination signal. It generates a discrimination signal. That is, the color signal generation circuit 201 that generates two independent color signals RY and BY from the RGB three primary color signals, and determines whether the input color signal is in a preset color area. It comprises a color determination circuit 202. The color determination circuit 202 calculates a difference between the two color signals RY and BY generated by the color signal generation circuit 201 and first and second preset color signal setting values. , Second subtractors 101 and 102, first and second absolute circuits 103 and 104 for calculating the absolute values of the outputs of the first and second subtracters 101 and 102, and absolute circuits 103 and 104. First and second multipliers 105 and 106 for adjusting the gain of the output of the first multiplier 105, a third subtractor 107 for calculating the difference between the output of the first multiplier 105 and the third set value, And a negative clip circuit 109 for performing a negative clip process on the output of the fourth subtractor 108. The fourth subtractor 108 calculates the difference between the output of the subtractor 107 and the second multiplier 106. I have. Reference numeral 5 denotes a target subject emphasizing circuit that performs an emphasizing process so that the target subject can be easily recognized, and includes a color signal limiting circuit 203.
[0013]
The operation of the imaging device with the target subject enhancement function configured as described above will be described below.
[0014]
The color signal generation circuit 201 converts the RGB signals into color signals RY and BY by operation and outputs the signals to the color determination circuit 202. The color signal RY is subtracted from a preset value R-YSet of the RY signal by a subtracter 101, and the difference between the color signal RY and the set value R-YSet of the RY signal is calculated by an absolute value circuit 103 in the next stage. Calculate the absolute value of the signal. Further, the multiplier 105 multiplies the coefficient k1 and outputs the result. Similarly, the color signal BY is subtracted from the preset value BY-Set of the BY signal by the subtractor 102, and the absolute-value circuit 104 of the next stage sets the value BY-Set of the BY signal. Calculate the absolute value of the difference signal from. Further, the result is multiplied by a coefficient k2 by the multiplier 106 and output. The output signal from the multiplier 105 is subtracted from the third set value RSet by the subtractor 107, and the output signal of the multiplier 106 is further subtracted by the subtracter 108. The negative clip circuit 109 replaces all the negative values of the output signal of the subtracter 108 with zero, and uses it as the output signal of the target subject determination circuit. That is, as described above, the color determination circuit 202 determines whether or not the subject is the target subject by the calculation represented by the following equation.
[0015]
(Equation 1)
Figure 2004128935
Further, as described above, the color determination circuit 202 further performs a negative clip process on the determination signal P obtained by the equation (1), and outputs the result as an output signal.
[0016]
FIG. 3 shows the relationship between the color signals RY and BY which are the inputs of the color determination circuit 202 and the value indicating the determination signal P which is the output. That is, the discrimination signal P takes a value from 0 to RSet, and a value other than 0 indicates the target subject area, and the value indicates the degree of the likeness of the target subject.
[0017]
The first and second set values R-YSet and B-YSet are the values of the color signals RY and BY for the color as the 100% target object, and the coefficients k1 and k2 (k1> 0, k2> 0) is the inclination of the side surface in FIG. 3, and the third set value RSet is a parameter that determines the level of the output signal when the target subject degree is 100%. Therefore, the size of the area determined to be the target subject is determined by the magnitudes of the coefficients k1 and k2, and the target subject degree P in the target subject area takes a value of 0 <P ≦ RSet.
[0018]
As described above, the target subject discriminating circuit 4 discriminates the target subject area from the video signal, and outputs a value indicating the target subject degree to the color signal limiting circuit 203 of the target subject emphasizing circuit 5. The color signal limiting circuit limits the level of the color signal according to the level of the input target subject degree P. That is, when the target subject degree P is zero, the color signal is converted to zero and output. Therefore, when the output of the target subject emphasizing circuit is output to the viewfinder, only the target subject to be photographed is displayed in color in the viewfinder, and a video output emphasizing the target subject can be obtained.
[0019]
Note that the input signal to the target subject determination circuit does not need to be an RGB signal. The color signals generated by the color signal generation circuit need not be RY and BY signals, but may be any independent color signals.
[0020]
The determination formula for determining whether or not the subject is a target subject need not be Expression (1), but may be any mode as long as the target subject degree can be calculated from two color signals. Therefore, the configuration of the color determination circuit does not need to be as shown in FIG.
[0021]
Also, the method of determining whether or not a target object is present does not need to determine whether or not the color signal of the target object is in a preset color signal area. May be used, and both the color signal and the luminance signal may be used.
[0022]
【The invention's effect】
As described above, according to the present invention, only a target object is displayed in color in almost black and white viewfinder images, so that a remarkable effect that recognition becomes very easy is obtained.
[0023]
As described above, according to the present invention, the target object discrimination signal is not ON / OFF but a continuous signal, so that the color signal fatter is reduced at the boundary of the target object, and as a whole, natural target object emphasis is achieved. Video is obtained.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration of an imaging device with a target subject enhancement function according to a first embodiment of the present invention. FIG. 2 illustrates a more detailed configuration of the imaging device with a target subject enhancement function according to the first embodiment of the invention. FIG. 3 is a schematic diagram illustrating a relationship between input color signals RY and BY and an output signal of the color determination circuit according to the first embodiment.
REFERENCE SIGNS LIST 1 imaging section 2 amplifier 3 process circuit 4 target subject discriminating circuit 5 target subject emphasizing circuits 101, 102, 107, 108 subtractors 103, 104 absolute value circuits 105, 106 multiplier 109 negative clipping circuit 201 color signal generation circuit 202 color judgment Circuit 203 Color signal limiting circuit

Claims (3)

映像信号より目標の被写体を判別し、判別信号を出力する目標被写体判別回路と、目標被写体の認識が容易になるような強調処理を行なう目標被写体強調回路とを備え、ビューファインダーに出力する映像信号にのみ前記目標被写体判別回路の出力に従って、目標被写体映像部分に認識が容易になる処理を行なうことを特徴とする目標被写体強調機能付き撮像装置。A video signal to be output to a viewfinder, including a target subject determination circuit that determines a target subject from a video signal and outputs a determination signal, and a target subject enhancement circuit that performs enhancement processing to facilitate recognition of the target subject. An image pickup apparatus with a target object emphasis function, which performs processing for easily recognizing a target object image portion in accordance with an output of the target object discriminating circuit. 前記目標被写体判別回路は、映像信号より任意の独立した2つの色信号を生成する色信号生成回路と、前記生成された2つの色信号と予め設定された第1、第2の設定値との差分信号を算出する第1、第2の減算器と、前記第1、第2の減算器の出力の絶対値を算出する絶対値回路と、前記絶対値回路出力のゲインを調整する第1、第2の乗算器と、前記第1の乗算器の出力と予め設定された第3の設定値との差信号を算出する第3減算器と、前記第3の減算器出力と前記第2の乗算器との差信号を算出する第4の減算器と、前記第4の減算器出力の負の値を零に置き換える負クリップ回路とを備え、前記負クリップ回路の出力は、零以外の値が特定色領域を示し、かつ、特定色らしさの度合いを示す信号として、前記第1、第2の設定値と前記2つの色信号との差分に応じた零ないし第3の設定値の値をとり、この出力信号を目標被写体を判別する信号として用いることを特徴とする請求項1記載の目標被写体強調機能付き撮像装置。The target subject discriminating circuit includes a color signal generating circuit that generates two independent color signals from the video signal, and a color signal generating circuit that generates the color signals from the generated two color signals and first and second preset values. First and second subtracters for calculating a difference signal, an absolute value circuit for calculating an absolute value of an output of the first and second subtracters, and a first and a second circuit for adjusting a gain of an output of the absolute value circuit. A second multiplier, a third subtractor for calculating a difference signal between an output of the first multiplier and a third preset value, and an output of the third subtractor and the second subtractor. A fourth subtractor for calculating a difference signal from the multiplier; and a negative clip circuit for replacing a negative value of the output of the fourth subtractor with zero, wherein an output of the negative clip circuit is a value other than zero. Indicates a specific color area, and as a signal indicating the degree of specific color likeness, the first and second set values and 2. A target object emphasizing function according to claim 1, wherein a value of zero to a third set value corresponding to a difference between said two color signals is taken, and this output signal is used as a signal for judging a target object. Imaging device. 前記目標被写体強調回路は、色信号制限回路を備え、目標被写体判別信号に従って、目標被写体以外の色信号を制限することを特徴とする請求項1記載の目標被写体強調機能付き撮像装置。2. The imaging device with a target subject enhancement function according to claim 1, wherein the target subject enhancement circuit includes a color signal limiting circuit, and limits color signals other than the target subject according to the target subject determination signal.
JP2002290915A 2002-10-03 2002-10-03 Photographing device with target object enhancement function Pending JP2004128935A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9264620B2 (en) 2008-10-31 2016-02-16 Samsung Electronics Co., Ltd. Image photography apparatus and method for proposing composition based person

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9264620B2 (en) 2008-10-31 2016-02-16 Samsung Electronics Co., Ltd. Image photography apparatus and method for proposing composition based person

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