JPH09259278A - Image processor - Google Patents

Image processor

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Publication number
JPH09259278A
JPH09259278A JP6773396A JP6773396A JPH09259278A JP H09259278 A JPH09259278 A JP H09259278A JP 6773396 A JP6773396 A JP 6773396A JP 6773396 A JP6773396 A JP 6773396A JP H09259278 A JPH09259278 A JP H09259278A
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Prior art keywords
image
means
object
imaging
illumination
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JP6773396A
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Japanese (ja)
Inventor
Taro Imagawa
Susumu Maruno
Michiyo Moriya
進 丸野
太郎 今川
みち代 森家
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Matsushita Electric Ind Co Ltd
松下電器産業株式会社
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Abstract

PROBLEM TO BE SOLVED: To accurately extract only an object by easily separating a background and the object by using illumination at the time of extracting the object from natural images. SOLUTION: An image pickup means 2 image-picks up an image when an illumination means 1 irradiates the object and the background with light and a normal image and respectively stores them in an image storage means 4. An equipment control means 3 controls the illumination means 1 and the image pickup means 2. An image synthesis means 5 obtains the difference image of the two images stored by the image storage means 4 and an object extraction means 6 extracts the area of the object from the difference image obtained in the object extraction means 5 by a threshold value processing. Simultaneously, the control method of the equipment control means 3 is changed based on the result of the threshold value processing and adjustment is performed so as to obtain the more improved image. In such a manner, by performing the threshold value processing, noise generated by image pickup conditions is not extracted and an object area under a natural background is accurately extracted.

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【発明の属する技術分野】本発明は、画像から物体を抽出する処理機能を備えた画像処理装置に関する。 The present invention relates to relates to an image processing apparatus having a processing function of extracting an object from an image.

【0002】 [0002]

【従来の技術】従来は、背景と対象物体を含む画像(対象画像)から対象物体のみを抽出するために、黒や青などの単色の背景を用い、輝度情報や色情報に対するしきい値処理もしくはエッジ抽出処理などの物体抽出処理を施す手法が用いられる(従来例1)。 BACKGROUND OF THE INVENTION Conventionally, in order to extract only the target object from an image (object image) including the background and the object, using a solid background, such as black or blue, thresholding against luminance information and color information or method for performing object extraction processing such as edge extraction processing is used (conventional example 1). また、特殊な背景を用いずに対象物体を抽出する方法として、対象物体を含まない背景画像を用い、対象画像と背景画像との差分を求めた後、物体抽出処理を施す手法が挙げられる(従来例2)。 Further, as a method for extracting a target object without using a special background, using a background image not including the target object, after obtaining the difference between the target image and the background image, and a method of performing object extraction processing ( conventional example 2).

【0003】 [0003]

【発明が解決しようとする課題】従来例1においては、 In THE INVENTION Problem to be Solved] Conventional Example 1,
特殊な背景を用いる必要があるため、使用できる場所が限られるという問題点があった。 Since it is necessary to use a special background, there is a problem in that location that can be used is limited. また、従来例2においては、背景画像を取り込む際と対象画像を取り込む際の撮像条件の変化による影響が大きく、対象物体とともに撮像条件の違いにより生じるノイズを抽出してしまうという問題点があった。 Further, in the conventional example 2, significantly affected by changes in the imaging conditions for taking an object image when capturing the background image, there is a problem that extracts the noise caused by the difference in imaging conditions with the target object .

【0004】本発明は、これらの問題を解決するために、照明を用いて背景と対象物体を分離しやすくし、自然背景下の対象物体を精度良く抽出することを目的とする。 [0004] The present invention, in order to solve these problems, and an object thereof is to easily separate the background and the object, to accurately extract a target object under natural background with illumination.

【0005】 [0005]

【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、対象物体および背景に光を照射する照明手段と、前記対象物体および背景を撮像する撮像手段と、 Means for Solving the Problems The present invention to solve this problem, a lighting means for irradiating light to the object and the background, an imaging means for imaging the object and background,
前記照明手段と前記撮像手段の制御を行う機器制御手段と、前記撮像手段で撮像した画像を記憶させておく画像記憶手段と、前記画像記憶手段で記憶させた少なくとも2枚の画像情報を合成する画像合成手段と、前記画像合成手段で求めた画像情報から前記対象物体を抽出する物体抽出手段とを備えたものである。 And device control means for controlling said image pickup means and the illuminating means, synthesizes an image storing means for stores the image captured by the imaging means, at least two image information has been stored in said image storage means an image synthesizing means, is from the image information obtained by the image synthesizing means that a object extraction means for extracting the target object.

【0006】 [0006]

【発明の実施の形態】 DETAILED DESCRIPTION OF THE INVENTION

(実施の形態1)以下、本発明の第1の実施の形態について図1を用いて説明する。 (Embodiment 1) Hereinafter, a first embodiment of the present invention will be described with reference to FIG. 図1は本発明の実施の一形態のブロック図を示すものである。 Figure 1 illustrates a block diagram of one embodiment of the present invention. 図1に示すように、 As shown in FIG. 1,
対象物体および背景に光を照射する照明手段1と、対象物体および背景を撮像する撮像手段2と、照明手段1と撮像手段2の制御を行う機器制御手段3と、撮像手段2 An illumination means 1 for irradiating light to the object and the background, an imaging means 2 for imaging an object and the background, the device control means 3 for controlling the illumination means 1 and the imaging unit 2, imaging unit 2
で撮像した少なくとも2枚の画像を記憶させる画像記憶手段4と、画像記憶手段4で記憶させた画像を合成する画像合成手段5と、画像合成手段5で求めた合成画像から対象物体を抽出する物体抽出手段6とで構成し、機器制御手段3は、照明手段1の明るさの制御を行う照明制御部31と、単位時間当りの撮像枚数やシャッター速度などの撮像条件の制御を行う撮像制御部32とで構成する。 Extracted in an image storage unit 4 for storing at least two images captured, an image combining means (5) for synthesizing an image having stored in the image storage unit 4, the target object from the composite image obtained by the image synthesizing means 5 constituted by the object extraction unit 6, the device control means 3, an imaging control performed with illumination control unit 31 for performing brightness control of the illumination means 1, the control of the imaging conditions such as the number of imaging and shutter speed per unit time constituted by the parts 32.

【0007】図2は図1の照明制御部31の実施の一形態のブロック図を示すものである。 [0007] Figure 2 illustrates a block diagram of an embodiment of the illumination control unit 31 of FIG. 1. 図2において照明制御部31は、照明手段1の入切の切り替え操作を行うスイッチ311と、スイッチ311の制御を行うスイッチ制御部312とで構成する。 Illumination control unit 31 in FIG. 2 includes a switch 311 that performs on-off switching operation of the illumination unit 1 is composed of a switch controller 312 for controlling the switch 311.

【0008】以上のように構成した画像処理装置の動作を述べる。 [0008] describe the operation of the image processing apparatus configured as above. まず、照明手段1は対象物体およびその背景に光を照射し、撮像手段2は照明手段1が光を照射する対象物体およびその背景を撮像し、画像記憶手段4へ送出する。 First, the illumination unit 1 irradiates light to the object and the background, the image pickup unit 2 captures an object and its background illumination means 1 for irradiating light, and sends to the image storing unit 4. 照明手段1が光を照射する向きは図4に示すように、撮像手段2が対象物体を撮像する向きとほぼ同一の向きとする。 Orientation lighting unit 1 is irradiated with light, as shown in FIG. 4, it is substantially the same direction as the imaging means 2 for imaging an object. このとき撮像手段2が撮像する画像の例を図5に示す。 The time is shown an example of an image pickup means 2 is captured in FIG.

【0009】撮像手段2と背景との間の距離は撮像手段2と対象物体との間の距離に対して大きいため、照明手段1から背景に到達する光の量は、照明手段1から対象物体に到達する光の量に比べて小さくなり、結果として対象物体が背景に比べて明るく照射される。 [0009] large, the amount of light reaching the background from the illumination means 1 with respect to the distance between the distance between the imaging unit 2 and the target object between the imaging unit 2 and the background object from the illumination means 1 It becomes smaller than the amount of light reaching the result as a target object is irradiated brighter than the background. 従って、照明手段1が光を照射している際に撮像する画像は、図5 Thus, the image the illumination means 1 is captured when that light is irradiated, 5
(a)に示すような通常の画像に比べて、図5(b)のように対象物体の明るさのみを強調した画像となる。 Than ordinary images (a), the the image that emphasizes only the brightness of the object as shown in FIG. 5 (b).

【0010】照明手段1の制御は照明制御部31が行い、撮像手段2の制御は撮像制御部32が行うが、図2 [0010] Control of the lighting unit 1 performs the illumination control unit 31, control of the imaging unit 2 is an imaging control unit 32 performs, 2
のように照明制御部31を構成する場合、スイッチ31 When configuring the illumination control unit 31 as the switch 31
1により照明手段1のON/OFFの切り替えを行い、 To switch the ON / OFF of the illumination means 1 by 1,
撮像制御部32はスイッチ311のON/OFFの切り替えに応じて、照明が光を照射しているとき(スイッチがONの場合)、つまり図5(b)に示すような対象物体の明るさのみを強調した画像と、光を照射していないとき(スイッチがOFFの場合)、つまり図5(a)に示すような通常の画像を交互に撮像し、画像記憶手段4 The imaging control unit 32 according to the switching of the ON / OFF of the switch 311, (if the switch ON) when the illumination is irradiated with light, i.e. the brightness of the object as shown in FIG. 5 (b) only and an image emphasizing the (when the switch is in OFF) when not irradiated with light, and imaging that is alternately normal image as shown in FIG. 5 (a), image storing means 4
へ送出する。 And it sends it to.

【0011】画像記憶手段4は、撮像手段2が送出する光を照射しているときの画像と照射していないときの画像とを記憶し、画像合成手段5へ送出する。 [0011] The image storage unit 4 stores the image when the image has not been irradiated when being irradiated with light imaging means 2 is sent, and sends the image synthesis unit 5. 画像合成手段5は、画像記憶手段4が送出した2枚の画像の差分画像を求め、物体抽出手段6へ送出する。 Image synthesizing means 5 obtains a difference image between two images by the image storing unit 4 is sent, and sends it to the object extracting unit 6. 物体抽出手段6 Object extracting means 6
は、あるしきい値を用いて画像合成手段5が送出した差分画像に対してしきい値処理を行うことにより、対象物体の領域を抽出する。 The image synthesis means 5 by performing the threshold process on the difference image having sent, to extract the region of the target object by using a certain threshold value. 同時に、しきい値処理結果に基づいて照明制御部31および撮像制御部32の制御方法を変更し、より良好な画像が得られるよう調節する。 At the same time, to change the control method of the illumination control unit 31 and the imaging control unit 32 based on the thresholding result, adjusting to a more favorable image can be obtained. 例えば、しきい値処理により抽出された領域がある一定量よりも少ない場合、照明の光を強くする。 For example, if less than a certain amount is region extracted by threshold value processing, to increase the light illumination. このように、対象物体に光を照射して対象物体の領域の明るさを強調した画像と通常の画像との差分を求めてしきい値処理を行うことにより、撮像条件により生じるノイズを抽出せずに対象領域のみを精度良く抽出することができる。 Thus, by performing the threshold processing calculates the difference between the brightness enhancement image and normal image area of ​​the target object by irradiating light to the object, thereby extracting the noise caused by the imaging condition only the target area can be accurately extracted without. また、連続する2枚の画像を用いるため、背景の撮像条件の変化が小さく、ノイズを軽減することができる。 Moreover, since the use of two successive images, it is possible to change the imaging conditions of the background is small, to reduce the noise.

【0012】なお、本実施の形態でのスイッチ311の動作は、照明手段1の電源のON/OFFの切り替えを行うものであるが、スイッチ311の動作が照明手段1 [0012] The operation of the switch 311 in this embodiment is intended for switching ON / OFF of the power supply of the illumination means 1, operation illumination means 1 of the switch 311
の明るさの強弱の切り替えを行うものであっても同様の効果を得ることができる。 Even those which switches the brightness of the intensity of it is possible to obtain the same effect.

【0013】(実施の形態2)以下、本発明の第2の実施の形態について図3を用いて説明する。 [0013] (Embodiment 2) Hereinafter, a second embodiment of the present invention will be described with reference to FIG. 第2の実施の形態は、第1の実施の形態の撮像制御部32を図3に示すブロック図のように構成したものである。 The second embodiment is obtained by the imaging control unit 32 of the first embodiment constructed as the block diagram shown in FIG.

【0014】図3において、撮像制御部32は、照明手段1の照射する光の量(光束)を検出する光束センサ3 [0014] In FIG. 3, the imaging control unit 32, the light beam sensor 3 for detecting the amount of irradiated light of the illumination unit 1 (light flux)
21と、光束センサ321が計測した値に基づいて撮像手段2が対象物体を撮像するタイミングを決定する撮像指示部322とで構成する。 21, the imaging unit 2 is composed of a imaging instruction section 322 to determine when to image the target object based on the value flux sensor 321 is measured.

【0015】以上のように構成した画像処理装置の動作を述べる。 [0015] describe the operation of the image processing apparatus configured as above. 第1の実施の形態と同様に、照明手段1は、 Like the first embodiment, the illumination means 1,
対象物体の正面から対象物体及びその背景に光を照射し、撮像手段2は照明手段1が光を照射する対象物体およびその背景を撮像し、画像記憶手段4へ送出する。 Light is irradiated to the target object and the background from the front of the object, the imaging means 2 captures an object and its background illumination means 1 for irradiating light, and sends to the image storing unit 4. 照明手段1の制御は照明制御部31が行い、撮像手段2の制御は撮像制御部32が行うが、図3のように照明制御部31を構成する場合、照明制御部31は、照明手段1 Control of the illumination means 1 performs the illumination control unit 31, control of the imaging unit 2 is performed by the imaging control unit 32, but when configuring the illumination control unit 31 as shown in FIG. 3, the illumination control unit 31, the illumination means 1
が常に対象物体および背景を照射するように制御する。 There is always controlled so as to irradiate the target object and the background.
このとき、照明手段1は蛍光灯のように時間によって光束が変化する照明を用いる。 At this time, the illuminating means 1 is used varying illumination light flux by the time as a fluorescent lamp.

【0016】また、光束センサ321は照明手段1の照射する光の量(光束)を検出し、撮像指示部322は光束センサ321の検出する光束の値に応じて撮像手段2 Further, flux sensor 321 detects the amount of light irradiation of the illumination means 1 (light flux), the imaging instruction section 322 imaging unit 2 according to the value of the luminous flux detected by the flux sensor 321
が対象物体および背景を撮像するタイミングを決定し、 There determines when imaging an object and a background,
決定したタイミングに応じて撮像手段2の制御を行う。 And it controls the imaging unit 2 according to the determined timing.
例えば照明手段1が照射する光が図6に示すような特性を持つ場合、撮像指示部322は、光束が最大値Fmaxとなる時間Tmaxと、最小値Fminとなる時間Tminとにおいて画像を撮像するように、撮像手段2に対して指示を出す。 For example, when the light illuminating means 1 is irradiated with the characteristics shown in FIG. 6, the imaging instructing section 322 captures time Tmax which the light beam is the maximum value Fmax, the image at the time Tmin with the minimum value Fmin as described above, it instructs the imaging unit 2.

【0017】このように撮像手段2の制御を行うことによって、照明手段1の光束が多いとき、つまり対象物体の明るさを特に強調した画像と、照明手段1が照射する光の量が少ないとき、つまり対象物体の明るさをあまり強調していない画像とを交互に撮像することになり、画像記憶手段4ではこれら2種類の画像を1枚づつ記憶し、画像合成手段5へ送出する。 [0017] By performing such control of the image pickup unit 2, when the light flux of the lighting unit 1 is large, that is an image in which special emphasis on brightness of the object, when the amount of light illuminating means 1 is irradiated is small , i.e. it will be imaged and an image that is not the brightness of the object so much emphasized alternately, the image storing unit 4 these two images one by one stored in, and sends to the image synthesis unit 5. この後の処理及び照明手段1の照射の向き(図4参照)は、第1の実施の形態と同様である。 Treatment and irradiation direction of the illumination means 1 after the (see FIG. 4) is similar to the first embodiment.

【0018】このように、照明手段1の持つ特性を用いて対象物体の領域の明るさを特に強調した画像とあまり強調していない画像を撮像し、これらの差分を求めしきい値処理を行うことにより、撮像条件により生じるノイズを抽出せずに対象領域のみを精度良く抽出することができる。 [0018] Thus, by imaging an image not particularly emphasized image and overemphasized the brightness of regions of the target object by using the characteristics of the illumination unit 1, performs a threshold processing obtains these differences it is thereby possible to only target region accurately extracted without extracting the noise caused by the imaging conditions. また、実施の形態1と同様、連続する2枚の画像を用いるため、背景や対象領域の撮像条件の変化が小さく、ノイズを軽減することができる。 Also, as in the first embodiment, since the use of two successive images, it is possible to change the imaging conditions of the background and the target area is small, to reduce the noise.

【0019】以上の示したように、第1,第2の実施の形態ともに、対象物体の明るさのみを強調した画像を用いるため、自然背景下においても、対象物体を精度良く抽出することができる。 [0019] As indicated above, the first, both the second embodiment, for using the image that emphasizes only the brightness of the target object, even under natural circumstances, it is accurately extracted object it can. なお、対象物体が人体の場合、 Incidentally, when the target object is a human body,
照明手段1に用いる光の種類を非可視光線とすると、通常の光を用いる場合のように対象者がまぶしく感じることがなく、対象者の負担を軽減することができる。 When the type of light used for illumination means 1 and non-visible light, without the subject feels glaring as in the case of using the ordinary light, it is possible to reduce the burden on the subject. さらに、照明手段が照射する光の向きが、撮像手段が対象物体を撮像する向きとほぼ等しいため、照明手段1による対象物体の影が生じにくく、照明を用いることによる悪影響を受けないという利点がある。 Furthermore, the orientation of the light illuminating means is irradiated, because substantially equal to the direction in which the imaging means for imaging an object, the shadow of the object is less likely to occur by the illumination means 1, the advantage of not adversely affected by the use of illumination is there.

【0020】 [0020]

【発明の効果】以上のように本発明によれば、対象物体に光を照射し、対象物体の領域の明るさを強調することによって、対象物体と背景とを分離しやすくし、自然背景下の対象物体を正確に抽出することができる。 According to the present invention as described above, according to the present invention, light is irradiated to the target object, by emphasizing the brightness of the region of the target object, and easily separate the target object and the background, under natural background it can be the target object accurately extracted.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明による画像処理装置の一実施の形態を示すブロック図 Block diagram showing an embodiment of FIG. 1 an image processing apparatus according to the present invention

【図2】図1の機器制御手段3の第1の実施の形態を示すブロック図 2 is a block diagram showing a first embodiment of the device control means 3 of FIG. 1

【図3】図1の機器制御手段3の第2の実施の形態を示すブロック図 3 is a block diagram illustrating a second embodiment of the device control means 3 of FIG. 1

【図4】本発明の実施環境の一例を示す図 Diagram showing one example of an environment of the present invention; FIG

【図5】(a),(b)撮像手段2において撮像した画像の一例を示す図 [5] (a), shows an example of an image captured in (b) imaging means 2

【図6】照明手段1の照射する光の量の時間変化の一例を示す図 6 is a diagram showing an example of a temporal change in the amount of irradiated light of the illumination means 1

【符号の説明】 DESCRIPTION OF SYMBOLS

1 照明手段 2 撮像手段 3 機器制御手段 4 画像記憶手段 5 画像合成手段 6 物体抽出手段 31 照明制御部 32 撮像制御部 311 スイッチ 312 スイッチ制御部 321 光量センサ 322 撮像指示部 1 illumination means 2 imaging means 3 instrument controller 4 image storage means 5 the image synthesizing unit 6 object extracting means 31 illumination control unit 32 the imaging control unit 311 switch 312 switch controller 321 intensity sensor 322 imaging instruction section

Claims (8)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】対象物体および背景に光を照射する照明手段と、前記対象物体および背景を撮像する撮像手段と、 And 1. A lighting means for irradiating light to the object and the background, an imaging means for imaging the object and background,
    前記照明手段と前記撮像手段の制御を行う機器制御手段と、前記撮像手段で撮像した画像を記憶させておく画像記憶手段と、前記画像記憶手段で記憶させた少なくとも2枚の画像情報を合成する画像合成手段と、前記画像合成手段で求めた画像情報から前記対象物体を抽出する物体抽出手段とを備えることを特徴とする画像処理装置。 And device control means for controlling said image pickup means and the illuminating means, synthesizes an image storing means for stores the image captured by the imaging means, at least two image information has been stored in said image storage means an image combining unit, an image processing apparatus characterized by the image information obtained by the image synthesizing unit and a object extraction means for extracting the target object.
  2. 【請求項2】機器制御手段は、画像合成手段で求めた画像情報に基づいて機器の制御方法を逐次更新することを特徴とする請求項1記載の画像処理装置。 Wherein the device control means, an image processing apparatus according to claim 1, wherein the sequential updating the control method of the apparatus based on image information obtained by the image synthesizing means.
  3. 【請求項3】機器制御手段は、撮像手段の制御を行う撮像制御部と、照明手段の明るさの制御を行う照明制御部とで構成することを特徴とする請求項1または2記載の画像処理装置。 3. A device control unit, according to claim 1 or 2, wherein the image characterized in that it consists of an illumination control unit that performs an imaging control unit for controlling the imaging means, the control of the brightness of the illumination means processing apparatus.
  4. 【請求項4】照明制御部は、照明手段のスイッチと、前記スイッチの制御を行うスイッチ制御部とで構成することを特徴とする請求項3記載の画像処理装置。 Wherein the illumination control unit includes a switch illuminating means, the image processing apparatus according to claim 3, wherein the configuring in a switch control unit for controlling said switch.
  5. 【請求項5】スイッチ制御部は、撮像手段の単位時間当りの撮像枚数に合わせてスイッチの入切を繰り返すように制御を行い、スイッチの入っている状態の画像と入っていない状態の画像を画像記憶手段に送出することを特徴とする請求項4記載の画像処理装置。 5. The switch control unit performs control to repeat the on-off switch in accordance with the number of imaging per unit time of the image pickup means, the image without entering the image in a state that contains the switch the image processing apparatus according to claim 4, wherein the sending the image storage means.
  6. 【請求項6】撮像制御部は、照明手段の照射する光の量を検出する光束センサと、前記光束センサが計測した値に基づいて撮像手段が対象物体を撮像するタイミングを決定する撮像指示部とで構成することを特徴とする請求項3記載の画像処理装置。 6. The imaging control unit includes a flux sensor that detects the amount of irradiated light of the illumination means, the light imaging instruction section beam sensor imaging means on the basis of the value measured to determine when to image the target object It is composed of an image processing apparatus according to claim 3, wherein.
  7. 【請求項7】画像記憶手段は、撮像手段が送出する画像と予め撮像しておいた背景画像とを記憶することを特徴とする請求項1または2記載の画像処理装置。 7. The image storage means, the image processing apparatus according to claim 1 or 2, wherein the storing the background image previously captured with the image pickup means sends out.
  8. 【請求項8】照明手段で用いる光線は非可視光線であることを特徴とする請求項1または2記載の画像処理装置。 8. A light used in the illumination unit image processing apparatus according to claim 1 or 2, wherein it is a non-visible light.
JP6773396A 1996-03-25 1996-03-25 Image processor Pending JPH09259278A (en)

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