JP5279605B2 - Individual imaging apparatus and monitoring system - Google Patents
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固体撮像素子を用いた撮像装置の監視システム改良に関するものである。 The present invention relates to an improvement of a monitoring system for an imaging apparatus using a solid-state imaging device.
近赤外線と中赤外線と遠赤外線との定義は、目的や業界により様々なので、以下赤外線の定量的な区別を大気中の透過性の概略波長で行う。 Since the definitions of near infrared, mid infrared, and far infrared vary depending on the purpose and industry, the following is a quantitative distinction between infrared rays using the approximate wavelength of transparency in the atmosphere.
図６は遠赤外線監視の動作を示す模式図で可視光と赤外線の１．８ｋｍの大気中の透過性の概略である。図６において、太陽光は大気の窓と称される特定波長０．４μｍ−１．３μｍ（可視光と近赤外線の短波長側）と１．５μｍ−１．８μｍ（近赤外線の中央波長）と２μｍ−２．６μｍ（近赤外線の長波長側）と３μｍ−４．２μｍと４．４μｍ−５μｍ（中赤外線）と８−１４μｍ（遠赤外線）で１．８ｋｍの大気を大きく減衰せずに通過する。（非特許文献１参照）ところで８−１４μｍ（遠赤外線）では放射強度と３０℃前後の物体温度とが比例し、太陽光が低レベルである。（非特許文献２参照）
つまり、５μｍ以下の赤外線を検出する赤外線固体撮像素子を用いた撮像装置を有する監視システムでは、被写体に太陽光が直接当たる状態では太陽光の影響を受け、背景と移動物体との区別が困難である。したがって、従来の撮像装置の全体構成を示すブロック図の図５の様に、８−１４μｍの固体撮像素子とカルコゲナイド(S,Se,Te,Ge,As,Sb)等８−１４μｍの遠赤外線光学系を用い、被写体の８−１４μｍの放射強度を温度で色分けして映像出力する撮像装置を用いる。
FIG. 6 is a schematic diagram showing the operation of far-infrared monitoring, and is an outline of the transparency of visible light and infrared rays in the atmosphere of 1.8 km. In FIG. 6, sunlight has a specific wavelength of 0.4 μm to 1.3 μm (short wavelength side of visible light and near infrared) and 1.5 μm to 1.8 μm (center wavelength of near infrared) which are called atmospheric windows. 2μm-2.6μm (near infrared long wavelength side), 3μm-4.2μm, 4.4μm-5μm (middle infrared) and 8-14μm (far infrared) pass through 1.8km air without significant attenuation To do. (See Non-Patent Document 1) By the way, in 8-14 μm (far infrared), the radiation intensity is proportional to the object temperature around 30 ° C., and sunlight is at a low level. (See Non-Patent Document 2)
In other words, in a monitoring system having an imaging device using an infrared solid-state imaging device that detects infrared rays of 5 μm or less, it is difficult to distinguish between a background and a moving object under the influence of sunlight when the subject is directly exposed to sunlight. is there. Therefore, as shown in FIG. 5 of the block diagram showing the entire configuration of the conventional imaging apparatus, an 8-14 μm far-infrared optical system such as an 8-14 μm solid-state imaging device and a chalcogenide (S, Se, Te, Ge, As, Sb) is used. This system uses an imaging device that outputs an image by color-coding the radiation intensity of 8-14 μm of a subject according to temperature.
しかし、夏の晴天では、直射日光が当たり続けた舗装面温度が、体温以上に上昇し、人体と被写体の８−１４μｍの放射強度が同等以上になり、区別が付かない。具体的には従来の撮像装置の全体構成を示すブロック図の図５の体温と同等温度の背景の１９と、人物６との区別が付かない。２００７年には４０度以上の気温も熊谷等の複数個所で複数回記録した。そこで、体温より高温の背景の１８もありうる。 However, in clear weather in summer, the pavement surface temperature that has been exposed to direct sunlight rises above body temperature, and the radiant intensity of 8-14 μm of the human body and the subject becomes equal to or greater than each other, making it indistinguishable. Specifically, the background 19 having the same temperature as the body temperature in FIG. 5 of the block diagram showing the overall configuration of the conventional imaging apparatus cannot be distinguished from the person 6. In 2007, temperatures over 40 ° C were recorded several times at multiple locations such as Kumagaya. Therefore, there may be a background 18 that is hotter than the body temperature.
そのため、侵入物体を検出するセンサ１７が、可視光のガラスレンズ１２と可視光の固体撮像素子とを用いる撮像装置１３と８−１４μｍの遠赤外線撮像装置１１とに併用されていた。 Therefore, the sensor 17 for detecting an intruding object is used in combination with the imaging device 13 using the visible light glass lens 12 and the visible light solid-state imaging device and the 8-14 μm far-infrared imaging device 11.
ガラス、金属、結晶の非球面研磨精度が５μｍ以下と遠赤外線波長８−１５μｍと同等以下となり、遠赤外線透過の非球面光学系が実用化された。（非特許文献３参照）マルチ成形研削盤の非球面レンズ加工も０．２μｍ以下の精度で高速化され、非球面補正レンズを用いたシュミットカセグレン天体望遠鏡の納期が１／１２に短縮された。（非特許文献４参照）その結果、遠赤外線レンズの収差とフレアとゴーストが低減し、コントラストと変調度が向上した。 The aspherical polishing accuracy of glass, metal, and crystal is 5 μm or less, which is equal to or less than the far-infrared wavelength of 8 to 15 μm. (See Non-Patent Document 3) The aspherical lens processing of the multi-molded grinding machine has also been speeded up with an accuracy of 0.2 μm or less, and the delivery time of the Schmidt Cassegrain telescope using an aspherical correction lens has been shortened to 1/12. As a result, the aberration, flare, and ghost of the far-infrared lens were reduced, and the contrast and the degree of modulation were improved.
さらに、水平６４０画素垂直４８０画素と従来のテレビジョンと同等画素の遠赤外線撮像素子も製品化された（非特許文献５参照）。 Furthermore, a far-infrared imaging device having horizontal 640 pixels and vertical 480 pixels and pixels equivalent to those of a conventional television has also been commercialized (see Non-Patent Document 5).
輪郭補正のオーバーシュートやアンダーシュートは温度測定の誤差となるので、輪郭補正は８−１４μｍの撮像装置では実施しないのが一般的だった。 Contour correction overshoot and undershoot are errors in temperature measurement, so contour correction is generally not performed with an 8-14 μm imaging device.
ところで、可視光のカラーカメラでは、ラインメモリを２本有し、０から２までの整数水平周期分遅らせた各映像信号から垂直輪郭補正信号を発生している。さらに、３ＣＣＤの高級監視カメラでは、照度が確保されている、低感度時は、輪郭補正周波数帯域を広くして、画面上の輪郭が細く自然になる様にしている。そして、高感度時に水平輪郭補正の中心周波数を低下させていた（特許文献１参照）。また、雑音を防止するため、小振幅の輪郭補正信号は圧縮制限していた。また、輪郭が過剰に強くなるのを防止するため、大振幅の輪郭補正信号は圧縮制限していた。さらに、放送用カメラでは、輪郭が過剰に強くなるのを防止するため暗部の輪郭補正信号を減衰させ、顔のしわを目立たなくするため肌色の部分は輪郭補正信号を負極性にしていた。 By the way, the visible color camera has two line memories, and generates a vertical contour correction signal from each video signal delayed by an integer horizontal period from 0 to 2. Further, in the high-quality surveillance camera of 3CCD, when the illuminance is ensured and the sensitivity is low, the contour correction frequency band is widened so that the contour on the screen becomes thin and natural. And the center frequency of horizontal outline correction was reduced at the time of high sensitivity (refer patent document 1). In addition, in order to prevent noise, the contour correction signal with a small amplitude has been limited in compression. Further, in order to prevent the contour from becoming excessively strong, the contour correction signal having a large amplitude has been compression limited. Further, in the broadcast camera, the contour correction signal in the dark portion is attenuated to prevent the contour from becoming excessively strong, and the skin correction portion has a negative polarity in the contour correction signal to make the wrinkle of the face inconspicuous.
４μｍ以上の赤外線は、可視光用ガラスを透過しない。そのため、カルコゲナイド(S,Se,Te,Ge,As,Sb)製のレンズを組合せて使用するが、可視光用レンズに比較し、収差もフレアも大きく、光学変調度（ＯＴＦ）も低周波数から低く、コントラストも解像度も低い。カメラの総合変調度（ＭＴＦ）はＯＴＦに撮像素子の変調度をかけたものになり、ＯＴＦより低くなる。 Infrared rays of 4 μm or more do not pass through the visible light glass. For this reason, chalcogenide (S, Se, Te, Ge, As, Sb) lenses are used in combination, but the aberration and flare are larger and the optical modulation factor (OTF) is lower than that of visible light lenses. Low, low contrast and resolution. The total modulation factor (MTF) of the camera is obtained by multiplying the OTF by the modulation factor of the image sensor, and is lower than the OTF.
カルコゲナイド製等の赤外線用平板も可視光用ガラス製の平板に比較し、平面性が悪く、反射も大きく、光学絞り中心付近に光量減衰（ＮＤ）フィルタ（スポットＮＤ）を配置すると画質劣化が伴う。 An infrared flat plate made of chalcogenide or the like is also less flat and has a larger reflection than a flat plate made of glass for visible light, and if a light amount attenuation (ND) filter (spot ND) is placed near the center of the optical aperture, image quality deterioration is accompanied. .
さらに、８−１４μｍの赤外線は３００Ｋ付近の温度に比例するから、撮像素子の赤外線放射が、レンズで反射し、高放射物体を撮像した画素の周囲画素の低放射レベルが特に上昇し、高放射物体の輪郭がにじんでしまう。 Furthermore, since the infrared ray of 8-14 μm is proportional to the temperature around 300K, the infrared radiation of the image sensor is reflected by the lens, and the low radiation level of the surrounding pixels of the pixel that images the high radiation object is particularly increased, resulting in high radiation. The outline of the object is blurred.
そのため、水平６４０ｘ垂直４８０のＶＧＡ以上の画素数の固体撮像素子を用いても、波長の光学系の絞り値倍と同等の画素ピッチのため光学分解の理論限界領域になり、収差の少ない高価な非球面レンズを用いても水平方向も垂直方向も低周波数から低い変調度となる。具体的には光学系の絞り値Fnoと光の波長λと垂直有効画素数Nvと有効画面高さhとから空間周波数ωは ω=2*Fno*λ*Nv/hとなり、光学変調度OTFは、OTF=(2*arccos(ω/2)-sin(2*arccos(ω/2))/πとなる。λ＝１０μｍでFnoを1としてもNv＝４８０で画素ピッチ２３．５μｍでｈ＝１１．２８ｍｍならOTFは０．４７５と半減する。 Therefore, even if a solid-state imaging device having a pixel number equal to or larger than VGA of horizontal 640 × vertical 480 is used, it becomes a theoretical limit region of optical resolution because of a pixel pitch equivalent to the aperture value multiple of the wavelength optical system, and is expensive with little aberration Even if an aspherical lens is used, both the horizontal and vertical directions have a low modulation degree from a low frequency. Specifically, the spatial frequency ω is ω = 2 * Fno * λ * Nv / h from the aperture value Fno of the optical system, the wavelength of light λ, the number of vertical effective pixels Nv, and the effective screen height h, and the optical modulation degree OTF OTF = (2 * arccos (ω / 2) −sin (2 * arccos (ω / 2)) / π) Even if λ = 10 μm and Fno is 1, Nv = 480 and pixel pitch 23.5 μm. = 11.28 mm, OTF is halved to 0.475.
可視光であっても、普及している交換レンズの結像寸法の撮像素子有効画高５．４ｍｍで垂直有効画素数４０００画素以上となると画素ピッチ１.３５μｍと、赤端波長０．７μｍの２倍以下で緑中心波長０．５５μｍの２．４倍となり、光学分解の理論限界領域になり、高価な蛍石や低分散ガラスや高屈折ガラスを組み合わせて収差を低減してもFno２以上の実用領域では、低周波数から低い変調度となる。家電ＨＤＴＶの結像寸法である撮像素子有効画高約３ｍｍで垂直有効画素数２０００画素以上となっても同様となる事が予想される。また、撮像素子の感度に比較して、被写体照度が高く、レンズ等の光学系の絞りを絞り過ぎて光学系の変調度が低くなり過ぎることを防止するため、光量減衰（ＮＤ）フィルタを用いる。放送用カメラでは、複数のＮＤを内蔵し複数のＮＤを切り替えて高い変調度を確保しているが、監視用カメラでは、光学絞り中心付近に光量減衰（ＮＤ）フィルタ（スポットＮＤ）を配置すると画質劣化が伴う。また、可視光の波長による焦点のずれ（分散）の少なさをアッベ数νdで示すが、蛍石のνdは９５．２で、低分散ガラスのνdは８０から９５である。νdが９０以下のガラスのみ用いる３０倍以上のズームレンズやνdが９５以下のガラスのみ用いる７０倍以上のズームレンズでは、望遠端付近で、収差が残り、低周波数から低い変調度となる。 Even in the case of visible light, if the effective image height of the imaging element with an imaging dimension of the popular interchangeable lens is 5.4 mm and the number of vertical effective pixels is 4000 pixels or more, the pixel pitch is 1.35 μm and the red end wavelength is 0.7 μm. Less than 2 times is 2.4 times the green center wavelength of 0.55 μm, which is the theoretical limit of optical resolution. Even if aberration is reduced by combining expensive fluorite, low dispersion glass, or high refractive glass, Fno2 or more In a practical range, the modulation rate is low from low frequency. This is expected to be the same even when the effective image height of the image pickup device, which is the imaging dimension of home appliance HDTV, is about 3 mm and the number of vertical effective pixels is 2000 pixels or more. In addition, a light amount attenuation (ND) filter is used to prevent the illuminance of the subject from being high compared to the sensitivity of the image sensor and the optical system such as a lens from being too narrow and the modulation degree of the optical system from becoming too low. . A broadcast camera incorporates a plurality of NDs and switches a plurality of NDs to ensure a high degree of modulation. However, in a surveillance camera, a light amount attenuation (ND) filter (spot ND) is arranged near the center of the optical aperture. Degradation of image quality is accompanied. Further, the small deviation of focus (dispersion) due to the wavelength of visible light is shown by Abbe number νd, νd of fluorite is 95.2, and νd of low dispersion glass is 80 to 95. In a zoom lens of 30 times or more using only glass with νd of 90 or less, or a zoom lens of 70 times or more using only glass with νd of 95 or less, aberration remains in the vicinity of the telephoto end, and the modulation degree is low from a low frequency.
また、電子増倍ＣＣＤ撮像素子（Electron Multiplying-ＣＣＤ以下ＥＭ−ＣＣＤと略す）は、電子冷却と組み合わせて感度を高くできるが、ＥＭ−ＣＣＤの電子増倍を行う水平転送電極（Charge Multiplication Gate以下ＣＭＧと略す）は、ＣＭＧ電圧振幅が高い高電子増倍時は、電子増倍率が揺らぎ、１／ｆ低周波雑音成分が増大する。そのため、ＥＭ−ＣＣＤを特に強く電子冷却してＣＭＧ電圧振幅も最小限にする（非特許文献６参照）。ＣＭＯＳ撮像素子は安価だが、１／ｆ低周波雑音成分が大きくなり易い。波長同等の画素ピッチを有する固体撮像素子も１／ｆ低周波雑音成分が大きくなり易い。 An electron multiplying CCD image sensor (Electron Multiplying-CCD, hereinafter abbreviated as EM-CCD) can be combined with electronic cooling to increase sensitivity, but a horizontal transfer electrode (Charge Multiplication Gate or less) that performs electron multiplication of the EM-CCD. (Abbreviated as CMG), when high electron multiplication with high CMG voltage amplitude, the electron multiplication factor fluctuates and the 1 / f low frequency noise component increases. Therefore, the EM-CCD is particularly strongly electronically cooled to minimize the CMG voltage amplitude (see Non-Patent Document 6). CMOS image sensors are inexpensive, but the 1 / f low frequency noise component tends to increase. A solid-state imaging device having a pixel pitch equivalent to the wavelength also tends to have a large 1 / f low frequency noise component.
本発明の目的は、固体撮像素子の、垂直方向も低周波数から低い変調度を補うこととオーバーシュートやアンダーシュートを押さえることの両立である。 An object of the present invention is to simultaneously compensate for a low degree of modulation from a low frequency in the vertical direction of the solid-state imaging device and suppress overshoot and undershoot.
上記課題を達成するため、本発明では、光学系と波長の前記光学系の絞り値倍の３倍以下の画素ピッチを有する固体撮像素子と輪郭補正機能を含めた映像信号処理回路とを有する固体撮像装置において、ラインメモリを２Ｎ（Ｎは自然数）＋５本以上有し、０から２Ｎ＋５までの整数水平周期分遅らせた複数の各映像信号から発生した垂直輪郭補正信号を加算した映像信号を出力することを特徴とする固体撮像装置である。 In order to achieve the above object, according to the present invention, a solid-state image sensor has a solid-state imaging device having a pixel pitch that is not more than three times the aperture value of the optical system, and a video signal processing circuit including a contour correction function. In the image pickup apparatus, a video signal having 2N (N is a natural number) +5 or more line memories and adding vertical contour correction signals generated from a plurality of video signals delayed by an integer horizontal period from 0 to 2N + 5 is output. This is a solid-state imaging device.
つまり本発明は、８−１４μｍの遠赤外線固体撮像素子において画素ピッチが（８−１４μｍの中心波長の３倍の）３３μｍ以下の遠赤外線固体撮像素子や撮像素子有効画高５．４ｍｍ以下で垂直有効画素数４０００画素以上の固体撮像素子や撮像素子有効画高約３ｍｍで垂直有効画素数２０００画素以上の固体撮像素子を用いた撮像装置の特有の垂直方向も低周波数から低い変調度を補う信号処理による補正の工夫である。また、撮像素子の感度に比較して、被写体照度が高く、レンズ等の光学系の絞りを絞り過ぎたり、ズームレンズ望遠端の収差補正不足で、光学系の変調度ＯＴＦが低くなった場合の、低周波数から低い変調度を補う信号処理による補正の工夫である。 That is, the present invention is a far infrared solid-state imaging device having a pixel pitch of 33 μm or less (three times the center wavelength of 8-14 μm) or an imaging device effective image height of 5.4 mm or less in a 8-14 μm far-infrared solid imaging device. A signal that compensates for a low modulation factor from a low frequency also in a specific vertical direction of an imaging device using a solid-state imaging device having 4000 or more effective pixels and a solid-state imaging device having an effective image height of about 3 mm and a vertical effective pixel number of 2000 or more. It is a device for correction by processing. Also, when the illuminance of the subject is high compared to the sensitivity of the image sensor, the aperture of the optical system such as a lens is excessively reduced, or the aberration correction at the telephoto end of the zoom lens is insufficient, and the modulation degree OTF of the optical system is low. This is a device for correction by signal processing that compensates for a low modulation degree from a low frequency.
また、光学系と３３μｍ以下の画素ピッチを有し水平６４０画素垂直４８０画素以上の８−１４μｍの遠赤外線撮像素子と輪郭補正機能を含めた映像信号処理回路とを有し、ラインメモリを２Ｎ（Ｎは自然数）＋５本以上有し、０から２Ｎ＋５までの整数水平周期分遅らせた複数の各映像信号からから発生した垂直輪郭補正信号を加算した映像信号を出力する固体撮像装置と、前記光学系に精度がおおよそ（８−１４μｍの中心波長の）１１μｍ以下でかつ絞り値がおおよそ２以下のカルコゲナイド製非球面レンズまたは精度がおおよそ１１μｍ以下でかつ絞り値がおおよそ２以下の反射望遠鏡の少なくとも一方と、画像処理装置とを用い、前記固体撮像装置から出力した映像信号を前記画像処理装置で処理することにより移動物体の進入を検出することを特徴とする監視システムである。 It also has an optical system, an 8-14 μm far-infrared imaging device having a pixel pitch of 33 μm or less, a horizontal 640 pixels and a vertical 480 pixels or more, and a video signal processing circuit including a contour correction function. N is a natural number) +5 or more, and outputs a video signal obtained by adding vertical contour correction signals generated from a plurality of video signals delayed by an integer horizontal period from 0 to 2N + 5, and the optical system And at least one of a chalcogenide aspherical lens having an accuracy of approximately 11 μm or less (of a central wavelength of 8-14 μm) and an aperture value of approximately 2 or less, or a reflecting telescope having an accuracy of approximately 11 μm or less and an aperture value of approximately 2 or less. Detecting the entry of a moving object by processing the video signal output from the solid-state imaging device with the image processing device It is the monitoring system characterized by doing.
また、光学系と波長の前記光学系の絞り値倍の３倍以下の画素ピッチを有する固体撮像素子と電子増倍ＣＣＤ撮像素子とＣＭＯＳ撮像素子との少なくとも一つの固体撮像素子と、輪郭補正機能を含めた映像信号処理回路とを有する固体撮像装置において、ラインメモリを２Ｎ（Ｎは自然数）＋５本以上有し、所定の映像信号レベル以上（の明部）では、０から２Ｎ＋５までの整数水平周期分遅らせた複数の各映像信号から発生した垂直輪郭補正信号を加算した映像信号を出力し、所定の映像信号レベル以下（の暗部）では、０から２Ｎ＋５までの整数水平周期分遅らせた複数の各映像信号から発生した加重平均（雑音低減映像）信号を加算した映像信号を出力することを特徴とする固体撮像装置である。 And a solid-state imaging device having a pixel pitch that is three times or less the aperture value of the optical system and the optical system, an electron multiplying CCD imaging device, and a CMOS imaging device, and a contour correction function 2N (N is a natural number) +5 or more, and above a predetermined video signal level (bright part), an integer horizontal from 0 to 2N + 5 A video signal obtained by adding vertical contour correction signals generated from a plurality of video signals delayed by a period is output, and a plurality of video signals delayed by an integer horizontal period from 0 to 2N + 5 below (a dark part of) a predetermined video signal level. A solid-state imaging device that outputs a video signal obtained by adding a weighted average (noise-reduced video) signal generated from each video signal.
本発明の固体撮像装置では、垂直方向も低周波数から低い変調度の映像信号しか撮像素子から出力されなくても、オーバーシュートやアンダーシュートを押さえた輪郭補正を実施した映像信号を出力可能となる。 In the solid-state imaging device of the present invention, even if only a video signal with a low modulation rate from a low frequency is output in the vertical direction, it is possible to output a video signal subjected to contour correction that suppresses overshoot and undershoot. .
本発明の１実施例の赤外線監視システムの全体構成を示すブロック図の図４と、本発明の１実施例の垂直輪郭補正回路の詳細ブロック図の図１と、本発明の１実施例の垂直輪郭補正を示す模式図の図２とを用いて本発明の１実施例を説明する。 FIG. 4 is a block diagram showing the overall configuration of an infrared monitoring system according to one embodiment of the present invention, FIG. 1 is a detailed block diagram of a vertical contour correction circuit according to one embodiment of the present invention, and the vertical of one embodiment of the present invention. One embodiment of the present invention will be described with reference to FIG. 2 which is a schematic diagram showing contour correction.
本発明の１実施例の赤外線監視システムの全体構成を示すブロック図の図４と従来技術の赤外線監視システムの全体構成を示すブロック図５との相異は、図５のセンサ１７やガラス光学系１２や可視光撮像装置１３や画像処理装置１４や録画装置１６やモニタ１５がなく、遠赤外光学系１が非球面レンズまたは反射望遠鏡からなり、映像処理部９に７Ｈ等の多Ｈ垂直輪郭補正とを含むかどうかである。 The difference between FIG. 4 of the block diagram showing the overall configuration of the infrared monitoring system of one embodiment of the present invention and the block diagram 5 showing the overall configuration of the prior art infrared monitoring system is different from the sensor 17 and glass optical system of FIG. 12, visible light imaging device 13, image processing device 14, recording device 16, and monitor 15, far-infrared optical system 1 is composed of an aspheric lens or a reflective telescope, and multi-H vertical contour such as 7H is provided in image processing unit 9. Whether to include correction.
本発明の１実施例の多走査線（Ｈ）垂直輪郭補正回路の詳細ブロック図の図１と従来技術の可視光の垂直輪郭補正回路の詳細ブロック図の図３との相異は、ラインメモリの個数と乗算器の個数である。 The difference between FIG. 1 of the detailed block diagram of the multi-scanning line (H) vertical contour correction circuit of one embodiment of the present invention and FIG. 3 of the detailed block diagram of the conventional vertical contour correction circuit for visible light is the line memory. And the number of multipliers.
本発明の１実施例の赤外線監視システムの全体構成を示すブロック図の図４において、８−１４μｍの遠赤外線の中央波長１１μｍと２倍の２２μｍと３倍の３３μｍとから、１はカルコゲナイド(S,Se,Te,Ge,As,Sb)等８−１４μｍの遠赤外線透過光学系の精度がおおよそ１１μｍ以下でかつ絞り値がおおよそ２以下の非球面レンズまたは精度がおおよそ１１μｍ以下でかつ絞り値がおおよそ２以下の反射望遠鏡、２は８−１４μｍの遠赤外線撮像装置であり、３は侵入者検知や不審行動検出等の移動物体画像処理装置、４は映像表示装置（モニタ）、５は録画装置であり、６は移動物体、７は背景であり、８は１４ｂｉｔ以上のＡ／Ｄ含む２３．５μｍ等３３μｍ以下の画素ピッチの遠赤外撮像部、９は多走査線（Ｈ）垂直輪郭補正含む映像処理部である。 In FIG. 4 of the block diagram showing the overall configuration of the infrared monitoring system of one embodiment of the present invention, 1 is a chalcogenide (S) from the central wavelength of 8-14 μm far infrared rays of 11 μm, double 22 μm and triple 33 μm. , Se, Te, Ge, As, Sb) 8-14 μm far-infrared transmission optical system with an accuracy of approximately 11 μm or less and an aspherical lens with an aperture value of approximately 2 or less, or an accuracy of approximately 11 μm or less and an aperture value of Reflective telescope of 2 or less, 2 is a 8-14 μm far-infrared imaging device, 3 is a moving object image processing device such as intruder detection and suspicious behavior detection, 4 is a video display device (monitor), and 5 is a recording device 6 is a moving object, 7 is a background, 8 is a far-infrared imaging unit having a pixel pitch of 33 μm or less, such as 23.5 μm including A / D of 14 bits or more, and 9 is a multi-scan line (H) vertical contour correction Including the video processor .
本発明の１実施例の多Ｈ垂直輪郭補正回路の詳細ブロック図の図１において、２０〜２６、３３は加算器であり、Ｍ１〜Ｍ７はラインメモリ部であり、Ｎ１〜Ｎ３とＮ５〜Ｎ７は負の掛け算器であり、Ｐ４は正の掛け算器である。さらに、２７はレベル検出器であり、３１は小振幅大振幅の圧縮制限器であり、３２は正負と増幅度を可変する掛け算器である。 In FIG. 1 of the detailed block diagram of the multi-H vertical contour correction circuit of one embodiment of the present invention, 20 to 26 and 33 are adders, M1 to M7 are line memory units, and N1 to N3 and N5 to N7. Is a negative multiplier and P4 is a positive multiplier. Further, 27 is a level detector, 31 is a compression limiter having a small amplitude and a large amplitude, and 32 is a multiplier that varies the positive / negative and the amplification degree.
本発明の１実施例の多Ｈ垂直輪郭補正を示す模式図の図２において、(a)は低周波数から低い変調度の垂直輪郭補正前信号、(b)は垂直輪郭補正７Ｈ成分信号、(c)は垂直輪郭補正５Ｈ成分信号、(d)は垂直輪郭補正３Ｈ成分信号であり、(e)は垂直輪郭補正７Ｈ５Ｈ３Ｈ成分補正後信号である。つまり、本発明では、(b)の垂直輪郭補正７Ｈ成分と(c)の垂直輪郭補正５Ｈ成分と(d)の垂直輪郭補正３Ｈ成分とを加算することにより、(e)の垂直輪郭７H５H３H補正後信号は垂直輪郭が再生され、オーバーシュートやアンダーシュートによる画像処理装置３における輪郭検出誤りがほとんどなく輪郭検出が容易となる。また、本発明では、(c)の垂直輪郭補正５Ｈ成分と(d)の垂直輪郭補正３Ｈ成分とを加算することにより、(f)の垂直輪郭５H３H補正後信号は垂直輪郭がおおよそ再生され、画像処理装置３における輪郭検出誤りが少なく輪郭検出が容易となる。それに対し、(g)は従来の可視光用垂直輪郭補正を適用した垂直輪郭３Ｈ補正後信号であり、オーバーシュートやアンダーシュートによる垂直輪郭の前後に偽の負の垂直輪郭が発生し、画像処理装置３における輪郭検出誤りが多くなる。また、雑音を防止し輪郭が過剰に強くなるのを防止するため、本発明も従来と同様に、小振幅大振幅の圧縮制限器３１において小振幅の輪郭補正信号は圧縮制限する。さらに輪郭が過剰に強くなるのを防止するため、本発明も従来と同様に、レベル検出器２７で暗部を検出し、正負と増幅度を可変する掛け算器３２で暗部の輪郭補正信号を減衰させる。そして、加算器３３で４Ｈ映像信号に加算し垂直輪郭７H５H３H補正後の映像信号とする。 In FIG. 2 which is a schematic diagram showing multi-H vertical contour correction according to an embodiment of the present invention, (a) is a signal before vertical contour correction from a low frequency to a low modulation degree, (b) is a vertical contour correction 7H component signal, ( c) is a vertical contour correction 5H component signal, (d) is a vertical contour correction 3H component signal, and (e) is a signal after vertical contour correction 7H5H3H component correction. In other words, in the present invention, the vertical contour correction 7H component of (b), the vertical contour correction 5H component of (c) and the vertical contour correction 3H component of (d) are added, thereby correcting the vertical contour 7H5H3H of (e). The rear signal is reproduced as a vertical contour, and there is almost no contour detection error in the image processing apparatus 3 due to overshoot or undershoot, and the contour detection is easy. In the present invention, by adding the vertical contour correction 5H component (c) and the vertical contour correction 3H component (d), the vertical contour 5H3H corrected signal of (f) is roughly reproduced. There are few contour detection errors in the image processing apparatus 3, and contour detection is easy. On the other hand, (g) is a signal after vertical contour 3H correction to which the conventional vertical contour correction for visible light is applied, and a false negative vertical contour is generated before and after the vertical contour due to overshoot or undershoot. The contour detection error in the device 3 increases. In order to prevent noise and prevent the contour from becoming excessively strong, the present invention also limits the compression of the small amplitude contour correction signal in the small amplitude and large amplitude compression limiter 31 as in the prior art. Further, in order to prevent the contour from becoming excessively strong, the present invention also detects the dark portion with the level detector 27 and attenuates the contour correction signal for the dark portion with the multiplier 32 that changes the positive / negative and the amplification degree, as in the prior art. . Then, it is added to the 4H video signal by the adder 33 to obtain a video signal after the vertical contour 7H5H3H correction.
したがって、光学系の絞り値Fnoと光の波長λと垂直有効画素数Nvと有効画面高さhとから空間周波数ωは ω=2*Fno*λ*Nv/hとなり、光学変調度OTFは、OTF=(2*arccos(ω/2)-sin(2*arccos(ω/2))/πとなる。λ＝１０μｍでFnoを1としてもNv＝４８０で画素ピッチ２３．５μｍでｈ＝１１．２８ｍｍならOTFは０．４７５と半減しても、本発明の１実施例の多Ｈ垂直輪郭補正により、８−１４μｍの遠赤外線撮像装置から、温度測定精度は狂うが輪郭検出が容易な映像信号を発生させる事が可能となり、画像処理装置３における物体検出が容易になる。そこで、２３．５μｍ等３３μｍ以下の画素ピッチの遠赤外線撮像素子と、精度がおおよそ１１μｍ以下でかつ絞り値がおおよそ２以下の非球面レンズまたは、または精度がおおよそ１１μｍ以下でかつ絞り値がおおよそ２以下の反射望遠鏡であれば、８−１４μｍの遠赤外線の中央波長１１μｍ以下の精度で、変調度低下が補正可能な範囲で、本技術で低周波数から輪郭を補正すれば、画像処理装置３における物体検出が可能となる。 Therefore, the spatial frequency ω is ω = 2 * Fno * λ * Nv / h from the aperture value Fno of the optical system, the wavelength of light λ, the number of vertical effective pixels Nv, and the effective screen height h, and the optical modulation degree OTF is OTF = (2 * arccos (ω / 2) −sin (2 * arccos (ω / 2)) / π) Even if Fno is 1 at λ = 10 μm, Nv = 480, pixel pitch 23.5 μm and h = 11 Even if the OTF is halved to 0.475 at 28 mm, the multi-H vertical contour correction of one embodiment of the present invention makes it possible to detect the contour easily from the 8-14 μm far-infrared imaging device, but the temperature measurement accuracy is incorrect. This makes it possible to generate a signal and facilitates object detection in the image processing apparatus 3. Therefore, a far-infrared imaging device having a pixel pitch of 33 μm or less, such as 23.5 μm, and an accuracy of approximately 11 μm or less and an aperture value of approximately Aspherical lens of 2 or less, or the accuracy is approximately 11 μm or less and the aperture value is approximately 2 or less If the contour is corrected from a low frequency with the present technology within a range in which the decrease in modulation degree can be corrected with an accuracy of 11 μm or less of the center wavelength of far-infrared rays of 8-14 μm, the object in the image processing apparatus 3 Detection is possible.
本発明は、加算器やラインメモリ部や掛け算器の個数は７ヶに限定せず、回路規模が許容されるなら、７ヶ以上の自然数でも構わない。加算器やラインメモリ部や掛け算器の個数は奇数の方が、補正信号の上下対称性は良いが、加算器やラインメモリ部や掛け算器の個数が偶数でも８ヶ以上なら、補正信号の上下対称性のずれはおおよそ１／８と小さく、より多い偶数なら補正信号の上下対称性のずれはより少なく、実用上問題ない。 In the present invention, the number of adders, line memory units, and multipliers is not limited to seven, and may be a natural number of seven or more as long as the circuit scale is allowed. The odd number of adders, line memory units, and multipliers has better vertical symmetry of the correction signal. However, if the number of adders, line memory units, and multipliers is an even number and more than 8, The deviation in symmetry is as small as about 1/8. If the number is even, the deviation in the vertical symmetry of the correction signal is smaller, and there is no practical problem.
また、２３．５μｍ等３３μｍ以下の画素ピッチで水平６４０画素垂直４８０画素と従来のテレビジョンと同等画素以上の遠遠赤外線撮像素子を用いた撮像装置２と、精度がおおよそ１１μｍ以下でかつ絞り値がおおよそ２以下のカルコゲナイド製非球面レンズまたは精度がおおよそ１１μｍ以下でかつ絞り値がおおよそ２以下の反射望遠鏡１とであれば、変調度低下が補正可能な範囲で、本技術で低周波数から輪郭を補正すれば、３００Ｋ付近の温度に比例する８−１４μｍの赤外線を撮像しても、体温と同等温度の背景の１９と体温より高温の背景の１８と、人物６との区別が付き、踏切の進入者の輪郭や形状を検出でき、撮像装置２の映像信号を、侵入者検知や不審行動検出等の移動物体画像処理装置３に入力して処理するだけで良く、監視システムが簡便で安定に、踏切内の進入者を特定できる。また、２３．５μｍ等３３μｍ以下の画素ピッチで水平３２０画素垂直２４０画素の遠赤外線撮像素子を用いた撮像装置２と、精度がおおよそ１１μｍ以下でかつ絞り値がおおよそ２以下のカルコゲナイド製非球面レンズまたは精度がおおよそ１１μｍ以下でかつ絞り値がおおよそ２以下の反射望遠鏡１でも検出精度が向上し、移動物体画像処理装置３での踏切内の進入者の特定が容易となる。絞り値が２以上のレンズまたは絞り値が２以上の反射望遠鏡またはズームレンズでさらに低周波数から低い変調度になっても本技術で低周波数から輪郭を補正すれば、検出精度は低下するが、移動物体画像処理装置３での踏切内の進入者の特定が可能となる。画素ピッチが大きくても本技術で低周波数から輪郭を補正すれば、検出精度は向上する。 In addition, the imaging device 2 using a far-infrared imaging device having a pixel pitch of 23.5 μm or less and a pixel pitch of 33 μm or less, horizontal 640 pixels and vertical 480 pixels and pixels equivalent to or more than those of a conventional television, and an accuracy of approximately 11 μm or less and an aperture value Is a chalcogenide aspherical lens with an accuracy of approximately 2 or less or a reflective telescope 1 with an accuracy of approximately 11 μm or less and an aperture value of approximately 2 or less, it is possible to contour from a low frequency with this technology within a range in which the degree of modulation can be corrected. Is corrected, even if an infrared ray of 8-14 μm proportional to the temperature around 300K is imaged, the background 19 having a temperature equivalent to the body temperature, the background 18 having a temperature higher than the body temperature, and the person 6 can be distinguished. The contour and shape of the intruder can be detected, and the video signal of the imaging device 2 can be input and processed into the moving object image processing device 3 for intruder detection, suspicious behavior detection, etc. The visual system is simple and stable, and it is possible to identify the intruder in the railroad crossing. Also, an imaging device 2 using a far-infrared imaging device having horizontal 320 pixels and vertical 240 pixels at a pixel pitch of 33 μm or less such as 23.5 μm, and an aspherical lens made of chalcogenide having an accuracy of about 11 μm or less and an aperture value of about 2 or less Alternatively, even the reflection telescope 1 having an accuracy of approximately 11 μm or less and an aperture value of approximately 2 or less improves the detection accuracy, and the moving object image processing device 3 can easily identify an intruder in the crossing. Even if the lens has an aperture value of 2 or more, or a reflecting telescope or zoom lens with an aperture value of 2 or more, even if the modulation depth is lowered from a low frequency, if the contour is corrected from the low frequency with this technology, the detection accuracy is reduced. The moving object image processing device 3 can identify an intruder in the railroad crossing. Even if the pixel pitch is large, if the contour is corrected from a low frequency with this technique, the detection accuracy is improved.
また、撮像素子の微細化が進み波長同等の画素ピッチとなったため、波長同等の精度の光学系の収差や光学分解の理論限界による変調度低下が問題になっている撮像装置の実用化や画質改善が容易になる。 In addition, since the image sensor has been miniaturized and the pixel pitch is equivalent to the wavelength, the practical use of the imaging device and the image quality have become problems, such as the aberration of the optical system with the accuracy equivalent to the wavelength and the lowering of the modulation degree due to the theoretical limit of optical decomposition. Improvement becomes easy.
具体的には、２３．５μｍ等３３μｍ以下の画素ピッチの遠赤外線撮像素子であれば、８−１４μｍの遠赤外線光学系の精度がおおよそ１１μｍ以下と、非特許文献３の非球面研磨精度の５μｍ以下より緩和されるため、８−１４μｍのカセグレン反射望遠鏡や補正レンズ付きの球面反射望遠鏡の製作が容易になり、海峡や沿岸の２４時間不審船侵入監視が８−１４μｍの遠赤外線の撮像のみで実現できる。 Specifically, in the case of a far-infrared imaging device having a pixel pitch of 33 μm or less such as 23.5 μm, the accuracy of the 8-14 μm far-infrared optical system is approximately 11 μm or less, and the aspherical polishing accuracy of Non-Patent Document 3 is 5 μm. Because it will be relaxed from the following, it will be easier to manufacture 8-14 μm Cassegrain reflectors and spherical reflector telescopes with correction lenses, and 24-hour suspicious ship intrusion monitoring in the strait and coast will be possible only with 8-14 μm far-infrared imaging. realizable.
さらに、撮像素子の感度に比較して、被写体照度が高く、レンズ等の光学系の絞りを絞り過ぎて光学系の変調度が低くなり過ぎた場合の、低周波数から低い変調度を補う信号処理による補正の工夫である。画質劣化が伴い易い光学絞り中心付近の光量減衰（ＮＤ）フィルタ（スポットＮＤ）なしで、夜間撮影用の高感度カメラの直射日光下でのレンズ絞り過ぎでの画質も改善される。また、放送局やプロダクションハウスに広く普及している撮像素子有効画高５．４ｍｍの交換レンズでの垂直有効画素数４０００画素以上または家電ＨＤＴＶの結像寸法の撮像素子有効画高約３ｍｍで垂直有効画素数２０００画素以上で画素ピッチ１.３５μｍと赤端波長０．７μｍの２倍以下で緑中心波長０．５５μｍの２．４倍となっても、低分散ガラスや蛍石を組み合わせて色収差を低減し、高屈折ガラスや非球面レンズで球面収差やその他収差を低減し、本技術で低周波数から輪郭を補正すれば、高画質での撮像も可能になり、スーパーハイビジョンの実用化が容易になる。絞りＦ２以上の実用領域でさらに低周波数から低い変調度になっても本技術で低周波数から輪郭を補正すれば、高画質での撮像も可能になる。撮像素子有効画高５．４ｍｍの交換レンズでの可視光での垂直有効画素数２０００画素以上水平有効画素数４０００画素以上の４Ｋと呼ばれるビデオ撮影映画の画質も改善される。また、可視光の波長による焦点のずれ（分散）の少なさをアッベ数νdで示すが、蛍石のνdは９５．２で、低分散ガラスのνdは８０から９５である。νdが９０以下のガラスのみ用いる３０倍以上のズームレンズやνdが９５以下のガラスのみ用いる７０倍以上のズームレンズでは、望遠端付近で、収差が残り、低周波数から低い変調度となる。したがって、本技術で低周波数から輪郭を補正すれば、上記ズームレンズの望遠端付近でも高画質での撮像も可能になる。 Furthermore, signal processing that compensates for low modulation from low frequencies when the subject illumination is high compared to the sensitivity of the image sensor and the optical system such as a lens is too narrow and the modulation of the optical system is too low. This is a correction device. Without the light amount attenuation (ND) filter (spot ND) in the vicinity of the center of the optical aperture, which is likely to cause image quality degradation, the image quality of the high sensitivity camera for night photography under the excessive lens aperture is also improved. In addition, the vertical effective pixel number of 4000 pixels or more with an interchangeable lens having an effective image height of 5.4 mm, which is widely used in broadcasting stations and production houses, or an image sensor effective image height of about 3 mm with an imaging size of home appliance HDTV is vertical. Even if the number of effective pixels is 2000 or more, the pixel pitch is 1.35 μm, the red end wavelength is less than 2 times the 0.7 μm, and the green center wavelength is 2.4 times the 0.55 μm. If high-refractive glass and aspherical lenses are used to reduce spherical aberration and other aberrations, and the contour is corrected from this low frequency with this technology, high-quality imaging is possible, and Super Hi-Vision can be easily put to practical use. become. Even if the modulation frequency is lowered from a low frequency in a practical area beyond the aperture F2, if the contour is corrected from the low frequency with the present technology, high-quality imaging can be performed. The image quality of a video shooting movie called 4K having 2000 or more effective pixels in the visible light with an interchangeable lens having an effective image height of 5.4 mm and more than 4000 effective pixels is improved. Further, the small deviation of focus (dispersion) due to the wavelength of visible light is shown by Abbe number νd, νd of fluorite is 95.2, and νd of low dispersion glass is 80 to 95. In a zoom lens of 30 times or more using only glass with νd of 90 or less, or a zoom lens of 70 times or more using only glass with νd of 95 or less, aberration remains in the vicinity of the telephoto end, and the modulation degree is low from a low frequency. Therefore, if the contour is corrected from a low frequency with the present technology, high-quality imaging can be performed even near the telephoto end of the zoom lens.
低価格な撮像素子有効画高約４ｍｍ以下で垂直有効画素数７２０画素以上、特に撮像素子有効画高約３ｍｍ以下で垂直有効画素数２０００画素以上の家電ビデオカメラレコーダの製品化が容易になる。 It is easy to commercialize a consumer-use video camera recorder with a low-priced image sensor effective image height of about 4 mm or less and a vertical effective pixel number of 720 pixels or more, and particularly an image sensor effective image height of about 3 mm or less and a vertical effective pixel number of 2000 pixels or more.
ここで、本発明の他の１実施例の赤外線監視システムの全体構成を示すブロック図の図８と、本発明の他の１実施例の多走査線（Ｈ）垂直輪郭補正／加重平均信号発生回路の詳細ブロック図の図７とを用いて本発明の他の１実施例を説明する。本発明の１実施例の赤外線監視システムの全体構成を示すブロック図の図４と本発明の他の１実施例の赤外線監視システムの全体構成を示すブロック図の図８との相異は、遠赤外光学系１の替わりにガラス光学系１２、遠赤外撮像装置２の替わりに多走査線（Ｈ）垂直輪郭補正／加重平均を含む可視光撮像装置３０があることである。 Here, FIG. 8 is a block diagram showing the overall configuration of an infrared monitoring system according to another embodiment of the present invention, and multi-scan line (H) vertical contour correction / weighted average signal generation according to another embodiment of the present invention. Another embodiment of the present invention will be described with reference to FIG. 7 which is a detailed block diagram of the circuit. 4 is a block diagram showing the overall configuration of the infrared monitoring system of one embodiment of the present invention, and FIG. 8 is a block diagram showing the overall configuration of the infrared monitoring system of another embodiment of the present invention. Instead of the infrared optical system 1, there is a glass optical system 12, and instead of the far infrared imaging device 2, there is a visible light imaging device 30 including multi-scanning line (H) vertical contour correction / weighted average.
また、本発明の１実施例の多走査線（Ｈ）垂直輪郭補正信号発生回路の詳細ブロック図の図１と本発明の他の１実施例の多走査線（Ｈ）垂直輪郭補正／加重平均信号発生回路の詳細ブロック図の図７との相異は、映像レベル判定器２７で正負と増幅度を可変する掛け算器３２だけでなく、小振幅大振幅の圧縮制限器３１が制御されることである。４Ｈ映像信号が所定レベル以下の暗部では、映像レベル判定器２７により、小振幅大振幅の圧縮制限器３１の小振幅の圧縮制限がなくなり、正負と増幅度を可変する掛け算器３２が負極性となり、輪郭補正信号が１／ｆ低周波雑音成分を含む逆極性となり、７Ｈの加重平均（雑音低減）信号として動作し、７Ｈまでの１／ｆ低周波雑音成分を減衰させる。 FIG. 1 is a detailed block diagram of a multi-scan line (H) vertical contour correction signal generation circuit according to one embodiment of the present invention and multi-scan line (H) vertical contour correction / weighted average of another embodiment of the present invention. 7 differs from the detailed block diagram of the signal generation circuit in FIG. 7 in that not only the multiplier 32 that changes the positive / negative and the amplification degree by the video level determination unit 27 but also the compression limiter 31 of small amplitude and large amplitude is controlled. It is. In a dark part where the 4H video signal is below a predetermined level, the video level determination unit 27 eliminates the small amplitude compression limit of the small amplitude and large amplitude compression limiter 31, and the multiplier 32 that changes the positive / negative and the amplification degree becomes negative. The contour correction signal has a reverse polarity including a 1 / f low-frequency noise component, operates as a weighted average (noise reduction) signal of 7H, and attenuates the 1 / f low-frequency noise component up to 7H.
また、４Ｈ映像信号が所定レベル以上の明部では、映像レベル判定器２７により、小振幅大振幅の圧縮制限器３１の小振幅と大振幅との圧縮制限がかかり、正負と増幅度を可変する掛け算器３２が正極性となり、図１と同様に多走査線（Ｈ）輪郭補正信号として動作することである。そして、加算器３３で４Ｈ映像信号に加算し垂直輪郭／加重平均（雑音低減）補正後の映像信号とする。 In a bright part where the 4H video signal is equal to or higher than a predetermined level, the video level determination unit 27 restricts the compression between the small amplitude and the large amplitude of the compression limiter 31 having a small amplitude and a large amplitude, and changes the positive / negative and the amplification degree. The multiplier 32 has a positive polarity and operates as a multi-scanning line (H) contour correction signal as in FIG. Then, it is added to the 4H video signal by the adder 33 to obtain a video signal after vertical contour / weighted average (noise reduction) correction.
また、加算器やラインメモリ部や掛け算器の個数を７ヶ以上の自然数の２Ｎ＋５として、所定の映像信号レベル以上（の明部）では、０から２Ｎ＋５までの整数水平周期分遅らせた複数の各映像信号から垂直輪郭補正信号を発生し、所定の映像信号レベル以下（の暗部）では、０から２Ｎ＋５までの整数水平周期分遅らせた複数の各映像信号の加重平均（雑音低減映像）信号を発生すれば、波長の光学系の絞り値倍の３倍以下の画素ピッチを有する１００万画素以上の固体撮像素子や感度の高い電子増倍ＣＣＤ撮像素子（ＥＭ−ＣＣＤ）やダイナミックレンジが広いＣＭＯＳ撮像素子等付加機能はあるが１／ｆ低周波雑音成分が大きくなり易い固体撮像素子での高感度撮像の画質も改善される。多走査線（Ｈ）垂直輪郭補正により、スポットＮＤなしで、夜間撮影用の高感度カメラの直射日光下でのレンズ絞り過ぎでの画質も改善されることと合わせて、監視カメラの夜間の画質も昼間の画質も改善される。 Further, the number of adders, line memory units and multipliers is a natural number of 2N + 5, which is 7 or more, and a plurality of each delayed by an integer horizontal period from 0 to 2N + 5 above a predetermined video signal level (bright part). A vertical contour correction signal is generated from a video signal, and a weighted average (noise-reduced video) signal of a plurality of video signals delayed by an integer horizontal period from 0 to 2N + 5 is generated below (a dark part of) a predetermined video signal level. If so, a solid-state imaging device with a pixel pitch of 3 times or less of the aperture value multiple of the wavelength optical system, a highly sensitive electron multiplying CCD imaging device (EM-CCD), or a CMOS imaging with a wide dynamic range Although there is an additional function such as an element, the image quality of high-sensitivity imaging with a solid-state imaging device that tends to increase the 1 / f low-frequency noise component is also improved. Multi-scanning line (H) vertical contour correction improves the image quality of the surveillance camera at night, without the spot ND, and also improves the image quality of the high-sensitivity camera for night photography in the direct sunlight, with the lens aperture being too large. Even daytime image quality is improved.
１，１０：カルコゲナイド(S,Se,Te,Ge,As,Sb)等８−１４μｍの遠赤外線透過光学系または反射望遠鏡
２，１１：８−１４μｍの遠赤外線撮像装置、
３，１４：侵入者検知や不審行動検出等の移動物体画像処理装置、
４，１５：映像表示装置（モニタ）、
５，１６：録画装置、
６：移動物体、 ７：背景、
１９：移動物体と同等温度の背景 １８：移動物体より高温な背景、
８：１４ｂｉｔ以上のＡ／Ｄ含む遠赤外撮像部、
９：多走査線（Ｈ）輪郭補正含む映像処理部、
１２：Ａ／Ｄ含む遠赤外撮像部、
１３、３０：可視光撮像装置、
２０〜２６，３３：加算器、２７：映像レベル判定器、
２８：Ａ／Ｄ含む可視光撮像部、
２９：多走査線（Ｈ）垂直輪郭補正／加重平均含む映像処理部、
３１：小振幅大振幅の圧縮制限器、３２：正負と増幅度を可変する掛け算器
Ｍ１〜Ｍ７：ラインメモリ部、
Ｎ１〜Ｎ７：負の掛け算器、Ｐ１、Ｐ４：正の掛け算器、
1, 10: chalcogenide (S, Se, Te, Ge, As, Sb), etc. 8-14 μm far-infrared transmission optical system or reflection telescope 2, 11: 8-14 μm far-infrared imaging device,
3, 14: Moving object image processing device such as intruder detection and suspicious behavior detection,
4, 15: Video display device (monitor),
5, 16: Recording device,
6: moving object, 7: background,
19: Background having the same temperature as the moving object 18: Background having a higher temperature than the moving object,
8: Far-infrared imaging unit including A / D of 14 bits or more,
9: Image processing unit including multi-scan line (H) contour correction,
12: Far-infrared imaging unit including A / D,
13, 30: Visible light imaging device,
20 to 26, 33: adder, 27: video level determination unit,
28: Visible light imaging unit including A / D,
29: Image processing unit including multi-scan line (H) vertical contour correction / weighted average,
31: Compression limiter with small amplitude and large amplitude, 32: Multipliers M1 to M7 that change the positive and negative and amplification degree: Line memory unit,
N1 to N7: negative multiplier, P1, P4: positive multiplier,
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