JPH07177526A - Video signal processor - Google Patents
Video signal processorInfo
- Publication number
- JPH07177526A JPH07177526A JP5320010A JP32001093A JPH07177526A JP H07177526 A JPH07177526 A JP H07177526A JP 5320010 A JP5320010 A JP 5320010A JP 32001093 A JP32001093 A JP 32001093A JP H07177526 A JPH07177526 A JP H07177526A
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- Japan
- Prior art keywords
- edge
- signal
- video signal
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- detected
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Links
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims 4
- 238000003708 edge detection Methods 0.000 abstract description 7
- 239000011159 matrix material Substances 0.000 description 9
- 239000003086 colorant Substances 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Landscapes
- Color Television Image Signal Generators (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は映像信号処理回路に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal processing circuit.
【０００２】[0002]
【従来の技術】従来、単板式カメラ信号処理回路におい
てよく用いられる処理として、マトリクス方式または原
色分離方式と呼ばれるものがある。これは、Ｍｇ，Ｇ
ｒ，Ｃｙ，Ｙｅの４色の補色モザイクフィルタを受光面
に張ったＣＣＤ等の固体撮像素子の信号から、ＲＧＢ３
原色信号の形で表された色情報を得るものである。2. Description of the Related Art Conventionally, a process often used in a single-chip camera signal processing circuit is called a matrix system or a primary color separation system. This is Mg, G
From the signals of the solid-state image sensor such as CCD in which the complementary color mosaic filters of four colors of r, Cy and Ye are stretched on the light receiving surface, RGB3
It obtains color information represented in the form of primary color signals.
【０００３】[0003]
【発明が解決しようとする課題】上記補色モザイクフィ
ルタを用いた従来の技術では、色キャリア周波数と感度
が高いという利点がある一方、色キャリアの振幅が小さ
いという欠点があり、特に上記マトリクス方式で３原色
信号を生成した場合、ＢLのＳ／Ｎが最も悪く、次いで
ＲL，ＧLの順となっており、こうした色によるＳ／Ｎの
差が、広帯域輝度信号を含めた最終的な映像信号の画質
に悪影響を及ぼすという問題があった。The conventional technique using the complementary color mosaic filter has the advantage of high color carrier frequency and high sensitivity, but has the disadvantage of small amplitude of the color carrier. When the three primary color signals are generated, the S / N ratio of B L is the worst, followed by R L and G L , and the S / N difference due to these colors is the final difference including the broadband luminance signal. There is a problem that the image quality of the video signal is adversely affected.
【０００４】[0004]
【課題を解決するための手段及び作用】上記問題点に鑑
み、本発明ではマトリクス方式により求めたＲＧＢ３原
色信号に対して異なる周波数特性のフィルタをかけるこ
とにより、色Ｓ／Ｎを改善する。ただし、上記各ＲＧＢ
信号に対し、異なる周波数特性のフィルタをかけると、
エッジ部分等の高周波領域では偽色が生ずるので、エッ
ジ部分等では上記フィルタをかけずに偽色を生じさせな
いようにする。さらに、上記エッジ部分等の検出にあた
っては、高輝度時は、γ変換前のダイナミックレンジの
広い映像信号から検出し、低照度時は、映像レベルの強
調されるγ変換後の映像信号から検出することにより、
ダイナミックレンジによらずエッジ検出をうまく行える
ようにするものである。なお、上記マトリクス方式によ
り求めたＲＧＢ３原色信号に、広帯域輝度信号を加える
ことにより生成した、疑似的な広帯域ＲＧＢ信号に対し
て、異なる周波数特性のフィルタをかける場合も含むも
のである。In view of the above problems, the present invention improves the color S / N by filtering the RGB three primary color signals obtained by the matrix method with different frequency characteristics. However, each of the above RGB
If you filter the signals with different frequency characteristics,
Since false color is generated in a high frequency area such as an edge portion, the false color is not generated in the edge portion without applying the filter. Further, in detecting the edge portion and the like, when the luminance is high, it is detected from the video signal having a wide dynamic range before the γ conversion, and when the illuminance is low, it is detected from the video signal after the γ conversion in which the image level is emphasized. By
This makes it possible to perform edge detection well regardless of the dynamic range. The pseudo wideband RGB signal generated by adding the wideband luminance signal to the RGB three-primary color signals obtained by the matrix method is also filtered by different frequency characteristics.
【０００５】[0005]
【実施例】図１は、本発明の第１の実施例であり、請求
項（１）〜（４）に関して、単板式カメラ信号処理装置
に適したものである。まず、図１において、１はＣＣＤ
撮像素子、２はＡ／Ｄコンバータ、３は同時化回路、４
はマトリクス、５−１は第１の加算器、５−２は第２の
加算器、５−３は第３の加算器、６は第１の低域通過フ
ィルタ、７は第１の遅延素子、８はエッジ検出手段、９
は第２の低域通過フィルタであり、９−１はＲ、９−２
はＧ、９−３はＢの低域通過フィルタ、１０は９の低域
通過フィルタとの位相差を合わせる第２の遅延素子であ
り、１０−１はＲ、１０−２はＧ、１０−３はＢの遅延
素子、１１はスイッチであり、１１−１はＲ、１１−２
はＧ、１１−３はＢのスイッチ、１２−１はＲ信号出力
端子、１２−２はＧ信号出力端子、１２−３はＢ信号出
力端子である。FIG. 1 shows a first embodiment of the present invention, which is suitable for a single-chip camera signal processing device with respect to claims (1) to (4). First, in FIG. 1, 1 is a CCD
Image sensor 2, 2 A / D converter, 3 synchronization circuit, 4
Is a matrix, 5-1 is a first adder, 5-2 is a second adder, 5-3 is a third adder, 6 is a first low-pass filter, and 7 is a first delay element. , 8 are edge detection means, 9
Is a second low pass filter, 9-1 is R, 9-2
Is G, 9-3 is a B low-pass filter, 10 is a second delay element that matches the phase difference with the 9 low-pass filter, 10-1 is R, 10-2 is G, 10- 3 is a delay element of B, 11 is a switch, 11-1 is R, 11-2
Is a G switch, 11-3 is a B switch, 12-1 is an R signal output terminal, 12-2 is a G signal output terminal, and 12-3 is a B signal output terminal.
【０００６】次に本発明の第１の実施例の動作について
説明する。１のＣＣＤ出力信号は、２のＡ／Ｄコンバー
タによりディジタル化されたのち、３の同時化回路と６
の第１の低域通過フィルタに加えられる。まず、３の同
時化回路では、ＣＣＤ出力信号に含まれる色キャリア成
分から、２つの色差信号ＣR，ＣBおよび狭帯域輝度信号
ＹLが生成される。３の同時化回路が出力したＹL，
ＣR，ＣBは、４のマトリクスで狭帯域３原色信号ＲL，
ＧL，ＢLに変換される。６の第１の低域通過フィルタで
は、前記ＣＣＤ出力信号の色キャリア成分を抑圧した広
帯域輝度信号ＹHが生成され、７の第１の遅延素子と８
のエッジ検出手段に加えられる。７の第１の遅延素子
は、前記ＹHの位相を、同時化とマトリクス演算で余分
に遅延した前記ＲL，ＧL，ＢLの位相に合わせる。５の
加算器は、位相を合わせた前記ＲL，ＧL，ＢLと前記ＹH
を加算して疑似広帯域３原色信号ＲＧＢを生成する。１
１のスイッチの入力端子Ａには９の第２の低域通過フィ
ルタにより帯域制限したＲＧＢが入力され、入力端子Ｂ
には１０の第２の遅延素子により位相調整されただけの
ＲＧＢが入力されている。ここで、９の第２の低域通過
フィルタの遮断周波数は、９−３の低域通過フィルタの
遮断周波数が最も低く、９−２の低域通過フィルタの遮
断周波数を最も高く設定してあるため、Ｂ信号に最も多
く含まれる色ノイズ成分が抑圧される。８のエッジ検出
手段は、前記ＹHからエッジ部分をモニタし、エッジを
検出しない場合には１１のスイッチをＡとし、検出した
場合にはＢとする。したがって画像のエッジが検出され
た場合には９の第２の低域通過フィルタを通らないＲＧ
Ｂ信号が１２の出力端子から出力されるため、エッジ部
分の偽色の発生が抑えられ、画像のエッジが検出されな
ければ、９の第２の低域通過フィルタを通ったＲＧＢ信
号が１２の出力端子から出力されるため、色のＳ／Ｎの
良い画像が得られる。Next, the operation of the first embodiment of the present invention will be described. The CCD output signal of 1 is digitized by the A / D converter of 2 and then the synchronization circuit of 3 and 6
Of the first low pass filter of First, in the third synchronization circuit, two color difference signals C R and C B and a narrow band luminance signal Y L are generated from the color carrier component included in the CCD output signal. Y L output by the synchronization circuit of 3,
C R and C B are four-matrix narrow band three primary color signals R L ,
It is converted into G L and B L. The first low pass filter 6 generates a wide band luminance signal Y H in which the color carrier component of the CCD output signal is suppressed, and the first delay element 7 and 8
Edge detection means. A first delay element 7 adjusts the phase of the Y H to the phases of the R L , G L , and B L which are delayed by the synchronization and the matrix operation. The adder 5 has the phases R L , G L , and B L and the Y H
Are added to generate a pseudo wideband three primary color signal RGB. 1
RGB whose band is limited by the second low pass filter 9 is input to the input terminal A of the switch 1 and input terminal B
RGB of which only the phase has been adjusted by the second delay elements of 10 are input to. Here, the cut-off frequency of the second low-pass filter 9 is set such that the cut-off frequency of the low-pass filter 9-3 is the lowest and the cut-off frequency of the low-pass filter 9-2 is the highest. Therefore, the color noise component most included in the B signal is suppressed. The edge detecting means 8 monitors the edge portion from the Y H, and when the edge is not detected, the switch 11 is set to A, and when it is detected, it is set to B. Therefore, if the edge of the image is detected, the RG that does not pass through the second low pass filter 9
Since the B signal is output from the 12 output terminals, the occurrence of false color at the edge portion is suppressed, and if the edge of the image is not detected, the RGB signal passed through the second low-pass filter 9 is Since the image is output from the output terminal, an image with good color S / N can be obtained.
【０００７】〔他の実施例〕図２は、本発明の第２の実
施例であり、請求項（１）〜（５）に関して、単板式カ
メラ信号処理装置に適用したものである。図２におい
て、１はＣＣＤ撮像素子、２はＡ／Ｄコンバータ、３は
同時化回路、４はマトリクス、５は第１のγ変換回路で
あり、５−１はＲ、５−２はＧ、５−３はＢのγ変換回
路、６−１は第１の加算器、６−２は第２の加算器、６
−３は第３の加算器、７は第１の低域通過フィルタ、８
は第２のγ変換回路、９は第１の遅延素子、１０は広帯
域輝度信号ＹHのレベル検出手段、１１は第１のスイッ
チ、１２はエッジ検出手段、１３は第２の低域通過フィ
ルタであり、１３−１はＲ、１３−２はＧ、１３−３は
Ｂの低域通過フィルタ、１４は１３の低域通過フィルタ
との位相差を合わせる第２の遅延素子であり、１４−１
はＲ、１４−２はＧ、１４−３はＢの遅延素子、１５は
第２のスイッチであり、１５−１はＲ、１５−２はＧ、
１５−３はＢのスイッチ、１６−１はＲ信号出力端子、
６２−２はＧ信号出力端子、１６−３はＢ信号出力端子
である。[Other Embodiments] FIG. 2 shows a second embodiment of the present invention, which is applied to a single-chip type camera signal processing device according to claims (1) to (5). In FIG. 2, 1 is a CCD image pickup device, 2 is an A / D converter, 3 is a synchronization circuit, 4 is a matrix, 5 is a first γ conversion circuit, 5-1 is R, 5-2 is G, 5-3 is a B γ conversion circuit, 6-1 is a first adder, 6-2 is a second adder, 6
-3 is a third adder, 7 is a first low pass filter, 8
Is a second γ conversion circuit, 9 is a first delay element, 10 is a level detecting means for the broadband luminance signal Y H , 11 is a first switch, 12 is edge detecting means, and 13 is a second low pass filter. , 13-1 is R, 13-2 is G, 13-3 is B low-pass filter, 14 is a second delay element for matching the phase difference with the 13 low-pass filter, 14- 1
Is R, 14-2 is G, 14-3 is a delay element of B, 15 is a second switch, 15-1 is R, 15-2 is G,
15-3 is a B switch, 16-1 is an R signal output terminal,
62-2 is a G signal output terminal and 16-3 is a B signal output terminal.
【０００８】次に本発明の第１の実施例の動作について
説明する。１のＣＣＤ出力信号は、２のＡ／Ｄコンバー
タによりディジタル化されたのち、３の同時化回路と７
の第１の低域通過フィルタに加えられる。まず、３の同
時化回路では、ＣＣＤ出力信号に含まれる色キャリア成
分から、２つの色差信号ＣR，ＣBおよび狭帯域輝度信号
ＹLが生成される。３の同時化回路が出力したＹL，
ＣR，ＣBは、４のマトリクスで狭帯域３原色信号ＲL，
ＧL，ＢLに変換され、５の第１のγ変換回路によりγ変
換される。Next, the operation of the first embodiment of the present invention will be described. The CCD output signal of 1 is digitized by the A / D converter of 2 and then the synchronization circuit of 3 and 7
Of the first low pass filter of First, in the third synchronization circuit, two color difference signals C R and C B and a narrow band luminance signal Y L are generated from the color carrier component included in the CCD output signal. Y L output by the synchronization circuit of 3,
C R and C B are four-matrix narrow band three primary color signals R L ,
It is converted into G L and B L , and is gamma converted by the first gamma converter circuit 5.
【０００９】一方、７の第１の低域通過フィルタでは、
前記ＣＣＤ出力信号の色キャリア成分を抑圧した広帯域
輝度信号ＹHが生成され、８の第２のγ変換回路を通じ
て９の第１の遅延素子に加えられる。９の第１の遅延素
子は、前記ＹHの位相を、同時化とマトリクス演算で余
分に遅延した前記ＲL，ＧL，ＢLの位相に合わせる。On the other hand, in the first low pass filter 7
The CCD wideband luminance signal Y H of a color carrier component has been suppressed in the output signal is generated and added to the first delay element 9 through the second γ conversion circuit 8. The first delay element 9 matches the phase of the Y H with the phases of the R L , G L , and B L , which are delayed by the synchronization and the matrix operation.
【００１０】６の加算器は、位相を合わせた前記ＲL，
ＧL，ＢLと前記ＹHを加算して疑似広帯域３原色信号Ｒ
ＧＢを生成する。１５の第２のスイッチの入力端子Ｃに
は１３の第２の低域通過フィルタにより帯域制限したＲ
ＧＢが入力され、入力端子Ｄには１４の第２の遅延素子
により位相調整されただけのＲＧＢが入力されている。
ここで、１３の第２の低域通過フィルタの遮断周波数
は、１３−３の低域通過フィルタの遮断周波数が最も低
く、１３−２の低域通過フィルタの遮断周波数を最も高
く設定してあるため、Ｂ信号に最も多く含まれる色ノイ
ズ成分が抑圧される。The adder of 6 has the phase-matched R L ,
G L , B L and Y H are added to generate a pseudo wideband three primary color signal R
Generate GB. The input terminal C of the 15th second switch has an R band-limited by the 13th second low-pass filter.
GB is input, and RGB whose phase is adjusted by 14 second delay elements is input to the input terminal D.
Here, the cutoff frequency of the second low-pass filter 13 is set such that the cut-off frequency of the low-pass filter 13-3 is the lowest and the cut-off frequency of the low-pass filter 13-2 is the highest. Therefore, the color noise component most included in the B signal is suppressed.
【００１１】８の第２のγ変換回路でγ変換される前の
広帯域輝度信号（図２のＹH1）は、１１の第１のスイッ
チの入力端子Ｂに加えられ、γ変換された後の広帯域輝
度信号（図のＹH2）は、１１の第１のスイッチの入力端
子Ａに加えられる。１１の第１のスイッチは、１０のレ
ベル検出手段の出力により切り換えられる。１０のレベ
ル検出手段は前記ＹH2のレベルが所定の値より小さい場
合には、１１の第１のスイッチがＡ側にＯＮするように
動作し、前記ＹH2のレベルが所定の値以下であれば、１
１の第１のスイッチがＢ側にＯＮするように動作する。
したがって、１２のエッジ検出手段に入力されるＹ
Hは、高輝度の場合にはγ変換前（図のＹH1）、低照度
の場合はγ変換後（図２のＹH2）の信号が入力されるた
め、前記ＹHのダイナミックレンジによらず、エッジ検
出を容易に行うことができる。The wide band luminance signal (Y H1 in FIG. 2) before being gamma converted by the second gamma conversion circuit 8 is applied to the input terminal B of the first switch 11 and is gamma converted. The broadband luminance signal (Y H2 in the figure) is applied to the input terminal A of the eleventh first switch. The first switch of 11 is switched by the output of the level detecting means of 10. When the level of Y H2 is smaller than a predetermined value, the level detecting means 10 operates so that the first switch 11 is turned on to the A side, and the level of Y H2 is below a predetermined value. If 1
The first switch No. 1 operates so as to be turned on to the B side.
Therefore, Y input to the twelve edge detection means
H is before gamma conversion in the case of high luminance (figure Y H1), since the signal after conversion in case of low illuminance gamma (in Y H2 Figure 2) is input, depending on the dynamic range of the Y H Instead, edge detection can be performed easily.
【００１２】１２のエッジ検出手段は、前記ＹH1または
ＹH2からエッジ部分をモニタし、エッジを検出しない場
合には１５スイッチをＣとし、検出した場合にはＤとす
る。したがって画像のエッジが検出された場合には１３
第２の低域通過フィルタを通らないＲＧＢ信号が１６の
出力端子から出力されるため、エッジ部分の偽色の発生
が抑えられ、画像のエッジが検出されなければ、１３の
第２の低域通過フィルタを通ったＲＧＢ信号が１６の出
力端子から出力されるため、色のＳ／Ｎの良い画像が得
られる。The twelve edge detecting means monitors the edge portion from the Y H1 or Y H2 , and sets 15 switches to C when no edge is detected, and sets D to 15 when the edge is detected. Therefore, if an edge of the image is detected,
Since the RGB signal that does not pass through the second low-pass filter is output from the 16 output terminals, the occurrence of false color in the edge portion is suppressed, and if the edge of the image is not detected, the second low-pass signal of 13 is generated. Since the RGB signal that has passed through the pass filter is output from 16 output terminals, an image with good color S / N can be obtained.
【００１３】[0013]
【発明の効果】以上説明したように、本発明によれば、
疑似的な広帯域ＲＧＢ信号を生成した場合において、Ｒ
ＧＢ各信号に対して異なる周波数特性のフィルタをかけ
ることにより、色Ｓ／Ｎが改善され、かつ画像のエッジ
部分等の高周波領域での偽色を抑圧することができる。
さらに、上記エッジ部分等の検出にあたっては、高輝度
時は、γ変換前のダイナミックレンジの広い映像信号か
ら検出し、低照度時は、映像レベルの強調されるγ変換
後の映像信号から検出することにより、ダイナミックレ
ンジによらずエッジ検出がうまく行える。As described above, according to the present invention,
When a pseudo wideband RGB signal is generated, R
By applying filters having different frequency characteristics to each GB signal, the color S / N is improved, and false color in the high frequency region such as the edge portion of the image can be suppressed.
Further, in detecting the edge portion and the like, when the luminance is high, it is detected from the video signal having a wide dynamic range before the γ conversion, and when the illuminance is low, it is detected from the video signal after the γ conversion in which the image level is emphasized. As a result, edge detection can be successfully performed regardless of the dynamic range.
【図１】本発明の第１の実施例を示す図。FIG. 1 is a diagram showing a first embodiment of the present invention.
【図２】本発明の第２の実施例を示す図。FIG. 2 is a diagram showing a second embodiment of the present invention.
Claims (5)
を加算することにより、疑似的な広帯域ＲＧＢ信号を生
成する手段を備えた映像信号処理装置であって、 前記疑似的な広帯域ＲＧＢ信号、あるいは前記狭帯域Ｒ
ＧＢ信号の周波数帯域を所定の帯域に制限する第１のモ
ードと、制限しない第２のモードを備えることを特徴と
する映像信号処理装置。1. A video signal processing device comprising means for generating a pseudo wideband RGB signal by adding a wideband luminance signal to a narrowband RGB signal, wherein the pseudo wideband RGB signal comprises: Alternatively, the narrow band R
A video signal processing device comprising a first mode for limiting a frequency band of a GB signal to a predetermined band and a second mode for not limiting the frequency band.
帯域が、ＲＧＢ各信号で異なることを特徴とする請求項
（１）記載の映像信号処理装置。2. The video signal processing device according to claim 1, wherein in the first mode, the predetermined band is different for each RGB signal.
し、前記画像のエッジ部分を検出する手段の検出結果に
基づいて第１のモードと第２のモードを切り換えること
を特徴とする請求項（１）記載の映像信号処理装置。3. The method according to claim 1, further comprising means for detecting an edge portion of the image, wherein the first mode and the second mode are switched based on a detection result of the means for detecting the edge portion of the image. (1) The video signal processing device as described above.
して、γ変換前の映像信号を用いる第３のモードと、γ
変換後の映像信号を用いる第４のモードを更に備えるこ
とを特徴とする請求項（１）記載の映像信号処理装置。4. A third mode in which a video signal before γ conversion is used as a video signal provided to the edge detecting means, and γ
The video signal processing device according to claim 1, further comprising a fourth mode in which the converted video signal is used.
輝度レベル検出手段の検出結果に基づいて第３のモード
と第４のモードを切り換えることを特徴とする請求項
（１）記載の映像信号処理装置。5. The image according to claim 1, further comprising image brightness level detection means, and switching between the third mode and the fourth mode based on a detection result of the brightness level detection means. Signal processing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32001093A JP3507110B2 (en) | 1993-12-20 | 1993-12-20 | Video signal processing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32001093A JP3507110B2 (en) | 1993-12-20 | 1993-12-20 | Video signal processing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07177526A true JPH07177526A (en) | 1995-07-14 |
| JP3507110B2 JP3507110B2 (en) | 2004-03-15 |
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ID=18116747
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32001093A Expired - Fee Related JP3507110B2 (en) | 1993-12-20 | 1993-12-20 | Video signal processing device |
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| Country | Link |
|---|---|
| JP (1) | JP3507110B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7652701B2 (en) | 2000-03-14 | 2010-01-26 | Fujifilm Corporation | Solid-state honeycomb type image pickup apparatus using a complementary color filter and signal processing method therefor |
-
1993
- 1993-12-20 JP JP32001093A patent/JP3507110B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7652701B2 (en) | 2000-03-14 | 2010-01-26 | Fujifilm Corporation | Solid-state honeycomb type image pickup apparatus using a complementary color filter and signal processing method therefor |
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| Publication number | Publication date |
|---|---|
| JP3507110B2 (en) | 2004-03-15 |
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