JPH04172889A - Signal processor - Google Patents
Signal processorInfo
- Publication number
- JPH04172889A JPH04172889A JP2299932A JP29993290A JPH04172889A JP H04172889 A JPH04172889 A JP H04172889A JP 2299932 A JP2299932 A JP 2299932A JP 29993290 A JP29993290 A JP 29993290A JP H04172889 A JPH04172889 A JP H04172889A
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- circuit
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- brightness
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- 238000001514 detection method Methods 0.000 claims abstract description 41
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 26
- 238000006243 chemical reaction Methods 0.000 abstract description 11
- 230000006835 compression Effects 0.000 abstract description 4
- 238000007906 compression Methods 0.000 abstract description 4
- 210000003127 knee Anatomy 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 18
- 238000000034 method Methods 0.000 description 6
- 239000003086 colorant Substances 0.000 description 4
- 230000000295 complement effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000003595 spectral effect Effects 0.000 description 3
- 230000002596 correlated effect Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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- Color Television Image Signal Generators (AREA)
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Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、カラービデオカメラやカラースチルビデオカ
メラ等の輝度信号処理に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to luminance signal processing for color video cameras, color still video cameras, and the like.
単板式カラー固体撮像装置において、各画素には夫々あ
る特定の色フィルタか装着されており、これらを通して
得られる信号に対して適当な信号処理を施すことにより
最終的に輝度信号Ｙと２種類の色差信号Ｒ−Ｙ、Ｂ−Ｙ
を得ている。In a single-chip color solid-state imaging device, each pixel is equipped with a specific color filter, and by performing appropriate signal processing on the signals obtained through these filters, the final result is a luminance signal Y and two types of filters. Color difference signal R-Y, B-Y
I am getting .
一般に輝度信号Ｙは、例えば第２図の補色フィルタを装
着した撮像素子を用いてインタレース読出しを行う場合
、つぎのようにして得られる。In general, the luminance signal Y is obtained in the following manner when performing interlaced readout using, for example, an image sensor equipped with a complementary color filter as shown in FIG.
即ち、読み出されたマセンタ（Ｍｇ）、クリーン（Ｇｒ
）、シアン（Ｃｙ）、イエロ（Ｙｅ）の４信号に対し相
関二重サンプリング（ＣＤＳ）回路にてリセット雑音を
除去し、自動利得調整（ＡＧＣ）回路で適当にゲイン調
整した後、ガンマ（γ）変換及び高輝度部の白圧縮（ｋ
ｎｅｅ）を行い、最後にローパスフィルタにより帯域制
限を行うことにより得られる。That is, the read macenta (Mg), clean (Gr)
), cyan (Cy), and yellow (Ye), a correlated double sampling (CDS) circuit removes reset noise, an automatic gain adjustment (AGC) circuit performs appropriate gain adjustment, and then gamma (γ ) conversion and white compression of high brightness areas (k
nee) and finally band-limited using a low-pass filter.
しかし、前述の手法により輝度信号を得ようとすると、
水平方向の帯域制限により１水平走査期間（以下ＩＨと
記す）おきに、ＭｇとＧｒを平均化したＹ１信号Ｍ ｇ
十Ｇ ｒと、ｃｙとＹｅを平均化したＹ２信号（：ｙ
＋Ｙｅが得られることになるか、各色フィルタの分光特
性の相違によりＹ）及びＹ２の輝度信号か常に等しくな
るとは限らない。したかって、前記２種類の輝度信号を
そのまま用いて画像を再生すると、ＩＨ毎に明るい輝度
ラインと暗い輝度ラインが生しるいわゆる輝度段差とな
り再生画像の画質を著しく劣化させるという問題が生し
る。このような輝度段差は補色フィルタに限らず、純色
フィルタにおいても発生し、例えば第３図の配列のフィ
ルタでは第４図に示すように、赤（Ｒ）及び青（Ｂ）か
らのもれ込みにより、クリーンＧ１．Ｇ２の分光特性が
微妙に異なるので、この差か輝度段差の発生原因となり
、ＲまたはＢの部分て輝度段差が発生しやすくなり、再
生画像の画質を劣化させてしまう。この問題を鱗状する
ために、
（ｉ）垂直方向の帯域制限による輝度信号の平均化
（ｉｉ）垂直方向の差分信号を垂直アパーチャ（ＶＡＰ
Ｃ）信号として、ヘースクリップ等の一定の振幅制限を
行い、補正前の輝度信号に加える
などの手段が考えられるか、（ｉ）は高周波成分を損い
ゃすくエツジ部分かぼけてしまい、（ｉ ｉ）は振幅制
限のしきい値設定が一定であるため、特定の色に対して
は効果があるが、他の色では振幅制限をかけ過ぎたり、
完全でなかったりするという問題かあった。However, when trying to obtain a luminance signal using the above method,
Due to the horizontal band limitation, the Y1 signal Mg, which is the average of Mg and Gr, is generated every horizontal scanning period (hereinafter referred to as IH).
Y2 signal (:y
However, due to the difference in the spectral characteristics of each color filter, the luminance signals of Y) and Y2 are not always equal. Therefore, if an image is reproduced using the two types of luminance signals as they are, a problem arises in that a bright luminance line and a dark luminance line are generated for each IH, which is a so-called luminance level difference, which significantly deteriorates the quality of the reproduced image. . Such brightness differences occur not only in complementary color filters but also in pure color filters. For example, in the filter with the arrangement shown in Figure 3, as shown in Figure 4, the leakage from red (R) and blue (B) occurs. Clean G1. Since the spectral characteristics of G2 are slightly different, this difference causes the occurrence of a brightness step, and the brightness step is likely to occur in the R or B portion, degrading the quality of the reproduced image. In order to solve this problem, (i) averaging the luminance signal by vertical band limiting (ii) converting the vertical difference signal to vertical aperture (VAP)
C) Is it possible to consider a method such as applying a certain amplitude limit such as hair clipping to the signal and adding it to the luminance signal before correction? (i) would damage the high frequency components and blur the edges, In (i), the threshold setting for amplitude limitation is constant, so it is effective for certain colors, but for other colors it may limit the amplitude too much,
There was a problem that it wasn't perfect.
また輝度段差は、輝度レベルの大小によっても目立ち方
が異なる。すなわち撮像素子から出力された信号は、輝
度信号１合体号ともに、第１０図に示す受像機のカンマ
特性に合わせるために、第１１図のようなガンマ補正が
通常行われているため、撮像素子の出力端ではほとんど
目立たない程度の輝度段差でも、カンマ補正後は低輝度
部の方が高輝度部よりも段差が強調されてしまうという
問題かある。Furthermore, the degree of conspicuousness of the brightness level difference differs depending on the magnitude of the brightness level. In other words, the signals output from the image sensor, together with the luminance signal 1, are normally subjected to gamma correction as shown in Figure 11 in order to match the comma characteristics of the receiver shown in Figure 10. Even if the brightness level difference is barely noticeable at the output end, the problem is that after comma correction, the level difference is more emphasized in low brightness areas than in high brightness areas.
例えば、テレビ受像機の場合、カンマ特性は通常人力信
号Ｉに対して出力信号ＱはＱ＝ １２．２なる特性なの
て、カメラ側でＱ ′＝ １’ ０．４５なるガンマ補
正を行フている。したがって、低輝度部における輝度段
差はガンマ補正後に約３倍程度に強調されることになる
。For example, in the case of a television receiver, the comma characteristic is normally such that the output signal Q is Q = 12.2 with respect to the human input signal I, so it is necessary to perform gamma correction on the camera side so that Q' = 1' 0.45. There is. Therefore, the brightness level difference in the low brightness portion will be emphasized about three times after gamma correction.
本発明は、このような問題を解消するためなされたもの
で、輝度段差の目立たない画像を得ることのできる信号
処理装置を提供することを目的とするものである。The present invention has been made to solve such problems, and an object of the present invention is to provide a signal processing device that can obtain images in which brightness differences are not noticeable.
前記目的を達成するため、本発明では、信号処理装置を
っぎの（１）、（２）、（３）のとおりに構成するもの
である。In order to achieve the above object, the present invention configures a signal processing device as shown in (1), (2), and (3).
（１）撮像素子の出力から輝度信号を生成する輝度信号
生成手段と、前記撮像素子の出力から色信号を生成する
色信号生成手段と、該色信号生成手段の出力にもとづい
て特定色への片寄りを判定する色相判定手段と、前記輝
度信号生成手段内に設けられ、前記色相判定手段の出力
に応じて特性か制御され、輝度段差を除去する輝度段差
除去手段とを備えた信号処理装置。(1) A luminance signal generation means that generates a luminance signal from the output of the image sensor, a color signal generation means that generates a color signal from the output of the image sensor, and a color signal generation means that generates a specific color based on the output of the color signal generation means. A signal processing device comprising: hue determining means for determining offset; and brightness level difference removing means provided in the brightness signal generating means, whose characteristics are controlled according to the output of the hue determining means, and for removing brightness level differences. .
（２）撮像素子の出力から輝度信号を生成する輝度信号
生成手段と、該輝度信号生成手段の信号より所定の輝度
レヘルを検出する輝度レベル検出手段と、前記輝度信号
生成手段内に設けられ、前記輝度レヘル検出手段の出方
に応じて特性が制御され、輝度段差を除去する輝度段差
除去手段とを備えた信号処理装置。(2) a brightness signal generation means for generating a brightness signal from the output of the image sensor, a brightness level detection means for detecting a predetermined brightness level from the signal of the brightness signal generation means, and provided within the brightness signal generation means, A signal processing device comprising a brightness level difference removing unit whose characteristics are controlled according to the output of the brightness level detection unit and which removes a brightness level difference.
（３）撮像素子の出力から輝度信号を生成する輝度信号
生成手段と、前記撮像素子の出力から色信号を生成する
色信号生成手段と、該色信号生成手段の出力にもとづい
て特定色への片寄りを判定する色相判定手段と、前記輝
度信号生成手段内に設けられ、前記色相判定手段の出力
に応じて特性が制御され、輝度段差を除去する第１の輝
度段差除去手段と、前記輝度信号生成手段の信号より所
定の輝度レヘルを検出する輝度レベル検出手段と、前記
輝度信号生成手段内に設けられ、前記輝度レベル検出手
段の出力に応じて特性が制御され、輝度段差を除去する
第２の輝度段差除去手段とを備えた信号処理装置。(3) A luminance signal generation means for generating a luminance signal from the output of the image sensor, a color signal generation means for generating a color signal from the output of the image sensor, and a color signal generation means for generating a specific color based on the output of the color signal generation means. a first luminance level difference removing unit that is provided in the luminance signal generating unit and whose characteristics are controlled according to the output of the hue determining unit and that removes a luminance level difference; a luminance level detection means for detecting a predetermined luminance level from the signal of the signal generation means; and a luminance level detection means provided in the luminance signal generation means, whose characteristics are controlled according to the output of the luminance level detection means, and for removing luminance level differences. 2. A signal processing device comprising a luminance level difference removing means.
前記（１）の構成によれば、特定色への片寄りによる輝
度段差が除去され、前記（２）の構成によれば、所定の
輝度レヘルにおける輝度段差が除去され、（３）の構成
によれば、前記（１）。According to the configuration (1), the brightness level difference due to bias toward a specific color is removed, and according to the configuration (2), the brightness level difference at a predetermined brightness level is removed, and the configuration (3) According to (1) above.
（２）の両方の作用が得られる。Both effects of (2) can be obtained.
Ｃ実施例） 以下本発明を実施例て詳しく説明する。Example C) The present invention will be explained in detail below using examples.
第１図は本発明の第１実施例である°“イに号処理装置
”のブロック図である。FIG. 1 is a block diagram of a first embodiment of the present invention, ie, an "I-signal processing device."
本実施例は、第２図に示す色フィルタを装着した撮像素
子をインタレース走査する場合の例を示す。図示の如く
、レンズ１００を通して撮像素子（ＣＣＤ）１０１上に
結像した画像信号は、ＣＣＤ１．０１からインタレース
走査で一画素毎に読み出され、相関二重サンプリンタ（
ＣＤＳ）回路１０２て撮像素子１０１のリセット雑音が
取り除かれた後、自動利得調整（ＡＧＣ）回路１０３に
よりゲイン調整を行い、輝度信号処理及び色信号処理か
行わわる。 ・
第１図における色信号処理は、自動利得調整回路１０３
の出力が色信号処理回路１０７に入力され、回路１０７
において、通常行われる同時化。This embodiment shows an example in which an image sensor equipped with a color filter shown in FIG. 2 performs interlaced scanning. As shown in the figure, an image signal formed on an image sensor (CCD) 101 through a lens 100 is read out pixel by pixel from the CCD 1.01 using interlaced scanning, and then processed by a correlated double sampler (
After the reset noise of the image sensor 101 is removed by the CDS (CDS) circuit 102, gain adjustment is performed by the automatic gain control (AGC) circuit 103, and luminance signal processing and color signal processing are performed. - The color signal processing in FIG. 1 is performed by the automatic gain adjustment circuit 103.
The output of the circuit 107 is input to the color signal processing circuit 107.
Synchronization that is usually performed in .
ＲＧ Ｂ （ｉ号への変換、ホワイトバランス、カンマ
変換等を行い、最後に色差変換マトリクスにより２種類
の色差信号Ｒ−Ｙ、Ｂ−Ｙ信号が得られる。Conversion to RG B (i number), white balance, comma conversion, etc. are performed, and finally two types of color difference signals R-Y and B-Y signals are obtained by a color difference conversion matrix.
また、自動利得調整回路１０３の出力は、輝度信号処理
を行うために、まずγ及びＫｎｅｅ変換回路１０４に入
力される。回路１０４において、ガンマ変換と高輝度部
の白圧縮が行われた後、ローパスフィルタ１０５にて水
平方向の帯域制限を行い、輝度段差除去回路１０６にて
輝度段差を除去した後、輝度信号Ｙとして出力される。Further, the output of the automatic gain adjustment circuit 103 is first input to a γ and Knee conversion circuit 104 in order to perform luminance signal processing. After gamma conversion and white compression of high brightness areas are performed in the circuit 104, horizontal band limitation is performed in the low-pass filter 105, and after the brightness level difference is removed in the brightness step removal circuit 106, the brightness signal Y is output. Output.
輝度段差除去回路１０６は、色信号処理回路１０７より
出力される色差信号Ｒ−Ｙ及びＢ−Ｙを入力信号とする
色相検出回路１０８の出力信号によってその特性か制御
されている。The characteristics of the brightness level difference removal circuit 106 are controlled by the output signal of the hue detection circuit 108 which receives the color difference signals RY and BY outputted from the color signal processing circuit 107 as input signals.
次に、輝度段差除去回路１０６と色相検出回路１０８の
動作について説明する。輝度段差Ｇ）寺定色（色相）で
目立つので色信号処理回路１０７の出力信号より特定色
への片寄りの検出（判定）を行う。これまでの経験上輝
度段差の特に目立つ色は赤及び青と考えられるので、第
５図で示すＲとＢの位置を第６図で示す色相検出回路に
て検出する。Next, the operations of the luminance step removal circuit 106 and the hue detection circuit 108 will be explained. Since the brightness level difference G) is noticeable in a fixed color (hue), the bias towards a specific color is detected (determined) from the output signal of the color signal processing circuit 107. Based on past experience, it is thought that red and blue are the colors in which brightness steps are particularly noticeable, so the positions of R and B shown in FIG. 5 are detected by the hue detection circuit shown in FIG. 6.
色相検出回路は、第５図において、
Ｒ−Ｙ＞ｒｅｆｔ＞Ｏ，ｒｅｆ２＜Ｂ−Ｙ＜０の条件を
満たすときＲを判断し、
ｒｅｆ３＜Ｒ−Ｙ＜Ｏ，Ｂ−Ｙ＞ｒｅｆ４＞０の条件を
満たすときＢと判断するように構成されている。すなわ
ち、コンパレータ６０１〜６０６において、前記条件を
満たすか否かを判定した後、ケート回路６０７，６０８
にＲ検出、Ｂ検出信号を出力する。また、ゲート回路６
０９の出力には輝度段差除去が必要な色相であるか否か
を色相検出信号として出力する。In FIG. 5, the hue detection circuit determines R when the conditions R-Y>reft>O, ref2<B-Y<0 are satisfied, and ref3<R-Y<O, BY>ref4>0. The configuration is such that it is determined to be B when the following conditions are met. That is, after the comparators 601 to 606 determine whether the above conditions are satisfied, the gate circuits 607 and 608
Outputs R detection and B detection signals. In addition, the gate circuit 6
The output of 09 is a hue detection signal indicating whether or not the hue requires luminance level difference removal.
このようにして得られた色相検出信号は、輝度段差除去
回路１０６に入力され、輝度段差除去のための制御信号
となる。第７（ａ）図の回路構成で輝度段差を除去する
。ローパスフィルタ１０５の出力信号が輝度段差除去回
路１０６に入力されると、垂直アパーチャ（ＶＡＰＣ）
回路７０１ては図示はしないが工Ｈ遅延線を用いてＶＡ
ＰＣ信号を得て、第７（ｂ）図の特性をもつベースク
リップ回路７０２に人力さハる。The hue detection signal obtained in this manner is input to the brightness level difference removal circuit 106 and becomes a control signal for brightness level difference removal. The brightness level difference is removed by the circuit configuration shown in FIG. 7(a). When the output signal of the low-pass filter 105 is input to the luminance step removal circuit 106, the vertical aperture (VAPC)
Although the circuit 701 is not shown, the VA is
The PC signal is obtained and manually applied to the base clip circuit 702 having the characteristics shown in FIG. 7(b).
ベースクリップ回路７０２では、ＶＡＰＣ信号とクリッ
プレベルαとを比較して、いわゆるへ−スフリップ処理
を行う。色相検出信号は、輝度段差の目立つ色相でベー
スクリップが多くかがるように、輝度信号のクリップレ
ベルαを制御する。The base clip circuit 702 compares the VAPC signal with the clip level α and performs so-called head flip processing. The hue detection signal controls the clip level α of the luminance signal so that the base clip is more intense for hues with noticeable luminance steps.
クリップレベルαはあまり大きいレベルに設定すると、
エツジ成分を損う恐わかあるので注意を要する。If clip level α is set too high,
Please be careful as there is a risk of damaging the edge ingredients.
つきに、輝度段差除去手段として第７（ａ）図のベース
クリップ手法のかわりに第８図に示すようなゲイン調整
手法を用いる例を本発明の第２実施例として説明する。A second embodiment of the present invention will now be described in which a gain adjustment method as shown in FIG. 8 is used instead of the base clip method shown in FIG. 7(a) as a brightness level difference removing means.
なお本実施例は、輝度段差除去回路以外は第１実施例と
同様に構成されている。第８図では、入力輝度信号に輝
度段差がある場合は、ＩＨ毎にゲインコントロールアン
プ８０２と何もせずに出力する端子ｅとに切換えて輝度
信号か出力される。ｔｉｔ度段差がない場合は、人力信
号は端子ｅに接続さゎそのまま出力し、端子ｄは端子Ｃ
に接続されゲインコントロールアンプ８０２の入力端を
ある一定電位に保つ。このスイッチ８０１の制御は、Ｉ
Ｈ切換え信号と色相検出信号を人力信号とするゲート回
路８０５の出力信号で行い、輝度段差のある部分たけＩ
Ｈ毎にスイッチを切換えるようにしている。また、ケイ
ンコントロールアンプ８０２のゲインは第６図のＲ検出
信号、Ｂ検出信号を用いて、色毎にゲインを調整して色
により適応的に輝度段差の除去を行っている。Note that this embodiment has the same structure as the first embodiment except for the brightness step removal circuit. In FIG. 8, when there is a brightness level difference in the input brightness signal, the brightness signal is output by switching between the gain control amplifier 802 and the terminal e, which outputs without doing anything, for each IH. If there is no level difference, the human input signal is connected to terminal e and output as is, and terminal d is connected to terminal C.
The input terminal of the gain control amplifier 802 is maintained at a certain constant potential. This switch 801 is controlled by I
The H switching signal and the hue detection signal are performed using the output signal of the gate circuit 805 which uses human input signals, and the partial height I with the luminance step is detected.
The switch is changed every H. Further, the gain of the cane control amplifier 802 is adjusted for each color using the R detection signal and the B detection signal shown in FIG. 6, and brightness level differences are adaptively removed depending on the color.
つぎに、色フィルタとして、第３図に示すような純色タ
イプのフィルタを用いた場合の輝度段差除去の例を本発
明の第３実施例として説明する。Next, as a third embodiment of the present invention, an example of brightness level difference removal when a pure color type filter as shown in FIG. 3 is used as a color filter will be described.
本実施例は第９図のように構成されている。This embodiment is constructed as shown in FIG.
第９図に示すように、レンズ１００を通して色フィルタ
１０１ｂで色分離され、ＣＣＤ １０１上に結像した画
像信号は、インタレース走査で読み出され、ＣＤＳ回路
】ｏ２．自動利得調整回路１０３を経て、輝度信号処理
および色信号処理が行われる。As shown in FIG. 9, the image signals passed through the lens 100, separated by color by the color filter 101b, and imaged on the CCD 101 are read out by interlaced scanning, and then sent to the CDS circuit]o2. Via the automatic gain adjustment circuit 103, luminance signal processing and color signal processing are performed.
色信号処理は、色信号処理回路９０７内において、通Ｔ
Ｃ行われるガンマ変換、ホワイトバランス等の処理が行
わわ、適当な７トリクス処理により色差信号Ｒ−Ｙ、Ｂ
−Ｙを得る。この色差信号Ｒ−Ｙ、Ｂ−Ｙは、補色の場
合と同様、色相検出回路９０６に人力され、第５図に示
すようなヘクトル図でＲまたはＢであるかを判定し、Ｒ
検出信号、Ｂ検出信号の色相検出信号を出力し、ベース
クリップ回路９０４の制御信号とする。Color signal processing is performed within the color signal processing circuit 907.
Processing such as gamma conversion and white balance is performed, and color difference signals R-Y, B are processed by appropriate 7-trix processing.
- Get Y. As in the case of complementary colors, these color difference signals R-Y and B-Y are manually input to the hue detection circuit 906, which determines whether they are R or B using a hector diagram as shown in FIG.
The detection signal and the hue detection signal of the B detection signal are outputted and used as control signals for the base clip circuit 904.
輝度信号処理は、ガンマ変換回路９０１にてガンマ変換
及び高輝度部の白圧縮を行った後、垂直アパーチャ回路
９０２でＶＡＰＣ信号を得、ローパスフィルタ９０３で
垂直方向の適当な帯域制限を行いベースクリップ回路９
０４に人力する。In luminance signal processing, a gamma conversion circuit 901 performs gamma conversion and white compression of high luminance areas, a vertical aperture circuit 902 obtains a VAPC signal, a low-pass filter 903 performs appropriate vertical band limiting, and base clips the signal. circuit 9
Manpower will be provided in 04.
ベースクリップ回路９０４は、先の色相検出信号により
第７（ｂ）図の特性（α）を制御し、画像の色相により
適切なへ〜スフリップ処理を行い加算器９０５の一方の
端子に出力する。加算器９０５のもう一方の端子にはカ
ンマ処理後の輝度段差を含んだ輝度信号が入力されるの
で、色相に応じて適切な処理がなされたベースクリップ
後の輝度信号を加算することで輝度段差のない輝度信号
Ｙを出力端に得ることかできる。The base clipping circuit 904 controls the characteristic (α) shown in FIG. 7(b) based on the hue detection signal, performs an appropriate base flip process depending on the hue of the image, and outputs the result to one terminal of the adder 905. The other terminal of the adder 905 receives a luminance signal including a luminance level difference after comma processing, so the luminance level difference can be reduced by adding the luminance signal after base clipping, which has been appropriately processed according to the hue. It is possible to obtain a luminance signal Y without any brightness at the output end.
本実施例では、輝度段差除去のためにベースクリップ処
理を用いたか、第１実施例と同様にカンマ処理後に第８
図に示すようなＩＨ毎に輝度レベルのゲイン調整を行う
ようにしても良い。In this embodiment, base clip processing was used to remove brightness differences, or the 8th clip was used after comma processing as in the first embodiment.
The brightness level gain adjustment may be performed for each IH as shown in the figure.
なお１以上の各実施例では、色相検出をコンパレータ及
びゲート回路の組み合せで行っているので、ベースクリ
ップ及びアンプゲインをディジタル的にしか制御できな
いが、適当なディスクソート部品を用いてアナログ的に
色相検出を行い、アナログ的にベースクリップ、アンプ
ゲインを制御するようにしてもよい。このとき、輝度段
差の除去はＲまたはＢに限らず任意の色相で行えるよう
に設定し・でもよい。In each of the above embodiments, hue detection is performed using a combination of a comparator and a gate circuit, so the base clip and amplifier gain can only be controlled digitally. The detection may be performed and the base clip and amplifier gain may be controlled in an analog manner. At this time, the brightness level difference may be removed not only with R or B but also with any hue.
また、色相検出回路として、色差信号の代りに、色信号
処理過程のホワイトバランス調整された後のＲＧＢ信号
を用いてもよい。Further, instead of the color difference signal, the RGB signal after white balance adjustment in the color signal processing process may be used as the hue detection circuit.
つきに、輝度レベルの大小で輝度段差の程度が異なるこ
とにＳ目した例を本発明の第４実施例として説明する。Next, an example will be described as a fourth embodiment of the present invention, focusing on the fact that the degree of the luminance step differs depending on the magnitude of the luminance level.
本実施例では、第１２図の構成で輝度段差を除去する輝
度段差除去部以外は第１実施例と同様に構成されている
。第１２図において、１２１は輝度レベル検出回路で、
第１４図のように構成されている。This embodiment has the same structure as the first embodiment except for the luminance level difference removing section that removes the luminance level difference in the configuration shown in FIG. 12. In FIG. 12, 121 is a brightness level detection circuit;
It is configured as shown in FIG.
輝度段差成分を含む輝度信号か第１４図の輝度レベル検
出回路に入力されると、コンパレータ１４１．１４２に
おいて、第１３図に示すような低輝度検出レベルｙＬ及
び高輝度検出レベルｙｈと比較され、輝度段差の目立つ
輝度レベル範囲０〜ｙＬを検出し、第１２図の検出回路
１２１の出力端に出力される。When a luminance signal including a luminance step component is input to the luminance level detection circuit shown in FIG. 14, it is compared with a low luminance detection level yL and a high luminance detection level yh as shown in FIG. 13 in comparators 141 and 142, A brightness level range 0 to yL in which brightness steps are noticeable is detected and output to the output terminal of the detection circuit 121 in FIG. 12.
このレベル検出信号は輝度段差除去Ｆ回路】２２に人力
され、航述したベースクリップ回路（またはＩＨケイン
調整回路）の制御信号としてＩＩＪ御を行う。This level detection signal is inputted to the luminance step removal circuit F 22 and is used as a control signal for the base clip circuit (or IH cane adjustment circuit) described above to perform IIJ control.
このようにして、輝度段差除去回路１２２より出力され
る輝度信号Ｙは、カンマ補正の影響により発生する輝度
段差を除去した輝度信号として出力される。In this way, the luminance signal Y output from the luminance level difference removal circuit 122 is output as a luminance signal from which the luminance level difference caused by the influence of comma correction has been removed.
〔発明の効果）
以上説明したように、本発明によれば、輝度段差の目立
つ色相、輝度範囲のとき輝度段差除去手段の特性が変化
し、輝度段差が目立たなくなる。[Effects of the Invention] As described above, according to the present invention, the characteristics of the brightness step removing means change when the hue and brightness range are such that the brightness step is noticeable, and the brightness step becomes less noticeable.
第１図は本発明の第１実施例のブロック図、第２図は補
色フィルタの配列例を示す図、第３図は純色フィルタの
配列例を示す図、第４図は純色フィルタの緑の分光特性
図、第５図は輝度段差の目立つ特定色の位置を示す図、
第６図は色相検出回路の回路図、第７（ａ）図は第１実
施例のａｍ段差除去回路のブロック図、第７（ｂ）図は
ベースクリップ回路の特性図、第８図は本発明の第２実
施例の輝度段差除去回路のブロック図、第９図は本発明
の第３実施例のブロック図、第１０図は受像機のカンマ
特性図、第１１図はカメラのカンマ補正特性図、第１２
図は本発明の第４実施例の要部のブロック図、第１３図
は輝度レベル検出回路の説明図、第１４図は輝度レベル
検出回路の回路図である。
１０６−・・・・・輝度段差除去回路
１０８・・・・・・色相検出回路FIG. 1 is a block diagram of the first embodiment of the present invention, FIG. 2 is a diagram showing an example of the arrangement of complementary color filters, FIG. 3 is a diagram showing an example of the arrangement of pure color filters, and FIG. 4 is a diagram showing an example of the arrangement of pure color filters. Spectral characteristic diagram, Figure 5 is a diagram showing the position of a particular color with noticeable brightness step,
Fig. 6 is a circuit diagram of the hue detection circuit, Fig. 7(a) is a block diagram of the am step removal circuit of the first embodiment, Fig. 7(b) is a characteristic diagram of the base clip circuit, and Fig. 8 is a block diagram of the am step removal circuit of the first embodiment. FIG. 9 is a block diagram of a brightness step removal circuit according to a second embodiment of the invention, FIG. 9 is a block diagram of a third embodiment of the invention, FIG. 10 is a comma characteristic diagram of a receiver, and FIG. 11 is a comma correction characteristic of a camera. Figure, 12th
FIG. 13 is a block diagram of a main part of a fourth embodiment of the present invention, FIG. 13 is an explanatory diagram of a luminance level detection circuit, and FIG. 14 is a circuit diagram of the luminance level detection circuit. 106-... Luminance step removal circuit 108... Hue detection circuit
Claims (3)
生成手段と、前記撮像素子の出力から色信号を生成する
色信号生成手段と、該色信号生成手段の出力にもとづい
て特定色への片寄りを判定する色相判定手段と、前記輝
度信号生成手段内に設けられ、前記色相判定手段の出力
に応じて特性が制御され、輝度段差を除去する輝度段差
除去手段とを備えたことを特徴とする信号処理装置。(1) A luminance signal generation means that generates a luminance signal from the output of the image sensor, a color signal generation means that generates a color signal from the output of the image sensor, and a color signal generation means that generates a specific color based on the output of the color signal generation means. The present invention is characterized by comprising a hue determining means for determining deviation, and a brightness level difference removing means provided in the brightness signal generating means, whose characteristics are controlled according to the output of the hue determining means, and for removing a brightness level difference. signal processing device.
生成手段と、該輝度信号生成手段の信号より所定の輝度
レベルを検出する輝度レベル検出手段と、前記輝度信号
生成手段内に設けられ、前記輝度レベル検出手段の出力
に応じて特性が制御され、輝度段差を除去する輝度段差
除去手段とを備えたことを特徴とする信号処理装置。(2) a brightness signal generation means for generating a brightness signal from the output of the image sensor, a brightness level detection means for detecting a predetermined brightness level from the signal of the brightness signal generation means, and provided within the brightness signal generation means, A signal processing device characterized in that the signal processing device comprises a brightness level difference removing unit whose characteristics are controlled according to the output of the brightness level detection unit and which removes a brightness level difference.
生成手段と、前記撮像素子の出力から色信号を生成する
色信号生成手段と、該色信号生成手段の出力にもとづい
て特定色への片寄りを判定する色相判定手段と、前記輝
度信号生成手段内に設けられ、前記色相判定手段の出力
に応じて特性が制御され、輝度段差を除去する第１の輝
度段差除去手段と、前記輝度信号生成手段の信号より所
定の輝度レベルを検出する輝度レベル検出手段と、前記
輝度信号生成手段内に設けられ、前記輝度レベル検出手
段の出力に応じて特性が制御され、輝度段差を除去する
第２の輝度段差除去手段とを備えたことを特徴とする信
号処理装置。(3) A luminance signal generation means for generating a luminance signal from the output of the image sensor, a color signal generation means for generating a color signal from the output of the image sensor, and a color signal generation means for generating a specific color based on the output of the color signal generation means. a first luminance level difference removing unit that is provided in the luminance signal generating unit and whose characteristics are controlled according to the output of the hue determining unit and that removes a luminance level difference; a luminance level detection means for detecting a predetermined luminance level from the signal of the signal generation means; and a luminance level detection means provided in the luminance signal generation means, whose characteristics are controlled according to the output of the luminance level detection means, and for removing luminance steps. 2. A signal processing device comprising: 2 brightness level difference removing means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02299932A JP3094231B2 (en) | 1990-11-07 | 1990-11-07 | Signal processing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02299932A JP3094231B2 (en) | 1990-11-07 | 1990-11-07 | Signal processing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04172889A true JPH04172889A (en) | 1992-06-19 |
| JP3094231B2 JP3094231B2 (en) | 2000-10-03 |
Family
ID=17878678
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|---|---|---|---|
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7656431B2 (en) | 2002-04-08 | 2010-02-02 | Panasonic Corporation | Video signal processing apparatus and video signal processing method |
-
1990
- 1990-11-07 JP JP02299932A patent/JP3094231B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7656431B2 (en) | 2002-04-08 | 2010-02-02 | Panasonic Corporation | Video signal processing apparatus and video signal processing method |
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| Publication number | Publication date |
|---|---|
| JP3094231B2 (en) | 2000-10-03 |
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