JPH0870466A - Contour correcting device - Google Patents
Contour correcting deviceInfo
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- JPH0870466A JPH0870466A JP6205129A JP20512994A JPH0870466A JP H0870466 A JPH0870466 A JP H0870466A JP 6205129 A JP6205129 A JP 6205129A JP 20512994 A JP20512994 A JP 20512994A JP H0870466 A JPH0870466 A JP H0870466A
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- adder
- interpolation
- contour
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- Processing Of Color Television Signals (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は輪郭補正装置に関し、特
にモザイク状の色フィルタを備えた全画素読み出し固体
撮像素子を用いた、固体撮像装置に用いられる輪郭補正
装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contour correction device, and more particularly to a contour correction device used in a solid-state image pickup device using an all-pixel readout solid-state image pickup device having a mosaic color filter.
【０００２】[0002]
【従来の技術】従来よく用いられている固体撮像素子の
駆動方式として、垂直方向２画素の信号を加算して読み
出すＰＤミックス方式がある。この方式の固体撮像素子
を用いた撮像方式の例として、色差順次方式がある。図
４に色差順次方式に用いられる色フィルタ配列を示す。
この色フィルタ配列では、任意の縦２×横２画素領域の
信号を加算した信号がMg＋G＋Ye＋Cyとなり、これを輝
度信号とみなして輝度信号処理を行う。即ち、色のキャ
リアを抑圧するために、ローパスフィルタ処理を施して
輝度信号を得ている。しかし、ローパスフィルタ処理は
キャリア抑圧と同時に輝度の高域成分を抑圧してしまう
ので解像度の劣化要因となる。2. Description of the Related Art As a drive system of a solid-state image pickup device which has been often used conventionally, there is a PD mix system in which signals of two pixels in the vertical direction are added and read. An example of an image pickup method using the solid-state image pickup element of this method is a color difference sequential method. FIG. 4 shows a color filter array used in the color difference sequential method.
In this color filter array, a signal obtained by adding signals of arbitrary vertical 2 × horizontal 2 pixel regions becomes Mg + G + Ye + Cy, and this is regarded as a luminance signal, and luminance signal processing is performed. That is, in order to suppress color carriers, low-pass filter processing is performed to obtain a luminance signal. However, the low-pass filtering process suppresses the high-frequency component of the brightness at the same time as suppressing the carrier, which causes a deterioration in resolution.
【０００３】また、例えばYeの色分離フィルタに対応す
る信号は、水平方向１画素おきにしか得られない等、各
色信号の空間サンプリング間隔がCCDの画素間隔より長
くなる。そのため、画像の高域成分の折り返し成分が、
色、輝度の偽信号として発生し、解像度を劣化させる要
因となる。Further, for example, a signal corresponding to the Ye color separation filter can be obtained only every other pixel in the horizontal direction, and the spatial sampling interval of each color signal is longer than the pixel interval of the CCD. Therefore, the folding component of the high frequency component of the image is
It is generated as a false signal of color and luminance, and becomes a factor that deteriorates the resolution.
【０００４】この問題を解決する一方法として、特願平
５−１４４６０５号に記載の方法がある。この方法で
は、例えば図２に示すような配列を繰り返しの単位とす
る色フィルタを備えた全画素読み出しCCDを用い、注目
画素の周辺の信号に対して２次元周波数特性処理を施し
て得られた色の低域信号の比を、注目画素の信号に乗算
することによって、注目画素の位置における複数の色信
号を得る。それによって、各色信号のサンプリング間隔
を見かけ上短くして、モアレを抑圧する。As a method for solving this problem, there is a method described in Japanese Patent Application No. 5-144605. In this method, for example, an all-pixel readout CCD equipped with a color filter having an array as a repeating unit as shown in FIG. 2 is used, and it is obtained by performing a two-dimensional frequency characteristic process on a signal around a pixel of interest. By multiplying the signal of the pixel of interest by the ratio of the low-frequency signals of the colors, a plurality of color signals at the position of the pixel of interest are obtained. Thereby, the sampling interval of each color signal is apparently shortened to suppress moire.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記し
た方法では、色の比を計算し、その比を注目画素の信号
に乗算するため、補間演算のために除算、乗算器が必要
となり、回路規模が大きくなる。同時に補間演算処理を
行う信号の数は少なくする必要がある。However, in the above method, since the color ratio is calculated and the signal of the pixel of interest is multiplied, the division and the multiplier are required for the interpolation calculation, and the circuit scale is increased. Grows larger. At the same time, it is necessary to reduce the number of signals for which interpolation calculation processing is performed.
【０００６】本発明は上記従来技術の問題点を解決し、
小回路規模でモアレの少ない輪郭信号を得られる輪郭補
正装置を提供することを目的とするものである。The present invention solves the above problems of the prior art,
It is an object of the present invention to provide a contour correction device capable of obtaining a contour signal with small moire and a small circuit scale.
【０００７】[0007]
【課題を解決するための手段】上記した目的を達成する
ために、本発明の輪郭補正装置では、二次元の繰り返し
配列を持つ４種類の色フィルタＣ１、Ｃ２、Ｃ３、Ｃ４
を備えた全画素読み出し固体撮像素子から各色フィルタ
に対応した色信号ＣＳ１、ＣＳ２、ＣＳ３、ＣＳ４を出
力し、前記色信号を補間演算手段及び加算器に入力し、
前記補間演算手段において、色フィルタＣ１、Ｃ２、Ｃ
３、Ｃ４の位置にそれぞれ色フィルタＣ２、Ｃ１、Ｃ
４、Ｃ３を配置した際に出力されるべき補間信号ＣＳ
２’、ＣＳ１’、ＣＳ４’、ＣＳ３’を生成して前記加
算器に入力し、前記加算器において各画素に対してＣＳ
１’＋ＣＳ２又はＣＳ１＋ＣＳ２’又はＣＳ３’＋ＣＳ
４又はＣＳ３＋ＣＳ４’を演算し、輝度信号として高域
強調手段へ入力し、前記高域強調手段において高域強調
周波数特性処理を施すことにより輪郭信号を生成する構
成をとっている。In order to achieve the above object, in the contour correcting apparatus of the present invention, four types of color filters C1, C2, C3, C4 having a two-dimensional repeating array are provided.
A color signal CS1, CS2, CS3, CS4 corresponding to each color filter is output from the all-pixel reading solid-state image sensor including the color signal, and the color signal is input to an interpolation calculation unit and an adder,
In the interpolation calculation means, color filters C1, C2, C
Color filters C2, C1 and C at positions C3 and C4, respectively.
Interpolation signal CS to be output when C4 and C3 are arranged
2 ′, CS1 ′, CS4 ′, CS3 ′ are generated and input to the adder, and CS is added to each pixel in the adder.
1 '+ CS2 or CS1 + CS2' or CS3 '+ CS
4 or CS3 + CS4 'is calculated and input to the high frequency emphasizing means as a luminance signal, and high frequency emphasizing frequency characteristic processing is performed in the high frequency emphasizing means to generate a contour signal.
【０００８】[0008]
【作用】本発明は上記構成により、撮像素子の出力信号
と補間演算によって得た信号を各画素毎に加算した信号
を輝度信号とすることにより、小回路規模で偽信号の少
ない輪郭信号を得ることとなる。According to the present invention, with the above configuration, a signal obtained by adding the output signal of the image pickup device and the signal obtained by the interpolation calculation for each pixel is used as a luminance signal, thereby obtaining a contour signal having a small circuit scale and few false signals. It will be.
【０００９】[0009]
【実施例】以下、本発明の実施例について、図面を参照
しながら説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１０】（実施例１）図１に本発明の輪郭補正装置
の一実施例のブロック図を示す。図において、１は全画
素読み出し固体撮像素子、２，３，４は一水平走査期間
遅延素子、５は補間演算手段、６、７は加算器、８は減
算器、９は水平方向ローパスフィルタ、１０は垂直方向
輪郭信号出力、１１は水平方向輪郭信号出力、１２は水
平方向ハイパスフィルタ（高域強調手段）、１３は色信
号処理手段、２０は垂直方向ハイパスフィルタ（高域強
調手段）である。図２は全画素読み出し撮像素子１に用
いる色フィルタ配列の例である。図２において、W、G、
Ye、Cyはそれぞれ全色透過フィルタ、緑色透過フィル
タ、黄色透過フィルタ、シアン色透過フィルタを示して
いる。(Embodiment 1) FIG. 1 shows a block diagram of an embodiment of the contour correcting apparatus of the present invention. In the figure, 1 is an all-pixel readout solid-state image pickup device, 2, 3 and 4 are delay elements for one horizontal scanning period, 5 is interpolation calculation means, 6 and 7 are adders, 8 is a subtractor, 9 is a horizontal low-pass filter, Reference numeral 10 is a vertical direction contour signal output, 11 is a horizontal direction contour signal output, 12 is a horizontal direction high-pass filter (high-frequency enhancing means), 13 is a color signal processing means, and 20 is a vertical high-pass filter (high-frequency enhancing means). . FIG. 2 is an example of a color filter array used in the all-pixel readout image sensor 1. In FIG. 2, W, G,
Ye and Cy represent an all-color transmission filter, a green transmission filter, a yellow transmission filter, and a cyan transmission filter, respectively.
【００１１】全画素読み出し固体撮像素子１の出力信号
は一水平走査期間遅延素子２，３，４を経て、水平５ラ
イン分の信号が色信号処理手段１３へ入力される。ま
た、走査中のラインに対応する信号が補間演算手段５へ
入力される。補間演算手段５においては、特願平５−１
４４６０５号に記載の方法に従って、補間演算が行われ
る。すなわち、色信号処理手段１３において、走査中の
画素及びその周囲の画素を用いた、２次元周波数特性処
理（例えば２次元ローパスフィルタ処理）により生成さ
れるモアレの少ない色信号ＷＬ、ＧＬ、ＹｅＬ、ＣｙＬ
の比を用いて、例えば次式のような補間演算が行われ
る。The output signal of the all-pixel readout solid-state image pickup device 1 is passed through one horizontal scanning period delay element 2, 3 and 4 and a signal for five horizontal lines is input to the color signal processing means 13. In addition, a signal corresponding to the line being scanned is input to the interpolation calculation means 5. In the interpolation calculation means 5, Japanese Patent Application No. 5-1
The interpolation calculation is performed according to the method described in No. 44605. That is, in the color signal processing means 13, the color signals WL, GL, and YeL with less moire generated by the two-dimensional frequency characteristic processing (for example, two-dimensional low-pass filter processing) using the pixel being scanned and the pixels around it. CyL
An interpolation calculation such as the following equation is performed using the ratio of
【００１２】 Ｗ’ ＝ ＷＬ／ＧＬ × Ｇ Ｇ’ ＝ ＧＬ／ＷＬ × Ｗ Ｙｅ’ ＝ ＹｅＬ／ＣｙＬ × Ｃｙ Ｃｙ’ ＝ ＣｙＬ／ＹｅＬ × Ｙｅ・・・・（１） その結果、走査中の画素の補色信号W,G,又はYe,Cy信号
に対してそれぞれ補間信号G', W'又は Cy', Ye'が演算
される。走査中の画素の補色信号と補間信号とは加算器
６において加算される。従って、加算器６からは、W+G'
又は、W'+G又は、Ye+Cy'又はYe'+Cy信号が出力される。
ここで、W+G = Ye+Cy （= r+2g+b）であると考えられる
ので、W+G'、W'+G、Ye+Cy'、Ye'+Cyを輝度信号と考える
と、走査中の１ラインの画素全てにおいて輝度信号が得
られることになる。この信号が、水平方向ハイパスフィ
ルタ１２へ入力され、端子１１より水平方向輪郭信号が
出力される。W ′ = WL / GL × GG ′ = GL / WL × W Ye ′ = YeL / CyL × Cy Cy ′ = CyL / YeL × Ye (1) As a result, the pixel being scanned is scanned. Interpolation signals G ', W'or Cy', Ye 'are calculated for the complementary color signals W, G or Ye, Cy signals, respectively. The complementary color signal of the pixel being scanned and the interpolation signal are added in the adder 6. Therefore, from the adder 6, W + G '
Alternatively, a W '+ G or Ye + Cy' or Ye '+ Cy signal is output.
Here, it is considered that W + G = Ye + Cy (= r + 2g + b), so if we consider W + G ', W' + G, Ye + Cy ', Ye' + Cy as luminance signals, , Luminance signals can be obtained for all pixels on one line during scanning. This signal is input to the horizontal high-pass filter 12, and a horizontal contour signal is output from the terminal 11.
【００１３】次に、垂直方向の輪郭信号を得る方法を説
明する。垂直方向の輪郭信号を得る為にここでは、次式
のような伝達を持つフィルタを用いることを考える。Next, a method for obtaining the contour signal in the vertical direction will be described. In order to obtain the contour signal in the vertical direction, it is considered here to use a filter having the following transfer.
【００１４】 FV(z) = (-1+2zv -1-zv -2)(1+z-1) = 2zv -1(1+z-1) - (1+zv -2)(1+z-1) ・・・（２） （２）式の中で、z-1は一画素遅延を、zv -1は水平１ラ
イン遅延を、zv -2は水平２ライン遅延を示している。即
ち、走査中の画素信号の２倍から、走査中の画素の上下
の信号を減算した後、水平方向に隣接する信号を加算す
るローパスフィルタ処理を行うことにより、垂直方向の
輪郭信号を得られる。このとき、フィルタ処理の為に用
いる３ライン分の信号全てに対して補間演算を行っても
よいが、その場合、補間演算のための回路が大きくな
る。ところで、（２）式のフィルタの右辺第二項の部分
は、走査中のラインに隣接する上下２ライン、水平方向
２画素の信号を加算するローパスフィルタになってい
る。このローパスフィルタによってモアレ等の偽信号が
抑圧されるので、走査中のラインの上下２ラインについ
ては、補間演算を行わなくても比較的偽信号の少ない信
号を得られる。図１では走査中のラインの上下２ライン
の信号が、加算器７で加算され、減算器８において、走
査中のラインの補色信号と補間信号の和から、加算器７
の出力を減算した信号に対して、水平方向ローパスフィ
ルタ９において、隣接する２画素を加算するローパスフ
ィルタ処理を施すことによって、（２）式の特性をもつ
垂直方向ハイパスフィルタを実現している。ローパスフ
ィルタ９を介して端子１０より垂直方向輪郭信号が出力
される。FV (z) = (-1 + 2z v -1 -z v -2 ) (1 + z -1 ) = 2z v -1 (1 + z -1 )-(1 + z v -2 ) (1 + z -1 ) ... (2) In the formula (2), z -1 is one pixel delay, z v -1 is horizontal 1 line delay, and z v -2 is horizontal 2 line delay. Is shown. That is, a vertical contour signal can be obtained by subtracting the signals above and below the pixel being scanned from twice the pixel signal being scanned, and then performing a low-pass filter process that adds horizontally adjacent signals. . At this time, the interpolation calculation may be performed on all the signals of three lines used for the filter processing, but in that case, the circuit for the interpolation calculation becomes large. By the way, the portion of the second term on the right side of the filter of the equation (2) is a low-pass filter that adds signals of two pixels in the upper and lower lines and two pixels in the horizontal direction adjacent to the line being scanned. Since a false signal such as moire is suppressed by this low-pass filter, a signal with a relatively small number of false signals can be obtained for the upper and lower two lines of the scanning line without performing the interpolation calculation. In FIG. 1, the signals of the upper and lower two lines of the line being scanned are added by the adder 7, and the subtractor 8 calculates the sum of the complementary color signal and the interpolation signal of the line being scanned from the adder 7
The horizontal low-pass filter 9 performs a low-pass filter process for adding two adjacent pixels to the signal obtained by subtracting the output of (1) to realize a vertical high-pass filter having the characteristic of Expression (2). A vertical contour signal is output from the terminal 10 via the low-pass filter 9.
【００１５】（実施例２）W+GとYe+Cyの分光特性が一致
しない場合には、図１の様な方法で輪郭信号を作ると、
W+G’、G’+Wの信号と、Ye+Cy'又はYe'+Cy信号の差によ
って、フリッカが発生する。これを抑圧するには、垂直
方向にＬＰＦ処理を行えばよい。図３にその場合の実施
例を示す。図３において、１４は水平走査期間遅延手
段、１５，１６，１７は加算器、１８は補間演算手段を
示す。なお、本実施例において、図１と同一の符号を付
したものについては、図１の構成要素と同一の機能を持
つものであるので、説明を省略する。(Embodiment 2) When the spectral characteristics of W + G and Ye + Cy do not match, a contour signal is created by the method shown in FIG.
Flicker occurs due to the difference between the W + G 'and G' + W signals and the Ye + Cy 'or Ye' + Cy signals. In order to suppress this, LPF processing may be performed in the vertical direction. FIG. 3 shows an embodiment in that case. In FIG. 3, reference numeral 14 is a horizontal scanning period delay means, 15, 16, 17 are adders, and 18 is an interpolation calculation means. Note that, in the present embodiment, those denoted by the same reference numerals as those in FIG. 1 have the same functions as the constituent elements in FIG.
【００１６】まず、この例での水平方向の輪郭信号を得
る方法を示す。全画素読み出し固体撮像素子１の出力信
号は一水平走査期間遅延素子２，３，４，１４を経て、
６ライン分の信号が色信号生成手段１３へ入力され、そ
の出力は補間演算に使われる。また、走査中のラインと
その下方に隣接するラインの信号が、補間演算手段５，
１８へ入力され、補間演算処理を施された後、出力され
た補間信号G', W', Cy', Ye'と補色信号W, G, Ye, Cyが
加算器６，１６において加算される。加算器６，１６の
出力は加算器１５において更に加算される。その結果、
加算器１５の出力には、走査中の画素とその下方に隣接
する画素に対応する、補色信号と補間信号の和であるW+
G'+Ye+Cy'又はW'+G+Ye+Cy'又はW+G'+Ye'+Cy又はW'+G+Y
e'+Cy信号が得られる。この信号は、４色の信号すべて
揃っており、W+GとYe+Cyの分光特性の不一致によるフリ
ッカのない信号になっている。加算器１５の出力が水平
方向ハイパスフィルタ１２へ入力され、水平方向ハイパ
スフィルタ１２を介して端子１１より、偽信号の少ない
水平方向輪郭信号が出力される。First, a method of obtaining a horizontal contour signal in this example will be described. The output signal of the all-pixel readout solid-state imaging device 1 is passed through delay elements 2, 3, 4, and 14 for one horizontal scanning period,
The signals for 6 lines are input to the color signal generating means 13, and the output thereof is used for interpolation calculation. In addition, the signals of the line being scanned and the lines adjacent to the line below are interpolated by the interpolation calculation means 5, 5.
After being input to 18 and subjected to interpolation calculation processing, the output interpolation signals G ', W', Cy ', Ye' and complementary color signals W, G, Ye, Cy are added in adders 6 and 16. . The outputs of the adders 6 and 16 are further added in the adder 15. as a result,
The output of the adder 15 is W + which is the sum of the complementary color signal and the interpolation signal corresponding to the pixel being scanned and the pixel adjacent to the pixel being scanned.
G '+ Ye + Cy' or W '+ G + Ye + Cy' or W + G '+ Ye' + Cy or W '+ G + Y
The e '+ Cy signal is obtained. This signal has all four color signals and is a signal without flicker due to the mismatch of the spectral characteristics of W + G and Ye + Cy. The output of the adder 15 is input to the horizontal high-pass filter 12, and the horizontal contour signal with few false signals is output from the terminal 11 via the horizontal high-pass filter 12.
【００１７】次に、垂直方向の輪郭信号を得る方法につ
いて述べる。走査中のラインと、その下方に隣接するラ
インの補間信号W',G'とYe', Cy'が、加算器８において
加算される。また、走査中のラインの上方に隣接するラ
インと、走査中のラインの下方２つめのラインの補色信
号が、加算器７において加算される。そして、減算器８
において、加算器１７の出力から、加算器７の出力が減
算され、ローパスフィルタ９へ出力される。ローパスフ
ィルタ９に於て、例えば隣接画素を加算する水平方向ロ
ーパスフィルタ処理を施すと、出力に偽信号の少ない垂
直方向輪郭信号が得られる。Next, a method for obtaining a vertical contour signal will be described. The adder 8 adds the interpolated signals W ′, G ′ and Ye ′, Cy ′ of the line being scanned and the line adjacent to the line below. The adder 7 adds the complementary color signals of the line adjacent above the line being scanned and the second line below the line being scanned. And the subtractor 8
At, the output of the adder 7 is subtracted from the output of the adder 17, and the result is output to the low-pass filter 9. In the low-pass filter 9, for example, when horizontal low-pass filter processing for adding adjacent pixels is performed, a vertical contour signal with few false signals is obtained at the output.
【００１８】なお、上記した第１、第２の実施例では、
色フィルタＣ１、Ｃ２、Ｃ３、Ｃ４としてW,G,Ye,Cyを
用いたが、Mg（マゼンタ色透過フィルタ）,G,Ye,Cyを用
いても構わない。In the first and second embodiments described above,
Although W, G, Ye, and Cy are used as the color filters C1, C2, C3, and C4, Mg (magenta color transmission filter), G, Ye, and Cy may be used.
【００１９】[0019]
【発明の効果】以上に述べたように、本発明によれば、
二次元の繰り返し配列を持つ４種類の色フィルタＣ１、
Ｃ２、Ｃ３、Ｃ４を備えた全画素読み出し固体撮像素子
から各色フィルタに対応した補色信号ＣＳ１、ＣＳ２、
ＣＳ３、ＣＳ４を出力し、この補色信号を補間演算手段
及び加算器に入力し、補間演算手段において、色フィル
タＣ１、Ｃ２、Ｃ３、Ｃ４の位置にそれぞれ色フィルタ
Ｃ２、Ｃ１、Ｃ４、Ｃ３を配置した際に出力されるべき
補間信号ＣＳ２’、ＣＳ１’、ＣＳ４’、ＣＳ３’を生
成し、これを前記した加算器に入力し、前記加算器にお
いて各画素に対してＣＳ１’＋ＣＳ２又はＣＳ１＋ＣＳ
２’又はＣＳ３’＋ＣＳ４又はＣＳ３＋ＣＳ４’を演算
し、輝度信号として高域強調手段へ入力し、前記高域強
調手段において高域強調周波数特性処理を施すことによ
り輪郭信号を生成しており、各画素に対して演算される
補間信号と補色信号の和を輝度信号として輝度の輪郭信
号を演算することによって、同時に補間演算を行う画素
の数を減らし、しかも小回路規模ながら偽信号の少ない
輪郭信号を得ることが可能となる。As described above, according to the present invention,
Four kinds of color filters C1 having a two-dimensional repeating array,
Complementary color signals CS1, CS2 corresponding to each color filter from the all-pixel readout solid-state image sensor including C2, C3, C4,
CS3 and CS4 are output and the complementary color signals are input to the interpolation calculation means and the adder, and in the interpolation calculation means, the color filters C2, C1, C4 and C3 are arranged at the positions of the color filters C1, C2, C3 and C4, respectively. Interpolation signals CS2 ', CS1', CS4 ', CS3' to be output at the time of generation are input to the adder described above, and CS1 '+ CS2 or CS1 + CS for each pixel in the adder.
2 ′ or CS3 ′ + CS4 or CS3 + CS4 ′ is calculated and input as a luminance signal to the high frequency emphasizing means, and the high frequency emphasizing means performs high frequency emphasis frequency characteristic processing to generate a contour signal, and each pixel is generated. By calculating the luminance contour signal using the sum of the interpolation signal and the complementary color signal calculated for the luminance signal as the luminance signal, the number of pixels for which the interpolation calculation is performed at the same time is reduced, and the contour signal with a small circuit scale and few false signals is generated. It becomes possible to obtain.
【００２０】[0020]
【００２１】[0021]
【図１】本発明の輪郭補正装置の第１の実施例を示すブ
ロック図FIG. 1 is a block diagram showing a first embodiment of a contour correcting device of the present invention.
【００２２】[0022]
【図２】本発明の実施例に用いた色分離フィルタの配列
を示す図FIG. 2 is a diagram showing an array of color separation filters used in an embodiment of the present invention.
【００２３】[0023]
【図３】本発明の輪郭補正装置の第２の実施例を示すブ
ロック図FIG. 3 is a block diagram showing a second embodiment of the contour correcting device of the present invention.
【００２４】[0024]
【図４】色差順次方式に用いられる色フィルタの配列の
例を示す図FIG. 4 is a diagram showing an example of an array of color filters used in a color difference sequential system.
【００２５】[0025]
１ 全画素読み出し固体撮像素子 ２，３，４ 一水平走査期間遅延素子 ５ 補間演算手段 ６，７ 加算器 ８ 減算器 ９ 水平方向ローパスフィルタ １０ 垂直方向輪郭信号出力 １１ 水平方向輪郭信号出力 １２ 水平方向ハイパスフィルタ １３ 色信号処理手段 1 All-Pixel Readout Solid-State Image Sensor 2, 3, 4 1 Horizontal Scanning Period Delay Element 5 Interpolation Calculation Unit 6, 7 Adder 8 Subtractor 9 Horizontal Low-pass Filter 10 Vertical Direction Contour Signal Output 11 Horizontal Direction Contour Signal Output 12 Horizontal Direction High-pass filter 13 color signal processing means
───────────────────────────────────────────────────── フロントページの続き (72)発明者 佐々木 省吾 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Shogo Sasaki 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.
Claims (3)
１、Ｃ２、Ｃ３、Ｃ４を備えた全画素読み出し固体撮像
素子から各色フィルタに対応した色信号ＣＳ１、ＣＳ
２、ＣＳ３、ＣＳ４を出力し、前記色信号は補間演算手
段及び加算器に入力され、前記補間演算手段において、
色フィルタＣ１、Ｃ２、Ｃ３、Ｃ４の位置にそれぞれ色
フィルタＣ２、Ｃ１、Ｃ４、Ｃ３を配置した際に出力さ
れるべき補間信号ＣＳ２’、ＣＳ１’、ＣＳ４’、ＣＳ
３’を生成して前記加算器に入力し、前記加算器におい
て前記補間信号と前記色信号を各々加算し、各画素に対
してＣＳ１’＋ＣＳ２又はＣＳ１＋ＣＳ２’又はＣＳ
３’＋ＣＳ４又はＣＳ３＋ＣＳ４’を求め、この加算信
号を輝度信号として高域強調手段へ入力し、前記高域強
調手段において高域強調周波数特性処理を施すことによ
り輪郭信号を生成することを特徴とする輪郭補正装置。1. A color filter C having a two-dimensional repeating array.
Color signal CS1, CS corresponding to each color filter from the all-pixel readout solid-state image sensor including 1, C2, C3, C4
2, CS3, CS4 are output, and the color signal is input to the interpolation calculation means and the adder, and in the interpolation calculation means,
Interpolation signals CS2 ′, CS1 ′, CS4 ′, CS to be output when the color filters C2, C1, C4, C3 are arranged at the positions of the color filters C1, C2, C3, C4, respectively.
3'is generated and input to the adder, the adder adds the interpolation signal and the color signal, and CS1 '+ CS2 or CS1 + CS2' or CS is added to each pixel.
3 ′ + CS4 or CS3 + CS4 ′ is obtained, the added signal is input to the high frequency emphasizing means as a luminance signal, and the high frequency emphasizing frequency characteristic processing is performed in the high frequency emphasizing means to generate a contour signal. Contour correction device.
１、Ｃ２、Ｃ３、Ｃ４を備えた全画素読み出し固体撮像
素子から各色フィルタに対応した色信号ＣＳ１、ＣＳ
２、ＣＳ３、ＣＳ４を出力し、前記色信号は補間演算手
段及び加算器及び高域強調手段に入力され、前記補間演
算手段において、色フィルタＣ１、Ｃ２、Ｃ３、Ｃ４の
位置にそれぞれ色フィルタＣ２、Ｃ１、Ｃ４、Ｃ３を配
置した際に出力されるべき補間信号ＣＳ２’、ＣＳ
１’、ＣＳ４’、ＣＳ３’を生成して前記加算器に入力
し、前記加算器において前記補間信号と前記色信号を各
々加算し、各画素に対してＣＳ１’＋ＣＳ２又はＣＳ１
＋ＣＳ２’又はＣＳ３’＋ＣＳ４又はＣＳ３＋ＣＳ４’
を求め、この加算信号を輝度信号として前記高域強調手
段へ入力し、前記高域強調手段において高域強調周波数
特性処理を施すことにより輪郭信号を生成することを特
徴とする輪郭補正装置。2. A color filter C having a two-dimensional repeating array.
Color signal CS1, CS corresponding to each color filter from the all-pixel readout solid-state image sensor including 1, C2, C3, C4
2, CS3, CS4 are output, and the color signal is input to the interpolation calculation means, the adder, and the high-frequency emphasis means, and in the interpolation calculation means, the color filters C2, C2, C3, and C4 are respectively placed. , C1, C4, C3 are arranged, the interpolation signals CS2 ', CS to be output
1 ', CS4', CS3 'are generated and input to the adder, and the adder adds the interpolation signal and the color signal respectively, and CS1' + CS2 or CS1 is added to each pixel.
+ CS2 'or CS3' + CS4 or CS3 + CS4 '
And a contour signal is generated by inputting this added signal as a luminance signal to the high-frequency emphasis means, and performing high-frequency emphasis frequency characteristic processing in the high-frequency emphasis means to generate a contour signal.
４の分光特性が、Ｃ１＋Ｃ２とＣ３＋Ｃ４が略等しい分
光特性である請求項１または請求項２記載の輪郭補正装
置。3. Four types of color filters C1, C2, C3, C
4. The contour correction device according to claim 1, wherein the spectral characteristic of No. 4 is a spectral characteristic of C1 + C2 and C3 + C4 being substantially equal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20512994A JP3322017B2 (en) | 1994-08-30 | 1994-08-30 | Contour correction device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20512994A JP3322017B2 (en) | 1994-08-30 | 1994-08-30 | Contour correction device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0870466A true JPH0870466A (en) | 1996-03-12 |
| JP3322017B2 JP3322017B2 (en) | 2002-09-09 |
Family
ID=16501918
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20512994A Expired - Fee Related JP3322017B2 (en) | 1994-08-30 | 1994-08-30 | Contour correction device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3322017B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003096702A1 (en) | 2002-05-08 | 2003-11-20 | Matsushita Electric Industrial Co., Ltd. | Image signal processing device, image signal processing circuit, image signal processing method, program, and recording medium |
-
1994
- 1994-08-30 JP JP20512994A patent/JP3322017B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003096702A1 (en) | 2002-05-08 | 2003-11-20 | Matsushita Electric Industrial Co., Ltd. | Image signal processing device, image signal processing circuit, image signal processing method, program, and recording medium |
| EP1503600A1 (en) * | 2002-05-08 | 2005-02-02 | Matsushita Electric Industrial Co., Ltd. | Image signal processing device, image signal processing circuit, image signal processing method, program, and recording medium |
| US7499086B2 (en) | 2002-05-08 | 2009-03-03 | Panasonic Corporation | Image signal processing apparatus, image signal processing circuit, image signal processing method, program, and recording medium |
| EP1503600B1 (en) * | 2002-05-08 | 2015-07-01 | Panasonic Corporation | Image signal processing for suppressing artefacts in a luminance signal from an image sensor having a pixel array and an overlaid colour filter pattern |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3322017B2 (en) | 2002-09-09 |
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