JPH0640670B2 - Solid-state imaging device - Google Patents
Solid-state imaging deviceInfo
- Publication number
- JPH0640670B2 JPH0640670B2 JP60137705A JP13770585A JPH0640670B2 JP H0640670 B2 JPH0640670 B2 JP H0640670B2 JP 60137705 A JP60137705 A JP 60137705A JP 13770585 A JP13770585 A JP 13770585A JP H0640670 B2 JPH0640670 B2 JP H0640670B2
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Description
【発明の詳細な説明】 〔発明の利用分野〕 本発明は固体撮像装置に係り、特に広帯域な輝度信号
と、エッジにせ色信号が少ない色信号（色差信号）を得
ることができ、高い位置合せ精度を必要としない色分解
フィルタ方式に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid-state image pickup device, and in particular, it is possible to obtain a wide band luminance signal and a color signal (color difference signal) with a small number of color signals at the edges, thereby achieving high alignment. The present invention relates to a color separation filter method that does not require accuracy.
家庭用カラービデオカメラは、撮像素子として固体撮像
素子を１枚、あるいは撮像管を１本用いるのが主流とな
っている。これらの単板、あるいは単管カラービデオカ
メラにおいては、ひとつの撮像素子から輝度信号および
色信号を得るために撮像素子の受光面に色分解フィルタ
を設けている。A mainstream color video camera for home use is one solid-state image sensor or one image pickup tube as an image sensor. In these single-plate or single-tube color video cameras, a color separation filter is provided on the light receiving surface of the image pickup device in order to obtain a luminance signal and a color signal from one image pickup device.
広帯域の輝度信号と、エッジ部にせ信号の少ない色信号
を得るための色分解フィルタ方式としての従来の１例
が、特開昭53-50923号公報に示されている。この方式は
固体撮像素子の１受光セルに２種類の色分解フィルタを
ならべて設けることによって上記の広帯域輝度信号とエ
ッジ部にせ信号の少ない色信号を得ることができるもの
である。しかしこの方式では色分解フィルタの位置のあ
わせ精度が直接的に分光特性を左右するという問題があ
る。またひとつの色分解フィルタの寸法を小さくする必
要が生ずる場合もあり、そのとき色分解フィルタを高精
度で均質に製作することが困難となる。Japanese Patent Application Laid-Open No. 53-50923 discloses a conventional example of a color separation filter system for obtaining a wide band luminance signal and a color signal with few edge spurious signals. In this system, two kinds of color separation filters are arranged on one light-receiving cell of the solid-state image pickup device to obtain the above-mentioned wideband luminance signal and a color signal with few edge signals. However, this method has a problem that the alignment accuracy of the position of the color separation filter directly influences the spectral characteristic. In some cases, it may be necessary to reduce the size of one color separation filter, which makes it difficult to manufacture the color separation filter with high accuracy and homogeneity.
本発明の目的は、広帯域な輝度信号とエッジ部にせ信号
の少ない色信号を得ることができ、かつ色分解フィルタ
の位置あわせに高精度を必要としない固体撮像装置を提
供することにある。An object of the present invention is to provide a solid-state image pickup device which can obtain a luminance signal in a wide band and a color signal with a small amount of edge signal, and which does not require high precision in alignment of color separation filters.
本発明は、色分解フィルタの分光特性として、従来の赤
(R)，緑(G)，青(B)やそれらの補色であるシアン(Cy)，
マゼンタ(Mn)，黄(Ye)に限定せず、それらの中間的な分
光特性の色分解フィルタを用いることを特徴とする。The present invention uses the conventional red as the spectral characteristic of the color separation filter.
(R), green (G), blue (B) and their complementary colors cyan (Cy),
It is characterized in that it is not limited to magenta (Mn) and yellow (Ye), but uses a color separation filter having an intermediate spectral characteristic between them.
中間的な分光特性の色分解フィルタを用いることによ
り、ひとつの受光セルに２種類の色分解フィルタを設け
るのと同等の効果を得ながら、色分解フィルタの位置あ
わせなどを容易にする。By using a color separation filter having an intermediate spectral characteristic, it is possible to easily position the color separation filters while obtaining the same effect as providing two types of color separation filters in one light receiving cell.
以下、方発明の第１の実施例を第１図〜第６図により説
明する。第１図は固体撮像素子の受光面における受光セ
ルと色分解フィルタの配列を示すものである。同図で１
はひとつの受光セル、２〜５は受光セル上に設けられた
色分解フィルタで、８ケ単位でくり返す。以下の説明の
ため、同図の左上を原点とて下方向に第１行，２行，
…，右方向に第１列，２列，…と呼ぶ。はじめに、本撮
像素子の信号読み出しの方法を説明する。奇数フィール
ドでは第１行，第３行，と順次奇数行の受光セルの信号
を読み出す。それぞれの行における読み出し順序は第１
列，第２列，第３列と列順に連続的である。偶数フィー
ルドでは偶数行の受光セルの信号を奇数フィールドと同
様に読み出す。続いて本発明の特徴的部分である色分解
フィルタの分光特性を第２図〜第５図を開いて説明す
る。第２図は色分解フィルタ２の分光特性を示すもので
ある。以下、本明細書で色分解フィルタの分光特性とい
うときには、色分解フィルタの分光透過率と、受光セル
のみの分光特性と、赤外光を低減する赤外カットフィル
タ（以下の例では信号量が透過帯域の信号量の１／２と
なる波長が670nmのもので示す。）を総合した分光特性
を示すものとする。本図はＷ（全色透過）とCyの分光特
性とあわせて色分解フィルタ２の分光特性 を示している。以下同様に第３図は色分解フィルタ３の
分光特性 第４図は色分解フィルタ４の分光特性 第５は色分解フィルタ５の分光特性 を示す。次に本実施例で、撮像素子から得られた信号か
ら輝度及び色信号を生成する方法を説明する。はじめに
Ｗ，Cy,Ye，Ｇの成分組成を示す。それぞれ、 Ｗ＝Ｒ＋Ｇ＋Ｂ Cy＝Ｇ＋Ｂ Ye＝Ｒ＋Ｇ Ｇ＝Ｇ である。また輝度(Y)信号の成分組成はほぼ次のとおり
である。Hereinafter, a first embodiment of the invention will be described with reference to FIGS. FIG. 1 shows an arrangement of light receiving cells and color separation filters on the light receiving surface of a solid-state image sensor. 1 in the figure
Is one light receiving cell, and 2 to 5 are color separation filters provided on the light receiving cells, which are repeated in units of eight. For the explanation below, the first line, the second line, and
..., called to the right in the first row, the second row, .... First, a method of reading signals from the image sensor will be described. In the odd field, the signals of the light receiving cells in the first row, the third row, and the odd rows are read out sequentially. The read order in each row is first
It is continuous in the order of the column, the second column, the third column. In the even field, the signals of the light receiving cells in the even rows are read out similarly to the odd field. Next, the spectral characteristics of the color separation filter, which is a characteristic part of the present invention, will be described with reference to FIGS. FIG. 2 shows the spectral characteristics of the color separation filter 2. Hereinafter, when the spectral characteristics of the color separation filter are referred to in the present specification, the spectral transmittance of the color separation filter, the spectral characteristics of only the light receiving cell, and the infrared cut filter that reduces infrared light (in the following example, the signal amount is The wavelength is 670 nm, which is ½ of the signal amount in the transmission band, and the total spectral characteristics are shown. This figure shows the spectral characteristics of the color separation filter 2 along with the spectral characteristics of W (all color transmission) and Cy. Is shown. Similarly, FIG. 3 shows the spectral characteristics of the color separation filter 3. Figure 4 shows the spectral characteristics of the color separation filter 4. The fifth is the spectral characteristic of the color separation filter 5. Indicates. Next, in this embodiment, a method of generating a luminance and a color signal from a signal obtained from the image sensor will be described. First, the composition of W, Cy, Ye and G is shown. W = R + G + B Cy = G + B Ye = R + G G = G, respectively. The component composition of the luminance (Y) signal is almost as follows.
Ｙ＝Ｒ＋2G＋Ｂ 本実施例では先に示した信号読み出しと色分解フィルタ
の配置とにより、第ｎ行（第ｎ＋１行も同じ）〔以下ｎ
は整数〕を読み出すときには と の信号が順次読み出され、第ｎ＋２行（第ｎ＋３行も同
じ）を読み出すときには と の信号が順次読み出される。そこで第ｎ行（第ｎ＋１）
を読み出すときに得られる信号を加減算すると次の
Ｙ1，Ｃ1信号が得られる。Y = R + 2G + B In the present embodiment, the nth row (same for the (n + 1) th row) [hereinafter n
Is an integer] When Signals are sequentially read out, and when reading the (n + 2) th row (the same applies to the (n + 3) th row) When Signals are sequentially read. Then the nth row (nth + 1)
The following Y 1 and C 1 signals are obtained by adding and subtracting the signals obtained when reading
同様に第ｎ＋２行（第ｎ＋３）を読み出す時に得られる
信号を加減すると次のＹ2，Ｃ2信号が得られる。 Similarly, the following Y 2 and C 2 signals can be obtained by adding or subtracting the signal obtained when reading the n + 2th row (n + 3).
結局、各行から輝度信号が得られ、また１行ごとにＢ，
Ｒの信号が交互に得られる。（色線順次と呼ばれる。）
一般に色信号の必要帯域は輝度信号より狭いので、Ｂ，
Ｒは１水平期間遅延させて次の水平走査期間の信号にも
用いればよい。 After all, a luminance signal is obtained from each row, and B,
The R signals are obtained alternately. (It is called color line sequential.)
Generally, the required band of the color signal is narrower than that of the luminance signal, so that B,
R may be delayed for one horizontal period and used as a signal for the next horizontal scanning period.
なお、第２〜第５図では本発明の色分解フィルタの分光
特性をそれぞれ規格化して示しており、相対的な信号量
は示していない。相対的な信号量比に対応して輝度及び
色信号を得るための加減算に適当な係数はかければよ
い。Note that FIGS. 2 to 5 show the spectral characteristics of the color separation filter of the present invention in a standardized manner, and do not show the relative signal amount. Appropriate coefficients may be applied to addition and subtraction to obtain the luminance and chrominance signals corresponding to the relative signal amount ratio.
こうして得られる輝度および色信号の分光特性の例を第
６図に示す。FIG. 6 shows an example of the spectral characteristics of the luminance and color signals thus obtained.
続いて本実施例の効果を示す。本実施例では水平方向の
色分解フィルタのくり返し周期が２絵素ピッチであり、
Ｗ，Cy,Ye，Ｇの色分解フィルタひとつづつをそれぞれ
１受光セルに対応して設ける場合の水平方向の色分解フ
ィルタのくり返し周期（４絵素ピッチ）の半分となる。
すなわち水平方向のサンプリング数が２倍になったこと
に相当し、広帯域の輝度信号が得られることになる。ま
た色信号についてもサンプリング数が２倍になったこと
に相当し、水平方向のエッジに生ずるにせ信号が減少す
る。この原理と効果を換言すると、サンプリング周波数
が２倍になったことにより、輝度および色信号に生じる
モアレの中心周波数の水平方向成分が２倍になった、と
言うことができる。モアレ及び、モアレの算出方法につ
いては『高解像度ＭＯＳ形単板カラーカメラのモアレ検
討』（1984年テレビジョン学会全国大会予稿集、志賀
他）を参照していただきたい。Next, the effect of this embodiment will be shown. In the present embodiment, the repeating cycle of the color separation filter in the horizontal direction is 2 picture element pitches,
This is half the repeating period (4 pixel pitches) of the color separation filters in the horizontal direction when the W, Cy, Ye, and G color separation filters are provided corresponding to one light receiving cell.
That is, the number of horizontal samplings is doubled, and a wideband luminance signal is obtained. In addition, the sampling number of the color signal is also doubled, and the signal is reduced even if it occurs at the edge in the horizontal direction. In other words, it can be said that the sampling frequency is doubled, so that the horizontal direction component of the center frequency of the moire generated in the luminance and color signals is doubled. For more information on the moire and moire calculation methods, please refer to "High-resolution MOS single-chip color camera moire study" (1984 National Conference of the Television Society, Proceedings, Shiga et al.).
また色信号を得るために垂直絵素間の加減算を行なわな
いので垂直エッジに生じるにせ色信号が小さい。Further, since addition and subtraction between the vertical picture elements are not performed to obtain the color signal, the color signal generated at the vertical edge is small.
本発明によると受光セル間隔分の色分解フィルタの合せ
ずれは許容されるため、１受光素子に２種類の色分解フ
ィルタを並べて設ける場合に要求される高い位置あわせ
精度などを必要とせずに上記の効果を得ることができ
る。According to the present invention, misalignment of the color separation filters corresponding to the light receiving cell interval is allowed, so that the high alignment accuracy required when two types of color separation filters are provided side by side on one light receiving element is not required. The effect of can be obtained.
続いて本発明の第２の実施例を第１図，第７図〜第９図
を用いて説明する。第２の実施例でも受光セルと色分解
フィルタの配列は第１の実施例と同じく第１図に示した
とおりであり、信号の読み出し方法も同じである。本実
施例の第１の実施例との違いは色分解フィルタの分光特
性である。以下その分光特性を第７図，第８図を用いて
説明する。第７図は（本例での）色分解フィルタ２の分
光特性 と、色分解フィルタ３の分光特性 を示しており、第８図は色分解フィルタ４の分光特性 と、色分解フィルタ５の分光特性 を示している。ただしMnはマゼンタを表わし、 Mn＝Ｒ＋Ｂ である。本実施例で、第ｎ行を読み出すときに得られる
信号を加減算したものをＹ3，Ｃ3，第ｎ＋２行を読み出
すときに得られる信号を加減したものをＹ4，Ｃ4とする
と、それらは次の様になる。Next, a second embodiment of the present invention will be described with reference to FIGS. 1 and 7 to 9. Also in the second embodiment, the arrangement of the light receiving cells and the color separation filters is as shown in FIG. 1 as in the first embodiment, and the signal reading method is also the same. The difference between this embodiment and the first embodiment is the spectral characteristic of the color separation filter. The spectral characteristics will be described below with reference to FIGS. 7 and 8. FIG. 7 shows the spectral characteristics of the color separation filter 2 (in this example). And the spectral characteristics of the color separation filter 3 FIG. 8 shows the spectral characteristics of the color separation filter 4. And the spectral characteristics of the color separation filter 5 Is shown. However, Mn represents magenta, and Mn = R + B. In the present embodiment, if signals obtained when reading the nth row are added and subtracted are Y 3 , C 3 and those obtained when reading the n + 2th row are Y 4 and C 4 , then Is as follows.
第９図はＹ3，Ｃ3，Ｃ4の分光特性を示したものであ
る。Ｙ3はほぼ輝度信号の分光特性を示し、Ｃ3はほぼＢ
−Ｙ、Ｃ4はほぼＲ−Ｙの分光特性を示している。結
局、各行から輝度信号が得られ、また１行おきにＢ−
Ｙ、Ｒ−Ｙの信号が得られることになる。（色差線順次
と呼ばれる。）本例でも色差信号は１水平期間遅延させ
て次の水平走査期間の信号にも用いればよい。 FIG. 9 shows the spectral characteristics of Y 3 , C 3 and C 4 . Y 3 indicates almost the spectral characteristic of the luminance signal, and C 3 indicates almost B
-Y, C 4 represents the spectral characteristics of substantially R-Y. After all, a luminance signal is obtained from each row, and every other row B-
The Y and RY signals will be obtained. (This is also called color difference line sequential.) In this example as well, the color difference signal may be delayed for one horizontal period and used for the signal in the next horizontal scanning period.
なお、本例でも第７図、第８図では色分解フィルタの分
光特性をそれぞれ規格化して示しており相対的な信号量
は示していない。相対的な信号量比に対応して輝度及び
色差信号を得るための加減算に適当な係数をかければよ
い。Also in this example, FIGS. 7 and 8 show the spectral characteristics of the color separation filters in a standardized manner, and do not show the relative signal amount. Appropriate coefficients may be applied to addition and subtraction to obtain the luminance and color difference signals corresponding to the relative signal amount ratio.
続いて本実施例に特有の効果を説明する。本実施例では
各行から独立に色差信号を得ることができ、すなわち垂
直方向の絵素間の加減算なしに色差信号が得られるた
め、無彩色の垂直エッジに対してにせ色差信号が全く生
じない。またスメアについても色差成分は零となるので
色付を生じない。Next, the effect peculiar to this embodiment will be described. In this embodiment, the color difference signals can be obtained independently from each row, that is, the color difference signals can be obtained without addition or subtraction between the picture elements in the vertical direction, so that no false color difference signal is generated with respect to an achromatic vertical edge. In addition, since the color difference component of smear is also zero, coloring does not occur.
続いて本発明の第３の実施例を第10図及び第２〜第６図
を用いて説明する。第10図は第１図と同じく固体撮像素
子の受光面における受光セルと色分解フィルタの配列を
示すものであり、１はひとつの受光セル示し、６〜９は
受光セル上に設けられた色分解フィルタで４ケ単位でく
り返す。はじめに本撮像素子の読み出し方法を説明す
る。奇数フィールドでははじめの水平走査期間に第１行
と第２行を読み出し、次の水平走査期間に第３行と第４
行を、以下第２ｎ＋１行、第２ｎ＋２行を順次読み出
す。それぞれの水平走査期間においては列順に上下２行
を同時に読み出す。偶数フィールドでははじめの水平走
査期間に第２行と第３行を読み出し、次の水平走査期間
に第４行と第５行を、以下第２ｎ行、第２ｎ＋１行を順
次読み出す。それぞれの水平走査期間における読み出し
は奇数フィールドと同じである。本実施例では、色分解
フィルタの分光特性を 色分解フィルタ７の分光特性を 色分解フィルタ８の分光特性を 色分解フィルタ９の分光特性を とする。それぞれの色分解フィルタの特性は第２図〜第
５図に示されたものである。本実施例では先に示した第
１の実施例と同様に、第１式〜第４式に示した加減算に
より輝度および色信号を得ることができる。第１の実施
例との差は色信号が線順次でなく、すべての水平走査期
間で得られることである。本実施に特有の効果は各信号
線がフィールド毎に読み出されるため残像が生じにくい
ことと、２行ごとの信号から垂直絵素間の加減算なしに
色信号が得られるため、無彩色の垂直エッジに生じるに
せ信号が４行ごとの信号から色信号を得る第１の実施例
よりさらに小さいことである。Next, a third embodiment of the present invention will be described with reference to FIG. 10 and FIGS. FIG. 10 shows the arrangement of the light receiving cells and the color separation filters on the light receiving surface of the solid-state image sensor, as in FIG. 1, where 1 is one light receiving cell and 6 to 9 are the colors provided on the light receiving cells. Repeat every 4 units with the decomposition filter. First, a reading method of the image sensor will be described. In the odd field, the first row and the second row are read in the first horizontal scanning period, and the third row and the fourth row are read in the next horizontal scanning period.
The rows are sequentially read out from the 2n + 1th row and the 2n + 2th row. In each horizontal scanning period, the upper and lower two rows are simultaneously read in column order. In the even field, the second row and the third row are read in the first horizontal scanning period, the fourth row and the fifth row, and the 2nth row and the 2n + 1th row are sequentially read out in the next horizontal scanning period. The reading in each horizontal scanning period is the same as that in the odd field. In this embodiment, the spectral characteristics of the color separation filter are The spectral characteristics of the color separation filter 7 The spectral characteristics of the color separation filter 8 The spectral characteristics of the color separation filter 9 And The characteristics of each color separation filter are shown in FIGS. In this embodiment, similarly to the first embodiment shown above, the luminance and color signals can be obtained by the addition and subtraction shown in the first to fourth expressions. The difference from the first embodiment is that the color signals are not line-sequential but are obtained in all horizontal scanning periods. The effect peculiar to this embodiment is that each signal line is read out for each field, so that an afterimage is unlikely to occur, and a color signal can be obtained from a signal for every two rows without addition and subtraction between vertical picture elements, and thus an achromatic vertical edge is obtained. That is, the false signal that occurs in 1) is smaller than that in the first embodiment in which the color signal is obtained from the signal every 4 rows.
続いて本発明の第４の実施例を第10図及び第７図〜第９
図を用いて説明する。第４の実施例でも受光セルと色分
解フィルタの配列は第３の実施例と同じく第10図に示し
たとおりであり、信号の読み出し方法も同じである。本
実施例の第３の実施例との違いは色分解フィルタの分光
特性である。本実施例では色分解フィルタ６の分光特性
を 色分解フィルタ７の分光特性を 色分解フィルタ８の分光特性を 色分解フィルタ９の分光特性を とする。それぞれの色分解フィルタの特性は第７〜第８
図に示したとおりである。本実施例では先に示した第２
の実施例と同様に、第５式〜第７式に示した加減算によ
り輝度および色差信号を得ることができる。得られる
Ｙ，Ｒ−Ｙ，ＢＹ信号は第９図に示すとおりである。第
２の実施例との差は色差信号がすべての水平走査期間で
得られることである。本実施例に特有の効果は第３の実
施例と同様に残像が生じにくいことと、２行ごとの信号
から色差信号が得られるため、無彩色の条件がくずれた
とき垂直エッジ部に生じるにせ色信号が、４行ごとの信
号から色差信号が得られる第２の実施例より小さいこと
である。Subsequently, a fourth embodiment of the present invention will be described with reference to FIGS. 10 and 7-9.
It will be described with reference to the drawings. Also in the fourth embodiment, the arrangement of the light receiving cells and the color separation filters is as shown in FIG. 10 similarly to the third embodiment, and the signal reading method is also the same. The difference between this embodiment and the third embodiment is the spectral characteristic of the color separation filter. In this embodiment, the spectral characteristic of the color separation filter 6 is The spectral characteristics of the color separation filter 7 The spectral characteristics of the color separation filter 8 The spectral characteristics of the color separation filter 9 And The characteristics of each color separation filter are 7th to 8th.
As shown in the figure. In the present embodiment, the above-mentioned second
Similarly to the embodiment described above, the luminance and color difference signals can be obtained by the addition and subtraction shown in the fifth to seventh equations. The obtained Y, RY and BY signals are as shown in FIG. The difference from the second embodiment is that the color difference signal is obtained in all horizontal scanning periods. The effect peculiar to this embodiment is that afterimages are unlikely to occur and color difference signals are obtained from signals for every two rows as in the case of the third embodiment. The color signal is smaller than that in the second embodiment in which the color difference signal is obtained from the signal for every four rows.
ところで第１〜第４の実施例のひとつの変形として、例
えば第１の実施例で と の色分解フィルタの位置を置き換えたような例が考えら
れる。この変形例の特性は第１の実施例と同じであり、
製造上の難易などで選択をすればよい。By the way, as one modification of the first to fourth embodiments, for example, in the first embodiment, When An example is considered in which the position of the color separation filter is replaced. The characteristics of this modification are the same as those of the first embodiment,
It may be selected depending on the difficulty in manufacturing.
また第１〜第４の実施例の第２の変形として、例えば第
４の実施例でＹ3やＹ4信号の高域からバンドパスフィル
ターで変調された色差信号を抜き取る例がある。ここで
この変調の周波数がＮＴＳＣ方式のサブキャリヤと一致
するような方法とすると、色差信号を外部回路で変調す
る必要がなく信号処理が容易となる。As a second modification of the first to fourth embodiments, there is an example of extracting the modulated chrominance signal band-pass filter from the high range Y 3 and Y 4 signal, for example the fourth embodiment. If a method is adopted in which the frequency of this modulation matches the subcarrier of the NTSC system, it is not necessary to modulate the color difference signal by an external circuit, and signal processing becomes easy.
さらに、以上のすべての実施例では色信号あるいは色差
信号を得るために、垂直絵素間の加減算が不要である色
分解フィルタの配置を示したが、色分解フィルタの水平
・垂直配置を置き換えて、水平絵素間の加減算が不要で
ある配置とすることが可能である。こうすると、無彩色
の水平エッジに生じるにせ色信号を低減、あるいは零と
することができる。Furthermore, in all of the above embodiments, the arrangement of the color separation filters, which does not require addition and subtraction between the vertical picture elements in order to obtain the color signal or the color difference signal, is shown. However, the horizontal and vertical arrangements of the color separation filters are replaced. It is possible to arrange such that addition and subtraction between horizontal picture elements are unnecessary. By doing so, it is possible to reduce or even reduce the color signal generated at the horizontal edge of the achromatic color.
なお本発明では加算して輝度信号を得るための信号、例
えば第１の実施例では の無彩色被写体に対する信号量比のばらつきがＷ，Cy,Y
e，Ｇの信号量比のばらつきより小さいため輝度信号に
生じるモアレがＷ，Cy,Ye，Ｇの色分解フィルタを用い
たものより小さくなるという効果もある。これについて
も参考文献２を参照していただきたい。In the present invention, a signal for adding to obtain a luminance signal, for example, in the first embodiment, Variation of the signal amount ratio for an achromatic subject of W, Cy, Y
Since the variation of the signal amount ratio of e and G is smaller, the moire generated in the luminance signal is smaller than that using the color separation filters of W, Cy, Ye, and G. See also Reference 2 regarding this.
本発明によれば加算して輝度信号を得るための信号の各
々のくり返し周期が短かくなるため、広帯域の輝度信号
を得ることができる。また色信号（色差信号）を得るた
めの減算を水平方向のみとすることができるため、垂直
の無彩色エッジに生じるにせ色信号（にせ色差信号）を
小さくしたり、零にしたりすることができる。なお本発
明では上記効果を得るための色分解フィルタの位置合せ
精度が、現状で確立されているひとつの受光セルにひと
つの色分解フィルタを合わせる程度で良い。According to the present invention, the repetition cycle of each signal for adding to obtain a luminance signal becomes short, so that a luminance signal in a wide band can be obtained. Further, since the subtraction for obtaining the color signal (color difference signal) can be performed only in the horizontal direction, the false color signal (false color difference signal) generated at the vertical achromatic edge can be reduced or set to zero. . In the present invention, the positioning accuracy of the color separation filter for obtaining the above effect may be such that one color separation filter is matched with one light receiving cell which is currently established.
第１図と第10図は本発明の一実施例の固体撮像素子の受
光面における受光セルと色分解フィルタの配列を示す模
式図、 第２〜第６図は本発明の第１，第３の実施例を説明する
ための分光特性図、 第７〜第９図は本発明の第２，第４の実施例を説明する
ための分光特性図である。 １……受光セル、 ２〜９……色分解フィルタ。FIG. 1 and FIG. 10 are schematic views showing the arrangement of the light receiving cells and the color separation filters on the light receiving surface of the solid-state image pickup device of one embodiment of the present invention, and FIGS. 2 to 6 are the first and third embodiments of the present invention. FIG. 7 is a spectral characteristic diagram for explaining the embodiment of the present invention, and FIGS. 7 to 9 are spectral characteristic diagrams for explaining the second and fourth embodiments of the present invention. 1 ... Light receiving cell, 2-9 ... Color separation filter.
Claims (1)
状に配列された複数個の光電変換素子と、各光電変換素
子に各々一対一に対応して設けられる複数個の光学フィ
ルタと、を具備して成る固体撮像装置において、 複数個の前記光学フィルタは、各々、対応する光電変換
素子の受光面と対向する領域が少なくとも一様の分光特
性を有し、かつ、マゼンタの分光特性とシアンの分光特
性との平均の分光特性を、前記分光特性として有する第
１の種類か、緑の分光特性と黄の分光特性との平均の分
光特性を、前記分光特性として有する第２の種類か、緑
の分光特性とシアンの分光特性との平均の分光特性を、
前記分光特性として有する第３の種類か、またはマゼン
タの分光特性と黄の分光特性との平均の分光特性を、前
記分光特性として有する第４の種類のうち、何れかの種
類に属すると共に、 前記第１の種類に属する光学フィルタと第２の光学フィ
ルタに属する光学フィルタは、前記撮像画面の水平方向
に交互に配置されて、第１の光学フィルタ群を構成し、
前記第３の種類に属する光学フィルタと第４の光学フィ
ルタに属する光学フィルタは、前記撮像画面の水平方向
に交互に配置されて、第２の光学フィルタ群を構成し、
前記第１の光学フィルタ群と第２の光学フィルタ群は、
前記撮像画面の垂直方向に１行または２行ずつ交互に配
置され、 前記第１の種類に属する光学フィルタが設けられた光電
変換素子（以下、第１の光電変換素子という）から得ら
れる信号と、前記第２の種類に属する光学フィルタが設
けられ、前記撮像画面の水平方向において前記第１の光
電変換素子と隣接する光電変換素子から得られる信号
と、の加算信号として輝度信号を、減算信号として第１
の種類の色信号を、それぞれ得、前記第３の種類に属す
る光学フィルタが設けられた光電変換素子（以下、第３
の光電変換素子という）から得られる信号と、前記第４
の種類に属する光学フィルタが設けられ、前記撮像画面
の水平方向において前記第３の光電変換素子と隣接する
光電変換素子から得られる信号と、の加算信号として輝
度信号を、減算信号として第２の種類の色信号を、それ
ぞれ得ることを特徴とする固体撮像装置。1. A plurality of photoelectric conversion elements arranged in a matrix in the horizontal and vertical directions of an image pickup screen, and a plurality of optical filters provided in a one-to-one correspondence with each photoelectric conversion element. In the solid-state image pickup device configured as described above, each of the plurality of optical filters has at least a uniform spectral characteristic in a region facing a light receiving surface of a corresponding photoelectric conversion element, and has a magenta spectral characteristic and a cyan spectral characteristic. A first type having an average spectral characteristic with the spectral characteristic as the spectral characteristic, or a second type having an average spectral characteristic of the green spectral characteristic and the yellow spectral characteristic as the spectral characteristic, or green. The average spectral characteristic of the spectral characteristic of and the spectral characteristic of cyan,
The third type having the spectral characteristic or an average spectral characteristic of the magenta spectral characteristic and the yellow spectral characteristic belongs to any one of the fourth types having the spectral characteristic, and The optical filters belonging to the first type and the optical filters belonging to the second optical filter are alternately arranged in the horizontal direction of the image pickup screen to form a first optical filter group,
The optical filters belonging to the third type and the optical filters belonging to the fourth optical filter are alternately arranged in the horizontal direction of the imaging screen to form a second optical filter group,
The first optical filter group and the second optical filter group,
A signal obtained from a photoelectric conversion element (hereinafter, referred to as a first photoelectric conversion element) provided with an optical filter belonging to the first type, which is alternately arranged in one row or two rows in the vertical direction of the imaging screen. , A signal obtained from a photoelectric conversion element adjacent to the first photoelectric conversion element in the horizontal direction of the image pickup screen, and a luminance signal as a subtraction signal. As the first
And a photoelectric conversion element provided with an optical filter belonging to the third type (hereinafter, referred to as a third type).
Signal obtained from the photoelectric conversion element of
An optical filter belonging to the above type is provided, and a luminance signal is added as a signal added with a signal obtained from a photoelectric conversion element adjacent to the third photoelectric conversion element in the horizontal direction of the imaging screen, and a second signal is used as a subtraction signal. A solid-state image pickup device characterized in that it obtains respective kinds of color signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60137705A JPH0640670B2 (en) | 1985-06-26 | 1985-06-26 | Solid-state imaging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60137705A JPH0640670B2 (en) | 1985-06-26 | 1985-06-26 | Solid-state imaging device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61296876A JPS61296876A (en) | 1986-12-27 |
| JPH0640670B2 true JPH0640670B2 (en) | 1994-05-25 |
Family
ID=15204891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60137705A Expired - Lifetime JPH0640670B2 (en) | 1985-06-26 | 1985-06-26 | Solid-state imaging device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0640670B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2595077B2 (en) * | 1988-12-23 | 1997-03-26 | 株式会社日立製作所 | Imaging device |
| JP2591182B2 (en) * | 1989-09-22 | 1997-03-19 | 日本電気株式会社 | Color solid-state imaging device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6054590A (en) * | 1983-09-05 | 1985-03-29 | Sharp Corp | Single plate color imaging device |
-
1985
- 1985-06-26 JP JP60137705A patent/JPH0640670B2/en not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| テレビジョン学会誌３７〔１０〕（昭５８−１０）Ｐ．８４７−８５４ |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61296876A (en) | 1986-12-27 |
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