JP3542396B2 - Imaging device and imaging method - Google Patents

Description

【０００７】
によりＲＧＢ成分を得る。これらのＲＧＢ成分はホワイトバランス回路（ＷＢ）内の乗算器１３３、１３４でＧ成分を基準にしてゲイン調整を施すことにより、ホワイトバランスをとる。ホワイトバランスをとったＲＧＢ成分は、ゲインコントロール回路１２０の出力であるディテール信号（ＤＴＬ）を、それぞれ加算器１３５、１３６、１３７で足し合わせＲＧＢの高域を強調する。
これらの信号はニー回路１３８〜１４０で高レベル成分のゲインを抑圧し、ガンマ補正回路１４１〜１４３でガンマ補正を行う。次に、行列演算回路１４４で
【０００８】
【数２】

【０００９】
により、色差信号Ｒ−Ｙ、Ｂ−Ｙを生成する。色差信号は色相補正回路１４５で色相を補正した後、低域通過フィルタ１４６、１４７で後の変調に適するように高域をカットしておく。変調回路１４８で変調及びバースト信号の付加を行い、ディジタル−アナログ（Ｄ／Ａ）変換器１４９でアナログ信号に戻し、低域通過フィルタ１５０を経てビデオ色信号ＣＯＵＴとなる。
【００１０】
ニー回路１３８〜１４０の出力及びガンマ補正回路１４１〜１４３の出力は、それぞれセレクタ１５１〜１５３に送られ、ブランキング付加回路１５４〜１５６でブランキング信号を付加し、ディジタル赤信号ＲＯＵＴ、ディジタル緑信号ＧＯＵＴ、ディジタル青信号ＢＯＵＴとなる。これらのディジタル出力は不図示のコンピュータ、プリンタ等のマルチメディア機器に入力される。これらのマルチメディア機器のガンマ補正の要不要に応じて、セレクタ１５１〜１５３の入力を切り替える。
【００１１】
【発明が解決しようとする課題】
しかしながら、上記従来例では、ＣＣＤの各色成分を同時化する際に前置補間を行い、その後に行列演算を行い、ＲＧＢ成分を得ているため、水平方向の帯域が狭い。これは、変調してアナログ信号に戻しＴＶモニタに出力する際には問題ないが、ディジタルＲＧＢ出力をコンピュータ、プリンタ等のマルチメディア機器の画面で表示すると、十分な解像度が得られず、なおかつ色にじみをおこしてしまうという欠点があった。
【００１２】
本発明は、上述の問題点に鑑みてなされたものであり、各フィールド用に独立した２ライン毎のフィルタを備える撮像素子を用いて被写体を撮像したとしても、水平方向に関して高解像度の映像信号が得られるようにすることを目的とする。
【００１３】
【課題を解決するための手段】
本発明の撮像装置は、各フィールド用に独立した２ライン毎のフィルタを使用することで被写体を撮像してインターレースによる第１フィールド及び第２フィールドの撮像信号を、点順次化された複数の色信号として２ラインおきに出力する撮像手段と、上記撮像手段から得られる上記第１フィールドの複数の色信号を１フィールド遅延させる遅延手段と、上記第２フィールドの各色信号と、上記遅延手段で遅延された上記第１フィールドの各色信号とを、全ての色信号に関してライン方向に画素単位で切り替えて出力する切替出力手段とを備えたことを特徴としている。
本発明の撮像方法は、各フィールド用に独立した２ライン毎のフィルタを使用することで被写体を撮像してインターレースによる第１フィールド及び第２フィールドの撮像信号を、点順次化された複数の色信号として２ラインおきに出力する撮像工程と、上記撮像工程において得られる上記第１フィールドの複数の色信号を１フィールド遅延させる遅延工程と、上記第２フィールドの各色信号と上記遅延工程で遅延された上記第１フィールドの各色信号とを、全ての色信号に関してライン方向に画素単位で切り替えて出力する切替出力工程とを備えたことを特徴としている。
【００１４】
【作用】
本発明によれば、各フィールド用に独立した２ライン毎のフィルタを使用することで被写体を撮像してインターレースによる第１フィールド及び第２フィールドの撮像信号を、点順次化された複数の色信号として２ラインおきに出力し、出力した上記第１フィールドの複数の色信号を１フィールド遅延させ、上記遅延させた上記第１フィールドの各色信号と、上記第２フィールドの各色信号とを、全ての色信号に関してライン方向に画素単位で切り替えて出力し、上記第１フィールドと上記第２フィールドとにおけるフィールド間補間処理を行う。
【００１５】
【実施例】
本発明の実施例は図１に示す概念に基づいて構成されている。固体撮像素子１から読み出された２系統の信号はそれぞれアナログディジタル（ＡＤ）変換器２、３でＡＤ変換されてディジタル信号となる。これらのディジタル信号は、ディジタル信号処理回路４の中のフィールドメモリ５でＴＶ信号の１フィールド期間遅延され、遅延されていない信号と信号合成回路６、７で同時化される。こられの同時化された信号から行列演算回路８で例えばＲＧＢ信号等の３つの色信号を生成する。ディジタル信号処理回路４の図示しない他の部分の処理により、ビデオ輝度信号、ビデオ色信号を生成する。
【００１６】
次に本発明の第１の実施例を図２、図３を用いて説明する。尚、図２、図３においては図６及び互いに対応する部分には同一符号を付して重複する説明を省略する。図２においては、フィールドメモリ１５７及び信号合成回路１５８を設けた点が図６と異っている。
【００１７】
次に上記構成による動作について説明する。
メモリ１０９、１１０で１Ｈ遅延されたディジタルのＹｅ、Ｃｙ、Ｍｇ、Ｇの信号は、フィールドメモリ１５７でＴＶ信号の１フィールド期間遅延され、図７のｏｄｄで示すデータとｅｖｅｎで示すデータとが同時に信号合成回路１５８に送られる。信号合成回路１５８の内部構成を図３に示す。
【００１８】
図３では、図２の低域通過フィルタ１２８〜１３１の出力は信号２０１〜２０４、フィールドメモリ１５７の出力は信号２０５、２０６に対応し、１Ｈメモリ１０９、１１０の出力は信号２０７、２０８に対応する。
信号２０５、２０６と信号２０７、２０８との間には１フィールドの位相差があるので、信号２０５、２０６が図７の第ｎラインであるとき、信号２０７、２０８は第ｎ＋２６３ラインに相当する。
信号２０５、２０７はセレクタ２０９、２１０に送られる。このとき、信号２０５、２０７ではＹｅ、Ｃｙの位相がずれているので、１画素ごとにセレクタ２０９、２１０を切り換えて、セレクタ２０９の出力にＹｅ成分が得られ、セレクタ２１０の出力にＣｙ成分が得られるようにする。セレクタ２０９、２１０の出力には第ｎラインのデータと第ｎ＋２６３ラインのデータとが交互に現れる。信号２０６、２０８についても同様の動作により、セレクタ２１１の出力にＭｇ成分が得られ、セレクタ２１２の出力にＧ成分が得られるようにする。
【００１９】
このようにフィールド間で補間することにより、各色成分の水平方向の画素数を２倍にして解像度を向上させることができる。
セレクタ２１３〜２１６では従来のライン内の補間を行ったデータ２０１〜２０４とセレクタ２０９〜２１２の出力とを必要に応じて切り換える。
以上のようにしてＹｅ、Ｃｙ、Ｍｇ、Ｇ成分を得たあとの処理は図６の従来例と同じである。
【００２０】
次に本発明の第２の実施例を説明する。
本実施例では、ＣＣＤの画素配置が図４のようになっている。ｏｄｄのデータとｅｖｅｎのデータとで色フィルタの配置が揃っている点が第１の実施例と異なる。また、回路構成上で第１の実施例の図２と異なるのは信号合成回路１５８の内部構成のみである。図５に第２の実施例による信号合成回路１５８を示す。
【００２１】
図５では、図２の低域通過フィルタ１２８〜１３１の出力は信号３０１〜３０４、フィールドメモリ１５７の出力は信号３０５、３０６に対応し、１Ｈメモリ１０９、１１０の出力は信号３０７、３０８に対応する。
信号３０５、３０６と３０７、３０８との間には１フィールドの位相差があるので、信号３０５、３０６が図４の第ｎラインであるとき、信号３０７、３０８は第ｎ＋２６３ラインに相当する。
上記のうち信号３０５、３０７はセレクタ３０９、３１０に送られる。このとき、信号３０５、３０７ではＹｅ、Ｃｙの位相が揃っているので、信号３０５は遅延器３２１でクロックＣＬＫにより１画素遅延し、１フィールド後の信号３０７とＹｅ、Ｃｙの順番が互い違いになるようにする。次に、１画素ごとにセレクタ３０９、３１０を切り換えて、セレクタ３０９の出力にＹｅ成分が得られ、セレクタ３１０の出力にＣｙ成分が得られるようにする。信号３０６、３０８についても、信号３０６を遅延器３２２で１画素遅延し、上記と同様の動作により、セレクタ３１１の出力にＭｇ成分が得られ、セレクタ３１２の出力にＧ成分が得られるようにする。
【００２２】
このようにフィールド間で補間することにより、各色成分の水平方向の画素数を２倍にして解像度を向上させることができる。
セレクタ３１３〜３１６では、従来のライン内の補間を行ったデータ３０１〜３０４とセレクタ３０９〜３１２の出力とを必要に応じて切り換える。
以上のようにしてＹｅ、Ｃｙ、Ｍｇ、Ｇ成分を得たあとの処理は図６の従来例と同じである。
このように、第１及び第２の実施例では、撮像された映像信号と１フィールド前の映像信号とを合成するように構成したことにより、合成された信号を行列演算すれば、広帯域ＲＧＢ信号を得ることができ、マルチメディア対応に耐え得る高精細画像を得ることができる。
特に、非加算読みだし型のＣＣＤを用いたシステムにおいて広帯域ディジタルＲＧＢ出力を得られる効果がある。
また、複数の色信号を点順次に出力する多画素ＣＣＤを用いたシステムにおいてマルチメディア対応に耐え得る帯域ディジタルＲＧＢ出力を得られる効果がある。
【００２３】
【発明の効果】
以上説明したように、本発明によれば、各フィールド用に独立した２ライン毎のフィルタを使用することで被写体を撮像してインターレースによる第１フィールド及び第２フィールドの撮像信号を、点順次化された複数の色信号として２ラインおきに出力し、出力した上記第１フィールドの複数の色信号を１フィールド遅延させ、上記遅延させた上記第１フィールドの各色信号と、上記第２フィールドの各色信号とを、全ての色信号に関してライン方向に画素単位で切り替えて出力し、フィールド間補間処理を行う。これにより、各フィールド用に独立した２ライン毎のフィルタを備える撮像手段を用いて被写体を撮像したとしても、簡単な構成で、水平方向に関して高解像度の映像信号を得ることができる。
【図面の簡単な説明】
【図１】本発明の実施例を概念的に示すブロック図である。
【図２】本発明の第１の実施例を示すブロック図である。
【図３】第１の実施例に用いられる信号合成回路を示す回路図である。
【図４】本発明の第２の実施例に用いられるＣＣＤの画素配置を示す構成図である。
【図５】第２の実施例に用いられる信号合成回路を示す回路図である。
【図６】従来の撮像装置を示すブロック図である。
【図７】従来及び第１の実施例で用いられるＣＣＤの画素配置を示す構成図である。
【符号の説明】
１、１０１ 撮像素子
５、１５７ フィールドメモリ
６、７、１５８ 信号合成回路[0001]
[Industrial applications]
The present invention relates to an imaging device and an imaging method used in a color video camera or the like.
[0002]
[Prior art]
FIG. 6 shows a conventional imaging device. In the solid-state imaging device 101, color filters are separately arranged for even-numbered fields and odd-numbered fields in interlaced scanning as shown in FIG. 7, Ye and Cy are read out every other pixel from VOUT1 in FIG. Is read out every other pixel for each of Mg and G.
After the signals of these two systems are sampled and held by the sample and hold circuits 102 and 103, automatic gain adjustment is performed by the AGC circuits 104 and 105, and the analog and digital (AD) converters 106 and 107 convert the signals into digital signals. . Outputs of the AD converters 106 and 107 are delayed by memories 109 and 110 each having a capacity corresponding to one horizontal period (hereinafter, referred to as 1H) of a television signal. The outputs of the AD converters 106 and 107 are added by an adder 108, and the outputs of the memories 109 and 110 are added by an adder 111.
A luminance signal is generated by this addition operation.
[0003]
The outputs of the adders 108 and 111 are subjected to color carrier removal by low-pass filters 112 and 113, respectively. The output of the reduction pass filter 113 is further delayed by a memory 114 having a capacity of 1H. The outputs of the low-pass filters 112 and 113 and the output of the memory 114 form a continuous 3H luminance signal. These continuous 3H signals are extracted as high-frequency components by the high-pass filter 115 of the aperture correction circuit 100, and then removed as noise components by the base clip circuit 117, thereby becoming aperture signals in the vertical direction. The output of the low-pass filter 113 is converted into a horizontal aperture signal by extracting a high-frequency component with a high-pass filter 116 and then removing a noise component with a base clip circuit 118. After the vertical and horizontal aperture components are added by the adder 119, the signal level is adjusted by the gain control circuit 120, so that a detail signal (DTL) is obtained.
The output of the low-pass filter 113 and the detail signal (DTL) are adjusted in phase by a delay unit (not shown) and then added by the adder 121 to realize aperture correction.
[0004]
The luminance signal that has achieved the aperture correction is suppressed by the knee circuit 122 to suppress the gain of the high luminance component, the gamma correction circuit 123 performs gamma correction, and the blanking addition circuit 124 adds the blanking signal. Further, the digital-to-analog (DA) converter 125 converts the signal into a digital signal and converts the signal into an analog signal.
[0005]
On the other hand, the outputs of the memories 109 and 110 are sent to the synchronizing / interpolating circuit 127 to synchronize the respective color components of the CCD. These components are subjected to removal of aliasing components by low-pass filters 128 to 131, respectively. Further, in the matrix operation circuit 132,
(Equation 1)

[0007]
To obtain the RGB components. These RGB components are subjected to gain adjustment by multipliers 133 and 134 in a white balance circuit (WB) based on the G component, thereby achieving white balance. The R, G, and B components are added to a detail signal (DTL) output from the gain control circuit 120 by adders 135, 136, and 137 to emphasize the high frequency range of RGB.
These signals suppress high-level component gains in knee circuits 138 to 140 and perform gamma correction in gamma correction circuits 141 to 143. Next, in the matrix operation circuit 144,
(Equation 2)

[0009]
Generates the color difference signals RY and BY. The hue correction circuit 145 corrects the hue of the color difference signal, and the low-pass filters 146 and 147 cut the high frequency range so as to be suitable for subsequent modulation. The modulation and the addition of the burst signal are performed by the modulation circuit 148, and the digital signal is returned to the analog signal by the digital-analog (D / A) converter 149.
[0010]
The outputs of the knee circuits 138 to 140 and the outputs of the gamma correction circuits 141 to 143 are sent to selectors 151 to 153, respectively, and blanking signals are added by blanking addition circuits 154 to 156, and the digital red signal ROUT and the digital green signal are output. GOUT and digital blue signal BOUT. These digital outputs are input to a multimedia device such as a computer or a printer (not shown). The inputs of the selectors 151 to 153 are switched according to the necessity of gamma correction of these multimedia devices.
[0011]
[Problems to be solved by the invention]
However, in the above-mentioned conventional example, the pre-interpolation is performed when the respective color components of the CCD are synchronized, and then the matrix operation is performed to obtain the RGB components. Therefore, the horizontal band is narrow. This is not a problem when the signal is modulated and converted back to an analog signal and output to a TV monitor. However, when the digital RGB output is displayed on a screen of a multimedia device such as a computer or a printer, a sufficient resolution cannot be obtained, and the color and color are not obtained. There was a drawback that bleeding occurred.
[0012]
The present invention has been made in view of the above-described problem, and even when an image of a subject is captured using an image sensor having an independent filter for every two lines for each field, a high-resolution video signal in the horizontal direction is obtained. Is intended to be obtained.
[0013]
[Means for Solving the Problems]
The imaging apparatus of the present invention captures an object by using an independent filter for every two lines for each field, and converts the image signals of the first field and the second field by interlacing into a plurality of dot-sequential colors. Imaging means for outputting a signal every two lines, delay means for delaying a plurality of color signals of the first field obtained from the imaging means by one field, color signals of the second field, and delay by the delay means And a switching output unit that switches and outputs each of the color signals of the first field with respect to all the color signals in the line direction in pixel units.
The imaging method of the present invention captures an object by using an independent filter for every two lines for each field, and converts the image signals of the first and second fields by interlacing into a plurality of dot-sequential colors. An imaging step of outputting every two lines as a signal, a delay step of delaying the plurality of color signals of the first field obtained in the imaging step by one field, and a delay of each color signal of the second field and the delay step. And a switching output step of switching and outputting each color signal of the first field with respect to all color signals in the line direction in pixel units.
[0014]
[Action]
According to the present invention, a subject is imaged by using an independent filter for every two lines for each field, and the image signals of the first field and the second field by interlacing are converted into a plurality of dot-sequential color signals. And outputs the plurality of color signals of the first field delayed by one field. The delayed color signals of the first field and the color signals of the second field are all output. The color signal is switched and output in the line direction on a pixel-by-pixel basis, and an inter-field interpolation process in the first field and the second field is performed.
[0015]
【Example】
The embodiment of the present invention is configured based on the concept shown in FIG. The two-system signals read from the solid-state imaging device 1 are AD-converted by analog-to-digital (AD) converters 2 and 3 to become digital signals. These digital signals are delayed by one field period of the TV signal in the field memory 5 in the digital signal processing circuit 4 and are synchronized with the undelayed signals in the signal synthesizing circuits 6 and 7. From these synchronized signals, a matrix operation circuit 8 generates three color signals such as RGB signals. The digital signal processing circuit 4 generates a video luminance signal and a video chrominance signal by processing other parts (not shown).
[0016]
Next, a first embodiment of the present invention will be described with reference to FIGS. In FIGS. 2 and 3, parts corresponding to those in FIG. 6 are denoted by the same reference numerals, and redundant description will be omitted. FIG. 2 differs from FIG. 6 in that a field memory 157 and a signal combining circuit 158 are provided.
[0017]
Next, the operation of the above configuration will be described.
The digital Ye, Cy, Mg, and G signals delayed by 1H in the memories 109 and 110 are delayed by one field period of the TV signal in the field memory 157, and the data indicated by odd and the data indicated by even in FIG. The signal is sent to the signal synthesis circuit 158. FIG. 3 shows the internal configuration of the signal synthesis circuit 158.
[0018]
In FIG. 3, the outputs of the low-pass filters 128 to 131 in FIG. 2 correspond to the signals 201 to 204, the outputs of the field memory 157 correspond to the signals 205 and 206, and the outputs of the 1H memories 109 and 110 correspond to the signals 207 and 208. I do.
Since there is a phase difference of one field between the signals 205 and 206 and the signals 207 and 208, when the signals 205 and 206 are the n-th line in FIG. 7, the signals 207 and 208 correspond to the (n + 263) -th line.
The signals 205 and 207 are sent to the selectors 209 and 210. At this time, since the phases of Ye and Cy are shifted in the signals 205 and 207, the selectors 209 and 210 are switched for each pixel, and the Ye component is obtained at the output of the selector 209, and the Cy component is obtained at the output of the selector 210. To be obtained. The data of the n-th line and the data of the (n + 263) -th line appear alternately on the outputs of the selectors 209 and 210. The same operation is performed on the signals 206 and 208 so that the Mg component is obtained at the output of the selector 211 and the G component is obtained at the output of the selector 212.
[0019]
By interpolating between fields in this manner, the number of pixels of each color component in the horizontal direction can be doubled to improve the resolution.
The selectors 213 to 216 switch between the data 201 to 204 obtained by performing the conventional in-line interpolation and the outputs of the selectors 209 to 212 as necessary.
The processing after obtaining the Ye, Cy, Mg, and G components as described above is the same as in the conventional example of FIG.
[0020]
Next, a second embodiment of the present invention will be described.
In the present embodiment, the pixel arrangement of the CCD is as shown in FIG. The difference from the first embodiment is that the arrangement of the color filters is the same for odd data and even data. The only difference in the circuit configuration from FIG. 2 of the first embodiment is the internal configuration of the signal synthesis circuit 158. FIG. 5 shows a signal synthesis circuit 158 according to the second embodiment.
[0021]
In FIG. 5, the outputs of the low-pass filters 128 to 131 in FIG. 2 correspond to the signals 301 to 304, the outputs of the field memory 157 correspond to the signals 305 and 306, and the outputs of the 1H memories 109 and 110 correspond to the signals 307 and 308. I do.
Since there is a one-field phase difference between the signals 305 and 306 and the signals 307 and 308, when the signals 305 and 306 are the n-th line in FIG. 4, the signals 307 and 308 correspond to the (n + 263) -th line.
The signals 305 and 307 are sent to the selectors 309 and 310. At this time, since the signals 305 and 307 have the same phase of Ye and Cy, the signal 305 is delayed by one pixel by the clock CLK by the delay unit 321, and the order of the signal 307 and Ye and Cy after one field is alternated. To do. Next, the selectors 309 and 310 are switched for each pixel so that the Ye component is obtained at the output of the selector 309 and the Cy component is obtained at the output of the selector 310. Also for the signals 306 and 308, the signal 306 is delayed by one pixel by the delay unit 322, and by the same operation as described above, the Mg component is obtained at the output of the selector 311 and the G component is obtained at the output of the selector 312. .
[0022]
By interpolating between fields in this manner, the number of pixels of each color component in the horizontal direction can be doubled to improve the resolution.
The selectors 313 to 316 switch between the data 301 to 304 obtained by performing the conventional interpolation in the line and the outputs of the selectors 309 to 312 as necessary.
The processing after obtaining the Ye, Cy, Mg, and G components as described above is the same as in the conventional example of FIG.
As described above, in the first and second embodiments, the configuration is such that the imaged video signal and the video signal one field before are synthesized, and if the synthesized signal is subjected to matrix operation, a wideband RGB signal can be obtained. , And a high-definition image that can withstand multimedia can be obtained.
In particular, there is an effect that a wideband digital RGB output can be obtained in a system using a non-addition reading type CCD.
Further, in a system using a multi-pixel CCD that outputs a plurality of color signals in a dot-sequential manner, there is an effect that a band digital RGB output that can withstand multimedia can be obtained.
[0023]
【The invention's effect】
As described above, according to the present invention, an object is imaged by using an independent filter for every two lines for each field, and the image signals of the first field and the second field by interlacing are converted to dot sequential. Are output every two lines as a plurality of output color signals, the output color signals of the first field are delayed by one field, and the delayed color signals of the first field and each color of the second field are delayed. The signals are switched in the line direction with respect to all the color signals on a pixel-by-pixel basis and output, and an inter-field interpolation process is performed. Thus, even if an object is imaged using an imaging unit having an independent two-line filter for each field, a high-resolution video signal in the horizontal direction can be obtained with a simple configuration.
[Brief description of the drawings]
FIG. 1 is a block diagram conceptually showing an embodiment of the present invention.
FIG. 2 is a block diagram showing a first embodiment of the present invention.
FIG. 3 is a circuit diagram showing a signal synthesis circuit used in the first embodiment.
FIG. 4 is a configuration diagram showing a pixel arrangement of a CCD used in a second embodiment of the present invention.
FIG. 5 is a circuit diagram showing a signal synthesis circuit used in a second embodiment.
FIG. 6 is a block diagram showing a conventional imaging device.
FIG. 7 is a configuration diagram showing a pixel arrangement of a CCD used in the conventional and the first embodiment.
[Explanation of symbols]
1, 101 Image sensor 5, 157 Field memory 6, 7, 158 Signal synthesis circuit

Claims (4)

The subject is imaged by using an independent filter for every two lines for each field, and image signals of the first field and the second field by interlacing are output every two lines as a plurality of dot-sequential color signals. Imaging means for performing
Delay means for delaying the plurality of color signals of the first field obtained from the imaging means by one field;
Switching output means for switching and outputting each color signal of the second field and each color signal of the first field delayed by the delay means in a line direction for all color signals in a line direction. An imaging device characterized by the following. Interpolating means for performing intra-field interpolation processing on each color signal in the first and second fields output from the imaging means;
An output unit that selectively outputs one of a color signal output by the switching output unit and a color signal that is subjected to intra-field interpolation processing and output by the interpolation unit;
The imaging device according to claim 1, further comprising: 3. The image pickup apparatus according to claim 1, wherein the plurality of color signals are digital signals of Ye, Cy, Mg, and G, respectively. The subject is imaged by using an independent filter for every two lines for each field, and image signals of the first field and the second field by interlacing are output every two lines as a plurality of dot-sequential color signals. An imaging step to be performed;
A delay step of delaying the plurality of color signals of the first field obtained in the imaging step by one field;
A switching output step of switching and outputting each color signal of the second field and each color signal of the first field delayed in the delay step in a line direction for all the color signals in a line unit. Imaging method.

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