JPH02305194A - Video signal processor - Google Patents
Video signal processorInfo
- Publication number
- JPH02305194A JPH02305194A JP1124557A JP12455789A JPH02305194A JP H02305194 A JPH02305194 A JP H02305194A JP 1124557 A JP1124557 A JP 1124557A JP 12455789 A JP12455789 A JP 12455789A JP H02305194 A JPH02305194 A JP H02305194A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 22
- 239000011159 matrix material Substances 0.000 description 12
- 238000007792 addition Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 240000004307 Citrus medica Species 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Processing Of Color Television Signals (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、単板式固体撮像手段を備えるカラービデオカ
メラやカラースチルビデオカメラのビデオ１３号処理装
置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a video No. 13 processing device for a color video camera or a color still video camera equipped with a single-plate solid-state imaging means.
〔従来の技術）
従来この種の装置においては、例えば第２図に示すよう
な色フィルタ、すなわちマゼンタＭｇ。[Prior Art] Conventionally, in this type of apparatus, a color filter such as that shown in FIG. 2, that is, magenta Mg, has been used.
シアンＣｙ．イエローＹｅ，グリーンＧｒのフィルタを
装着した撮像素子からの信号に、第３図に承すような信
号処理を施すことで、最終的に輝度信号Ｙと２つの色差
イハ号Ｒ−’／、Ｂ−Ｙを得る１法が提案されでいる。Cyan Cy. By applying signal processing as shown in Fig. 3 to the signals from the image sensor equipped with yellow Ye and green filters, the final result is a luminance signal Y and two color difference numbers R-'/B. -Y has been proposed.
第３図のブロック１２１により従来例の動作を説明すれ
ば７ レンズ１によって固体撮像素子２上１７投影さ４
１だ不図小の被写体像は固体抛像素ｆ−２Ｓおいで光電
変換され、映像信５．ＳＳ 、として読み出される。読
み出された信号Ｓ、はＡ Ｇ Ｃ（ａｔ＋ｔｏｌｌｌａ
Ｌｉｃｇａｉｎ ｃｏｎｔｒｏｌ）アン７゛３で振幅な
ｙ、ｌ整ｓわ１（１５号−３２）、その後、色フィルタ
の繰り返し１、：よるキヘ・リア成分を取り除きかつ輝
度の低域成分を取り除くための帯域通過フィルタ１，８
を通り高域輝度イ；Ｘ号Ｙｌｌどされる。The operation of the conventional example can be explained using block 121 in FIG.
A small object image is photoelectrically converted by a solid-state image element f-2S, and a video signal 5. It is read out as SS. The read signal S is AGC(at+tolla
Licgain control) Amplitude y, l adjustment switch 1 (No. 15-32) at 7.3, then repeat 1 of the color filter: to remove the rear component and the low-frequency component of luminance. Bandpass filter 1, 8
The high-frequency luminance A;
信号Ｓ２はまた水ト及び小面の補間処理を行う２次元補
間フィルタ７〜１０によってそ、１″１．ｆわＭｇ、Ｃ
ｙ、Ｙｅ、Ｏｒの各色信号とされ１； 後ＲＧＢ変換マ
トリックス１９に人力される。The signal S2 is also processed by two-dimensional interpolation filters 7 to 10 for interpolating water and facets.
Each color signal of y, Ye, and Or is converted to 1; and then manually inputted to an RGB conversion matrix 19.
ＲＧＢ変換変換マリックス１９では、Ｍｇ、Ｃｙ、Ｙｅ
、Ｇｒの４つの色１３号から、マ］・リツクス演算！Ａ
埋、即ら、
によ−）でＲ，Ｇ、Ｂの各原色信↓Ｊを得る。ただしａ
ｉ、ｊは（３ｘ４）の〜次７トリツクスである。In RGB conversion conversion Marix 19, Mg, Cy, Ye
, Ma]ricks operation from the four colors No. 13 of Gr! A
Fill, i.e., by) to obtain R, G, and B primary color signals ↓J. However, a
i and j are (3x4) ~th order 7 tricks.
Ｒ，ホワイトバランス回路（以下ＲＷＢ）１２および１
３ホワイトバランス回路（以Ｆ−ａｗｓ）ｎ３におい千
Ｇ信号を基準としてＲ（２号及びＢ信号の振幅がＡ？さ
れ、得られたＲ１′信号、Ｂ′信号及びＧイ、１号がガ
ンマ変、換回路１４，２０．１５でガンマ変換−ｃ”ｓ
れＦｔ’、Ｂ’、ｒａｙをｉニア ル。R, white balance circuit (hereinafter referred to as RWB) 12 and 1
3 white balance circuit (F-aws) n3, the amplitudes of the R (No. 2 and B signals) are A? using the 1,000 G signal as a reference, and the obtained R1' signal, B' signal, G, and No. 1 are gamma Gamma conversion by conversion circuits 14 and 20.15 -c”s
Set Ft', B', and ray to i.
Ｒ’、Ｏｒ、Ｂｒは色差マｈ ’Ｊ ックス回路２１を
ほどこされ、低域輝度信号Ｙ４１１色差信号Ｒ−Ｙ、Ｂ
−￥信号が出力される。ただしｂｌｊは（３Ｘ３）の−
次マ［・リックスである。Ｙ、イ５−号は加算回路２２
で高ｔｆ４輝度信号Ｙ□信号と加算さね、輝度信号Ｙと
して出力される。R', Or, and Br are provided with a color difference mask circuit 21, and the low-band luminance signal Y411 color difference signals R-Y, B
-\ signal is output. However, blj is (3X3) -
The next one is Ma [Rix. Y, A5- is the adder circuit 22
It is added to the high tf4 luminance signal Y□ signal and output as the luminance signal Y.
１）η述の従来例の色信号処理回路（ｄ、色再現性が良
好であり、かつエツジ部の偽色信号の発生・ｂ少ないと
いう利点を４３しでいるが、ＲＧＢ変換回路１１及び色
差マトリックス回路２！における演算Ｉｉｔが多く７ア
ナログイ、ζ号処Ｆｌ！ 、ディジタル信号処理の何れ
によっても回路規模が人きく、また消費′Ｉｔ力も大き
いという聞届をイＪ’ Ｌ／でいる。1) The conventional color signal processing circuit described in η (d) has the advantages of good color reproducibility and less generation of false color signals at the edges, but the RGB conversion circuit 11 and color difference It has been reported that the matrix circuit 2! has a large number of calculations, 7 analog circuits, ζ processor Fl!, and digital signal processing, which increases the circuit size and consumes a large amount of power.
本発明は、この問題を解消するためになされたｔ）ので
、従来例の利点を損なわずに、回路規模や消費′？；Ｌ
力な小さくすることのできるビデオ信号処理装置を提供
することを１！的とするものである。The present invention has been made to solve this problem, so that it can improve the circuit size and consumption without sacrificing the advantages of the conventional example. ;L
1. To provide a video signal processing device that can be made small and powerful! The target is
Ｃ課題を解決するための１２段）
本発明は、１〕「記１］的を達成するため、ビデオ１５
号処理装置をつぎの（１）、（２）、（３）のとおりに
構成するものである。12 stages for solving problem C) The present invention provides video 15
The code processing device is configured as shown in (1), (2), and (3) below.
（１）撮像素子から繰り返！、ノ読み出される３種類駄
Ｉ−の色４３号を入力信号とし、輝度信号と２種類の色
差イ、−号を出力するビデオイニ↓Ｊ処理装置であって
、話入力信号を輝度信号に変換１“る第１の手段と、該
人カイ８１叶から２独類の原色信号を生成する第２の丁
１段と、第２の手段から得られた２種類の原色信号の丼
々と第１の手段から得られた輝度信号との間で差分をと
９２柚類の色差４５号を生成する第３の１段とを備えた
ビデ信号処理装置。(1) Repeat from the image sensor! This is a video input ↓J processing device which takes as an input signal the color No. 43 of three types of I- read out, and outputs a luminance signal and two types of color difference A and -. a second stage for generating two unique primary color signals from the first means; a second stage for generating two unique primary color signals from the second means; A video signal processing device comprising: a third stage for generating a difference between the brightness signal obtained from the means of the first embodiment and a third stage for generating a color difference No. 45 of 92 citrons.
（２）航記（１）において、第１のｆ段は、ガンマ変換
回路と、色信号の綬り返しによるキャリア成分を取り除
く第１の低域通過フィルタと、色差信号の帯域幅に輝度
信号を帯域制限する第２の低域通過フィルタとをイ■し
ていて、第１の低域連通フィルタを介して外部に輝度信
−号を出力し、第２の低域通過フィルタな介１ノで第３
のｆ段に輝度信号を供給するように１ノだビデオ信号処
理装置。(2) In (1), the first f-stage includes a gamma conversion circuit, a first low-pass filter that removes the carrier component due to oscillation of the chrominance signal, and a luminance signal in the bandwidth of the chrominance signal. The luminance signal is output to the outside via the first low-pass communication filter, and the second low-pass filter is connected to And the third
1 node to supply the luminance signal to the f-stage of the video signal processing device.
（３Ｎｉｆ記（１）又は（２）において、第２の手段は
、補間フィルタと、２神類の原色信号に対しホワイトバ
ランス処理を施す手段と、２４４類の原色信号に対しガ
ンマ変換処理を施す手段とを有しているビデオ信号処理
装置。(In 3Nif (1) or (2), the second means includes an interpolation filter, a means for performing white balance processing on the primary color signals of the two divine classes, and a means for performing gamma conversion processing on the primary color signals of the 244 classes. A video signal processing apparatus comprising means.
前記（１）、（２）、（３）の構成により、従来例と比
べて、第２の手段におけるマトリックス演算の演算回数
が減り、第３の手段でマトリックス演算が不要となって
、回路規模、消費電力が小さくなる。With the configurations (1), (2), and (3) above, compared to the conventional example, the number of matrix operations in the second means is reduced, matrix operations are not required in the third means, and the circuit scale is reduced. , power consumption is reduced.
以下、実施例により本発明の詳細な説明する。 Hereinafter, the present invention will be explained in detail with reference to Examples.
第１図は本発明の一実施例のビデオ信号処理装置を示す
ブロック図であり、第３図の従来例と同様の機能部分に
は同一符号を付して説明は省略する。図中、４はガンマ
変換回路、５は第１の低域通過フィルタ、６は第２の低
域通過フィルタ、１１はＲＢ変換回路、１６．１７は減
算回路である。図にしたがって動作を説明すると、レン
ズ１によって固体撮像素子２上に投影された不図示の被
写体像が固体撮像素子２において光電変換され映像信号
Ｓ１として読み出され、読み出されたイ１）号Ｓ、が、
ＡＧＣアンプ３で振幅を調整され（１１１号Ｓ２）るの
は従来例と同様である。信号Ｓ２はガンマ変換回路４で
ガンマ変換をほどこされ（信−号Ｓ３）、第１の低域通
過フィルタ５で色フィルタの繰り返しによるキャリア成
分を取り除かＪ１輝度信号Ｙ′として外部に出力される
。また信号Ｓ３は第２の低域通過フィルタ６によって色
信号の帯域まで帯域制限され低域輝度信号ＹＬ′とされ
減算回路１６．１７へ供給される。FIG. 1 is a block diagram showing a video signal processing apparatus according to an embodiment of the present invention, and functional parts similar to those of the conventional example shown in FIG. In the figure, 4 is a gamma conversion circuit, 5 is a first low-pass filter, 6 is a second low-pass filter, 11 is an RB conversion circuit, and 16.17 is a subtraction circuit. To explain the operation according to the figure, a subject image (not shown) projected onto the solid-state image sensor 2 by the lens 1 is photoelectrically converted in the solid-state image sensor 2 and read out as a video signal S1. S, but
The amplitude is adjusted by the AGC amplifier 3 (No. 111 S2) as in the conventional example. The signal S2 is subjected to gamma conversion in a gamma conversion circuit 4 (signal S3), and a carrier component resulting from repeated color filtering is removed in a first low-pass filter 5, and the signal is outputted to the outside as a J1 luminance signal Y'. Further, the signal S3 is band-limited to the chrominance signal band by the second low-pass filter 6, and is converted into a low-band luminance signal YL' and supplied to subtraction circuits 16 and 17.
信号Ｓ２はまた水平及び垂直の補間処理を行う２次元補
間フィルタ７〜ｌＯによりてそれぞれＭｇ、Ｃｙ、Ｙｅ
、Ｏｒの各色信号とされることも従来例と同様であるが
、各色信号Ｍｇ、ｃｙ。The signal S2 is also processed by two-dimensional interpolation filters 7 to 1O that perform horizontal and vertical interpolation processing to obtain Mg, Cy, and Ye, respectively.
, Or, as in the conventional example, but the color signals Mg, cy.
Ｙｅ、ＯｒはＲＢ変換回路１１に入力され、ＲＢ変換マ
トリックス演算処理、即ち、によってＲ，Ｂの同厚色信
号を得る。ただし、Ｃ１ｊは（２ｘ４）の−次マトリッ
クスである。信号Ｒ，ＢはＲＷＢ１２およびＢＷＢ１３
においてホワイトバランスを取られ、Ｒ’ 、Ｂ’ と
された後、ガンマ変換回路１４．１５でガンマ変換を施
されＲｒ、Ｂｒとされ、減算回路１６．１７で低域輝度
信号Ｙ１、′を差し引がれ、同色差信号Ｒ−Ｙ’ 、Ｂ
−Ｙ、、’ を得る。Ye and Or are input to the RB conversion circuit 11, and the same thick color signals of R and B are obtained through RB conversion matrix calculation processing. However, C1j is a (2x4) -dimensional matrix. Signals R and B are RWB12 and BWB13
After the white balance is taken at , and R' and B' are obtained, gamma conversion is performed in gamma conversion circuit 14.15 to obtain Rr and Br, and low-range luminance signals Y1 and ' are added in subtraction circuit 16. Same color difference signal R-Y', B
-Y,,' is obtained.
以上の構成によって、輝度４５号Ｙ′および同色差信号
Ｒ−Ｙ’ 、Ｂ−Ｙ’を１！するが、従来例と本実施例
の演算規模を比較してみると、従来例のＫＧＢ変換回路
の（３Ｘ４）マトリックス演算に対して、本実施例のＲ
Ｂ変換回路では（２Ｘ４）マトリックス演算であり、ま
た色差マトリックス回路２１の（３Ｘ３）マトリックス
演算にたいして本実施例では減算回路２つで色差信号を
１ｒＦている。With the above configuration, the luminance No. 45 Y' and the same color difference signals R-Y' and B-Y' are set to 1! However, when comparing the calculation scale of the conventional example and this example, it is found that the R of this example is
The B conversion circuit performs a (2×4) matrix operation, and in contrast to the (3×3) matrix operation of the color difference matrix circuit 21, in this embodiment, the color difference signal is converted to 1 rF using two subtraction circuits.
ちなみに（２ｘ４）マトリックス演算の演算回数は、８
回の乗算及び６回の加減算であり、（３Ｘ４）マトリッ
クス演算では１２回の乗算及び９回の加減算、（３Ｘ３
）マトリックス演算では９回の乗算及び６回の加減算と
なるので、従来例では２１回の乗算及び１５回の加減算
が必要であるのにたいして、本実施例では８回の乗算及
び８回の加減算しか必要とせず、従来例の帯域通過フィ
ルタ１個にたいして、低域通過フィルタが２個に増加し
ているが、全体としては大幅な演算回数の削減ができる
。このため回路規模及び消費電力の削減が可能となり、
また演算時の誤差の発生回数が減少するためＳ／Ｎ比の
改善が可能となった。By the way, the number of operations for (2x4) matrix operation is 8.
(3x4) matrix operation requires 12 multiplications, 9 additions/subtractions, (3x3)
) Matrix operation requires 9 multiplications and 6 additions/subtractions, so while the conventional example requires 21 multiplications and 15 additions/subtractions, this embodiment only requires 8 multiplications and 8 additions/subtractions. Although the number of low-pass filters is increased to two compared to one band-pass filter in the conventional example, the overall number of calculations can be significantly reduced. This makes it possible to reduce circuit size and power consumption.
Furthermore, since the number of errors occurring during calculation is reduced, it is possible to improve the S/N ratio.
また本実施例ではＭｇ、Ｃｙ、Ｙｅ、Ｇｒの４種類の色
フィルタを装着した場合について述べたが、本発明は、
前記組み合せ以外の色フィルタ、例えばＭｇ、Ｃｙ、Ｇ
ｒの３色ストライブフィルタなどに通用してもよいこと
は言うまでもない。Furthermore, in this embodiment, a case was described in which four types of color filters, Mg, Cy, Ye, and Gr, were installed, but the present invention
Color filters other than the above combinations, such as Mg, Cy, G
Needless to say, it may also be used as a three-color stripe filter.
以上説明したように、本発明によりば、従来例の持つ良
好な色再現性や偽色信号が少ないという特徴を損なうこ
となく、回路規模及び消費電力を小さくでき、Ｓ／Ｎ比
を改善することができる。As explained above, according to the present invention, the circuit scale and power consumption can be reduced and the S/N ratio can be improved without impairing the characteristics of the conventional example, such as good color reproducibility and few false color signals. I can do it.
第１図は本発明の 実り例を示すブロック図、第２図は
色フィルタの配列を示す図、第３［〆ｌは従来例のブロ
ック図である。
４．１４．１！５・・・・・・ガンマ変換回路５・・・
・・・’：ｌ’Ｘ１のイｌ（域通過フィルタ６・・・・
・・第２の低域道通フィルタ７−１０・・・−・・２次
元補間フィルタ１１・・・・−ＲＢ変換回路FIG. 1 is a block diagram showing a practical example of the present invention, FIG. 2 is a diagram showing an arrangement of color filters, and FIG. 3 is a block diagram of a conventional example. 4.14.1!5... Gamma conversion circuit 5...
...': l'X1's I (pass filter 6...
...Second low-pass pass filter 7-10...-Two-dimensional interpolation filter 11...-RB conversion circuit
Claims (3)
色信号を入力信号とし、輝度信号と２種類の色差信号を
出力するビデオ信号処理装置であって、該入力信号を輝
度信号に変換する第１の手段と、該入力信号から２種類
の原色信号を生成する第２の手段と、第２の手段から得
られた２種類の原色信号の各々と第１の手段から得られ
た輝度信号との間で差分をとり２種類の色差信号を生成
する第３の手段とを備えたことを特徴するビデ信号処理
装置。(1) A video signal processing device that takes as input signals three or more types of color signals repeatedly read out from an image sensor and outputs a luminance signal and two types of color difference signals, the first video signal processing device converting the input signal into a luminance signal. means for generating two types of primary color signals from the input signal, each of the two types of primary color signals obtained from the second means and a luminance signal obtained from the first means; and a third means for generating two types of color difference signals by taking a difference between the signals.
返しによるキャリア成分を取り除く第１の低域通過フィ
ルタと、色差信号の帯域幅に輝度信号を帯域制限する第
２の低域通過フィルタとを有していて、第１の低域通過
フィルタを介して外部に輝度信号を出力し、第２の低域
通過フィルタを介して第３の手段に輝度信号を供給する
ようにしたことを特徴とする請求項１記載のビデオ信号
処理装置。(2) The first means includes a gamma conversion circuit, a first low-pass filter that removes carrier components due to repetition of color signals, and a second low-pass filter that limits the band of the luminance signal to the bandwidth of the color difference signal. filter, the luminance signal is output to the outside via the first low-pass filter, and the luminance signal is supplied to the third means via the second low-pass filter. The video signal processing device according to claim 1, characterized in that:
号に対しホワイトバランス処理を施す手段と、２種類の
原色信号に対しガンマ変換処理を施す手段とを有してい
ることを特徴とする請求項１又は請求項２記載のビデオ
信号処理装置。(3) The second means includes an interpolation filter, means for performing white balance processing on the two types of primary color signals, and means for performing gamma conversion processing on the two types of primary color signals. The video signal processing device according to claim 1 or claim 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1124557A JPH02305194A (en) | 1989-05-19 | 1989-05-19 | Video signal processor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1124557A JPH02305194A (en) | 1989-05-19 | 1989-05-19 | Video signal processor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02305194A true JPH02305194A (en) | 1990-12-18 |
Family
ID=14888429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1124557A Pending JPH02305194A (en) | 1989-05-19 | 1989-05-19 | Video signal processor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02305194A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003047021A (en) * | 2001-07-31 | 2003-02-14 | Matsushita Electric Ind Co Ltd | Image processing apparatus |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61186094A (en) * | 1985-02-14 | 1986-08-19 | Hitachi Ltd | Signal processing circuit for color video camera |
| JPS63226188A (en) * | 1986-12-15 | 1988-09-20 | Matsushita Electric Ind Co Ltd | Solid-state image pickup device |
| JPS6455995A (en) * | 1987-08-27 | 1989-03-02 | Canon Kk | Automatic white balance correcting device |
| JPS6478092A (en) * | 1987-09-18 | 1989-03-23 | Victor Company Of Japan | Video signal processing circuit for color camera |
-
1989
- 1989-05-19 JP JP1124557A patent/JPH02305194A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61186094A (en) * | 1985-02-14 | 1986-08-19 | Hitachi Ltd | Signal processing circuit for color video camera |
| JPS63226188A (en) * | 1986-12-15 | 1988-09-20 | Matsushita Electric Ind Co Ltd | Solid-state image pickup device |
| JPS6455995A (en) * | 1987-08-27 | 1989-03-02 | Canon Kk | Automatic white balance correcting device |
| JPS6478092A (en) * | 1987-09-18 | 1989-03-23 | Victor Company Of Japan | Video signal processing circuit for color camera |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003047021A (en) * | 2001-07-31 | 2003-02-14 | Matsushita Electric Ind Co Ltd | Image processing apparatus |
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