JPH0828878B2 - White balance adjuster - Google Patents

White balance adjuster

Info

Publication number
JPH0828878B2
JPH0828878B2 JP2080102A JP8010290A JPH0828878B2 JP H0828878 B2 JPH0828878 B2 JP H0828878B2 JP 2080102 A JP2080102 A JP 2080102A JP 8010290 A JP8010290 A JP 8010290A JP H0828878 B2 JPH0828878 B2 JP H0828878B2
Authority
JP
Japan
Prior art keywords
color
evaluation value
screen
color evaluation
white balance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP2080102A
Other languages
Japanese (ja)
Other versions
JPH03219790A (en
Inventor
俊宣 春木
健一 菊地
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP2080102A priority Critical patent/JPH0828878B2/en
Priority to US07/612,831 priority patent/US5442408A/en
Priority to CA002030142A priority patent/CA2030142C/en
Priority to EP90121976A priority patent/EP0433672B1/en
Priority to EP95119590A priority patent/EP0711082B1/en
Priority to DE69027751T priority patent/DE69027751T2/en
Priority to ES90121976T priority patent/ES2091784T3/en
Priority to EP95119589A priority patent/EP0708569B1/en
Priority to DE69033743T priority patent/DE69033743T2/en
Priority to DE69033744T priority patent/DE69033744T2/en
Priority to KR1019900018624A priority patent/KR100196305B1/en
Publication of JPH03219790A publication Critical patent/JPH03219790A/en
Priority to US08/360,987 priority patent/US5489939A/en
Priority to US08/454,835 priority patent/US5555022A/en
Publication of JPH0828878B2 publication Critical patent/JPH0828878B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Description

【発明の詳細な説明】 (イ)産業上の利用分野 本発明は、撮像素子から得られる撮像映像信号を基
に、白バランスの制御を行うカラービデオカメラの自動
白バランス調整装置に関する。
TECHNICAL FIELD The present invention relates to an automatic white balance adjusting device for a color video camera, which controls white balance based on an imaged video signal obtained from an image pickup device.

(ロ)従来の技術 カラービデオカメラに於いては、光源による光の波長
分布の違い補正するために、白バランスの制御を行う必
要がある。
(B) Conventional Technology In a color video camera, it is necessary to control the white balance in order to correct the difference in the wavelength distribution of light from the light source.

この制御は、赤(以下R)、青(以下B)、緑(以下
G)の三原色信号の比が1:1:1となるように、各色信号
の利得を調整することで行われる。一般には例えば特開
昭62−35792号公報(H04N9/73)に示される様に、画面
の色差信号R−Y、B−Yの積分値が零になるように利
得を調節する方式が用いられている。
This control is performed by adjusting the gain of each color signal so that the ratio of the three primary color signals of red (hereinafter R), blue (hereinafter B), and green (hereinafter G) is 1: 1: 1. Generally, for example, as shown in JP-A-62-35792 (H04N9 / 73), a method of adjusting the gain so that the integrated value of the color difference signals RY and BY of the screen becomes zero is used. ing.

第4図は、この方式を用いた白バランス回路のブロッ
ク図である。
FIG. 4 is a block diagram of a white balance circuit using this method.

レンズ(1)を通過した光は、撮像素子(CCD)
(2)で光電変換された後、色分離回路(3)で、R、
G、Bの3原色信号として取り出される。R増幅回路
(4)、B増幅回路(5)を経て、カメラプロセス及び
マトリックス回路(6)に入力され、輝度信号Y、赤及
び青それぞれの色差信号R−Y、B−Yが作られて、ビ
デオ回路へ送られる。同時に、二つの色差信号は、それ
ぞれ積分回路(17)(18)で、十分に長い時間、積分さ
れ、その結果が零になるように利得制御回路(13)、
(14)がR、B各々の利得可変な増幅回路(4)、
(5)の利得を調節する。
The light that has passed through the lens (1) is the image sensor (CCD).
After photoelectric conversion in (2), R,
It is taken out as three primary color signals of G and B. After passing through the R amplifier circuit (4) and the B amplifier circuit (5), they are input to the camera process and matrix circuit (6), and the luminance signal Y and the color difference signals RY and BY of red and blue are produced. , Sent to the video circuit. At the same time, the two color difference signals are integrated by the integrating circuits (17) and (18) for a sufficiently long time, and the gain control circuit (13) and
(14) is an amplifier circuit (4) with variable gain for R and B,
Adjust the gain in (5).

(ハ)発明が解決しようとする課題 前述の方式はビデオカメラにより撮影される画面の様
々な色分布に対して、積分回路(17)(18)の時定数を
長くする等の工夫を施して、これらの色分布を平均化す
れば、色分布を構成する各色成分が打ち消し合い、略白
い画面状態に近似できることを前提としている。
(C) Problems to be Solved by the Invention The above-mentioned method has been devised such that the time constants of the integrating circuits (17) and (18) are lengthened for various color distributions of the screen shot by the video camera. It is premised that if these color distributions are averaged, the color components that make up the color distributions cancel each other out and that a substantially white screen state can be approximated.

ところが、この方式では、被写体自体の色に偏りがあ
る時、例えば、緑の芝生や青い空が画面上で大きな面積
を占める場合や、赤いセータを着た人物をクローズアッ
プする場合等では、画面全体の色分布を平均化しても白
い画面状態とはならず白バランスがくずれることにな
り、この様な被写体に対して前述の如き白バランス調整
を施せば、偏った色を打ち消す方向に利得が変化して白
バランスがその補色側にずれて、適正な色の再現が行な
えなくなるという欠点を有している。
However, with this method, when there is a bias in the color of the subject itself, for example, when a green grass or blue sky occupies a large area on the screen, or when a person wearing a red sweater is close up, Even if the entire color distribution is averaged, the white screen will not be displayed and the white balance will be lost.If such white balance adjustment is applied to such a subject, the gain will be canceled in the direction of canceling the uneven color. There is a drawback that the white balance changes and the white balance shifts to the complementary color side, and proper color reproduction cannot be performed.

(ニ)課題を解決するための手段 本発明は、撮像映像信号中の色情報信号を基に白バラ
ンス調整を行うものであり、撮像画面内で色情報信号レ
ベルの変動量が所定量を下回る領域での色情報信号の白
バランス調整への寄与を他の領域より軽減させることを
特徴とする。
(D) Means for Solving the Problems The present invention is for performing white balance adjustment based on a color information signal in an imaged video signal, and the variation amount of the color information signal level in the imaged screen is below a predetermined amount. It is characterized in that the contribution of the color information signal in the area to the white balance adjustment is reduced as compared with other areas.

また、撮像画面を分割して設定された複数の領域毎の
色情報信レベルを各色の色評価値として検出し、これら
の色評価値に各領域毎に重み付け量にて重み付けを行
い、この重み付け後の各評価値より画面全体の色評価値
を画面色評価値として算出し、これを基に各色信号の増
幅利得を調整するに際して、色評価値の変動量が所定量
を下回る領域が画面の水平または垂直方向に連続して存
在する場合には、これらの領域での重み付け量を他の領
域に比べて小さくすることを特徴とする。また、別の手
段として前記領域の大きさに応じて前記増幅利得の調整
速度を多段階に変化させたり、利得調整を中止すること
を特徴とする。
In addition, the color information signal level of each of a plurality of areas set by dividing the imaging screen is detected as a color evaluation value of each color, and these color evaluation values are weighted by a weighting amount for each area. The color evaluation value of the entire screen is calculated as the screen color evaluation value from each of the subsequent evaluation values, and when the amplification gain of each color signal is adjusted based on this, the area where the variation amount of the color evaluation value falls below the predetermined amount is When they continuously exist in the horizontal or vertical direction, the weighting amount in these areas is smaller than that in other areas. Further, as another means, the adjustment speed of the amplification gain is changed in multiple stages according to the size of the region, or the gain adjustment is stopped.

(ホ)作用 本発明は、上述の如く構成したので、同一色、大面積
の被写体が画面に含まれる場合にも、この被写体の白バ
ランス調整への影響を軽減して、白バランスがその被写
体の補色側へずれることを防ぐことが可能となる。
(E) Action Since the present invention is configured as described above, even when a subject having the same color and a large area is included in the screen, the influence of the subject on the white balance adjustment is reduced and the white balance is adjusted to that subject. It is possible to prevent the shift to the complementary color side.

(ヘ)実施例 図面に従い本発明の実施例について説明する。(F) Embodiments Embodiments of the present invention will be described with reference to the drawings.

第1図は本実施例による自動白バランス回路の回路ブ
ロック図である。
FIG. 1 is a circuit block diagram of an automatic white balance circuit according to this embodiment.

レンズ(1)を通過した光は、CCD(2)上に結像さ
れて光電変換された後、色分離回路(3)にて、R、
G、Bの3原色信号として取り出される。これらの3原
色信号の中のR及びB信号は、夫々R及びB増幅回路
(4)(5)を経て、G信号と共にカメラプロセス及び
マトリックス回路(6)に入力され、これらを基に輝度
信号(Y)及び赤、青夫々の色差信号(R−Y)、(B
−Y)が作成されて、ビデオ回路(7)に供給されて周
知の処理が施される。また、(Y)(R−Y)(B−
Y)の各信号は、同時に選択回路(21)にも供給され
る。
The light passing through the lens (1) is imaged on the CCD (2) and photoelectrically converted, and then R,
It is taken out as three primary color signals of G and B. The R and B signals of these three primary color signals are input to the camera process and matrix circuit (6) together with the G signal through the R and B amplifier circuits (4) and (5), respectively, and the luminance signal is based on these signals. (Y) and color difference signals (RY) of red and blue (B)
-Y) is created and supplied to the video circuit (7) for known processing. In addition, (Y) (RY) (B-
Each signal of Y) is simultaneously supplied to the selection circuit (21).

選択回路(21)はタイミング回路(25)からの選択信
号(S1)により輝度信号(Y)及び色差信号(R−
Y)、(B−Y)の3信号の中の1つを1フィールド毎
に順次選択するもので、(Y)→(R−Y)→(B−
Y)→(Y)→(R−Y)→…と1フィールド毎に後段
のA/D変換器(22)に出力される。尚、選択信号(S1)
は後述の如く同期分離回路(24)から得られる垂直同期
信号に基づいて作成される。
The selection circuit (21) receives the luminance signal (Y) and the color difference signal (R−) according to the selection signal (S1) from the timing circuit (25).
One of the three signals of (Y) and (BY) is sequentially selected for each field. (Y) → (RY) → (BY
Y) → (Y) → (RY) → ... Is output to the A / D converter (22) in the subsequent stage for each field. The selection signal (S1)
Is created based on the vertical sync signal obtained from the sync separation circuit (24) as described later.

A/D変換器(22)は、所定のサンプリング周期で選択
回路(21)にて選択された信号(Y)(R−Y)(B−
Y)の1つをサンプリングしてディジタル値に変換し、
この値を積分器(23)に出力する。ところで、タイミン
グ回路(25)はカメラプロセス及びマトリックス回路
(6)からの垂直、水平同期信号及びCCD(2)を駆動
する固定の発振器出力に基づいて、撮像画面を第2図に
示す8×8の64個の同一面積の長方形の領域(A11)、
(A12)、(A13)…(Aij)(i,j=1〜8の整数)に分
割して各領域毎にこれらの領域内の選択回路(21)出力
を時分割で取り出すための切換信号(S2)を積分器(2
3)に出力する。
The A / D converter (22) has signals (Y) (RY) (B- selected by the selection circuit (21) at a predetermined sampling cycle.
Sampling one of Y) and converting it to a digital value,
This value is output to the integrator (23). By the way, the timing circuit (25) displays the image pickup screen on the basis of the vertical and horizontal synchronizing signals from the camera process and the matrix circuit (6) and the fixed oscillator output for driving the CCD (2), and the 8 × 8 image screen is shown in FIG. 64 rectangular areas of the same area (A11),
(A12), (A13) ... (Aij) (i, j = 1 to an integer of 1 to 8), and a switching signal for extracting the output of the selection circuit (21) in each area by time division for each area. (S2) is the integrator (2
Output to 3).

積分器(23)は切換信号(S2)を受けて、選択回路
(21)出力のA/D変換値を領域毎に1フィールド期間に
わたって加算し、即ち64個の領域毎にディジタル積分
し、この1フィールド分の積分が完了すると、この積分
値を輝度評価値あるいは色評価値としてメモリ(26)に
保持する。この結果、ある任意のフィールドで64個の領
域内に対応する輝度信号(Y)のディジタル積分値が64
個の輝度評価値(yij)(i,j:1〜8)として得られるこ
とになる。また、次のフィールドでは選択回路(21)に
て色差信号(R−Y)が選択されているので、積分器
(23)の各領域における積分の結果、色差信号(R−
Y)の領域毎のディジタル積分値が64個の色評価値(ri
j)として得られる。更に次のフィールドでは選択回路
(21)にて色差信号(B−Y)が選択されているので、
積分器(23)の積分の結果、色差信号(B−Y)の領域
毎のディジタル積分値が64個の色評価値(bij)として
得られる。こうして、輝度信号(Y)、色差信号(R−
Y)(B−Y)の3フィールドの積算が終了した時点
で、輝度評価値(yij)及び色評価値(rij)(bij)の6
4×3個の値がメモリ(26)に保持されることになる。
これ以降、上述と同様の動作が繰り返され、次のフィー
ルドでは輝度評価値(yij)が、更に次のフィールドで
は色評価値(rij)と順次更新されることになる。
The integrator (23) receives the switching signal (S2), adds the A / D converted value of the output of the selection circuit (21) over one field period for each region, that is, digitally integrates for every 64 regions, When the integration for one field is completed, the integrated value is held in the memory (26) as a brightness evaluation value or a color evaluation value. As a result, the digital integration value of the luminance signal (Y) corresponding to 64 regions in a certain arbitrary field is 64.
The brightness evaluation values (yij) (i, j: 1 to 8) are obtained. In the next field, since the color difference signal (RY) is selected by the selection circuit (21), the color difference signal (R-Y) is obtained as a result of integration in each area of the integrator (23).
Y) digital integration value for each area is 64 color evaluation values (ri
obtained as j). In the next field, the color difference signal (BY) is selected by the selection circuit (21).
As a result of integration by the integrator (23), digital integration values for each area of the color difference signal (BY) are obtained as 64 color evaluation values (bij). Thus, the luminance signal (Y) and the color difference signal (R-
Y) (BY) when the integration of the three fields is completed, the brightness evaluation value (yij) and the color evaluation value (rij) (bij) are 6
4 × 3 values will be held in the memory (26).
After that, the same operation as described above is repeated, and the luminance evaluation value (yij) in the next field and the color evaluation value (rij) in the next field are sequentially updated.

上述の様にして得られる最新の評価値(yij)(rij)
(bij)は同一色処理回路(27)に入力される。この同
一色処理回路(27)は64個の領域の中の上下あるいは左
右方向に連続する複数の領域が同一色であるか否かを判
断し、この判断結果に基いて各領域の重み付けを決定す
るもので、その動作を第3図のフローチャートに示す。
Latest evaluation value (yij) (rij) obtained as described above
(Bij) is input to the same color processing circuit (27). The same color processing circuit (27) judges whether or not a plurality of areas which are continuous in the vertical and horizontal directions of the 64 areas have the same color, and based on the result of the judgment, the weighting of each area is determined. The operation is shown in the flowchart of FIG.

このフローチャートでは、STEP(100)(101)で領域
(A11)から判定を行うための初期設定が為され、STEP
(102)で重み付け量(wij)の初期設定が為され、先ず
全ての領域の重み付け量が1に設定される。STEP(10
4)では上下方向に連続して並んでいる領域での色差信
号(R−Y)の色評価値の差|rij−ri−1j|が所定値(C
1)を越えるか否かの判断を為し、同様にSTEP(105)
(106)では上下方向に連続する領域での色差信号(B
−Y)の色評価値の差|bij−bi−1j|及び輝度評価値の
差|yij−yi−1j|が夫々所定値(C2)、(C3)を越える
か否かの判断を為す。そして、いずれの評価値の差も所
定値(C1)(C2)(C3)を越えない時には、これらの上
下に連続する2領域の画面は同一色であると判断し、ST
EP(107)にて重み付け量(wij)が半減される。尚、所
定値(C1)(C2)(C3)は同一色と見做せる閾値であ
る。
In this flowchart, the initial settings for making the determination from the area (A11) in STEP (100) (101) are made.
The weighting amount (wij) is initialized in (102), and the weighting amounts of all areas are first set to 1. STEP (10
In 4), the difference | rij-ri-1j | of the color evaluation values of the color difference signals (RY) in the area that is continuously arranged in the vertical direction is the predetermined value (C
1) It is judged whether or not it exceeds, and similarly STEP (105)
In (106), the color difference signal (B
-Y) the difference between the color evaluation values | bij-bi-1j | and the difference between the brightness evaluation values | yij-yi-1j | exceed the predetermined values (C2) and (C3), respectively. Then, when the difference between the evaluation values does not exceed the predetermined values (C1) (C2) (C3), it is determined that the screens of the two consecutive areas above and below have the same color, and ST
The weight (wij) is halved in EP (107). The predetermined values (C1) (C2) (C3) are threshold values that can be regarded as the same color.

STEP(103)は、画面の最上段に並ぶ8個の領域につ
いては、これより上側に領域が存在しないので、STEP
(104)乃至(106)の判定を回避する働きを有してい
る。
As for STEP (103), there is no area above this for the 8 areas that are lined up on the top of the screen.
It has a function of avoiding the judgments of (104) to (106).

STEP(109)では、画面の左右方向に連続して並んで
いる領域での色差信号(R−Y)の色評価値の差|rij−
rij−1|が所定値(C1)を越えるか否かの判断を為し、
同様にSTEP(110)(111)で左右方向に連続する領域で
の色差信号(B−Y)の色評価値の差|bij−bij−1|及
び輝度評価値の差|yij−yij−1|が夫々所定値(C2)(C
3)を越えるか否かの判断を為す。そして、いずれの評
価値の差も所定値(C1)(C2)(C3)を越えない時に
は、これらの左右に連続する2領域の画面は同一色であ
ると判断し、STEP(112)にて重み付け量が半減され
る。尚、STEP(108)は画面の左端に並ぶ8個の領域に
ついてはこれより左側に領域に存在しないので、STEP
(109)乃至(111)の判定を回避する働きを有してい
る。以上の一連の同一色か否かの判定は、STEP(113)
により全領域について行なわれる。
In STEP (109), the difference between the color evaluation values of the color difference signals (RY) in the areas that are continuously arranged in the left-right direction of the screen | rij-
Judge whether rij−1 | exceeds a predetermined value (C1),
Similarly, in STEP (110) and (111), the color evaluation value difference | bij-bij−1 | and the brightness evaluation value difference | yij−yij−1 of the color difference signals (BY) in the region continuous in the left-right direction. Is a predetermined value (C2) (C
3) Make a judgment as to whether or not it exceeds. Then, when the difference between any of the evaluation values does not exceed the predetermined value (C1) (C2) (C3), it is determined that the screens of the two continuous areas on the left and right have the same color, and STEP (112) The weighting amount is halved. Note that STEP (108) does not exist on the left side of the eight areas lined up on the left edge of the screen, so STEP (108)
It has a function of avoiding the judgments of (109) to (111). To determine whether or not the same series of colors has been determined, see STEP (113).
Is performed for all areas.

こうして同一処理回路(27)にて決定された各領域の
重み付け量(wij)は、画面評価値回路(28)に入力さ
れ、次式(1)(2)に基づいて色差信号(R−Y)
(B−Y)の夫々の画面全体についての色評価値が画面
色評価値(Vr)(Vb)として算出される。
The weighting amount (wij) of each area thus determined by the same processing circuit (27) is input to the screen evaluation value circuit (28), and the color difference signal (RY) is input based on the following equations (1) and (2). )
The color evaluation value for each of the entire screens of (BY) is calculated as the screen color evaluation values (Vr) and (Vb).

ここで上式について簡単に説明する。 Here, the above formula will be briefly described.

式(1)において では各領域の色評価値(rij)に対応する重み付け量(w
ij)を乗算して重み付けした上で64個の領域分全ての総
和を求め、更に で求めた全領域の重み付け量の総和で割算して重み付け
量にて正規化することにより、面積的な要因を排除し
て、色差信号の色評価(rij)を重み付け量(wij)で画
面全体にわたって加重積算した画面色評価値(Vr)が導
出されることになる。尚、式(2)について同様であ
る。
In equation (1) Then, the weighting amount (w corresponding to the color evaluation value (rij) of each area
ij) and weighted to find the sum of all 64 regions, and By dividing by the sum of the weighting amounts of all areas obtained in step 3 and normalizing with the weighting amount, the area factor is eliminated and the color evaluation (rij) of the color difference signal is displayed with the weighting amount (wij). A screen color evaluation value (Vr) that is weighted and integrated over the entire area is derived. The same applies to the equation (2).

利得制御回路(29)(30)は、画面全体の色評価値で
画面色評価値(Vr)(Vb)が共に零となる様に、R及び
B増幅回路(4)(5)の夫々の利得を制御している。
こうして画面色評価(Vr)(Vb)が零になれば、白バラ
ンス調整が完了したことになる。以上の様に同一色の領
域の色情報の白バランス調整への寄与を他の領域の1/2
に減じることで、画面の大面積を同一色の被写体が占め
る場合にも、この同一色の被写体の画面全体の色評価値
に対する影響度が小さくなり、白バランスの前記被写体
の補色側へのズレが最小限に抑えられる。
The gain control circuits (29) and (30) are provided for the R and B amplifier circuits (4) and (5) so that the screen color evaluation values (Vr) and (Vb) of the entire screen are zero. It controls the gain.
Thus, when the screen color evaluation (Vr) (Vb) becomes zero, it means that the white balance adjustment is completed. As described above, the contribution of the color information of the same color area to the white balance adjustment is half that of other areas.
Even when a subject of the same color occupies a large area of the screen, the influence of the subject of the same color on the color evaluation value of the entire screen is reduced, and the white balance shifts to the complementary color side of the subject. Is minimized.

ところで、前述の実施例では軽減された重み付け量を
1/2と設定したが、1/3、1/4等適当な値に設定可能であ
ることは言うまでもない。また、同一色の領域の重み付
け量を両方共に減じる様に構成することも可能であるこ
とは言うまでもない。
By the way, in the above-described embodiment, the reduced weighting amount is
Although set to 1/2, it goes without saying that it can be set to an appropriate value such as 1/3 or 1/4. Further, it goes without saying that it is possible to reduce both the weighting amounts of the areas of the same color.

尚、本実施例では、A/D変換器(22)及び積分器(2
3)を、輝度信号(Y)、色差信号(R−Y)(B−
Y)の3信号のレベルを領域毎にディジタル積分して取
り出すために共用しており、各信号の積分値は3フィー
ルド周期での更新しかできなかったが、A/D変換器及び
積分器を夫々の信号用に専用に設ければ各信号レベルは
いずれも1フィールド毎にに更新可能となることは言う
までもない。
In this embodiment, the A / D converter (22) and the integrator (2
3) is a luminance signal (Y), a color difference signal (RY) (B-
It is shared in order to extract the level of 3 signals of Y) by digital integration for each area, and the integrated value of each signal could only be updated in 3 field cycles, but the A / D converter and the integrator were It goes without saying that each signal level can be updated for each field if it is provided exclusively for each signal.

また、第5図は、前記積分器(23)の内部構造を詳細
に示すもので、各A/D変換データは、切換回路(61)に
供給され、この切換回路(61)は切換信号(S2)を受け
て、各A/D変換値を領域毎に用意された加算器(F11)
(F12)…(F88)の中で該当データのサンプリング点が
存在する領域用の加算器に供給する役割を有する。即
ち、ある任意のデータのサンプリング点が領域(A11)
内に含まれているならば、このデータを領域(A11)用
の加算器(F11)に供給する。尚、以下、同様に加算器
(Fij)(i、j=1〜8)は領域(Aij)用に設定さ
れ、全部で64個の加算器が用意されている。各加算器の
後段には、保持回路(Qij)がそれぞれ配設され、各加
算値は各保持回路に一旦保持される。各保持回路の保持
データは、再び加算器に入力されて、次に入力されるデ
ータと加算される。また各保持回路は、垂直同期信号に
基ずいて1フィールド毎にリセットされ、このリセット
直前の保持データのみがメモリ(26)に供給される。従
って、1組の加算器及び保持回路にて1個のディジタル
積分回路が構成され、合計64個の積分回路が積分器(2
3)を構成することになり、1フィールド毎に各保持回
路から64個の領域毎にディジタル積分値がメモリ(26)
に入力されることになる。更に、A/D変換器(22)に入
力される両色差信号の基準レベル即ち零レベルは、完全
な無彩色面を撮影したときに得られるレベルに予め設定
されており、従って、各A/D変換値は正の値だけでな
く、負の値もとりうることは言うまでもない。
Further, FIG. 5 shows the internal structure of the integrator (23) in detail. Each A / D conversion data is supplied to the switching circuit (61), and the switching circuit (61) outputs the switching signal ( S2) to receive each A / D converted value and adder (F11) prepared for each area
In (F12) ... (F88), it has a role of supplying to the adder for the area where the sampling point of the corresponding data exists. That is, the sampling point of certain arbitrary data is the area (A11)
If it is included in the above, this data is supplied to the adder (F11) for the area (A11). In the following, similarly, the adder (Fij) (i, j = 1 to 8) is set for the area (Aij), and a total of 64 adders are prepared. A holding circuit (Qij) is arranged after each adder, and each added value is temporarily held in each holding circuit. The data held in each holding circuit is input to the adder again and added to the data input next. Further, each holding circuit is reset for each field based on the vertical synchronizing signal, and only the held data immediately before this reset is supplied to the memory (26). Therefore, one digital integrator circuit is composed of one set of adder and holding circuit, and a total of 64 integrator circuits are integrated (2
3) is configured, and the digital integrated value is memorized in each of 64 regions from each holding circuit for each field (26).
Will be entered in. Furthermore, the reference level, that is, the zero level, of both color difference signals input to the A / D converter (22) is preset to the level obtained when a perfect achromatic surface is photographed, and therefore It goes without saying that the D conversion value can be not only a positive value but also a negative value.

次に本発明の第2実施例について、第6図の回路ブロ
ック図を参考にして説明する。尚、第6図において第1
図と同一部分には同一符号を付して説明を省略する。
Next, a second embodiment of the present invention will be described with reference to the circuit block diagram of FIG. Incidentally, in FIG.
The same parts as those in the figure are designated by the same reference numerals and the description thereof will be omitted.

上述の如く、メモリ(26)に保持された最新の色評価
値(rij)(bij)(i,j=1〜8)は、画面評価回路(5
1)に送られ、次式(3)(4)に基づいて各色差信号
の画面全体の色評価値(Vr′)(Vb′)として算出され
る。
As described above, the latest color evaluation values (rij) (bij) (i, j = 1 to 8) held in the memory (26) are stored in the screen evaluation circuit (5
1) and calculated as color evaluation values (Vr ′) (Vb ′) of the entire screen of each color difference signal based on the following equations (3) and (4).

この式(3)(4)は64個の各領域の色評価値(ri
j)(bij)の全ての総和を全領域数で割算して、1個の
領域についての平均値を画面色評価値として算出する。
The expressions (3) and (4) are the color evaluation values (ri
j) All sums of (bij) are divided by the total number of areas, and an average value for one area is calculated as a screen color evaluation value.

利得制御回路(29)(30)は画面全体の色評価値であ
る画面色評価値(Vr′)(Vb′)が共に零となる様に利
得制御信号(Gr)(Gb)を出力する。
The gain control circuits (29) (30) output gain control signals (Gr) (Gb) so that the screen color evaluation values (Vr ') (Vb'), which are the color evaluation values of the entire screen, become zero.

一方、メモリに保持されている最新の評価値(yij)
(rij)(bij)(i,j:1〜8)は同一色処理回路(52)
に入力される。この同一処理回路(52)は64個の領域の
中の上下あるいは左右方向に連続する複数の領域が同一
色であるか否かを判断し、同一色と判断した回数をカウ
ントするもので、その動作を第11図のフローチャートに
示す。尚、第1実施例の第3図と同一STEPには同一符号
を付す。このフローチャートでは、STEP(200)でカウ
ンタ(CNT)の初期設定が為され、カウンタ(CNT)が零
に設定され、更にSTEP(100)(101)で領域(A11)か
ら判定を行なうための初期設定が為される。STEP(10
4)では上下方向に連続して並んでいる領域での色差信
号(R−Y)の色評価値の差|rij−ri−1j|が所定値(C
1)を越えるか否かの判定を為し、同様にSTEP(105)
(106)では上下方向に連続する領域での色差信号(B
−Y)の色評価値の差|bij−bi−1j|及び輝度評価値の
差|yij−yi−1j|が夫々所定値(C2)、(C3)を越える
か否かの判定を為す。そして、いずれの評価値の差も所
定値(C1)(C2)(C3)を越えない時には、これらの上
下に連続する2領域の画面は同一色であると判断し、ST
EP(207)にてカウンタ(CNT)に1が加えられる。尚、
所定値(C1)(C2)(C3)は同一色と見なせる閾値であ
る。STEP(103)は画面の最上段に並ぶ8個の領域につ
いては、これより上側に領域が存在しないので、STEP
(104)乃至(106)の判定を回避する働きを有してい
る。
On the other hand, the latest evaluation value (yij) stored in memory
(Rij) (bij) (i, j: 1 to 8) are the same color processing circuit (52)
Is input to The same processing circuit (52) judges whether or not a plurality of areas, which are continuous in the vertical or horizontal direction among 64 areas, have the same color, and counts the number of times of the same color. The operation is shown in the flowchart of FIG. The same steps as those in FIG. 3 of the first embodiment are designated by the same reference numerals. In this flowchart, the counter (CNT) is initialized in STEP (200), the counter (CNT) is set to zero, and the initial value for making a determination from the area (A11) in STEP (100) (101). Settings are made. STEP (10
In 4), the difference | rij-ri-1j | of the color evaluation values of the color difference signals (RY) in the area that is continuously arranged in the vertical direction is the predetermined value (C
It is judged whether it exceeds 1), and similarly, STEP (105)
In (106), the color difference signal (B
-Y) the difference between the color evaluation values | bij-bi-1j | and the difference between the brightness evaluation values | yij-yi-1j | exceed the predetermined values (C2) and (C3), respectively. Then, when the difference between the evaluation values does not exceed the predetermined values (C1) (C2) (C3), it is determined that the screens of the two consecutive areas above and below have the same color, and ST
The EP (207) adds 1 to the counter (CNT). still,
The predetermined values (C1) (C2) (C3) are thresholds that can be regarded as the same color. STEP (103) does not exist for the 8 areas lined up on the top of the screen.
It has a function of avoiding the judgments of (104) to (106).

STEP(109)では画面の左右方向に連続して並んでい
る領域での色差信号(R−Y)の色評価値の差|rij−ri
j−1|が所定値(C1)を越えるか否かの判定を為し、同
様にSTEP(110)(111)では左右方向に連続する領域で
の色差信号(B−Y)の色評価値の差|bij−bij−1|及
び輝度評価値の差|yij−yij−1|が夫々所定値(C2)、
(C3)を越えるか否かの判定を為す。そして、いずれの
評価値の差も所定値(C1)(C2)(C3)を越えない時に
は、これらの左右の連続する2領域の画面は同一色であ
ると判断し、STEP(212)にてカウンタ(CNT)に1が加
えられる。尚、STEP(108)は画面の左端に並ぶ8個の
領域については、これより左側に領域が存在しないの
で、STEP(109)乃至(111)の判定を回避する働きを有
している。以上の一連の同一色か否かの判定は、STEP
(113)により全領域について行なわれ、例えば全領域
が同一色の場合にはカウンタ(CNT)は最大112になる。
こうしてカウント値は同一色の領域の大きさを示すパラ
メータとなり、カウント値自体が同一色の領域の大きさ
に比例する。
In STEP (109), the difference between the color evaluation values of the color difference signal (RY) in the area that is lined up in the left-right direction of the screen | rij-ri
It is determined whether or not j−1 | exceeds a predetermined value (C1). Similarly, in STEP (110) (111), the color evaluation value of the color difference signal (BY) in the area continuous in the left-right direction. Difference | bij−bij−1 | and the luminance evaluation value difference | yij−yij−1 | are predetermined values (C2),
Determine whether or not (C3) is exceeded. Then, when the difference between any of the evaluation values does not exceed the predetermined value (C1) (C2) (C3), it is determined that the screens of these two continuous areas on the left and right have the same color, and at STEP (212) 1 is added to the counter (CNT). Note that the STEP (108) has a function of avoiding the determinations of STEP (109) to (111) because there is no area on the left side of the eight areas arranged at the left end of the screen. To determine whether or not the series of colors are the same, see STEP
(113) is performed for all areas. For example, when all areas have the same color, the counter (CNT) becomes 112 at maximum.
Thus, the count value becomes a parameter indicating the size of the same color area, and the count value itself is proportional to the size of the same color area.

上述の如き判断が全領域について終了すると、STEP
(214)でカウンタ(CNT)の値が判別される。STEP(11
4)では、0≦t1≦t2≦112なる2つの閾値(t1)(t2)
を用い、カウンタ(CNT)が(t1)未満の時にはSTEP(2
15)の如く判別信号(P1)が、カウンタ(CNT)が(t
1)以上で(t2)未満ならばSTEP(216)の如く判別信号
(P2)が、またカウンタ(CNT)が(t2)以上ならばSTE
P(217)の如く判別信号(P3)が、それぞれ同一色処理
回路(52)から出力される。尚、本実施例では、(t1)
(t2)の各閾値は、予め実験により実測値に基いてt1
50、t2=90に設定されている。この判別信号(P1)(P
2)(P3)と前述の利得制御回路(29)(30)からの利
得制御信号(Gr)(Gb)はいずれも利得調整回路(31)
に入力される。利得調整回路(31)は第7図の様にそれ
ぞれ2つのスイッチ(40)(41)、割算器(42)(44)
及び前値ホールド回路(43)(45)より構成される。
When the above judgment is completed for all areas, STEP
The value of the counter (CNT) is determined in (214). STEP (11
In 4), two thresholds (t1) and (t2) such that 0 ≦ t 1 ≦ t 2 ≦ 112
When the counter (CNT) is less than (t1), use STEP (2
As shown in 15), the discrimination signal (P1) is output by the counter (CNT) (t
If 1) or more and less than (t2), the discrimination signal (P2) as in STEP (216), and if the counter (CNT) is (t2) or more, STE
The discrimination signal (P3) as in P (217) is output from the same color processing circuit (52). In this example, (t1)
Each threshold value of (t2) is t 1 =
50 and t 2 = 90 are set. This discrimination signal (P1) (P
2) Both the gain control signals (Gr) and (Gb) from (P3) and the gain control circuits (29) and (30) described above are gain control circuits (31).
Is input to The gain adjustment circuit (31) has two switches (40) (41) and dividers (42) (44) as shown in FIG.
And a previous value hold circuit (43) (45).

割り算器(42)(44)は、入力される利得制御信号
(Gr)(Gb)のレベルを1/2に減衰させる働きを為し、
前置ホールド回路(43)(45)は後段のスイッチ回路
(40)(41)からの1フィールド前の出力を(Gr′)
(Gb′)として保持する働きを為す。
The dividers (42) (44) serve to attenuate the level of the input gain control signals (Gr) (Gb) to 1/2,
The front hold circuits (43) (45) output the output one field before from the switch circuits (40) (41) in the subsequent stage (Gr ').
Holds as (Gb ').

スイッチ(40)(41)は夫々、利得制御信号(Gr)
(Gb)が送出される固定接点(40a)(41a)、割算器
(42)(44)出力が送出される固定接点(40b)(41
b)、前置ホールド回路(43)(45)出力が送出される
固定接点(40c)(41c)のいずれを一つを選択する機能
を有する。また、両スイッチ(40)(41)の切換は、同
一色処理回路(52)から得られる判別信号(P1)(P2)
(P3)により制御され、判別信号(P1)が出力されてい
る時には夫々固定接点(40a)(41a)側にあって利得制
御信号(Gr)(Gb)がそのまま出力端子(46)(47)に
出力され、判別信号(P2)が出力されている時には夫々
固定接点(40b)(41b)側に切換わり、2分の1に減衰
された利得制御信号が出力端子(46)(47)に出力さ
れ、また判別信号(P3)が出力されている時には夫々固
定接点(40c)(41c)側に切換わり、前値ホールド回路
(43)(45)に格納されている前回の利得制御信号(G
r′)(Gb′)が出力端子(46)(47)に出力される。
The switches (40) and (41) are gain control signals (Gr), respectively.
Fixed contacts (40a) (41a) to which (Gb) is sent, fixed contacts (40b) (41) to which the outputs of the dividers (42) (44) are sent
b) It has a function of selecting one of the fixed contacts (40c) (41c) to which the outputs of the pre-hold circuits (43) (45) are sent. Further, the switching of both switches (40) (41) is performed by the discrimination signals (P1) (P2) obtained from the same color processing circuit (52).
When the discrimination signal (P1) is output under the control of (P3), the gain control signals (Gr) and (Gb) are output to the output terminals (46) and (47) as they are on the fixed contacts (40a) (41a) side, respectively. To the fixed contact (40b) (41b) side when the discrimination signal (P2) is output to the output terminal (46) (47). When it is output and the discrimination signal (P3) is output, it switches to the fixed contact (40c) (41c) side, respectively, and the previous gain control signal () stored in the previous value hold circuits (43) (45) G
r ') (Gb') is output to the output terminals (46) (47).

また、出力端子に導出された各利得制御信号は前値ホ
ールド回路(43)(45)に改めて入力され保持される。
Further, each gain control signal derived to the output terminal is input again to the previous value hold circuits (43) and (45) and held therein.

ここで同一色処理回路(52)と利得調整回路(31)の
動作の意味について、第8図、第9図及び第10図を用い
て説明する。
Here, the meaning of the operation of the same color processing circuit (52) and the gain adjusting circuit (31) will be described with reference to FIG. 8, FIG. 9 and FIG.

いま第8図に示す様に様々な被写体が混在する画面を
撮影したとすると、同一色処理回路(52)で同一色と判
断される領域は、図に斜線を施した青空の部分である。
この時同一色処理回路(52)のカウンタ(CNT)の値は1
7でt1未満となり、判別信号(P1)が出力され、利得調
整回路(31)はこれを受けてスイッチ(40)(41)を固
定接点(40a)(41a)に切り換え、利得制御信号(Gr)
(Gb)が導出され、R及びB増幅回路(4)(5)はこ
の利得制御信号によってR及びB信号の利得制御、即ち
通常の白バランス処理を行なう。
Assuming that a screen in which various subjects are mixed is photographed as shown in FIG. 8, the area determined to be the same color by the same color processing circuit (52) is the shaded blue sky in the figure.
At this time, the value of the counter (CNT) of the same color processing circuit (52) is 1
At 7, the value becomes less than t 1 and the discrimination signal (P1) is output, and the gain adjustment circuit (31) receives it and switches the switches (40) (41) to fixed contacts (40a) (41a), and the gain control signal ( Gr)
(Gb) is derived, and the R and B amplifier circuits (4) and (5) perform gain control of the R and B signals by this gain control signal, that is, normal white balance processing.

次にビデオカメラを上方向にチルティングしたため
に、第9図の様な画面に変わったとする。この時、同一
色処理回路(52)で同一色と判断される青空の領域は、
図の斜線部の様に大きくなり、カウンタ(CNT)の値は6
2でt1以上、t2未満となって、判別信号(P2)が出力さ
れ、利得調整回路(31)はこれを受けてスイッチ(40)
(41)を固定接点(40b)(41b)に切り変え、利得制御
信号(Gr)(Gb)の2分の1の制御信号によって白バラ
ンス処理を行う。その結果、R及びB増幅回路(4)
(5)の利得の変化速度は通常(第8図の場合)の2分
の1となる。
Next, it is assumed that the screen is changed as shown in FIG. 9 because the video camera is tilted upward. At this time, the area of the blue sky which is judged to be the same color by the same color processing circuit (52) is
It becomes large like the shaded area in the figure, and the value of the counter (CNT) is 6
When t 2 is greater than or equal to t 1 and less than t 2 , the discrimination signal (P2) is output, and the gain adjustment circuit (31) receives this signal and the switch (40).
(41) is switched to the fixed contacts (40b) and (41b), and white balance processing is performed by a control signal that is half the gain control signals (Gr) and (Gb). As a result, R and B amplifier circuits (4)
The rate of change of the gain in (5) is one half of the normal rate (in the case of FIG. 8).

更に上方向へのチルティングを続けると、画面は第10
図の様に変化する。この時、同一色処理回路(52)で同
一色と判断される青空の領域は、図の斜線部の様に更に
大きくなり、カウンタ(CNT)の値は92でt2以上、にな
って、判別信号(P3)が出力され、利得調整回路(31)
はこれを受けてスイッイ(40)(41)を固定接点(40
c)(41c)に切り変え、前記ホールド回路(43)(45)
に保持されている前回の利得制御信号(Gr′)(Gb′)
によって白バランス処理を行う。これにより、現在の撮
像画面を白バランス調整の評価画面として採用せず、前
フィールドの画面に基いてR及びB信号の利得制御が為
されることになる。
If you continue tilting upward, the screen will
Change as shown. At this time, the blue sky area judged to be the same color by the same color processing circuit (52) becomes larger as shown by the shaded area in the figure, and the value of the counter (CNT) is 92 and becomes t 2 or more. Discrimination signal (P3) is output and gain adjustment circuit (31)
In response to this, the switch (40) (41) is fixed contact (40
c) Switch to (41c) and hold circuit (43) (45)
Previous gain control signal (Gr ') (Gb') held in
Perform white balance processing by. As a result, the current imaging screen is not adopted as the evaluation screen for white balance adjustment, and the gain control of the R and B signals is performed based on the screen of the previous field.

つまり、撮像画面中で同一色の被写体が占める面積の
大きさによって、利得制御速度を段階的に変化させ、ま
た画面の大部分が同一色の被写体によって占められた場
合には、その画面の色情報での白バランス調整は行なわ
れないことになる。これにより白バランスの前記被写体
の補色側へのズレが最小限に抑えられる。
That is, the gain control speed is changed stepwise depending on the size of the area occupied by the same color subject in the imaging screen, and when the majority of the screen is occupied by the same color subject, The white balance adjustment will not be performed on the information. As a result, the shift of the white balance to the complementary color side of the subject can be minimized.

ところで、前述の実施例では同一色領域数の判別を
(t1)未満、(t1)以上(t2)未満、(t2)以上の3段
階としたが、閾値を更に多く設定し、より多くの判別段
階を設ける事により、利得制御速度を更に多段階に変化
させることが可能であることはいうまでもない。
By the way, in the above-described embodiment, the discrimination of the number of the same color areas is performed in three stages of less than (t1), (t1) or more and less than (t2), and (t2) or more. It goes without saying that the gain control speed can be changed in more steps by providing the steps.

更に、同一色処理回路(27)(52)の動作は、マイク
ロプロセッサにより、ソフトウェア的に処理可能である
事は言うまでもない。
Further, it goes without saying that the operations of the same color processing circuits (27, 52) can be processed by software by a microprocessor.

(ト)発明の効果 上述の如く本発明によれば、画面に同一色で大面積の
被写体が存在する場合でも、白バランスの被写体の補色
側へのずれが最小限に抑えられる。
(G) Effect of the Invention As described above, according to the present invention, even when a subject having the same color and a large area exists on the screen, the shift of the white balance subject to the complementary color side can be minimized.

【図面の簡単な説明】[Brief description of drawings]

第1図乃至第3図及び第5図は本発明の第1実施例に係
り、第1図は全体の回路ブロック図、第2図は画面分割
の説明図、第3図はフローチャート、第5図は要部回路
ブロック図であり、第4図は従来例の回路ブロック図で
ある。 また、第6図乃至第11図は本発明の第2実施例に係り、
第6図は全体の回路ブロック図、第7図は要部回路ブロ
ック図、第8図、第9図、第10図は撮像画面を示す図、
第11図はフローチャートである。 (23)……積分器、(27)、(52)……同一色処理回
路、(28)……画面評価回路、(29)、(30)……利得
制御回路、(31)……利得調整回路
1 to 3 and 5 relate to the first embodiment of the present invention. FIG. 1 is an overall circuit block diagram, FIG. 2 is an explanatory diagram of screen division, FIG. 3 is a flowchart, and FIG. FIG. 4 is a circuit block diagram of a main part, and FIG. 4 is a circuit block diagram of a conventional example. 6 to 11 relate to the second embodiment of the present invention,
FIG. 6 is an overall circuit block diagram, FIG. 7 is a main circuit block diagram, FIGS. 8, 9, and 10 are diagrams showing an image pickup screen,
FIG. 11 is a flowchart. (23) ... integrator, (27), (52) ... same color processing circuit, (28) ... screen evaluation circuit, (29), (30) ... gain control circuit, (31) ... gain Adjustment circuit

Claims (9)

【特許請求の範囲】[Claims] 【請求項1】撮像映像信号中の色情報信号を基に白バラ
ンス調整を行う白バランス調整装置において、 撮像画面内で色情報信号レベルの変動量が所定量を下回
わる領域での色情報信号の白バランス調整への寄与を他
の領域より軽減させることを特徴とする白バランス調整
装置。
1. A white balance adjusting device for performing white balance adjustment based on a color information signal in a picked-up image signal, wherein color information in an area in which a variation amount of a color information signal level is below a predetermined amount in an image pickup screen. A white balance adjusting device, characterized in that the contribution of a signal to white balance adjustment is reduced compared to other areas.
【請求項2】撮像画面を分解して設定された複数の領域
毎の色情報信号レベルを各色の色評価値として得る色評
価値検出手段と、 前記各領域の色評価値に各領域毎の重み付け量にて重み
付けを行い、この重み付け後の色評価値より画面全体に
ついて色評価値を画面色評価値として算出する画面色評
価値算出手段と、 該画面色評価値を基に各色情報信号の増幅利得を制御す
る利得制御手段を備え、 色評価値の変動量が所定量を下回る領域が前記撮像画面
の水平または垂直方向に連続して存在する場合には、前
記下回る領域での重み付け量を他の領域に比べて小さく
することを特徴とする白バランス調整装置。
2. A color evaluation value detecting means for obtaining a color information signal level for each of a plurality of areas set by disassembling an image pickup screen as a color evaluation value of each color, and a color evaluation value of each area for each area. A screen color evaluation value calculating means for performing weighting with a weighting amount and calculating a color evaluation value for the entire screen as a screen color evaluation value from the weighted color evaluation value, and a color information signal of each color information signal based on the screen color evaluation value. If a region in which the variation amount of the color evaluation value falls below a predetermined amount continuously exists in the horizontal or vertical direction of the image pickup screen, a weight control unit for controlling the amplification gain is provided. A white balance adjusting device characterized by being made smaller than other areas.
【請求項3】撮像画面を分割して設定された複数の領域
毎の色差信号レベルを各色の色評価値として得る色評価
値検出手段と、 前記各領域の色評価値に各領域毎の重み付け量にて重み
付けを行い、この重み付け後の色評価値より画面全体に
ついての色評価値を画面色評価値として算出する画面色
評価値算出手段と、 該画面色評価値を基に各色信号の増幅利得を制御する利
得制御手段を備え、 色評価値の変動量が所定量を下回る領域が前記撮像画面
の水平または垂直方向に連続して存在する場合には、前
記下回る領域での重み付け量を他の領域に比べて小さく
することを特徴とする白バランス調整装置。
3. A color evaluation value detecting means for obtaining a color difference signal level for each of a plurality of areas set by dividing an imaging screen as a color evaluation value of each color, and weighting the color evaluation value of each area for each area. A screen color evaluation value calculating means for performing weighting by the amount and calculating a color evaluation value for the entire screen as a screen color evaluation value from the weighted color evaluation value, and amplification of each color signal based on the screen color evaluation value. If a region in which the variation amount of the color evaluation value is less than a predetermined amount is continuously present in the horizontal or vertical direction of the imaging screen, a gain control unit for controlling the gain is provided, and the weighting amount in the lower region is changed to another. The white balance adjusting device is characterized in that it is smaller than the area.
【請求項4】撮像映像信号中の色情報信号を基に白バラ
ンス調整を行う白バランス調整装置において、 撮像画面内の水平方向もしくは垂直方向に連続し且つ色
情報信号レベルの変動量が所定量を下回る領域の大きさ
を算出する手段を有し、 該算出結果に基づいて白バランス調整の調整速度を多段
階に変化させることを特徴とする白バランス調整装置。
4. A white balance adjusting device for performing white balance adjustment based on a color information signal in a picked-up video signal, wherein a fluctuation amount of a color information signal level is continuous in a horizontal direction or a vertical direction in a picked-up screen. A white balance adjusting device comprising means for calculating the size of a region below the range, and changing the adjustment speed of the white balance adjustment in multiple stages based on the calculation result.
【請求項5】撮像映像信号中の色情報信号を基に白バラ
ンス調整を行う白バランス調整装置において 撮像画面内の水平方向もしくは垂直方向に連続し、且つ
色情報信号レベルの変動量が所定量を下回る領域の大き
さを算出する手段を有し、 該算出結果に基づいて現在の色情報信号での白バランス
調整を中止することを特徴とする白バランス調整装置。
5. A white balance adjusting device for performing white balance adjustment on the basis of a color information signal in a picked-up video signal, wherein the white information is continuous in a horizontal direction or a vertical direction in an image pickup screen, and a variation amount of a color information signal level is a predetermined amount. A white balance adjusting apparatus comprising means for calculating the size of a region below the range, and stopping the white balance adjustment for the current color information signal based on the calculation result.
【請求項6】撮像画面を分割して設定された複数の領域
毎の色情報信号レベルを各色の色評価値として得る色評
価値検出手段と、 前記各領域の色評価値を基に各色情報信号の増幅利得を
調整する利得調整手段と、 色評価値の変動量が所定値を下回る領域が前記撮像画面
の水平または垂直方向に連続して存在する場合には、前
記下回る領域の個数を算出する手段を備え、 該算出結果に基づいて前記増幅利得の調整速度を多段階
に変化させることを特徴とする白バランス調整装置。
6. A color evaluation value detecting means for obtaining a color information signal level for each of a plurality of areas set by dividing an image pickup screen as a color evaluation value of each color, and each color information based on the color evaluation value of each area. A gain adjusting means for adjusting the amplification gain of the signal, and when there are regions where the variation amount of the color evaluation value falls below a predetermined value continuously in the horizontal or vertical direction of the image pickup screen, the number of the regions falling below is calculated. A white balance adjusting apparatus comprising: means for changing the adjustment speed of the amplification gain in multiple stages based on the calculation result.
【請求項7】撮像画面を分解して設定された複数の領域
毎の色差信号レベルを各色の色評価値として得る色評価
値検出手段と、 前記各領域の色評価値を基に各色信号の増幅利得を調整
する利得調整手段と、 色評価値の変動量が所定値を下回る領域が前記撮像画面
の水平または垂直方向に連続して存在する場合には、前
記下回る領域の個数を算出する手段を備え、 該算出結果に基づいて前記増幅利得の調整速度を多段階
に変化させることを特徴とする白バランス調整装置。
7. A color evaluation value detecting means for obtaining a color difference signal level for each of a plurality of areas set by disassembling an image pickup screen as a color evaluation value of each color, and a color evaluation value of each color signal based on the color evaluation value of each area. A gain adjusting means for adjusting the amplification gain, and a means for calculating the number of the areas where the variation amount of the color evaluation value is below a predetermined value continuously when the area is continuously present in the horizontal or vertical direction of the imaging screen. A white balance adjusting apparatus, comprising: a changing speed of the amplification gain in multiple stages based on the calculation result.
【請求項8】撮像画面を分割して設定された複数の領域
毎の色情報信号レベルを各色の色評価値として得る色評
価値検出手段と、 前記各領域の色評価値を基に各色情報信号の増幅利得を
調整する利得調整手段と、 色評価値の変動量が所定値を下回る領域が前記撮像画面
の水平または垂直方向に連続して存在する場合には、前
記下回る領域の個数を算出する手段を備え、 該算出結果に基づいて現在の色情報信号での前記利得調
整を中止することを特徴とする白バランス調整装置。
8. A color evaluation value detecting means for obtaining a color information signal level for each of a plurality of areas set by dividing an image pickup screen as a color evaluation value of each color, and each color information based on the color evaluation value of each area. A gain adjusting means for adjusting the amplification gain of the signal, and when there are regions where the variation amount of the color evaluation value falls below a predetermined value continuously in the horizontal or vertical direction of the image pickup screen, the number of the regions falling below is calculated. A white balance adjusting apparatus comprising: means for stopping the gain adjustment for the current color information signal based on the calculation result.
【請求項9】撮像画面を分割して設定された複数の領域
毎の色差信号レベルの各色の色評価値として得る色評価
値検出手段と、 前記各領域の色評価値を基に各色信号の増幅利得を調整
する利得調整手段と、 色評価値の変動量が所定値を下回る領域が前記撮像画面
の水平または垂直方向に連続して存在する場合には、前
記下回る領域の個数を算出する手段と備え、 該算出結果に基づいて現在の色差信号での前記利得調整
を中止することとを特徴とする白バランス調整装置。
9. A color evaluation value detecting means for obtaining as a color evaluation value of each color of a color difference signal level for each of a plurality of areas set by dividing an image pickup screen, and a color evaluation value of each color signal based on the color evaluation value of each area. A gain adjusting means for adjusting the amplification gain, and a means for calculating the number of the areas where the variation amount of the color evaluation value is below a predetermined value continuously when the area is continuously present in the horizontal or vertical direction of the imaging screen. A white balance adjusting apparatus, characterized in that the gain adjustment for the current color difference signal is stopped based on the calculation result.
JP2080102A 1989-11-17 1990-03-28 White balance adjuster Expired - Fee Related JPH0828878B2 (en)

Priority Applications (13)

Application Number Priority Date Filing Date Title
JP2080102A JPH0828878B2 (en) 1989-11-17 1990-03-28 White balance adjuster
US07/612,831 US5442408A (en) 1989-11-17 1990-11-13 White balance adjusting apparatus for automatically adjusting white balance in response to luminance information signal and color information signal obtained from image sensing device
EP95119589A EP0708569B1 (en) 1989-11-17 1990-11-16 A white balance adjusting apparatus for automatically adjusting white balance in response to color information signal obtained from image sensing device
DE69033744T DE69033744T2 (en) 1989-11-17 1990-11-16 White balance adjustment device for automatic adjustment of the white balance in dependence on the color information signal from an image recording device
EP95119590A EP0711082B1 (en) 1989-11-17 1990-11-16 A white balance adjusting apparatus for automatically adjusting white balance in response to color information signal obtained from image sensing device
DE69027751T DE69027751T2 (en) 1989-11-17 1990-11-16 White balance adjustment device for automatic adjustment of the white balance depending on the luminance information signal and color information signal from an image recording device
ES90121976T ES2091784T3 (en) 1989-11-17 1990-11-16 WHITE BALANCE REGULATION CIRCUIT TO AUTOMATICALLY ADJUST THE WHITE BALANCE IN RESPONSE TO LIGHTING INFORMATION SIGNS AND COLOR INFORMATION SIGNALS FROM AN IMAGE CAPTURER.
CA002030142A CA2030142C (en) 1989-11-17 1990-11-16 White balance adjusting apparatus for automatically adjusting white balance in response to color information signal obtained from image sensing device
DE69033743T DE69033743T2 (en) 1989-11-17 1990-11-16 White balance adjustment device for automatically adjusting the white balance depending on the color information signal from an image pickup device
EP90121976A EP0433672B1 (en) 1989-11-17 1990-11-16 White balance adjusting apparatus for automatically adjusting white balance in response to colour information signal obtained from image sensing device
KR1019900018624A KR100196305B1 (en) 1989-11-17 1990-11-16 Automatic white balance adjusting apparatus for white balance adjusting on the basis of color information abtained from ccd
US08/360,987 US5489939A (en) 1989-11-17 1994-12-20 White balance adjusting apparatus for automatically adjusting white balance in response to a color information signal obtained from an image sensing device
US08/454,835 US5555022A (en) 1989-11-17 1995-05-31 White balance adjusting apparatus for automatically adjusting white balance in response to color information signal obtained from image sensing device

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP30023989 1989-11-17
JP1-300239 1989-11-17
JP2080102A JPH0828878B2 (en) 1989-11-17 1990-03-28 White balance adjuster

Publications (2)

Publication Number Publication Date
JPH03219790A JPH03219790A (en) 1991-09-27
JPH0828878B2 true JPH0828878B2 (en) 1996-03-21

Family

ID=26421150

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2080102A Expired - Fee Related JPH0828878B2 (en) 1989-11-17 1990-03-28 White balance adjuster

Country Status (1)

Country Link
JP (1) JPH0828878B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010268338A (en) * 2009-05-18 2010-11-25 Panasonic Corp Imaging device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3010373B2 (en) * 1990-10-30 2000-02-21 キヤノン株式会社 Imaging device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010268338A (en) * 2009-05-18 2010-11-25 Panasonic Corp Imaging device

Also Published As

Publication number Publication date
JPH03219790A (en) 1991-09-27

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