JPH02131679A - Electronic zoom device and image pickup device incorporating electronic zoom - Google Patents
Electronic zoom device and image pickup device incorporating electronic zoomInfo
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- JPH02131679A JPH02131679A JP63286165A JP28616588A JPH02131679A JP H02131679 A JPH02131679 A JP H02131679A JP 63286165 A JP63286165 A JP 63286165A JP 28616588 A JP28616588 A JP 28616588A JP H02131679 A JPH02131679 A JP H02131679A
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- zoom
- electronic zoom
- circuit
- magnification
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- 230000003287 optical effect Effects 0.000 claims description 20
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 230000006866 deterioration Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 13
- 230000000694 effects Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 230000001934 delay Effects 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
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Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は電子的にＴ”／信号などの映像信号を拡大縮少
する電子ズーム装置及び電子ズーム内蔵撮像装置に関す
るものでちる。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electronic zoom device for electronically enlarging/reducing a video signal such as a T''/signal, and an imaging device with a built-in electronic zoom.
従来の技術
従来の電子ズーム装置としては第９図のブロック図に示
すものがあり、これは撮像装置とズーム装置を接続した
ものである。同図において左上側の破線内は撮像装置７
０１であシ、その中の１は光電変換を行なう撮像素子、
２は撮像素子の信号にｒ補正を行ない輝度信号ｙと２つ
の色差信号▼と▼に変換するγ回路及びマトリック回路
、３はＭＴＦを補正するアパーチャ補正回路である。ま
た同図の右側の破線内は電子ズーム装置７０２であり、
その中の４，５は水平及び垂直方向２次元で補間を行な
い拡大、縮少の演算を行なう補間回路、６は補間回路４
，５がどの画素信号を用いて補間を行なうかの制御を行
なうズーム制御回路である。2. Description of the Related Art A conventional electronic zoom device is shown in the block diagram of FIG. 9, which connects an image pickup device and a zoom device. In the same figure, the area within the broken line on the upper left side is the imaging device 7.
01, one of which is an image sensor that performs photoelectric conversion,
Reference numeral 2 designates a γ circuit and a matrix circuit that performs r correction on the signal from the image sensor and converts it into a luminance signal y and two color difference signals ▼ and ▼, and 3 represents an aperture correction circuit that corrects the MTF. Also, inside the broken line on the right side of the figure is an electronic zoom device 702,
Of these, 4 and 5 are interpolation circuits that perform two-dimensional interpolation in the horizontal and vertical directions to perform expansion and reduction operations, and 6 is an interpolation circuit 4.
, 5 is a zoom control circuit that controls which pixel signal is used for interpolation.
以上の様に構成された従来のズーム装置においてはズー
ム制御入力によりズーム制御回路６が補間する演算点を
決定し、画素間隔との関係によシ補間の重みを決定する
。決定された重みは補間回路４，６によシそれぞれの信
号に垂算され、加算されて補間値が演算され、拡大、縮
少された映像信号が出力される。In the conventional zoom device configured as described above, the zoom control circuit 6 determines the calculation point to be interpolated based on the zoom control input, and determines the weight of the interpolation based on the relationship with the pixel interval. The determined weights are multiplied by the respective signals by the interpolation circuits 4 and 6 and added to calculate interpolated values, and an enlarged or reduced video signal is output.
発明が解決しようとする課題
しかしながら上記のような構成ではズーム倍率が高くな
ったとき、入力された映像信号のノイズの高周波成分が
低い周波数成分に変換され、見た目の映像信号のＳｌＮ
比が低下する。特に入力された信号がアパーチャ補正回
路などにより、高周波成分をブーストした信号の場合、
ノイズの高周波成分も同時にプーストされており、ズー
ム倍率を上げると見た目のＳ／Ｎ劣化が激しくなるとい
う問題点を有していた。Problems to be Solved by the Invention However, in the above configuration, when the zoom magnification becomes high, the high frequency components of noise in the input video signal are converted to low frequency components, and the apparent SLN of the video signal increases.
ratio decreases. Especially if the input signal is a signal whose high frequency components have been boosted by an aperture correction circuit, etc.
The high-frequency components of the noise are also boosted at the same time, and there is a problem in that as the zoom magnification is increased, the apparent S/N deterioration becomes more severe.
本発明はかかる点に鑑み、ズーム倍率を上げた場合にお
いても見た目のＳ／Ｎが劣化しないような電子ズーム装
置及び電子ズーム内蔵撮像装置を提供することを目的と
する。SUMMARY OF THE INVENTION In view of this, an object of the present invention is to provide an electronic zoom device and an image pickup device with a built-in electronic zoom, in which the apparent S/N ratio does not deteriorate even when the zoom magnification is increased.
課題を解決するだめの手段
上記課題を解決するため本発明の電子ズーム装置は、入
力された信号の高周波成分を補うアパーチャ補正回路と
、アパーチャ補正された信号を補間する補間回路と、ズ
ーム倍率に対応して前記アバーチャ補正回路及び前記補
間回路の特性を制御するズーム制御回路を備えたことを
特徴とする。Means for Solving the Problems In order to solve the above problems, the electronic zoom device of the present invention includes an aperture correction circuit that compensates for high frequency components of an input signal, an interpolation circuit that interpolates the aperture-corrected signal, and a zoom magnification. The present invention is characterized by comprising a zoom control circuit that correspondingly controls characteristics of the aperture correction circuit and the interpolation circuit.
また本発明の電子ズーム内蔵撮像装置は、光電変換を行
なう撮像素子に、上記の電子ズーム装置を連結させたこ
とを特徴とする。Further, an imaging device with a built-in electronic zoom according to the present invention is characterized in that the electronic zoom device described above is connected to an imaging element that performs photoelectric conversion.
さらに本発明の電子ズーム内蔵撮像装置は、光電変換を
行なう撮像素子と、この光電変換の対象となる光学像の
大きさを変化させることのできるズームレンズと、前記
ズームレンズのズーム倍率を変化させるレンズ制御回路
と、前記撮像素子からの信号を電子的にズームする電子
ズーム装置と、前記電子ズーム装置のズーム倍率を変化
させるズーム制御回路と、カメラズーム制御回路とを備
え、このカメラズーム制御回路は、レンズ光学系のズー
ム倍率が一定の基準より大きくなったときにズーム制御
回路を制御して電子ズームのズーム倍率を上げ、また電
子ズームのズーム倍率が一定の基準より小さくなったと
きにレンズ制御回路を制御してレンズ光学系のズーム倍
率を下げることを特徴とする。Further, the electronic zoom built-in imaging device of the present invention includes an image sensor that performs photoelectric conversion, a zoom lens that can change the size of an optical image that is a target of the photoelectric conversion, and a zoom lens that changes the zoom magnification of the zoom lens. The camera zoom control circuit includes a lens control circuit, an electronic zoom device that electronically zooms a signal from the image sensor, a zoom control circuit that changes the zoom magnification of the electronic zoom device, and a camera zoom control circuit. controls the zoom control circuit to increase the zoom magnification of the electronic zoom when the zoom magnification of the lens optical system becomes larger than a certain standard, and increases the zoom magnification of the electronic zoom when the zoom magnification of the electronic zoom becomes smaller than a certain standard. It is characterized by lowering the zoom magnification of the lens optical system by controlling the control circuit.
作用
本発明は前記した電子ズーム装置の構成により、ズーム
倍率を高くした場合、アパーチャ補正回路を制御し、例
えばそのコアリング量やプースト周波数又はブースト量
を調節して見た目のＳ／Ｎの劣化を少なくする。Effect The present invention uses the configuration of the electronic zoom device described above, and when the zoom magnification is increased, the aperture correction circuit is controlled and, for example, the coring amount, boost frequency, or boost amount is adjusted to prevent apparent S/N deterioration. Reduce.
また本発明の電子ズーム内蔵撮像装置によれば、カメラ
ズーム制御回路によりレンズ光学系のズーム倍率と電子
ズームのズーム倍率を制御することによって、撮像装置
全体としては両者のズーム倍率が乗算されることになシ
、より小さな光学系ズーム倍率で撮像装置としては大き
な倍率が実現するため、光学系の小形軽量化を図ること
ができる。Further, according to the imaging device with a built-in electronic zoom of the present invention, by controlling the zoom magnification of the lens optical system and the zoom magnification of the electronic zoom by the camera zoom control circuit, the zoom magnification of both can be multiplied for the entire imaging device. However, since a large magnification can be achieved as an imaging device with a smaller optical system zoom magnification, the optical system can be made smaller and lighter.
実施例
第１図は本発明の第１の実施例における電子ズーム装置
を撮像装置に組込んだ電子ズーム内蔵撮像装置のプロソ
ク図を示すものである。第１図において外側の破線の内
部である１０２は電子ズーム装置を示し、内側の破線の
内部である。１０１は信号の高周波成分を補償するアパ
ーチャ補正回路である。このアパーチャ補正回路１ｏ１
は、撮像素子１とγ回路及びマトリックス回路２からな
る撮像部と電子ズーム部とで共用している。４，６は近
傍の画像信号から必要な位置の信号を補閲する補間回路
、１１は信号を遅延する遅延回路、１２は信号の高周波
成分を通過させるＨＰＦ、１３は信号のレベルを変化さ
せるゲイン設定回路、１４は微小信号を低減させるコア
リング回路、１５は加算回路であり、１６はコアリング
回路１４、補間回路４，５を制御するズーム制御回路で
ある。Embodiment FIG. 1 is a schematic diagram of an image pickup device with a built-in electronic zoom in which an electronic zoom device according to a first embodiment of the present invention is incorporated into the image pickup device. In FIG. 1, 102, which is inside the outer broken line, indicates an electronic zoom device, which is inside the inner broken line. 101 is an aperture correction circuit that compensates for high frequency components of the signal. This aperture correction circuit 1o1
is shared by the imaging section consisting of the imaging device 1, the γ circuit, and the matrix circuit 2, and the electronic zoom section. 4 and 6 are interpolation circuits that correct signals at necessary positions from nearby image signals; 11 is a delay circuit that delays signals; 12 is an HPF that passes high frequency components of the signals; and 13 is a gain that changes the signal level. 14 is a coring circuit for reducing minute signals; 15 is an adder circuit; and 16 is a zoom control circuit for controlling the coring circuit 14 and interpolation circuits 4 and 5.
以上のように構成された本実施例の電子ズーム内蔵撮像
装置について以下その動作を説明する。The operation of the electronic zoom built-in imaging device of this embodiment configured as described above will be described below.
撮像素子１及びγ、マトリックス回路２よシ輝度信号ｙ
と２つの色差信号Ｕ▼が得られる。ＨＰＦ１２でアパー
チャ補正する帯域の周波数成分を分離し、ゲイン設定回
路１３で高周波成分の補償量を設定し、目的の周波数特
性を実現させる。コアリング回路１４では高周波のノイ
ズ成分を第２図にその入出力特性を示す非線形回路によ
り低減する。ズーム制御回路１６は非線形部分２０の大
きさ（以下「コアリングレベル」と称す）を制御するこ
とにより、ノイズ成分の低減する割合を制御する。電子
ズーム倍率によるコアリング量の制御特性を第３図に示
す。電子ズーム倍率が大きくなるにつれてコアリングレ
ベルを上げ、ノイズ成分が低い周波数に変換されて目に
つきやすくなるにしたがってノイズレベルを低減させる
。このようにコアリングレベルを制御することにより電
子ズームの倍率を上げた場合においても、目につきやす
いノイズ成分を低減することが出来る。このようにして
ノイズ成分を低減したアパーチャ信号に、遅延回路１１
で遅延させた信号を加算回路１５で加算し、補間回路４
によシ水平方向，垂直方向とも一定の倍率となるよう補
開演算して電子ズーム信号を合成する。補開演算は必要
とされている点（目標点）と周囲の４画素のそれぞれの
重心点である４点からの距離に反比例した重みをつけて
内挿する演算を行なう。内挿演算は水平，垂直方向を独
立で行なっても良く、また高次の補開演算でも良い。こ
のようにして輝度信号を補間して電子ズーム信号とする
。色差信号も同様に補間処理を行ない電子ズーム信号と
して出力する。色差信号の帯域は輝度信号に比較して捧
〜Ａと低く、補開演算を行なう画素信号のサンプリンク
周波数も輝度信号系の捧〜Ａにすることも可能である。Image sensor 1 and γ, matrix circuit 2 luminance signal y
and two color difference signals U▼ are obtained. The HPF 12 separates the frequency components of the band for aperture correction, and the gain setting circuit 13 sets the amount of compensation for the high frequency components to achieve the desired frequency characteristics. In the coring circuit 14, high frequency noise components are reduced by a nonlinear circuit whose input/output characteristics are shown in FIG. The zoom control circuit 16 controls the reduction rate of the noise component by controlling the size of the nonlinear portion 20 (hereinafter referred to as "coring level"). FIG. 3 shows the control characteristics of the coring amount depending on the electronic zoom magnification. As the electronic zoom magnification increases, the coring level is increased, and as the noise component is converted to a lower frequency and becomes more noticeable, the noise level is reduced. By controlling the coring level in this way, even when the magnification of the electronic zoom is increased, it is possible to reduce the noise component that is easily noticeable. The delay circuit 11 applies the aperture signal whose noise component has been reduced in this way.
The signals delayed by the adding circuit 15 are added, and the interpolating circuit 4
Then, the electronic zoom signal is synthesized by performing compensation calculations to obtain a constant magnification in both the horizontal and vertical directions. The compensation calculation is performed by interpolating weights that are inversely proportional to the distances from the required point (target point) and the four points that are the center of gravity of each of the four surrounding pixels. The interpolation operation may be performed independently in the horizontal and vertical directions, or may be a high-order compensation operation. In this way, the luminance signal is interpolated to produce an electronic zoom signal. The color difference signal is also subjected to interpolation processing and output as an electronic zoom signal. The band of the color difference signal is as low as ~A compared to the luminance signal, and it is also possible to set the sampling frequency of the pixel signal on which the compensation calculation is performed to be ~A of the luminance signal system.
補開演算の重み決定及び補間のピッチの決定はズーム制
御回路１６で行なう。ズーム制御の入力端は、ズームＵ
Ｉ’７，ズームＤＯＷＮの信号によシ前記の制御を行な
う。The zoom control circuit 16 determines the weight of the compensation calculation and the pitch of the interpolation. The input end of the zoom control is the zoom U
The above control is performed by the signals I'7 and ZOOM DOWN.
またアパーチャ補正回路１．０１は撮像部のアパーチャ
補正回路であると同時に電子ズーム部のアパーチャ補正
回路を兼ねており、電子ズーム装置を撮像装置に内蔵し
て同一装置として構成した場合、回路の共用化を行なう
ことが可能となり、電子ズームの倍率を上げた場合のＳ
／Ｎの改善を行なうとともに、回路規模の削減も同時に
実現することができる。In addition, the aperture correction circuit 1.01 serves as an aperture correction circuit for the imaging section as well as an aperture correction circuit for the electronic zoom section, and when the electronic zoom device is built into the imaging device and configured as the same device, the circuit can be shared. S when increasing the electronic zoom magnification.
/N can be improved and the circuit scale can be reduced at the same time.
以上のように本実施例によれば電子ズームの倍率を２倍
程度まで上げた場合においても見かけ上のＳ／Ｎ低下を
改善することができ、さらに回路構成要素を共用するこ
とも可能となシ、その実用的効果は大きい。As described above, according to this embodiment, even when the magnification of the electronic zoom is increased to approximately 2 times, the apparent S/N drop can be improved, and it is also possible to share circuit components. Yes, its practical effects are great.
第４図は本発明の第２の実施例を示す電子ズーム内蔵撮
像装置のブロック図である。同図において１０２は第１
の実施例と同様の電子ズーム装置のブロックであり、そ
の内部の各部には第１の実施例と同じ番号を付けて説明
は省略する。４１は光学像の大きさを可変できるズーム
レンズ、４２はズームレンズの倍率を変化させるレンズ
制御回路、４３は撮像装置としてのズーム倍率を制御す
るカメラズーム制御回路である。第１図の構成と異なる
のは撮像部の光学系をズームレンズ４１とし、光学系の
ズーム倍率と電子ズームのズーム倍率をカメラズーム制
御回路４３で制御することである。FIG. 4 is a block diagram of an imaging device with a built-in electronic zoom, showing a second embodiment of the present invention. In the figure, 102 is the first
This is a block of an electronic zoom device similar to that in the first embodiment, and each internal part is given the same number as in the first embodiment, and a description thereof will be omitted. 41 is a zoom lens that can vary the size of an optical image; 42 is a lens control circuit that changes the magnification of the zoom lens; and 43 is a camera zoom control circuit that controls the zoom magnification of the imaging device. The difference from the configuration shown in FIG. 1 is that the optical system of the imaging section is a zoom lens 41, and the zoom magnification of the optical system and the zoom magnification of the electronic zoom are controlled by a camera zoom control circuit 43.
カメラズーム制御回路の制御特性を第６図に示す。横軸
は撮像装置としてのズーム倍率（以下カメラズーム倍率
）であシワイド側を×１倍とし、テレ側を×６倍として
示す。カメラズーム倍率が×１倍から×３倍までは光学
系ズーム倍率４４を×１〜×６倍まで対応させ、×３倍
から×６倍までは電子ズーム倍率４６を×１〜×２倍ま
で変化させて対応する。このように制御することにより
撮像装置としては×１倍から×６倍まで任意の倍率を一
つのカメラズーム制御として実現することができる。FIG. 6 shows the control characteristics of the camera zoom control circuit. The horizontal axis represents the zoom magnification (hereinafter referred to as camera zoom magnification) of the imaging device, with the wide side being x1x and the telephoto side being x6x. When the camera zoom magnification is from x1 to x3, the optical zoom magnification 44 corresponds to x1 to x6, and when the camera zoom magnification ranges from x3 to x6, the electronic zoom magnification 46 corresponds to x1 to x2. Respond by changing. By controlling in this way, the imaging device can realize any magnification from x1 to x6 as one camera zoom control.
したがって、光学系ズーム倍率を小さな倍率で、撮像装
置としては大きな倍率として実現できるため、撮像装置
の光学系の小形化及び軽量化を実現することができる。Therefore, the zoom magnification of the optical system can be small and the imaging device can have a large magnification, so the optical system of the imaging device can be made smaller and lighter.
なお電子ズーム内蔵撮像装置の第２の実施例としては光
学系ズーム倍率としては３倍まで、電子ズーム倍率とし
ては２倍までとしたが、この倍率の組合せに限る必要は
ない。また光学系ズームと電子ズームの制御範囲をカメ
ラズーム倍率３倍で切換る制御としているが、この特性
に限る必要はなく、また両者をオーバーラップして制御
しても良いのは当然である。Note that in the second embodiment of the electronic zoom built-in imaging device, the optical system zoom magnification is up to 3 times, and the electronic zoom magnification is up to 2 times, but there is no need to limit the combination of these magnifications. Further, although the control ranges of the optical system zoom and electronic zoom are controlled to be switched at a camera zoom magnification of 3 times, it is not necessary to limit the characteristics to this, and it is of course possible to control the two in an overlapping manner.
以上のように本発明の電子ズーム内蔵撮像装置の第２の
実施例では光学系を小さく、軽くすることができ、特に
小形化が重要なポータブルのビデオカメラなどにおいて
、その実用的効果は大きい。As described above, in the second embodiment of the electronic zoom built-in imaging device of the present invention, the optical system can be made smaller and lighter, which has a great practical effect especially in portable video cameras and the like where miniaturization is important.
第６図は本発明の電子ズーム装置のブロック図を示すも
のである。同図において電子ズーム内蔵撮像装置と同じ
ものは同じ番号を付し、説明は省略する。同図において
３１は信号を遅延する遅延回路であり、３２は高周波成
分を通過させる高域濾波器（以下ＨＰＦ）であり、３３
．３４は一定の周波数成分を通過させる帯域濾波器（
以下ＢＰＦ）であり、３６は各フィルタからの信号の利
得を制御するゲイン設定回路であり、３６は電子ズーム
倍率により各フィルタから出力される信号のゲインを制
御するとともに補間回路４，５の制御を行なう。第１図
の撮像装置に内蔵した電子ズーム装置と異なる点はアパ
ーチャ補正信号を合成するためのフィルタを複数個用い
、異なる帯域の信号を分離して各信号ごとに独立にゲイ
ンを設定する点にある。FIG. 6 shows a block diagram of the electronic zoom device of the present invention. In the same figure, the same parts as the electronic zoom built-in imaging device are given the same numbers, and the explanation will be omitted. In the figure, 31 is a delay circuit that delays a signal, 32 is a high-pass filter (hereinafter referred to as HPF) that passes high frequency components, and 33 is a delay circuit that delays a signal.
．． 34 is a bandpass filter (
36 is a gain setting circuit that controls the gain of the signal from each filter, and 36 controls the gain of the signal output from each filter by the electronic zoom magnification, and also controls the interpolation circuits 4 and 5. Do this. The difference from the electronic zoom device built into the imaging device shown in Figure 1 is that it uses multiple filters to synthesize aperture correction signals, separates signals in different bands, and sets the gain independently for each signal. be.
前記のように構成された本実施例の電子ズーム装置につ
いて以下その動作を説明する。The operation of the electronic zoom device of this embodiment configured as described above will be described below.
ＨＰＦ３２及びＢＰＦ−▲３３ ，ＢＰＦ−Ｂ３４によ
りアパーチャ補正信号に必要な周波数成分を分離する。Frequency components necessary for the aperture correction signal are separated by the HPF 32, BPF-▲33, and BPF-B34.
各フィルタの特性は第７図に示す。同図において横軸は
周波数であり、入力される信号帯域の最大の周波数を１
に規格化して示す。ＨＰＦ３２は帯域の最とも高い成分
を分離し、ＢＰＦ−Ｂ３４は帯域のほぼ１ｈ程度のとこ
ろを分離する。The characteristics of each filter are shown in FIG. In the figure, the horizontal axis is the frequency, and the maximum frequency of the input signal band is 1
It is standardized and shown. The HPF 32 separates the highest component of the band, and the BPF-B 34 separates approximately 1 h of the band.
そしてゲイン設定回路３５では、各フィルタのゲインを
電子ズーム倍率に対応して設定を行なう。Then, the gain setting circuit 35 sets the gain of each filter in accordance with the electronic zoom magnification.
ゲイン設定の特性を第８図に示す。電子ズーム倍率が比
較的低い範囲では尖鋭感の低下は少なくノイズ成分の少
ないＢＰＦ−Ｂａａの帯域を＋３ｄＢプーストする。ま
た電子ズーム倍率が２倍に近いところでは尖銃感の低下
が多くなり、尖鋭感の十分に改善される最とも高い帯域
ＨＰＦ３２の成分を＋ｔｓ ｄＢプーストする。このと
き、信号成分と同時にノイズ成分も同時にブーストされ
るため、コアリング回路１４の特性を同時に制御してＳ
／Ｎの低下を最少限にとどめる。コアリングの制御特性
は第３図の破線で示す特性に制御する。ブースト周波数
、プースト量ともに高く大きくなる電子ズーム高倍率の
領域で、コアリング量を大きく設定する。このようにし
て合成したアパーチャ成分と、遅延り路３１を通した信
号と加算回路１５で混合し、補間回路４にて信号を内挿
し信号の倍率を拡大して出力する。色差信号、Ｕ．▼に
ついては補間回路６によシ信号を内挿し信号の倍率を拡
大して出力する。ズーム制御回路３６はゲイン設定回路
３６、コアリング回路１４、補間回路４，５を前記のよ
うに電子ズーム倍率に応じて制御する。ズーム制御の入
力端はズームｕｐかズームＤＯＷＮの信号を入力して、
前記の制御を行なう。Figure 8 shows the gain setting characteristics. In a range where the electronic zoom magnification is relatively low, the BPF-Baa band with less deterioration in sharpness and less noise components is boosted by +3 dB. Furthermore, where the electronic zoom magnification is close to 2x, the sharpness is more likely to deteriorate, and the component of the highest band HPF 32 where the sharpness is sufficiently improved is boosted by +ts dB. At this time, since the noise component is boosted at the same time as the signal component, the characteristics of the coring circuit 14 are simultaneously controlled and the S
/N is kept to a minimum. The control characteristics of the coring are controlled to the characteristics shown by the broken line in FIG. The coring amount is set large in the electronic zoom high magnification area where both the boost frequency and the boost amount are high and large. The aperture component thus synthesized and the signal passed through the delay path 31 are mixed in an adder circuit 15, and the signal is interpolated in an interpolation circuit 4 to be magnified and output. Color difference signal, U. Regarding ▼, the interpolation circuit 6 interpolates the y signal, magnifies the signal, and outputs the signal. The zoom control circuit 36 controls the gain setting circuit 36, the coring circuit 14, and the interpolation circuits 4 and 5 according to the electronic zoom magnification as described above. Input the zoom up or zoom down signal to the input end of the zoom control.
The above control is performed.
以上のように、本実施例によれば、アパーチャ補正回路
のプースト量及びプースト周波数を制御できるようにＨ
ＰＦ３２ ，ＢＰＦ−▲３３，ＢＰＦ−Ｂ３４を設け、
またコアリング回路１４によりコアリングレベルを制御
できるようにし、これらを電子ズーム倍率に応じて制御
することにより、それぞれの電子ズーム倍率において適
切な制御が可能となり、尖鋭感を低下させずにＳ／Ｎ比
の低下も最小限にすることが可能となる。As described above, according to the present embodiment, the boost amount and boost frequency of the aperture correction circuit can be controlled by
PF32, BPF-▲33, BPF-B34 are provided,
In addition, the coring level can be controlled by the coring circuit 14, and by controlling these according to the electronic zoom magnification, appropriate control can be performed at each electronic zoom magnification, and S/ It is also possible to minimize the decrease in the N ratio.
なお電子ズーム装置の実施例においてアパーチャ補正回
路で３つの帯域に分離したが、帯域分離の数は３つにか
ぎる必要はない。またフィルタの特性やコアリングレベ
ルの制御特性及びゲイン設定の制御特性も本実施例の特
性に限る必要はない。Note that in the embodiment of the electronic zoom device, the aperture correction circuit separates the signal into three bands, but the number of band separations does not need to be limited to three. Furthermore, the characteristics of the filter, the control characteristics of the coring level, and the control characteristics of the gain setting are not limited to those of this embodiment.
またアパーチャ補正回路の複数のフィルタのすべてのゲ
インを制御したが一部固定としても良い。Furthermore, although all the gains of the plurality of filters in the aperture correction circuit are controlled, some of them may be fixed.
発明の効果
以上説明したように、本発明によれば電子ズームの倍率
に合せて例えばアパーチャ補正回路のコアリングレベル
を制御することにより電子ズームを行なった場合におい
てもＳ／Ｈの低下を最小限にとどめ、またアパーチャ補
正回路のブースト量やブースト周波数を制御することに
よシ電子ズームのそれぞれの倍率においても尖鋭度の低
下を少なくすることができる。Effects of the Invention As explained above, according to the present invention, the decrease in S/H can be minimized even when electronic zoom is performed by controlling, for example, the coring level of the aperture correction circuit according to the magnification of electronic zoom. In addition, by controlling the boost amount and boost frequency of the aperture correction circuit, it is possible to reduce the decrease in sharpness at each magnification of the electronic zoom.
さらに電子ズーム装置を撮像装置に内蔵した場合、アパ
ーチャ補正回路を共用することができ、また光学系のズ
ーム制御スイッチと連動さすことにより光学系のズーム
の代用として使用でき、また光学系を小形、軽量化する
ことができ、その実用的効果は大きい。Furthermore, when an electronic zoom device is built into an imaging device, the aperture correction circuit can be shared, and by linking with the zoom control switch of the optical system, it can be used as a substitute for zooming the optical system. The weight can be reduced, and its practical effects are great.
第１図は本発明における一実施例の電子ズーム内蔵撮像
装置のブロック図、第２図は同実施例のコアリング回路
の特性の一例を示す図、第３図は同実施例のコアリング
レベルの制御特性の例を示す図、第４図は本発明の第２
の電子ズーム内蔵撮像装置のブロック図、第５図はカメ
ラズーム倍率の制御特性を示す図、第６図は本発明にお
ける一実施例の電子ズーム装置のブロック図、第７図は
同実施例のフィルタ特性を示す図、第８図は同実施例の
アパーチャのブーストレベルの制御特性を示す図、第９
図は従来の電子ズーム装置のブロノク図である。
１・・・・・・撮像素子、４，６・・・・・・補間回路
、１６，３６・・・・・゛・ズーム制御回路、４１・・
・・・・ズームレンズ、４２・・・・・・レンズ制御回
路、４３・・・・・・カメラズーム制御回路、１０１，
２０１・・・・・・アパーチャ補正回路、１０２・・・
・・・電子ズーム装置。
代理人の氏名 弁理士 粟 野 重 孝 ほが１名一
二〉
第
図
第
図
電子ズーム滑早
箒
図
乃メラスームＰＩ竿
第
図
第
図
（ｎＩ）
電子ズーム壇牽Fig. 1 is a block diagram of an imaging device with a built-in electronic zoom according to an embodiment of the present invention, Fig. 2 is a diagram showing an example of the characteristics of a coring circuit of the embodiment, and Fig. 3 is a coring level of the embodiment. FIG. 4 is a diagram showing an example of the control characteristics of the second embodiment of the present invention.
5 is a diagram showing the control characteristics of the camera zoom magnification, FIG. 6 is a block diagram of an electronic zoom device according to an embodiment of the present invention, and FIG. 7 is a diagram showing the control characteristics of the camera zoom magnification. FIG. 8 is a diagram showing the control characteristics of the aperture boost level of the same embodiment. FIG. 9 is a diagram showing the filter characteristics.
The figure is a Bronok diagram of a conventional electronic zoom device. 1...Image sensor, 4, 6...Interpolation circuit, 16, 36...Zoom control circuit, 41...
...Zoom lens, 42...Lens control circuit, 43...Camera zoom control circuit, 101,
201...Aperture correction circuit, 102...
...Electronic zoom device. Name of agent: Patent attorney Shigetaka Awano 1 person
2〉 Figure Figure Electronic Zoom Smooth Broom Figure Merasoom PI Rod Figure Figure (nI) Electronic Zoom Podium Figure
Claims (5)
正回路と、アパーチャ補正された信号を補間する補間回
路と、ズーム倍率に対応して前記アパーチャ補正回路及
び前記補間回路の特性を制御するズーム制御回路を備え
たことを特徴とする電子ズーム装置。(1) An aperture correction circuit that compensates for the high frequency component of the input signal, an interpolation circuit that interpolates the aperture-corrected signal, and a zoom control that controls the characteristics of the aperture correction circuit and the interpolation circuit in accordance with the zoom magnification. An electronic zoom device characterized by being equipped with a circuit.
リング特性を制御することを特徴とする請求項１記載の
電子ズーム装置。(2) The electronic zoom device according to claim 1, wherein the zoom control circuit controls coring characteristics of the aperture correction circuit.
スト周波数とブースト量又はそのどちらかを制御するこ
とを特徴とする請求項１記載の電子ズーム装置。(3) The electronic zoom device according to claim 1, wherein the zoom control circuit controls a boost frequency and/or a boost amount of the aperture correction circuit.
は３記載の電子ズーム装置を備えたことを特徴とする電
子ズーム内蔵撮像装置。(4) An image pickup device with a built-in electronic zoom, comprising an image pickup device that performs photoelectric conversion, and the electronic zoom device according to claim 1, 2, or 3.
象となる光学像の大きさを変化させることのできるズー
ムレンズと、前記ズームレンズのズーム倍率を変化させ
るレンズ制御回路と、前記撮像素子からの信号を電子的
にズームする電子ズーム装置と、前記電子ズーム装置の
ズーム倍率を変化させるズーム制御回路と、カメラズー
ム制御回路とを備え、このカメラズーム制御回路は、レ
ンズ光学系のズーム倍率が一定の基準より大きくなった
ときにズーム制御回路を制御して電子ズームのズーム倍
率を上げ、また電子ズームのズーム倍率が一定の基準よ
り小さくなったときにレンズ制御回路を制御してレンズ
光学系のズーム倍率を下げることを特徴とする電子ズー
ム内蔵撮像装置。(5) an image sensor that performs photoelectric conversion; a zoom lens that can change the size of an optical image to be subjected to photoelectric conversion; a lens control circuit that changes the zoom magnification of the zoom lens; a zoom control circuit that changes the zoom magnification of the electronic zoom device; and a camera zoom control circuit that changes the zoom magnification of the lens optical system. When the zoom magnification of the electronic zoom becomes larger than a certain standard, the zoom control circuit is controlled to increase the zoom magnification of the electronic zoom, and when the zoom magnification of the electronic zoom becomes smaller than a certain standard, the lens control circuit is controlled and the lens optical An imaging device with a built-in electronic zoom, characterized by lowering the zoom magnification of the system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63286165A JPH0691631B2 (en) | 1988-11-11 | 1988-11-11 | Electronic zoom device and imaging device with built-in electronic zoom |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63286165A JPH0691631B2 (en) | 1988-11-11 | 1988-11-11 | Electronic zoom device and imaging device with built-in electronic zoom |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02131679A true JPH02131679A (en) | 1990-05-21 |
| JPH0691631B2 JPH0691631B2 (en) | 1994-11-14 |
Family
ID=17700782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63286165A Expired - Lifetime JPH0691631B2 (en) | 1988-11-11 | 1988-11-11 | Electronic zoom device and imaging device with built-in electronic zoom |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0691631B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04157988A (en) * | 1990-10-22 | 1992-05-29 | Matsushita Electric Ind Co Ltd | Horizontal line interpolating circuit and image pickup device |
| EP0521367A2 (en) * | 1991-06-21 | 1993-01-07 | Sanyo Electric Co., Ltd. | Video signal processing circuit |
| JPH066655A (en) * | 1992-06-23 | 1994-01-14 | Canon Inc | Video camera |
| US6151070A (en) * | 1993-09-30 | 2000-11-21 | Canon Kabushiki Kaisha | Image pickup apparatus |
| JP2007336257A (en) * | 2006-06-15 | 2007-12-27 | Matsushita Electric Ind Co Ltd | Imaging device having focus-assisting function |
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| JPS57174986A (en) * | 1981-04-20 | 1982-10-27 | Matsushita Electric Ind Co Ltd | Aperture correcting circuit of video camera |
| JPS6113881A (en) * | 1984-06-29 | 1986-01-22 | Hitachi Ltd | Core ring circuit of profile correcting device for television camera |
| JPS6146676A (en) * | 1984-08-10 | 1986-03-06 | Matsushita Electric Ind Co Ltd | Profile correction circuit |
| JPS6210777A (en) * | 1985-07-09 | 1987-01-19 | Canon Inc | Processing method for picture |
| JPS62154880A (en) * | 1985-12-26 | 1987-07-09 | Sony Corp | Method for interpolating video signal |
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| JPS63220679A (en) * | 1987-03-10 | 1988-09-13 | Canon Inc | Image pickup device |
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| JPS57174986A (en) * | 1981-04-20 | 1982-10-27 | Matsushita Electric Ind Co Ltd | Aperture correcting circuit of video camera |
| JPS6113881A (en) * | 1984-06-29 | 1986-01-22 | Hitachi Ltd | Core ring circuit of profile correcting device for television camera |
| JPS6146676A (en) * | 1984-08-10 | 1986-03-06 | Matsushita Electric Ind Co Ltd | Profile correction circuit |
| JPS6210777A (en) * | 1985-07-09 | 1987-01-19 | Canon Inc | Processing method for picture |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04157988A (en) * | 1990-10-22 | 1992-05-29 | Matsushita Electric Ind Co Ltd | Horizontal line interpolating circuit and image pickup device |
| EP0521367A2 (en) * | 1991-06-21 | 1993-01-07 | Sanyo Electric Co., Ltd. | Video signal processing circuit |
| EP0521367A3 (en) * | 1991-06-21 | 1994-03-30 | Sanyo Electric Co | |
| JPH066655A (en) * | 1992-06-23 | 1994-01-14 | Canon Inc | Video camera |
| US6151070A (en) * | 1993-09-30 | 2000-11-21 | Canon Kabushiki Kaisha | Image pickup apparatus |
| JP2007336257A (en) * | 2006-06-15 | 2007-12-27 | Matsushita Electric Ind Co Ltd | Imaging device having focus-assisting function |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0691631B2 (en) | 1994-11-14 |
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