JPS5999883A - Smear correcting system - Google Patents

Smear correcting system

Info

Publication number
JPS5999883A
JPS5999883A JP57208446A JP20844682A JPS5999883A JP S5999883 A JPS5999883 A JP S5999883A JP 57208446 A JP57208446 A JP 57208446A JP 20844682 A JP20844682 A JP 20844682A JP S5999883 A JPS5999883 A JP S5999883A
Authority
JP
Japan
Prior art keywords
video signal
signal
smear
memory
field
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.)
Pending
Application number
JP57208446A
Other languages
Japanese (ja)
Inventor
Mitsuo Takano
光雄 高野
Hideo Nakayama
中山　英夫
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
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 Toshiba Corp filed Critical Toshiba Corp
Priority to JP57208446A priority Critical patent/JPS5999883A/en
Publication of JPS5999883A publication Critical patent/JPS5999883A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
    • H04N25/60—Noise processing, e.g. detecting, correcting, reducing or removing noise
    • H04N25/62—Detection or reduction of noise due to excess charges produced by the exposure, e.g. smear, blooming, ghost image, crosstalk or leakage between pixels
    • H04N25/625—Detection or reduction of noise due to excess charges produced by the exposure, e.g. smear, blooming, ghost image, crosstalk or leakage between pixels for the control of smear

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Transforming Light Signals Into Electric Signals (AREA)

Abstract

PURPOSE:To obtain a video signal with high quality and less noise by providing a memory storing temporarily the video signal and a vertical smear information signal respectively to correct the video signal by the vertical smear information obtained on the same field as that of the video signal. CONSTITUTION:The video signal from a solid-state image pickup element camera 1 is inputted to an LPF3 of a still picture transmitter 2, and a signal passing through an LPF3 is sampled by the clock from a clock generating section 9. The sampled signal is A/D-converted at an A/D converter 4 and written in a field memory 5 for one field's share. Further, the noise component of the signal for 1H's share including the smear component is reduced by an integration circuit 6 and inputted to a 1H memory 7 via a converter 4. The video signal and the smear information signal of the memories 5, 7 are read by the clock from a clock generating section 9 of a low speed, the smear information obtained on the same field as that of the video signal is processed by a subtractor 10 and the video signal of good quality is outputted from a D/A converter 8.

Description

【発明の詳細な説明】 〔発明の技術分野〕 本発明は固体撮像素子を使用したテレビカメラ等では常
に発生する垂直スメア現象の補正方式に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for correcting the vertical smear phenomenon that always occurs in television cameras and the like using solid-state image sensors.

〔発明の技術的背景〕[Technical background of the invention]

ＣＣＤ、ＭＯＳなどに代表される固体撮像素子をテレビ
カメラの光電変換素子に利用したとき、垂直転送部ある
いは垂直信号線に発生した電荷が偽信号となり、画面上
では垂直方向に蝿を引く現象となって現れる。これがい
わゆる垂直スメア現象である。この現象は、ブルーミン
グと異なり、各画素の光電変換部が飽和することによっ
て起こるものではなく、富に外部よりの入射光量に比例
した量で発生している。When a solid-state image sensor such as a CCD or MOS is used as a photoelectric conversion element in a television camera, the charge generated in the vertical transfer section or vertical signal line becomes a false signal, causing a phenomenon that causes flies to be drawn vertically on the screen. It appears. This is the so-called vertical smear phenomenon. Unlike blooming, this phenomenon does not occur when the photoelectric conversion section of each pixel becomes saturated, but rather occurs in an amount proportional to the amount of incident light from the outside.

そこで、これを補正する方法として、垂直無効期間を空
送りし、そのフィールド内で生じたスメアＪｊｋを検出
し、これをＡ／Ｄ変換した後１１　Ｈメモリの情報馨り
／Ａ変換して映像信号から差し引き、スメア童の軽減さ
ｖした映像信号を得ている。Therefore, as a method to correct this, the vertical invalid period is skipped, the smear Jjk that occurs in that field is detected, this is A/D converted, and then the information in the 11H memory is converted to A/D and the image is converted to an image. By subtracting it from the signal, a video signal with reduced smearing is obtained.

〔背景技術の問題点〕[Problems with background technology]

このような従来の補正方式では、前フィールドの情報で
次のフィールドを補正するものであるため、動きの速い
被写体に対してをｔ、、補正意が１画面上でノイズとな
って現れるなどの不具合があつＴこ。In conventional correction methods like this, the next field is corrected using the information from the previous field. There is a problem.

〔発明の目的〕[Purpose of the invention]

本発明は、上記した不具合を除去し、良質な画像を再現
することかできる補正方式を得るｆこめになされたもの
である。The present invention has been made with the aim of eliminating the above-mentioned problems and providing a correction method that can reproduce high-quality images.

〔発明の概要〕[Summary of the invention]

本発明でｔ工、現フィールド若しくヲエフレームで得ら
れ１こ垂直スメア情報（ぎ号で映像信号を補正するよ５
にし、そのために映１＃！信号および垂直スメア情報信
号を一時蓄積するメモリを備えＬものとなっている。In the present invention, vertical smear information obtained in the current field or in the current frame is used to correct the video signal.
And for that reason, Ei 1#! It is equipped with a memory for temporarily storing signals and vertical smear information signals.

〔発明の実施例〕[Embodiments of the invention]

本発明１工、静止画伝送装置に適用し１こ場合に、本発
明の目的を達成することはもちろんのこと、静止画伝送
装置が本来備えている１フイールドメモリある（慢ｉ１
フレームメモリを本発明のｆこめにも使用でき、本発明
の効果乞最もよく発揮″ｆる。When the present invention is applied to a still image transmission device, it not only achieves the object of the present invention, but also utilizes the field memory that the still image transmission device originally has.
Frame memory can also be used in the present invention to maximize the effects of the present invention.

第１図は、本発明を静止画伝送装置に適用した場合の一
実施例を示すブロック構成図である。FIG. 1 is a block diagram showing an embodiment of the present invention applied to a still image transmission device.

図において、固体撮像素子を使用し１こカメラ１からの
映像信号は、静止画伝送装置２に入力され、低域ろ波器
３を経た後、クロック発生部９かものクロックにより例
えば１０ＭＨｚでサンプリングされ、Ａ／Ｄ変換器４に
よりＡ／Ｉ）変換され、フィールドメモリ５に１フイ一
ルド分誉き込まれる。最後の空送り部分、丁ブエわちス
メア成分のみを含んだＩＨ分の信号警工、積分回路６に
よりランダムノイズ分が軽減され、増幅されＴこ後、通
常の映像信号と同じようにＡ／ｉ）変換器を経て別に設
けられたＩＦ■メモリ７に入力される。次に帯域変換を
行なうｆこめに、フィールドメモリ５からは低速で、例
えば５ｋＨｚのクロックパルスでｊ＠次ＩＨづつ１己１
、橡されていγこ信号が読み出され、Ｄ／Ａ変換器８を
経て狭帯域映像信号と１〜て伝送路に出力されるわけで
あるが、このとき、フィールドメモリ５から絖み出され
ムニ各１）■の映像信号に同期して前記のスメア成分が
記憶されていたＩＨメモリ７からも（Ｈ号が出力され、
映像信号からそのスメア分が引き算される。この動作は
１フイールドが終るまで各ＩＨ毎に繰り返され、画面と
しては最終的には垂直スメアの軽減された画像が得られ
る。In the figure, a video signal from a single camera 1 using a solid-state image sensor is input to a still image transmission device 2, passes through a low-pass filter 3, and then is sampled at, for example, 10 MHz by a clock generator 9. The signal is then A/I converted by the A/D converter 4, and one field is stored in the field memory 5. In the last blank feed part, the random noise component is reduced by the IH signal guard, which contains only the smear component, and the integrating circuit 6, and is amplified.After that, the A/ i) The signal is input to a separately provided IF memory 7 via a converter. Next, at the time when band conversion is performed, the field memory 5 transmits data at a low speed, for example, with a clock pulse of 5 kHz, for each
The γ signal is read out from the field memory 5 and output to the transmission line along with the narrowband video signal via the D/A converter 8. In synchronization with the video signal of each Muni 1)■, the IH memory 7 in which the above-mentioned smear component was stored also outputs (H),
The smear amount is subtracted from the video signal. This operation is repeated for each IH until one field is completed, and an image with reduced vertical smear is finally obtained on the screen.

なお、９′臀工低速のクロックを発生するクロック発生
部、１月工引算器である。Note that 9' is a clock generator that generates a low-speed clock and a January subtractor.

第２図の（ａ）１エカメラから得られ１こスメア成分の
含んだ映像信号で、斜線Ｓはスメア成分である。ＶＢＬ
は垂直無効期間（すなわち、ここには実際の画素６１存
在せず、転送のみが行われｆこ部分）で、その中の最初
の１）■（あるいを工複数Ｈ）で、スメア成分のみが出
力される。（ｂ）＆エフイールドメモリが読み出される
時のＩＨメモリ７の出力である。各ＩＨ毎に同量のスメ
ア成分が引き算される。但し、本発明で（′＠これに工
Ａ　／Ｄ変換されたデジタル蓋である。（Ｃ１は本静止
画伝送装置より出力されるスメア補正された映像信号で
ある。第３図の（ａ）は垂直スメアの存在する画像で画
面中央部の高入射光量部分の上下に尾を引いている。（
ｂ）　）Ｘスメア補正が行なわれｆこ画像である。(a) in FIG. 2 is a video signal obtained from one camera and containing one smear component, and the diagonal line S indicates the smear component. VBL
is the vertical invalid period (that is, the actual pixel 61 does not exist here, only the transfer is performed), and in the first part (1) (or the number of pixels H), only the smear component is detected. is output. (b) This is the output of the IH memory 7 when the &F yield memory is read. The same amount of smear component is subtracted for each IH. However, in the present invention, ('@) is a digital cover that has been A/D converted. (C1 is a smear-corrected video signal output from this still image transmission device. (a) in Fig. 3) is an image with vertical smear, with tails above and below the high incident light intensity area in the center of the screen. (
b)) This is an image after X smear correction has been performed.

このように、本実施例によれば、既存の静止画伝送装置
に簡単な［！？［を追加するだけで、固体撮像素子の欠
点の一つである垂直スメア乞補正することができ、回路
素子も商運のものを公休の鯛きによるノイズも発生しな
い。As described above, according to this embodiment, the existing still image transmission device can be easily added to [! ? By simply adding [[], it is possible to correct vertical smear, which is one of the drawbacks of solid-state image sensors, and the circuit elements do not generate noise due to public holidays.

なお、本発明は、静止画伝送装置に適用ｊ石場合に限ら
れるもので警工な（、プＩ／ビカメラ内に設けてもよ（
、その他固体撮像索子ンエリアセンサとして使用するフ
ァクシミリに適用してもよい。It should be noted that the present invention is limited to the case where it is applied to a still image transmission device;
The present invention may also be applied to facsimiles used as other solid-state imaging area sensors.

〔発明の効果〕〔Effect of the invention〕

以上説明し１こよ５に、本発明によれば、同じフィール
ドで検出され１ごスメア成分で補正か行なわれるので、
ノイズの少ない映像信号（画像信号）が得られ、良質な
映像（画ＩＩ！　）　’＆再現することができろうAs explained above, according to the present invention, correction is performed using the smear component detected in the same field.
It will be possible to obtain a video signal (image signal) with less noise and reproduce high quality video (Image II!).

【図面の簡単な説明】[Brief explanation of the drawing]

第１図１工本発明の一実施例のブロック図、第２図はス
メア補正の原理を表わ丁波形図、第３図はスメアのある
画像と補正された画像をそれぞれ示す図である。 １・・・・固体撮像素子カメラ、２・・・。 静止画伝送装置、３・・・・ＬＰＦ、４・・・・ｋ／Ｄ
ｆ換器、５・・・・フィールドメモリ、６・―・・積分
回路、７φ・番・１１１メモリ、８・・・・Ｄ／に変換
器、９．９′・・・・クロック発生部、１０・φ・・引
算器。 代理人　弁理士　則近憲ｑｉ（ほか１名）第１図 膚与、づし召 −−−４８！＝FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a waveform diagram showing the principle of smear correction, and FIG. 3 is a diagram showing an image with smear and a corrected image, respectively. 1... Solid-state image sensor camera, 2... Still image transmission device, 3...LPF, 4...k/D
f converter, 5...Field memory, 6...Integrator circuit, 7φ/number 111 memory, 8...Converter to D/, 9.9'...Clock generator, 10・φ・・Subtractor. Agent: Patent attorney Norihiko Norihiko (and 1 other person) Figure 1: 48! =

Claims (1)

【特許請求の範囲】[Claims] 固体撮像素子より得られた映像信号を垂直スメア情報信
号により補正するスメア補正方式において、映像信号お
よび垂直スメア情報信号をそれぞれ一時蓄槓Ｔるメモリ
を備え、映像信号を当該映像信号と同一のフィールド若
しくはフレームで得られＴこ垂直スメア情報信号により
補正するよ５にし１こことを特徴とするスメア補正方式
。In a smear correction method that corrects a video signal obtained from a solid-state image sensor using a vertical smear information signal, a memory is provided to temporarily store the video signal and the vertical smear information signal, and the video signal is stored in the same field as the video signal. Alternatively, the smear correction method is characterized in that it is corrected using a vertical smear information signal obtained in a frame.
JP57208446A 1982-11-30 1982-11-30 Smear correcting system Pending JPS5999883A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57208446A JPS5999883A (en) 1982-11-30 1982-11-30 Smear correcting system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57208446A JPS5999883A (en) 1982-11-30 1982-11-30 Smear correcting system

Publications (1)

Publication Number Publication Date
JPS5999883A true JPS5999883A (en) 1984-06-08

Family

ID=16556338

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57208446A Pending JPS5999883A (en) 1982-11-30 1982-11-30 Smear correcting system

Country Status (1)

Country Link
JP (1) JPS5999883A (en)

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