JPH02123876A - Focus adjustment device - Google Patents
Focus adjustment deviceInfo
- Publication number
- JPH02123876A JPH02123876A JP63276239A JP27623988A JPH02123876A JP H02123876 A JPH02123876 A JP H02123876A JP 63276239 A JP63276239 A JP 63276239A JP 27623988 A JP27623988 A JP 27623988A JP H02123876 A JPH02123876 A JP H02123876A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- television receiver
- focus adjustment
- adjustment device
- adjustment
- 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
Links
Landscapes
- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
- Details Of Television Scanning (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、テレビジョン受像機のフォーカス調整装置に
関し、調整の高速化及び精度の向上を図ったものに関す
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a focus adjustment device for a television receiver, and relates to a focus adjustment device for a television receiver, which is capable of speeding up adjustment and improving accuracy.
［従来の技術］
従来技術は、特開昭５３−６７３１２号公報に記載のよ
うに、カメラからのビデオ信号波形の時間幅測定により
調整を行うものである。この方法であると、ノイズ等の
誤差要因が大きく時間＠測定用のカウンタに高精度のも
のが必要となる。[Prior Art] As described in Japanese Unexamined Patent Publication No. 53-67312, the prior art performs adjustment by measuring the time width of a video signal waveform from a camera. This method has large error factors such as noise, and requires a highly accurate counter for time measurement.
〔発明が解決しようとする課迎］
上記従来技術は、調整方法の点について配慮がされてお
らず！ｌｌ整時間及び調１１精度に問題があった。本発
明の目的は、調整の高速化と精度向上を図ることを可能
にしたテレビジョン受像機のフォーカス調整装置を提供
することにある。[Problem to be solved by the invention] The above conventional technology does not give consideration to the adjustment method! There were problems with adjustment time and adjustment accuracy. SUMMARY OF THE INVENTION An object of the present invention is to provide a focus adjustment device for a television receiver that makes it possible to speed up adjustment and improve accuracy.
［課題を解決するための手段］
上記目的は、画像処理装置を用いてテレビジ３ン受像機
に映し出されたクロスハツチパターンの横線を抽出する
ために、ＴＶカメラからのビデオ信号を８ビツトのデジ
タル信号に変換した後、２値化処理を行い横線幅に相当
する画素数を測定することにより達成される。[Means for Solving the Problem] The above object is to convert a video signal from a TV camera into an 8-bit digital signal in order to extract horizontal lines of a crosshatch pattern displayed on a television receiver using an image processing device. This is achieved by converting into a signal, performing binarization processing, and measuring the number of pixels corresponding to the horizontal line width.
［作用コ
画像処理装置は、画像処理ＣＰＵと、データの合否判定
、デイスプレィ表示等のホストＣＰＵとに分離すること
により、処理の高速化を図っている。２値化処理は、画
像演算回路によりハードウェア化し、画像を取込む毎に
スレッショルドレベルを測定し又、メデイアンフィルタ
使用により横線幅のバラツキをなくし高精度化を図って
いる。[Operations] The image processing device is separated into an image processing CPU and a host CPU that performs data pass/fail determination, display display, etc. to speed up processing. Binarization processing is implemented in hardware using an image calculation circuit, and a threshold level is measured each time an image is captured, and a median filter is used to eliminate variations in horizontal line width and achieve high precision.
横線幅の抽出処理方法は、抽出のエリア指定により処理
時間の短縮を図っている。The horizontal line width extraction processing method aims to shorten the processing time by specifying the extraction area.
［実施例］
以下、本発明の一実施例を第１図、第２図により説明す
る。第１図は本発明の一実施例を示すブロック図、第２
図はその動作態様の説明図である。[Example] An example of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG.
The figure is an explanatory diagram of its operation mode.
モニタテレビ１にメイン基板２を実装し、信号発生器１
０からの第２図（ａ）に示すクロスハツチ信号を受信し
、ＴＶカメラ３よりテレビ画面の映像を抽出し、ＴＶカ
メラ３からのビデオ信号をＡ／Ｄ変換器５により８ビツ
トのデジタル信号に変換する０画像処理部６では、抽出
エリア１２を設定し輝度分布１４を測定した後２値化の
ためのスレッショルドレベルｂを算出し２値化処理を行
う。さらに、クロスハツチパターン１１の横線１３の幅
に相当する画素数ａを測定し、そのデータをＲ８−２３
２Ｃを介してホストＣＰＵ７へ転送する。ホストＣＰＵ
７では、データを受信した後、合否判定をすると共にズ
レ量に応じた分調整モ・−タ９を回転させ、メイン基板
２のフォーカスボリュームを調節する。以上の一連の動
作を、仕様値になるまで繰り返し行うものである。本実
施例によれば、調整時間の短縮が図れ、しかも精度良い
フォーカス調整が可能となる。The main board 2 is mounted on the monitor TV 1, and the signal generator 1
0, extracts the image of the TV screen from the TV camera 3, and converts the video signal from the TV camera 3 into an 8-bit digital signal by the A/D converter 5. The zero image processing unit 6 for conversion sets an extraction area 12 and measures the brightness distribution 14, calculates a threshold level b for binarization, and performs the binarization process. Furthermore, the number of pixels a corresponding to the width of the horizontal line 13 of the crosshatch pattern 11 is measured, and the data is transferred to the R8-23.
2C to the host CPU 7. host CPU
At step 7, after receiving the data, a pass/fail judgment is made and the adjustment motor 9 is rotated according to the amount of deviation to adjust the focus volume of the main board 2. The above series of operations is repeated until the specified value is achieved. According to this embodiment, the adjustment time can be shortened and focus adjustment can be performed with high precision.
［発明の効果］
本発明によれば、高速な画像処理ができ、又、精度良い
調整が実現可能であり、自動調整化が容易となる。[Effects of the Invention] According to the present invention, high-speed image processing is possible, accurate adjustment is possible, and automatic adjustment is facilitated.
第１図は、本発明の一実施例のハード構成図、第２図（
ａ）は、テレビ画面に映し出されたクロスハツチパター
ン、（ｂ）は抽出エリア内の映像、（ｃ）は抽出エリア
内の輝度分布をそれぞれ示す説明図である。
符号の説明
１・・・モニタテレビ、２・・・メイン基板、３・・・
ＴＶカメラ、４・・・同期信号発生器、５・・・Ａ／Ｄ
変換器、６・・・画像処理部、７・・・ホストＣＰＵ、
８・・・デイスプレィ、９・・・調整モータ、１０・・
・信号発生器、１１・・・クロスハツチパターン、１２
・・・抽出エリア、１３・・・クロスハツチ横線、１４
・・・輝度分布、ａ・・・横線幅の画素数、ｂ・・・ス
レッショルドレベル。Figure 1 is a hardware configuration diagram of an embodiment of the present invention, and Figure 2 (
FIG. 3A is an explanatory diagram showing a crosshatch pattern displayed on a television screen, FIG. 3B is an image within an extraction area, and FIG. 3C is an explanatory diagram showing a luminance distribution within an extraction area. Explanation of symbols 1...Monitor TV, 2...Main board, 3...
TV camera, 4... synchronous signal generator, 5... A/D
Converter, 6... Image processing unit, 7... Host CPU,
8...Display, 9...Adjustment motor, 10...
・Signal generator, 11...Cross hatch pattern, 12
...Extraction area, 13...Cross hatch horizontal line, 14
... Brightness distribution, a... Number of pixels of horizontal line width, b... Threshold level.
Claims (1)
信号を映し出すための信号発生器と、画面上に映し出さ
れたクロスハッチパターンをテレビジョン受像機と同期
をとって撮像しビデオ信号として出力するテレビカメラ
と、該テレビカメラからのビデオ信号をアナログ信号か
らディジタル信号に変換するＡ／Ｄ変換器と、Ａ／Ｄ変
換された該ディジタル信号を入力され抽出エリアを設定
し、その輝度分布を測定してスレショルドレベルを定め
て２値化する処理回路と、該２値化データにより前記ク
ロスハッチパターンを構成する線部分の画素数を求め、
該画素数が規定の値になるように前記テレビジョン受像
機のフォーカスを調整する手段と、から成ることを特徴
とするフォーカス調整装置。1. A signal generator for projecting a crosshatch signal on the screen of the television receiver under test, and a signal generator for capturing an image of the crosshatch pattern projected on the screen in synchronization with the television receiver and outputting it as a video signal. A television camera, an A/D converter that converts the video signal from the television camera from an analog signal to a digital signal, the A/D converted digital signal is input, an extraction area is set, and the brightness distribution is measured. a processing circuit that determines a threshold level and binarizes the data; and a processing circuit that determines the number of pixels in a line portion constituting the crosshatch pattern from the binarized data;
A focus adjustment device comprising: means for adjusting the focus of the television receiver so that the number of pixels becomes a prescribed value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63276239A JPH02123876A (en) | 1988-11-02 | 1988-11-02 | Focus adjustment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63276239A JPH02123876A (en) | 1988-11-02 | 1988-11-02 | Focus adjustment device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02123876A true JPH02123876A (en) | 1990-05-11 |
Family
ID=17566637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63276239A Pending JPH02123876A (en) | 1988-11-02 | 1988-11-02 | Focus adjustment device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02123876A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6072546A (en) * | 1996-08-30 | 2000-06-06 | Sony Corporation | Apparatus for and method of measuring focus |
-
1988
- 1988-11-02 JP JP63276239A patent/JPH02123876A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6072546A (en) * | 1996-08-30 | 2000-06-06 | Sony Corporation | Apparatus for and method of measuring focus |
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