JPH0448777U - - Google Patents
Info
- Publication number
- JPH0448777U JPH0448777U JP8999890U JP8999890U JPH0448777U JP H0448777 U JPH0448777 U JP H0448777U JP 8999890 U JP8999890 U JP 8999890U JP 8999890 U JP8999890 U JP 8999890U JP H0448777 U JPH0448777 U JP H0448777U
- Authority
- JP
- Japan
- Prior art keywords
- contrast value
- change rate
- optical means
- value change
- focal position
- 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
- 230000003287 optical effect Effects 0.000 claims 5
- 238000003384 imaging method Methods 0.000 claims 3
- 238000001514 detection method Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Focusing (AREA)
Description
図面は本考案の一実施例を示し、第１図は合焦
装置を示す構成説明図、第２図は第１図のタイミ
ング発生回路の動作を説明するための図、第３図
はレンズの焦点位置とコントラスト値の関係の一
例を示す特性曲線図、第４図はレンズのコントラ
スト変化率の一例を示す特性曲線図である。
１……レンズ、２……モータ、３……イメージ
ヤ、４……プロセス回路、５……バンドパスフイ
ルタ、６……タイミング発生回路、９……コント
ロールユニツト、１０……整流回路、１１……積
分回路、１２……Ａ／Ｄ変換回路、１３……演算
回路。
The drawings show one embodiment of the present invention; FIG. 1 is a configuration explanatory diagram showing a focusing device, FIG. 2 is a diagram for explaining the operation of the timing generation circuit shown in FIG. 1, and FIG. FIG. 4 is a characteristic curve diagram showing an example of the relationship between the focal position and the contrast value. FIG. 4 is a characteristic curve diagram showing an example of the contrast change rate of the lens. DESCRIPTION OF SYMBOLS 1... Lens, 2... Motor, 3... Imager, 4... Process circuit, 5... Band pass filter, 6... Timing generation circuit, 9... Control unit, 10... Rectifier circuit, 11... ...Integrator circuit, 12...A/D conversion circuit, 13...Arithmetic circuit.
Claims (1)
して得る撮像部と、 この撮像部が前記光学手段の少なくとも２箇所
の焦点位置で撮像した映像のコントラスト値を検
出するとともにコントラスト値の変化率を算出す
るコントラスト値変化率検出手段と、 この検出手段の検出したコントラスト値変化率
と予め記憶されている前記光学手段の焦点位置の
変化によるコントラスト値変化率と対比して、被
写体の映像のコントラスト値が最大となる前記光
学手段の焦点位置を算出する演算手段と、 この演算手段の算出した焦点位置に基づいて前
記撮像部の光学手段を駆動する駆動手段とを備え
たことを特徴とする合焦装置。[Claims for Utility Model Registration] An imaging unit that images a subject through optical means and obtains a video signal; and this imaging unit detects the contrast value of the image captured at at least two focal positions of the optical means. a contrast value change rate detection means for calculating a contrast value change rate; and comparing the contrast value change rate detected by this detection means with a contrast value change rate due to a change in the focal position of the optical means stored in advance. , comprising a calculation means for calculating a focal position of the optical means at which the contrast value of the image of the object is maximized, and a driving means for driving the optical means of the imaging section based on the focal position calculated by the calculation means. A focusing device characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8999890U JPH0448777U (en) | 1990-08-30 | 1990-08-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8999890U JPH0448777U (en) | 1990-08-30 | 1990-08-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0448777U true JPH0448777U (en) | 1992-04-24 |
Family
ID=31824385
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8999890U Pending JPH0448777U (en) | 1990-08-30 | 1990-08-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0448777U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62272218A (en) * | 1986-05-20 | 1987-11-26 | Victor Co Of Japan Ltd | Autofocusing device |
-
1990
- 1990-08-30 JP JP8999890U patent/JPH0448777U/ja active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62272218A (en) * | 1986-05-20 | 1987-11-26 | Victor Co Of Japan Ltd | Autofocusing device |
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