JPH0174512U - - Google Patents
Info
- Publication number
- JPH0174512U JPH0174512U JP1987169099U JP16909987U JPH0174512U JP H0174512 U JPH0174512 U JP H0174512U JP 1987169099 U JP1987169099 U JP 1987169099U JP 16909987 U JP16909987 U JP 16909987U JP H0174512 U JPH0174512 U JP H0174512U
- Authority
- JP
- Japan
- Prior art keywords
- distance
- histogram
- edge
- distance value
- edge constituent
- 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
- Length Measuring Devices By Optical Means (AREA)
- Image Analysis (AREA)
Description
第１図は本考案に係る同心円検出装置の一例を
示すブロツク図、第２図は本考案の実施例に係る
距離ヒストグラム作成部の作動例を主として示す
フローチヤート、第３図はマスクの設定手法を例
示する図、第４図は同心円中心探索範囲を例示す
る図、第５図は本考案の実施例に係る距離値選択
部の作動例を示すフローチヤート、第６図は距離
ヒストグラムの一例を示す図、第７図は第６図に
示す距離値ヒストグラムから得られる距離値を示
す図、第８図は頻度点積値が最大になる距離値の
選択例を示す図、第９図は同心円を含むエツジ画
像から同心円を検出する様子を例示する図である
。
２……エツジ検出部、４……距離ヒストグラム
作成部、８……距離値選択部、９……同心円存在
度検出部。
Fig. 1 is a block diagram showing an example of the concentric circle detection device according to the present invention, Fig. 2 is a flowchart mainly showing an example of the operation of the distance histogram creation section according to the embodiment of the present invention, and Fig. 3 is a mask setting method. 4 is a diagram illustrating a concentric circle center search range, FIG. 5 is a flowchart illustrating an example of the operation of the distance value selection section according to an embodiment of the present invention, and FIG. 6 is an example of a distance histogram. Figure 7 is a diagram showing distance values obtained from the distance value histogram shown in Figure 6, Figure 8 is a diagram showing an example of selecting a distance value that maximizes the frequency point product value, and Figure 9 is a diagram showing concentric circles. FIG. 3 is a diagram illustrating how concentric circles are detected from an edge image including an edge image. 2... Edge detection section, 4... Distance histogram creation section, 8... Distance value selection section, 9... Concentric circle existence degree detection section.
Claims (1)
力画像からエツジ構成点を検出するエツジ検出手
段と、定点からエツジ構成点までの距離を算出し
てヒストグラムを作成する距離ヒストグラム作成
手段と、該ヒストグラム上のエツジ構成点頻度が
所定閾値を越える距離値を選択する距離値選択手
段と、該選択された距離値におけるエツジ構成点
頻度の積値が所定閾値を越えたときに同心円の存
在を判定する同心円存在度判定手段とを備えるこ
とを特徴とする同心円検出装置。 An image input means for inputting an image of a target landscape; an edge detection means for detecting edge constituent points from the input image; a distance histogram creation means for calculating a distance from a fixed point to an edge constituent point to create a histogram; and the histogram. Distance value selection means for selecting a distance value for which the frequency of edge constituent points above exceeds a predetermined threshold; and determining the existence of concentric circles when the product value of the frequency of edge constituent points at the selected distance value exceeds a predetermined threshold. A concentric circle detection device comprising: concentric circle existence degree determination means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987169099U JPH0174512U (en) | 1987-11-06 | 1987-11-06 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987169099U JPH0174512U (en) | 1987-11-06 | 1987-11-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0174512U true JPH0174512U (en) | 1989-05-19 |
Family
ID=31458865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987169099U Pending JPH0174512U (en) | 1987-11-06 | 1987-11-06 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0174512U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03197803A (en) * | 1989-12-26 | 1991-08-29 | Nitto Seiko Co Ltd | Part shape recognition method and part quality determination method |
-
1987
- 1987-11-06 JP JP1987169099U patent/JPH0174512U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03197803A (en) * | 1989-12-26 | 1991-08-29 | Nitto Seiko Co Ltd | Part shape recognition method and part quality determination method |
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