Aurora Visio Studio TOP » Program Examples » Washers

Washers

目的

This example shows how to find washers with defects or not properly centered.

Input

Set of images with multiple washers.

Output

Image with marked broken and not properly centered washers.

Histogram of distances between inner and outer contour of a washer.

ヒント

Washers can be located by thresholding image and splitting resulting region into blobs.

The FitCircleToStripe filter can be used to find inner and outer circle of a washer.

接続のラベル付けについてはこちらを参照ください。

Solution (AVS)

In Workspace Explorer open workspace Examples and in Film strip window select Washers dataset. Drag the Image channel to the ACQUIRE section.
Add the ThresholdToRegion filter. Set the inMinValue to Auto and the inMaxValue to 200.0 to extract washers.
Add the SplitRegionIntoBlobs filter to obtain separate washers.
Use the RegionMassCenter filter to calculate washer centers. Click on the outMassCenter twice and change its name to MassCenters
Add the CreateCoordinateSystemFromPoint filter and connect MassCenter to the inPoint.
Add the FitCircleToStripe filter. Connect Image to the inImage. Connect the outCoordinateSystem to the inFittingFieldAlignment, that way you will only need to specify fitting field for one washer.
- Run program to refresh the image and coordinate system, they will be later used to specify fitting field.
- Specify the inFittingField. In fitting field editor select washer with coordinate system inside:
- Set the inScanCount to 20 and the inMaxIncompleteness to 0. This will make the filter detect only complete washers and skip broken ones.
- Using Show/Hide Ports show the outInnerCircle.Center and the outOuterCircle.Center. Change their names to InnerCircleCenter and OuterCircleCenter
Add the PointToPointDistance filter to measure distance between the centers of inner and outer circle. Change the name of the output to the WasherErrorOrNil
To create histogram of distances:
- Add the RemoveNils filter for type Real to process only non-broken washers.
- Connect outDistance to the inArray.
- Add the CreateHistogram filter and set the inBinSize to 0.100.
Create a step macrofilter and name it DrawResults.
- Connect the ReadFilmstrip output to the DrawResults to create a new macrofilter input. Check Array checkbox.
- Connect the MassCenters and the WasherErrorOrNil to the DrawResults in order to create new inputs. Check Array checkbox.
- Double-click on the DrawResults to edit the macrofilter.
- Add a new formula to generate labels for washers. Create the Real? input inDistance.
- Create formula outputs:
  - outString, type String?:
    
    (inDistance == Nil) ? "Invalid" : ((inDistance < 0.5) ? "OK" : "NOK")
  - outIsWasherOk, type Bool?:
    
    outString == "OK"
This will mark washer as valid when distance between centers is less than 0.5 and the washer is not broken.
- Add the DrawStrings_MultiColor filter to draw labels on the image. Use the inMassCenter as location.

マクロフィルタメイン

Macrofilter DrawResults draws inspection results on input image

使用したフィルタ

アイコン	名前	説明
	ThresholdToRegion	顕著な明るさによって定義できるオブジェクトの領域の抽出。
	RemoveNils	This filter is useful e.g. when inspecting multiple objects while some of the inspections may fail (Nil result). RemoveNils is used to ignore the failed cases in the final result.
	RegionMassCenter	領域のピクセルの平均座標に等しい座標を持つ点を計算します。
	CreateHistogram	Creates the histogram of the array of real numbers.
	SplitRegionIntoBlobs	オブジェクトが互いに接触していない場合に、領域を個々のオブジェクトにセグメント化します。
	DrawStrings_MultiColor	画像上に複数の色で文字列（テキスト）を描画します。
	PointToPointDistance	Measures the distance between two points.
	CreateCoordinateSystemFromPoint	1D エッジ検出またはブロブ分析の結果からオブジェクトの位置合わせを定義するために最もよく使用されます。
	FitCircleToStripe	Precise detection of ring-shaped objects, whose rough location is known beforehand.