Image Acquisitionand Proces

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Displaying Images 83 FIGURE 4.37 Vision window tools palette — multiple tools demonstration. Polygon (Tool 5): The example above includes a demonstration of the polygon tool — the n-sided polygon begins with a left mouse click, and each subsequent side is deÞned by the next mouse click. The polygon is then closed to the Þrst point with a double click. Free (Tool 6): As its name suggests, this tool allows the user to draw a freehand ßat-sided region in the image. The Þrst point is deÞned by left clicking, as are subsequent vertices. Double clicking will close the ROI. Annulus (Tool 7): An annulus is the area between two concentric sliced circles. This tool is useful when analyzing parts like spanners, and terminal clamps. The two circles are initially created with a left click drag (Þrst click deÞnes the center of the circles, and the second deÞnes the radius of the outer circle), and then the slice and radius of the inner circle is deÞned by dragging the appropriate ROI handles. Zoom and Pan (Tools 8 and 9): These tools allow the user to manipulate the way an image is displayed, by either magnifying a portion of the image, to moving within the image. Zoom and pan are very useful when the user needs to observe small areas of a large image, zooming in and then moving the viewable area to adjacent areas. Broken and Free-Hand Lines (Tools 10 and 11): As you can see from Figure 4.38, broken and free lines allow the user a free way of deÞning open and closed ROIs. The broken line creates a line as the user draws (click and drag to create the region), which is useful to trace features in the image, whereas the free line joins the last point deÞned with the Þrst, creating a closed region. Rotated Rectangle (Tool 12): The rotated rectangle tool is very useful when a rectangular ROI is required, but the part’s acquired image is not exactly aligned with the coordinate system of the image acquisition system. The user can Þrst draw the rectangle, and then rotate it by moving one of the ROI’s rotation handles.
84 Image Acquisition Processing with LabVIEW Annulus Free Line Broken Line FIGURE 4.38 Vision tools palette — more tools. 4.5.2 VISION TOOLS PALETTE HINTS While using the region tools, you can alter their functionality by using a tool by pressing certain keyboard keys, much like the selection tools when using Windows Explorer or Microsoft ® Word. If you hold down Shift while drawing a ROI, it constrains the region’s Dx and Dy dimensions to be equal, forcing free-hand rectangles to form squares, and ellipses to circles. Interestingly, if you hold down the Shift key when drawing a line segment, it will be forced to be either horizontal or vertical, and also constrains the rotation of rectangles and annuluses to multiples of 45∞ from horizontal. As is common with Windows ® applications, holding down the Control key while drawing elements on an image allows you to create multiple instances. To erase a previously created element, either select it and press the Delete key, or simply create a new element without holding down the Control key.
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IMAGE PROCESSING SERIES Series Edit
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Foreword The introduction of LabVIE
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FIGURE 1 Vision 6.1 FIGURE 2 Compan
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Acknowledgments My gratitude goes o
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Dedication To Don “old fella” P
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Contents Chapter 1 Image Types and
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Chapter 4 Displaying Images........
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Chapter 7 Image Analysis...........
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1 Image Types and File Management F
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Image Types and File Management 3 F
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Image Types and File Management 5 A
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Image Types and File Management 7 C
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Image Types and File Management 9 p
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Image Types and File Management 11
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Image Types and File Management 13
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2 Setting Up You should never under
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Setting Up 17 FIGURE 2.3 (a) Interl
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Setting Up 19 Linear Aray Light Sou
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Setting Up 21 FIGURE 2.7 National I
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Setting Up 23 2.1.3.2 Control and I
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Setting Up 25 FIGURE 2.11 X-Ray ima
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Setting Up 27 Apple Computer techno
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Setting Up 29 FIGURE 2.17 An inexpe
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Setting Up 31 Although this would b
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134 Image Acquisition Processing wi
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6 Morphology When applied to vision
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Morphology 143 I Closed { } = Erode
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Morphology 145 FIGURE 6.3 Simple mo
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Morphology 147 FIGURE 6.5 Custom st
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Morphology 149 FIGURE 6.8 Particle
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Morphology 151 FIGURE 6.12 Fill hol
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Morphology 153 FIGURE 6.17 Danielss
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Morphology 155 Detected circles wit
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Morphology 157 6.5 CASE STUDY: FIND
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Morphology 159 6.6 USER SOLUTION: D
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Morphology 161 ULTRASOUND MACHINE (
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Morphology 163 FIGURE 6.31 The Edit
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8 Machine Vision A generally accept
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Machine Vision 219 TABLE 8.1 “IMA
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Machine Vision 221 TABLE 8.3 Input
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Machine Vision 223 packages, includ
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Machine Vision 225 good sense to ad
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Machine Vision 227 TABLE 8.4 “IMA
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Glossary 1-Bit Image An image compr
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Glossary 231 binary display device
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Glossary 233 spatial Þlters, each
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Glossary 235 Resolution There are t
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