Image Acquisitionand Proces

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Image Processing 117 FIGURE 5.46 Unwrap — wiring diagram. 5.6.4 3D VIEW A grayscale image has three dimensions — each pixel on a two-dimensional spatial plane has an intensity component, hence the third dimension. An often-useful method of displaying these intensity maps is by using the Vision Toolkit’s 3D View, where each pixel’s intensity value is represented spatially (Figure 5.47). As you can see, the three-dimensional representation is also artiÞcially shaded. This technique is achieved using IMAQ 3D View (Figure 5.48). IMAQ 3D View is also useful to plot non-Vision two-dimensional arrays by Þrst converting them to IMAQ images (Figure 5.49). FIGURE 5.47 3D view. The example in Figure 5.50 shows a two-dimensional array dataset plotted Þrst as a image (in a similar fashion to an intensity graph) and then as a 3D View image. 5.6.5 THRESHOLDING Thresholding enables you to select ranges (often referred to as the threshold interval) of pixel intensity values in grayscale and color images, effectively compressing the values outside of the range to their respective extremes. I New Ï 0 IOld < RangeLow Ô = ÌI Range £ I £ Range Ô Ó 255 IOld > RangeHigh Old Low Old High
118 Image Acquisition Processing with LabVIEW FIGURE 5.48 3D view — wiring diagram. FIGURE 5.49 3D view: plot two-dimensional array — wiring diagram. FIGURE 5.50 3D view — plot two-dimensional array.
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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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Setting Up 33 134 -115 \ Contrast =
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Setting Up 35 resolution printer wi
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Setting Up 37 C A B C Traditional T
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Setting Up 39 Camera Light Source O
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Setting Up 41 Camera Light Source (
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Setting Up 43 FIGURE 2.37 (a) An ob
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Setting Up 45 FIGURE 2.41 (a) PCB p
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48 Image Acquisition Processing wit
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168 Image Acquisition Processing wi
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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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Image Acquisitionand Proces

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