HDevelop User's Manual

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28 CHAPTER 2. GRAPHICAL USER INTERFACE ×ÔÐÝ is set to ËÐ, the gray values of the image are scaled such that the gray value 0 of the scaled image corresponds to the minimum selected gray value and the gray value 255 to the maximum selected gray value. Again, the combo box ËÒ determines the graphics window, in which the result is displayed. This mode is useful to interactively set a “window” of gray values that should be displayed with a large dynamic range. If you want to select threshold parameters for a single image, display the image in the active graphics window and open the histogram tool. For optimum visualization of the segmentation results, it is best to set the visualization color to a color different from black or white (see Î×ÙÐÞØÓÒ º ÓÐÓÖ below). Now set ×ÔÐÝ to ÌÖ×ÓÐ and interactively drag the two vertical bars until you achieve the desired segmentation result. The parameters of the threshold operation can now be read off the two vertical lines. If you want to select threshold parameters for an image which is derived from another image, but want to display the segmentation on the original image, e.g., if you want to select thresholds for a gradient image, two different possibilities exist. First, you can display the derived image, open the histogram tool, deselect ÔØ, display the original image, and then select the appropriate thresholds. This way, only one window is needed for the visualization. For the second possibility you can display the derived image in one window, activate another window or open a new window, display the original image there, activate the first window again, open the histogram tool, activate the second window again, set ËÒ to ÌÓ ØÚ, and select your thresholds. Although in this case it is not necessary to deselect ÔØ, it is advantageous to do so, because this prevents the histogram from being updated if you click into a graphics window accidentaly. Î×ÙÐÞØÓÒ º ÊÓÒ ÁÒÓººº This menu item opens a tool for the convenient inspection of shape and gray value features of individual regions. It can, for instance, be used to determine thresholds for operators that select regions based on these features, e.g., ×ÐØ ×Ô or ×ÐØ ÖÝ. Figure 2.16 shows the layout of the region feature inspection window. The strategy to determine the data from which to compute the features is very similar to that of the gray histogram inspection window. You can display an image or region by double-clicking on it in the variable window or you can select a region or an image which is already displayed by single-clicking it. If you display or click into an image, the gray value features of the entire image will be calculated. If you click into a region that is not underlaid with an image, only the shape features of this region will be displayed. If you click into a region that is underlaid with an image or into a region that has gray value information (e.g., from ÖÙ ÓÑÒ or ÒÒÐ×), both the shape and gray value features of that region will be displayed. Finally, if you have overlaid an image with a region, but click into a part of the image that is outside the region, only the gray value features of the entire image will be calculated. Analogously to the gray histogram inspection window, the gray value features of a multichannel image are calculated from the first channel by default. You can use the combo box ÒÒÐ to select the desired channel. The shape features on the left side of the region inspection window are grouped into seven categories, which correspond roughly to individual HALCON shape feature operators. The topmost of the displays shows the most basic region features, namely the area and center of gravity of the region (see Ö ÒØÖ in the Reference <strong>Manual</strong>) and the width and height of the smallest axis-parallel rectangle of the region. The latter is computed from the output of the operator ×ÑÐÐ×Ø ÖØÒÐ½. <strong>HDevelop</strong> / 2000-11-16
2.3. MAIN WINDOW 29 Figure 2.16: Online region feature inspection. The second display contains information about the orientation (ÒÐ) and size of the region along the two principal directions (Ö and Ö) of the region. With the combo box ×Ô, you can select by what means the size is computed. If you select ÐÐÔ×, the size is computed with the operator ÐÐÔØ Ü×. This means that the parameters Ö and Ö are the major and minor axis of an ellipse that has the same moments as the selected region. Note that this ellipse need not enclose the region. If you set ×Ô to ÖØÒÐ, the size is computed with the operator ×ÑÐÐ×Ø ÖØÒÐ¾. This means, that Ö and Ö are half the width and height of the smallest rectangle with arbitrary orientation that completely contains the selected region. The orientation of the region is computed in both cases with the operator ÓÖÒØØÓÒ ÖÓÒ to get the full range of 360 Æ for the angle. You can select whether to display the angle in Ö× or ÖÒ× with the corresponding combo box. The next three displays show simpler shape features of the selected region. The first of these displays shows the contour lenght of the region, i.e., the euclidean length of its boundary (see the operator ÓÒØÐÒØ). The second one shows the compactness of the region, i.e., the ratio of the contour length of the region and the circumference of a circle with the same area as the region (see the operator ÓÑÔØÒ××). The compactness of a region is always larger than 1. The compacter the region, the closer the value of the compactness is to 1. The third display shows the convexity of the selected region, i.e., the ratio of the area of the region and the area of the convex hull of the region (see the HALCON 6.0
Page 1 and 2: HALCON Version 6.0 MVTec Software G
Page 3 and 4: About This Manual This manual is a
Page 5 and 6: Contents 1 Introducing HDevelop 1 1
Page 7 and 8: Contents iii comment . . . . . . .
Page 9 and 10: Chapter 1 Introducing HDevelop In f
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Page 25 and 26: 2.3. MAIN WINDOW 17 Figure 2.7: The
Page 27 and 28: 2.3. MAIN WINDOW 19 and not HDevelo
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Page 31 and 32: 2.3. MAIN WINDOW 23 2.3.2.4 The Men
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Page 39 and 40: 2.3. MAIN WINDOW 31 Figure 2.17: Co
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Page 47 and 48: 2.3. MAIN WINDOW 39 output paramete
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Page 51 and 52: 2.3. MAIN WINDOW 43 ËÙ×ØÓÒ×
Page 53 and 54: 2.3. MAIN WINDOW 45 ÏÒÓÛ º ×
Page 55 and 56: 2.3. MAIN WINDOW 47 Figure 2.31: Th
Page 57 and 58: 2.5. OPERATOR WINDOW 49 The program
Page 59 and 60: 2.5. OPERATOR WINDOW 51 Please refe
Page 61 and 62: 2.6. VARIABLE WINDOW 53 operator ha
Page 63 and 64: 2.6. VARIABLE WINDOW 55 aspect rati
Page 65 and 66: 2.7. GRAPHICS WINDOW 57 Figure 2.38
Page 67 and 68: Chapter 3 Language The following ch
Page 69 and 70: 3.2. CONTROL TYPES AND CONSTANTS 61
Page 71 and 72: 3.4. OPERATIONS ON ICONIC OBJECTS 6
Page 73 and 74: 3.5. EXPRESSIONS FOR INPUT CONTROL
Page 85 and 86: 3.6. RESERVED WORDS 77 ÓÖ, ÜÓÖ
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3.8. LIMITATIONS 79 In the followin
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Chapter 4 Code Generation The idea
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4.1. CODE GENERATION FOR C++ 83 Ì
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4.1. CODE GENERATION FOR C++ 85 tha
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4.2. CODE GENERATION FOR VISUAL BAS
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4.3. CODE GENERATION FOR C 89 4.3 C
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4.4. GENERAL ASPECTS OF CODE GENERA
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Chapter 5 Program Examples This cha
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5.2. CAPILLARY VESSEL 95 ÚÐÓ×Û
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5.2. CAPILLARY VESSEL 97 Figure 5.3
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5.3. PARTICLES 99 each. Now it is e
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5.4. ANNUAL RINGS 101 ÚÐÖÛÒÓ
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5.5. BONDING 103 Figure 5.9: Exampl
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5.7. DEVICES 105 Figure 5.11: Calib
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5.7. DEVICES 107 Figure 5.13: Resis
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5.8. CELL WALLS 109 Figure 5.15: Mi
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5.10. EXCEPTION HANDLING 111 Figure
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5.11. ROAD SCENE 113 any case. All
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5.11. ROAD SCENE 115 tures. Hence a
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Chapter 6 Miscellaneous This chapte
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6.5. RESTRICTIONS 119 Figure 6.1: E
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2 APPENDIX A. CONTROL ÌÙÔÐ½
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4 APPENDIX A. CONTROL Attention For
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6 APPENDIX A. CONTROL Result retur
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8 APPENDIX A. CONTROL ÚÙÔØÛÒ
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10 APPENDIX A. CONTROL HDevelop / 2
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12 APPENDIX B. DEVELOP Attention If
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14 APPENDIX B. DEVELOP Ú ÓÔÒ Û
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16 APPENDIX B. DEVELOP Ú Ò×ÔØ
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18 APPENDIX B. DEVELOP Parallelizat
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20 APPENDIX B. DEVELOP º ÀØ (inp
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22 APPENDIX B. DEVELOP ’black’
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24 APPENDIX B. DEVELOP Parameter º
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26 APPENDIX B. DEVELOP Parameter º
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28 APPENDIX B. DEVELOP If ÊÓÛ½
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30 APPENDIX B. DEVELOP Ú ×Ø ÛÒ
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32 APPENDIX B. DEVELOP Possible Suc
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34 APPENDIX B. DEVELOP See Also Ú
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36 APPENDIX B. DEVELOP HDevelop / 2
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38 APPENDIX C. GLOSSARY Operator wi
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40 Index Ú ×Ø ÔÖØ, 27, 39 Ú
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42 Index Operator Data base, 37 Nam
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44 Index HDevelop / 2000-11-16
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