HDevelop User's Manual

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26 CHAPTER 2. GRAPHICAL USER INTERFACE zooming factor by 1 roughly increases the enlargement by a factor of 2. 3 You can select a particular pixel by single-clicking on it with the left mouse button. The zooming tool stores this position internally, and will redisplay the thus selected part of the image object when you leave the graphics window. This enables you to have a meaningful display in the zooming tool whenever you want to do actions outside of the graphics window. Î×ÙÐÞØÓÒ º ÖÝ À×ØÓÖÑ ÁÒÓººº This menu item opens a sophisticated tool for the inspection of gray value histograms, that can also be used to select thresholds interactively and to set the range of displayed gray values dynamically. Figure 2.15 shows the layout of the gray histogram inspection window. Figure 2.15: Online gray histogram inspection. When opening the tool, the histogram of the image shown in the currently active graphics window is displayed. When the tool is already open, four modes of sending new image data to the tool are available. The simplest mode is to display an image in the active graphics window. Whenever you do so, the histogram of this image is computed and drawn, and the tool records the graphics window from which the image was sent. Another simple method to send new data to the tool is to single-click into an image that is displayed 3 Yes, only roughly by a factor of 2, since the image is scaled such that the red square that indicates the mouse pointer position is located in the middle of the zooming window. Therefore, the zoom factor is adjusted to display one pixel more than the power of 2 indicated by the zooming factor. The width and height of the zoomed part of the image hence are ¾ ·½,where is the zooming factor. <strong>HDevelop</strong> / 2000-11-16
2.3. MAIN WINDOW 27 in a graphics window. The third mode can be used whenever image data is displayed overlaid with region data in a graphics window (the graphics window does not need to be active for this). In this mode, you can click into any of the segmented regions, and the histogram of the image within that region will be computed and shown. If you click into a part of the image that is not contained in any of the overlaid regions, the histogram of the entire image will be displayed. In the fourth mode, the same mechanism is used for regions that have gray value information, e.g., image objects created by ÖÙ ÓÑÒ or ÒÒÐ×. Here, the histogram of the image object you click into will be displayed. Finally, when the graphics window the image was sent from is cleared, the histogram is not reset. When a multi-channel image, e.g., a RGB color image, is sent to the tool, by default the histogram of the first channel is displayed. The combo box ÒÒÐ lets you select the channel from which to compute the histogram. The radio box in the upper center of the tool lets you select whether to display the histogram with relative or absolute frequencies. When you select ÊÐ, the frequencies of individual gray values are displayed as percentages; when you select ×, they are displayed as the actual number of pixels having a particular gray value. See the operator ÖÝ ×ØÓ in the HALCON Reference <strong>Manual</strong>s for details. Sometimes it is desirable to suppress the updating of the histogram when new image data is available, e.g., if you want to select thresholds for a gradient image, but want to visualize the original image along with the segmentation (see below). To do so, you can deselect the checkbox ÔØ. The main part of the tool is the area, in which the histogram of the image is displayed in blue. This area contains static parts and parts that can be interactively manipulated. The first static part is the horizontal coordinate axis, which displays the gray values in the image. For byte images, this range is always 0 . . . 255. For all other image types, e.g., real images, the horizontal axis runs from the minimum to the maximum gray value of the image, and the labeling of the axis is changed accordingly. To the left of the display, the vertical axis representing the frequency of the gray values is drawn in white. The final static parts of the display are three cyan arrows. The two upward pointing arrows denote the maximum and minimum grayvalue of the image. The downward pointing arrow denotes the gray value that occurs most frequently, i.e., the peak of the histogram. These data are displayed in textual form within the ËØØ Ø area of the display. The dynamic parts of the histogram area are the three colored lines, which can be manipulated. The dashed horizontal yellow line can be dragged vertically. The label on this line indicates the frequency of gray values above this line. The vertical green and red lines denote the minimum and maximum selected gray value of the histogram, respectively. The selected range is drawn as a white bar below the horizontal gray value axis. The gray values on which the two vertical lines lie are displayed next to the lines in the same color. The frequency of the respective gray values is displayed within the ÝÒÑ Ø area of the display. The selected range of gray values can be used for two major purposes. First, when the combo box ×ÔÐÝ is set to ÌÖ×ÓÐ, the image, from which the histogram was computed, is segmented with a ØÖ×ÓÐ operation with the selected minimum and maximum gray value. Depending on the setting of the combo box ËÒ, the segmentation result is either displayed in the graphics window, from which the image was originally sent (ËÒ = ), or in the active graphics window (ËÒ = ÌÓ ØÚ). Second, if 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
Page 11 and 12: 1.2. EXAMPLE SESSION 3 Figure 1.1:
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Page 21 and 22: 2.3. MAIN WINDOW 13 A security chec
Page 23 and 24: 2.3. MAIN WINDOW 15 a directory whe
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 47 and 48: 2.3. MAIN WINDOW 39 output paramete
Page 49 and 50: 2.3. MAIN WINDOW 41 is registered i
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
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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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