Vision MET/METCAD. 2D measurement system

Transcription

1 Vision MET/METCAD 2D measurement system September 2012

2 ~ Contents ~ 1 GENERAL INFORMATION: PRECISION AND RESOLUTION GETTING STARTED: USER IDENTIFICATION MAIN WINDOW OF THE APPLICATION USING THE MEASUREMENT APPLICATION: CALIBRATING THE SYSTEM: MAKING MEASUREMENTS: Positioning a marker: Positioning a vector: Positioning a multipoint line: Positioning a middleline marker: Positioning a polygon: Positioning the calculation of an angle: Positioning a circle: Positioning an arc of a circle by its centre: Positioning a circle using three points: Positioning a multipoint circle: Positioning an arc of a circle using three points: Construct Measures: USING THE VIGNETTE: ADDING A VIGNETTE: ADDING TEXT: ADDING A MARKER: ERASING MARKERS AND TEXT: LICENSE AND INTELLECTUAL PROPERTY TECHNICAL SUPPORT Rév Page 2

3 1 General information: VISION MET/METCAD software is the result of 10 years' experience in computer-vision 2D metrology software. VISION METCAD lets you make 2D measurements of images acquired from a video source, or loaded from a multimedia source (hard disk, CD-ROM, flashdisk, etc) with a transparent DXF overlay. You can load or save in any of the most common Windows formats including BMP, GIF, JPG, PNG and TIF. The main metrology functions are: - Positioning a vector, calculating its length and angle to the plane. - Positioning any polygon, calculating its perimeter and area. - Positioning a circle (by its centre, a point on its circumference or by three points), calculating its circumference, area and radius. - Positioning an arc of a circle (by its centre or three points), calculating its opening angle, length and radius. - Calculating the angle between two vectors. - Projecting a point in a direction. - Intersecting two lines, a line and a circle, or two circles. - Positioning a grid. - Exporting data (copy/paste) to a spreadsheet or word processing program or any application that supports copy/paste. - Saving and loading an image or a work environment. - Calibrating in any system of units. - Steering a camera using software and the calibration parameters stored in memory. - Vignetting system to comment the view in progress by positioning various elements directly on the image. The following CAD functions are available: - Load DXF or DWG file. - Modify the X,Y position of the DXF. - Modify the angle of rotation of the DXF. - Modify the scale of the DXF. - Modify the visibility of "Layers". - Modify the colour of DXF elements. All these operations are simply performed with a mouse. 1.1 Precision and resolution First of all, we need to clarify what we mean by "precision" and "resolution" as they often cause a lot of arguments. Precision: Software such as VISION-MET/METCAD has no intrinsic precision. The only concept of precision that we can talk about, is the precision of the operator who selects an element using a mouse. In fact it is often difficult to tell if the "boundary" of the object to be measured is on a particular pixel, or on the one just next to it. VISION-MET/METCAD cannot help you make this choice. This problem also becomes relevant when we speak about "repeatability of measurements". Rév Page 3

4 By contrast, the word "resolution" does have a meaning in VISION-MET/METCAD. Let's say, for example, that the camera's viewing area corresponds to a 10 mm reel. And let's say that the digital resolution of our image is 1,000 points wide. We can therefore say that 10 points of the image = 0.1 mm reel, or 1 point = 0.01 mm. The resolution of our system is 1 point per 0.01 mm. Let's go back to our word "precision": Now that we have estaablished a calibration which says that 1 point image = 0.01 mm, let's take a next image (the image is deliberately enlarged to make the precision more obvious, with 1 square = 1 pixel). If the selection is perfect, the width of our piece is 18 pixels or 0.18 mm. As reality is never perfect, when the image is digitised the boundary of the object is not perfectly in contrast (figure above). The selection may therefore become: On our piece we have been able to measure 0.2, 0.19, 0.18, 0.17 and 0.16 mm. The variation therefore is from 0.16mm to 0.20 mm. For VISION-MET/METCAD, everything is correct and it corresponds to what the operator has selected. The fault is due to the imprecision of the selection. If it's just a matter of quantifying the possible error imprecision, we can say in this precise case (1 point per 0.01 mm) that the imprecision is 1 point to the left and right, or 0.02 mm.. Rév Page 4

5 2 Getting started: 2.1 User identification When the application is launched, the user identification window is displayed. The name entered will be archived along with all the measurements taken during the session. The user name will also be associated to the calibrations if they are done during the session. After entering your user name in the field, click "Confirm". The window closes to make room for the main window of the application. 2.2 Main window of the application DISPLAY AREA TOOLBOX AREA Display area: This is the area that displays the image which is acquired or loaded from disk This area is also where the user makes the measurements. If the image is larger than the display area, two scroll bars appear automatically. Use these bars to move the image inside the area. Rév Page 5

6 Toolbox area: Use the buttons in this area to select the various operations you want to perform. "Load" button: This button lets you access the loading window: The loading options are: Load an image from a disk. Load an image as well as the associated calibration values. Load an image, the associated calibration values as well as the digital data of the various measurements already made. Load a measurements file. Any size image may be loaded from disk. The image area resizes itself automatically. The following formats are supported: BMP GIF JPG PNG TIF NOTE: When you load an image which has its measurements stored in memory, or when you load a measurements file, the system verifies whether the measurements are within the range of the image. If the measurements are outside the range of the image, they are automatically deleted from the list of measurements. "Save" button: This button lets you access the Save window: You can Save as follows: Save an image to disk. Save an image as well as the associated calibration values. Save an image, the associated calibration values as well as the digital data of the various measurements made. Save an image with the measurements you have made overlaid on it. Save a measurements file. "Save" supports the same formats as "Load". «Copy to clipboard» button This button copy the content of the display area to the clipboard. The image can then be pasted into another document supporting the "Copy / Paste". "Create on Image" buttons: "Marker", "Vector", "Polygon", "Angle" and "Circle": These buttons let you make measurements directly on the image (see below). Rév Page 6

7 "Create on Image" from list: "Projection", "Vector ", "Polygon", "Angle", "Circle" and "Intersections": These buttons let you make measurements using previously generated measurements (see section Making measurements: below). "Measurements List" button: This button lets you display (or return to the first level) the window showing the list of measurements made. If no measurement has been made the list is empty. Options available in the measurements window: Erase Measurement: This option lets you erase the measurement selected (greyed) in the list. Copy Measurements: This option lets you copy the measurements selected in the list (greyed) to the clipboard. You can then paste the selection into various applications such as Excel, Word, etc. Selection boxes: "Markers", "Circles", etc: These options let you show or hide measurements in the list (the measurement that remain visible in the image area). "Grid" button: This option lets you configure and position a grid in the display window. Grid options available: Base X and Y: These values define the base of the grid. The units used are those provided by the calibration. Origin X,Y: These values define the origin point of the grid. These values cannot be greater than the corresponding value. The units used are those provided by the calibration.. Colour: This option lets you specify the colour of the grid. The values defined in this window are stored in memory by the system and are available for further projects. Bouton «Delete measures» : This button clear ALL measures on the current image. "Calibration" button: This option lets you calibration the system in any units you wish, and specify the calibration options: - Calibration name: This field lets you assign a name to the calibration. This name will then be displayed on the "Calibration" button in the main window. - Units: This field lets you specify the name of the units. - Vector length (pixels): This value indicates the length of the calibration distance in pixels (see "Select Calibration Distance" below). - Vector length (units): This field lets you specify the length of the calibration distance in real units. - Operator name: This field indicates the name of the operator who will be associated with the calibration. - Calibration Date: This field indicates the date that will be associated with the calibration. - "Select Calibration Distance": This option lets you select the length of the calibration vector (or calibration vector). Rév Page 7

8 - "Save Calibration ": This option lets you store a calibration. This calibration automatically appears in the list on the main window. - "Delete Calibration ": This option lets you delete a calibration from the list on the main window. NOTE: At system launch, the application automatically loads the last calibration values. Stored calibrations: This list buttons lets you call up the stored calibrations. To store a calibration, do a calibration then save it by clicking the Save Calibration button in the calibration window. CAREFUL: IF YOU CHANGE THE CALIBRATION WHILE MEASUREMENTS ARE IN PROGRESS ON AN IMAGE, THESE MEASUREMENTS WILL NO LONGER CONFORM. "Acquire" button (if the system is equipped with an acquisition device): Click this button to activate the continuous acquisition of images and display them in real time in the display window. When the acquisition is activated, a new dialog area appears on the screen A bar graph entitled "Sharpness Index" is displayed. This index is an aid to adjusting camera focus. The central area of the image (square in the centre) is continuously analysed. The clearer the image, the higher the index. The variance page depends, however, on the complexity of the scene at the centre of the image. An area entitled "Camera" lets you access the various camera functions (zoom, focus, etc) if the system is equipped with an SONY FCB camera. "Acquire Settings" button (if the system is equipped with an acquisition device): The "Settings" button lets you specify the various parameters linked to the acquisition of the image. (the contents of this window depends on the type of the camera/frame grabber which is installed). Namely: Adjust image brightness and contrast. Adjust colour intensity. Select the video input to use. The settings are automatically stored in memory by the software and will be available on restart. Rév Page 8

9 «Zoom» button: This button displays a window that contains a mini magnified view of the area of the image under the mouse cursor. This option facilitates the measurement operations. The image can be displayed only if the acquisition is enabled. "Options" button: This button lets you configure certain application functions. Namely: Default colour of the metrology elements. Information associated with the metrology elements displayed in the image area. "Assign scale": This option lets you assign a scale to the image area. The scale is a segment of a given length (indicated in the field "Scale length") in the units chosen. "Spriting" area: These options let you add vignettes, text and symbols as comments on the current image. These options are deactivated in "Continuous Acquisition" mode. "DXF" button: This button lets you access DXF-file configuration functions. This option is available only with VISION-METCAD version. Load a DXF or DWG file. Delete DXF from memory. Modify the visibility of "Layers". Modify the colour of DXF elements. Position a DXF. Scale DXF. Rotate DXF. Automatically scale a DXF. (to system calibrationing). "Action" area. Rév Page 9

10 Move DXF: You can also move the DXF by holding down the mouse left-button in the image area and dragging the image Rotate DXF. You can also rotate the DXF by holding down the mouse right-button in the image area and dragging the image. Scale DXF. You can change the scale of the DXF by using the scroll wheel on your mouse. During all these operations, the DXF thumbnail changes inside the "Action" area. A red box appears in the "Action" area to show how the DXF is being moved. This box indicates the part of the DXF currently being viewed in the Display area. Rév Page 10

11 3 Using the measurement application: 3.1 Calibrating the system: Every new measurement session must start by calibrating the system. To calibrate the system: 1) Switch the system to continuous acquisition mode then position the object to be measured under the camera and configure the object settings. Once the settings are configured, position your calibrating device under the camera. DO NOT TOUCH THE SETTINGS FROM THIS POINT. 2) Click the "Calibration the System" button. The toolbox disappears to make space for the calibration window. 3) Specify a name for the calibration, and the units, in their respective entry fields. 4) You now need to select, in your display window, a known length in your units system.. Click the "Select Calibration Distance" button. 5) The calibration window closes. Move your cursor inside the display window. You will see that a vertical axis follows your movements. Right-click on the mouse when the vertical axis is correctly positioned on your calibration. Move your cursor again to position the second axis at the end of your calibration. When the axis is correctly positioned, left-click on the mouse. The calibration window is displayed again. The length that you have just selected appears in the "Vector Length in pixels" field. 6) In the "Vector Length in units" field, indicate the real length of the segment, then press "Enter" to confirm.. 7) Now, store the calibration data by clicking " Save Calibration ". This calibration automatically appears in the list on the main window. The "Delete Calibration» button lets you delete a calibration from the list available in the main window of the application. NOTE: The calibration values are valid only for a given type, object and camera height setting. NOTE: If the message "Some data is not valid..." appears, go to the data entry window, find the values marked red, place the cursor on the field, and press "Enter". 3.2 Making measurements: Once you have calibrated the system, you can make measurements: Position the object to be measured under the camera. DO NOT TOUCH THE OBJECT SETTINGS FROM THIS POINT. Use the toolbox functions (markers, vectors, circles, etc) to make your measurements. Rév Page 11

12 3.2.1 Positioning a marker: Click the "Marker" button in the "Create on Image" area. The toolbox disappears. Move your cursor inside the display window. At the desired location, left-click your mouse. If you don't like the location, move your cursor then left-click your mouse again. Once you reach the desired location, confirm by a right-click on your mouse. o Marker name. o Marker colour, If you wish, you can change the default name assigned to the marker as well as its colour. Confirm or Cancel the marker as you wish Positioning a vector: Click the "Vector" button in the "Create on Image" area. The toolbox disappears. Move your cursor inside the display window. At the desired location, left-click your mouse. If you don't like the location, move your cursor then left-click your mouse again. Once you reach the desired location, confirm by a right-click on your mouse. Move your cursor then right-click your mouse to position the end point of the vector. o Vector name. o Vector colour. o Vector length (in the units you've selected). o Vector angle in the plane (0 east, trigonometrically). If you wish, you can change the default name assigned to the vector as well as its colour. Confirm or Cancel the vector as you wish. NOTES: The direction in which you enter the vector defines its orientation. When entering the vector points, pressing "Esc" cancels the entry in progress. While entering the vector points, pressing "Shift" or "Ctrl" constrains the vector direction horizontally or vertically Positioning a multipoint line: Click the "Multipoint Line" button in the "Create on Image" area. The toolbox disappears. Move your cursor inside the display window. At the desired location, right-click your mouse to position the first point of the segment. If you don't like the location, move your cursor then left-click your mouse again. Once you reach the desired location, confirm by a right-click on your mouse. Move your cursor and right-click the mouse button to define antoher point of the segment. Left-click your mouse to confirm the line. The system will complete the line automatically. Rév Page 12

13 o Vector name. o Vector colour. o Vector length (in the units you've selected). o Vector angle in the plane (0 east, trigonometrically). If you wish, you can change the default name assigned to the vector as well as its colour. Confirm or Cancel the vector as you wish Positioning a middleline marker: Click the "Middleline Markere" button in the "Create on Image" area. The toolbox disappears. Move your cursor inside the display window. At the desired location, right-click your mouse to position the first point of the segment. If you don't like the location, move your cursor then left-click your mouse again. Once you reach the desired location, confirm by a right-click on your mouse. Move your cursor and right-click the mouse button to define the second point of the segment. Left-click your mouse to confirm the line. The system will calculate and show the marker automatically. o Marker name. o Marker colour, If you wish, you can change the default name assigned to the marker as well as its colour. Confirm or Cancel the marker as you wish Positioning a polygon: Click the "Polygon" button in the "Create on Image" area. The toolbox disappears. Move your cursor inside the display window. At the desired location, left-click your mouse to position the start point of the first segment. If you don't like the location, move your cursor then left-click your mouse again. Once you reach the desired location, confirm by a right-click on your mouse. Move your cursor to define the end point of the segment. Move your cursor again to define the end point of the next segment. Left-click your mouse to confirm the polygon. The system will complete the polygon automatically. o Polygon name. o Polygon colour. o Polygon radius and circumference (in the units you selected). If you wish, you can change the default name assigned to the polygon as well as its colour. Confirm or Cancel the polygon as you wish. Rév Page 13

14 3.2.6 Positioning the calculation of an angle: Click the "Calculate angle between 2 vectors" button in the "Create on Image" area. The toolbox disappears. At the desired location, left-click your mouse to position the start point of the first vector. If you don't like the location, move your cursor then left-click your mouse again. Once you reach the desired location, confirm by a right-click on your mouse. Move your cursor to define the end point of the vector. Move the cursor again to define the start point of the second vector. At the desired location, left-click your mouse to position the start point of the first vector. If you don't like the location, move your cursor then left-click your mouse again. Once you reach the desired location, confirm by a right-click on your mouse. Move your cursor to define the end point of the second vector then confirm by a right-click on your mouse. o Angle name. o Angle colour. o Angle in degrees as well as its inverse. If you wish, you can change the angle's default name and colour. Confirm or Cancel the angle calculation as you wish. NOTE: Every vector in VISION has an orientation. The angle calculation between two vectors takes into account the orientations of those vectors. Example: V1 V1 FALSE V2 The angle between vectors V1 and V2 is 225. V Positioning a circle: Click the "Circle by circumference or by centre" button in the "Create on Image" area. The toolbox disappears. Move your cursor inside the display window. When you reach the location you want, left-click your mouse to place the first point (either a point on the circumference or the centre of the circle). If you don't like the location, move your cursor then left-click your mouse again. Once you reach the desired location, confirm by a right-click on your mouse. Move your mouse to define the second point (to the centre of the circle if starting from the circumference, or to the outer end of the radius if starting from the centre). Right-click your mouse to confirm the circle. Rév Page 14

15 o Circle name. o Circle colour. o Circle radius, area and circumference (in the units you selected). If you wish, you can change the default name assigned to the circle as well as its colour. Confirm or Cancel the circle as you wish. NOTES: When entering the circle points, pressing "Esc" cancels the entry in progress Positioning an arc of a circle by its centre: Click the "Arc by centre" button in the "Create on Image" area. The toolbox disappears. Move your cursor inside the display window. At the desired location, left-click your mouse to position the centre of the arc. If you don't like the location, move your cursor then left-click your mouse again. Once you reach the desired location, confirm by a right-click on your mouse. Move your cursor to define the start point of the arc. This point also defines the radius of the arc. Right-click your mouse to confirm the point. Move your cursor to define the end point of the arc. Right-click your mouse to confirm the arc. o Name of the arc. o Arc colour. o Arc radius and length (in the units you've selected). If you wish, you can change its default name and colour. Confirm or Cancel the arc as you wish Positioning a circle using three points: Click the "Circle with 3 points" button in the "Create on Image" area. The toolbox disappears. Move your cursor inside the display window. At the desired location, left-click your mouse to position the first point. If you don't like the location, move your cursor then left-click your mouse again. Once you reach the desired location, confirm by a right-click on your mouse. Move your cursor to place the second then third point of the arc. o Circle name. o Circle colour. o Circle radius and length (in the units you've selected). If you wish, you can change the default name assigned to the circle as well as its colour. Confirm or Cancel the circle as you wish. Rév Page 15

16 Positioning a multipoint circle: Click the "Multipoint Circle" button in the "Create on Image" area. The toolbox disappears. Move your cursor inside the display window. At the desired location, right-click your mouse to position the first point of the circle. Move your cursor and right-click the mouse button to define antoher point of the circle. Left-click your mouse to end selection. The system will complete the circle automatically. o Circle name. o Circle colour. o Circle radius and length (in the units you've selected). If you wish, you can change the default name assigned to the vector as well as its colour. Confirm or Cancel the vector as you wish Positioning an arc of a circle using three points: Click the "Arc with 3 points" button in the "Create on Image" area. The toolbox disappears. Move your cursor inside the display window. At the desired location, left-click your mouse to position the start point of the arc. If you don't like the location, move your cursor then left-click your mouse again. Once you reach the desired location, confirm by a right-click on your mouse. Move your cursor to define the middle point of the arc. This point also defines the radius of the arc. Right-click your mouse to confirm the point. Move your cursor to define the end point of the arc. Right-click your mouse to confirm the arc. o Name of the arc. o Arc colour. o Arc radius and length (in the units you've selected). If you wish, you can change its default name and colour. Confirm or Cancel the arc as you wish Construct Measures: Another way to make measurements is to construct measure from existing measures. Projecting a point on a vector: Click the "Projection of a point" button in the "Create by list" area. The toolbox disappears. A list appears with all the available markers. Select the point to be projected, and then confirm your selection. A list appears with all the available vectors. Select the direction vector for the projection, and then confirm your selection. A window appears indicating the resulting vector. o Vector name. o Vector colour. o Vector length (in the units you've selected). Rév Page 16

17 o Vector angle in the plane (0 east, trigonometrically). If you wish, you can change the default name assigned to the vector as well as its colour. Confirm or Cancel the vector as you wish. Creating other elements from the list: To create other objects from the list (circle, vector, etc) use the example above. Rév Page 17

18 4 Using the vignette: The vignette lets you insert comments into the image as text, as well as different markers to highlight faults or any element on the image. NOTE: When "Continuous acquisition" mode is activated, all text and markers disappear from the screen. They are displayed once again when the image freezes. 4.1 Adding a vignette: A "vignette" is a previously acquired image, displayed as a thumbnail in the current image. Getting started: - Begin by acquiring an image by clicking the "Acquire Image" button. - Click the "Add Vignette" button. The view presented in the image area now appears as a thumbnail overlay. - Change the scene under the camera (by zooming in for example), then trigger the acquisition of a new image. You now have a zoomed image on the screen as well as the basic image as a vignette. You can position the vignette any way you wish. To move it, position the cursor on the vignette, then while holding down the left button, move the cursor. When the vignette is where you want it, release the mouse button. To erase a vignette, position the cursor on the vignette then right-click your mouse. A menu appears. Select the option "Erase". To display a vignette across the full screen, position the cursor on the vignette then right-click your mouse. A menu appears. Select the option "Full screen". 4.2 Adding text: Getting started: - Click the "Add Text" button. A text area appears in the image area. - Position the cursor on the text area then right-click. A menu appears. Select the option "Modify". A dialog box lets you modify font colour and size. You can position the text area wherever you like. The Move and Erase procedures are the same as those described above. 4.3 Adding a marker: Getting started: Click the "Add Market" button. A new window appears offering a list of sprites. Rév Page 18

19 Select the sprite you want. The window shuts automatically and the selected sprite appears in the centre of the image area. Move the sprite by using the Move procedure described above. To erase a sprite, position the cursor on the marker then right-click your mouse. A menu appears. Select the option "Erase". NOTE : the sprites are PNG images files. You can create your own sprites with the appropriate editor (Photoshop ou other). The PNG files must be located in the folder where you have installed you program (generaly C:\ProgramFiles\ \Symbol\ ). 4.4 Erasing markers and text: Use the button to erase ALL markers and text present on the image. Rév Page 19

20 5 License and Intellectual Property The license described in this manual is supplied under the terms of a licensing agreement and may be used only in compliance with this agreement: Copyright Copyright ELVITEC. All rights reserved. All technical documentation provided by ELVITEC is subject to copyright and remains the property of ELVITEC. The user is solely responsible for any use of the technical documentation and information contained in it. ELVITEC reserves the right to make any necessary modification without prior notice. 6 Technical support ELVITEC offers technical support for installing, configuring and troubleshooting its products and systems, as well as software updates. ELVITEC can be contacted at support@elvitec.fr ELVITEC Impasse Thomas Edison BP PERTUIS France ****************** Rév Page 20