June 2021System Integration & Control Systems Design
TwinCAT Vision, the Beckhoff image processing solution, offers with the new TwinCAT HMI Control Package the option of integrating image processing into the TwinCAT HMI user interface. This includes an expanded image display control and a colour control.
The image display control enables directly linking multiple image variables and switching easily between displayed images. It also supports the following:
• Freezing the image to stop it refreshing and allow detailed analysis of the last capture.
• Scaling and moving the image within the vision control (by means of touch gestures, mouse input, or direct entry of specific values) for more precise viewing of image details.
• Displaying a toolbar with directly usable control elements (e.g. for selecting images, scaling, creating shapes, freezing the image refresh and downloading the displayed image).
• Displaying an information bar showing current details and values, such as image size, pixel coordinates, colour values and shape data.
• Drawing shapes (points, lines, rectangles, ellipses and polygons) with modifiable positions and sizes, used to determine size, area and coordinates and to set regions of interest, among other things.
• Displaying graphics (a cross, rectangles and circles) or image overlays for the purpose of setting up and positioning cameras and workpieces.
Without the convenience of this control, users would have to go through the time-consuming process of creating and coding these capabilities themselves with the help of other elements. The new image control, which incorporates a large number of separate other controls as well as extensive JavaScript programming, makes these capabilities available in full and in a readily configurable form.
In addition, the Vision HMI package’s colour control provides the following features:
• Three options for entering and displaying colour values (a text box, a slider and a colour input element in the browser).
• Flexible configuration and editing of the number of channels, the value range and available controls.
• A choice of horizontal or vertical orientation.
• Conversion between various colour formats, such as gray scale, RGB and HSV.
The colour control likewise incorporates various other controls as well as JavaScript programming. It can also link to a four-element array variable to edit a colour filter directly from the PLC. This, too, saves users time and engineering effort when integrating image processing into control applications.
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