![]() if strcmp(evt.SelectionType, 'double') & strcmp(evt.SelectedPart, 'label')Īnswer = inputdlg(]) Įnd % Reset the |ButtonDownFcn| callback function with the current |myData| % value. Use this information to % scale all line ROI measurements. % When you double-click the ROI label, the example opens a popup dialog box % to get information about the actual distance. With this information, you can calibrate all the ROI measurements to real world units. The popup dialog box prompts you to enter the known distance and units for this measurement. This function listens for the 'ROIClicked' event, using event data to check the type of click and the part of the ROI that was clicked. This function opens a popup dialog box in which you can enter information about the real-world distance and units. Set(src, 'Label', 'Color',color) Įnd Create Callback Function to Update Measurement UnitsĬreate the function that is called whenever you double-click the ROI label. % Apply the scale factor to line length to calibrate the measurements. The % line changes color as it gets longer or shorter.Ĭolor = (ceil(64*(mag/)),:) % Choose a color from the colormap based on the length of the line. Uimenu(c, 'Label', 'Delete All', updateLabel(src,evt) % Add a custom option to the line ROI context menu to delete all existing % line ROIs. Using the % |beginDrawingFromPoint| method, you can draw multiple ROIs. % Begin drawing the ROI from the current mouse location. When you click on the line % ROI, the |updateUnits| callback opens a GUI that lets you specify the % known distance in real-world units, such as, meters or feet.Īddlistener(h, Get the current mouse location from the |CurrentPoint| property of the % axes and extract the _x_ and _y_ coordinates. ![]() When the line ROI moves, % the |updateLabel| callback updates the text in the line ROI label and % changes the color of the line, based on its length.Īddlistener(h, Set up a listener for clicks on the line ROI. % Set up a listener for movement of the line ROI. Specify the initial color of the line and % store the |myData| structure in the |UserData| property of the ROI. You could also use imwarp with a rotation transform.% Create a line ROI object. The imrotate function lets you rotate an image by specifying an angle in degrees. Theta = acos( u*v' / (norm(u) * norm(v)) ) V = % vector along the vertical, oriented up. u = lines(3).point1 - lines(3).point2 % vector along the vertical left edge. Simply calculate the angle between the vector u = lines(3).point1 - lines(3).point2 and the vertical vector v. (The origin is the top-left corner of the image, x is horizontal to the right and y is vertical down.) lines(3) We want this point to stay where it is, but we want to vector along the line to be aligned with the vector v = '. lines(3).point2 is the end of the line that is at the bottom. Lines(3) is the left vertical edge of the card. The white border around the black background in your image makes detecting the right edges a bit more difficult. lines = houghlines(BW, T, R, P) ĭisplay the detected lines to make sure you find at least one along the edge of the card. P = houghpeaks(H, 100) % detect a maximum of 100 lines Second, find the strongest lines in the image by finding peaks in the Hough transform with houghpeaks. Adjust the resolution so that you detect all lines you need later. Select a block in the Simulink Editor canvas, then perform one of these actions: Pause on the ellipsis, then click the Add Comment button in the action bar. BW = edge(I, 'canny', 0.5) įirst, you need to use the Hough transform on the black and white image, with the hough function. Adjust the threshold to reject noise and weak edges. I = rgb2gray(A) Ī simple way is to use the Canny edge detector. We don't need color information, so convert to grayscale. ![]() I downloaded your image and renamed it card.png. In MATLAB, you can use the Hough line detector to find lines in a binary image. The angle of rotation is then the angle between one of the lines and the horizontal (or vertical). You can do this by finding the lines made by the edges of the card.
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