Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>Here's my attempt using ImageJ:</p> <pre><code> // Open the Image ImagePlus image = new ImagePlus(filename); // Make the Image 8 bit IJ.run(image, "8-bit", ""); // Apply a Threshold (0 - 50) ByteProcessor tempBP = (ByteProcessor)image.getProcessor(); tempBP.setThreshold(0, 50, 0); IJ.run(image, "Convert to Mask", ""); // Analyze the Particles ParticleAnalyzer pa = new ParticleAnalyzer( ParticleAnalyzer.SHOW_MASKS + ParticleAnalyzer.IN_SITU_SHOW, 1023 + ParticleAnalyzer.ELLIPSE , rt, 0.0, 999999999, 0, 0.5); IJ.run(image, "Set Measurements...", "bounding fit redirect=None decimal=3"); pa.analyze(image); int k = 0; double maxSize = -1; for (int i = 0; i &lt; rt.getCounter(); i ++) { // Determine creteria for best oval. // The major axis should be much longer than the minor axis. // let k = best oval } double bx = rt.getValue("BX", k); double by = rt.getValue("BY", k); double width = rt.getValue("Width", k); double height = rt.getValue("Height", k); // Your angle: double angle = rt.getValue("Angle", k); double majorAxis = rt.getValue("Major", k); double minorAxis = rt.getValue("Minor", k); </code></pre> <p>How the code works:</p> <ol> <li>Make the image grayscaled.</li> <li>Apply a threshold on it to only get the dark areas. This assumes the lines will always be near black.</li> <li>Apply a Particle Analyzer to find Ellipses on the image.</li> <li>Loop through the "Particles" to find ones that fit our criteria.</li> <li>Get the angle from our Particle.</li> </ol> <p>Here's an example of what the image looks like when I analyze it:</p> <p><img src="https://i.stack.imgur.com/L3CQQ.png" alt="Oval Image"> <img src="https://i.stack.imgur.com/SknWB.png" alt="Oval Image 2"></p> <p><strong>NOTE</strong>: The code is untested. I just converted what I did in the Visual ImageJ into Java.</p>
    singulars
    1. This table or related slice is empty.
    1. POLine detection | Angle detection with Java
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USIvan
    1. USIvan
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POLine detection | Angle detection with Java
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COAWESOOOMMEEE!!! Thanks a lot!!! I got a few quetions though: 1) How did you generate such code from imageJ? 2) I'll be running it on Android, do you have any comments about it?
      singulars
      1. PO
      1. USFelipe Barreiros
    2. COI have quite a lot of experience translating what I do visually to Java, I also use the Macro->Record option a lot. For Android, you'll just need to make sure you can use the ImageJ library and make sure ImageJ doesn't try to present a visual window.
      singulars
      1. PO
      1. USIvan
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload