Retrieve real wood fiber structure from image

Processing Coding Questions
1

I am going to write a program to process an image with very fine wood fibers in it. Please have a look at this for a quick idea - http://alturl.com/7jnuh

What I want to do is keep only the fiber lines in a black and white image and discard other features and colors. How can I use OpenCV to it? Thanks.

2

Not sure. I would get the pixels and then figure out if they are dark or light and then go from there I guess. Maybe compare them to thier neighbours?

3

boofCV has a line detector. You can install it via the Contributor manager in the PDE and try its examples.

Kf

4

If all you need is an image, you can use the built in filters: https://processing.org/reference/filter_.html

If you need more control, I can recommend using shaders like this one: https://github.com/SableRaf/Filters4Processing/tree/master/sketches/ContrastSaturationBrightness

This is an example result:

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Screen Shot 2018-07-13 at 19.39.28.png1116×1160 197 KB

And the modified code for the PDE


PShader myFilter;
PImage  myImage;

void setup() {

  size( 474, 474, P2D );
  
  myImage  = loadImage( "th.jpg" );
  myFilter = loadShader( "shader.glsl" );

}


void draw() {

  background(0);

  // Draw the image on the scene
  image( myImage, 0, 0 );
  
  // For all settings: 1.0 = 100% 0.5=50% 1.5 = 150%
  float c = 2.6;
  float s = 0.0;
  float b = 2.2;

  // Pass the parameters to the shader
  myFilter.set( "contrast",   c );
  myFilter.set( "saturation", s );
  myFilter.set( "brightness", b );

  // Applies the shader to everything that has already been drawn
  filter( myFilter );

}

Download the whole thing here: https://we.tl/44hfxifLXC (link will expire in 7 days)

5

Thank you all for your replies.