I have been trying to increase the maximum number of blobs detected with the BlobDetection library from the default 1000 to 2000.
I can successfully detect up to 1000 blobs/circles, can read their x and y position and size, but for the scope of my project I would like to read an higher number of circles/blobs.
I had a look in the library and found that there’s a set amount of maximum blobs that can be detected, and that amount has been set to 1000.
Then found some documentation online here: http://www.v3ga.net/processing/BlobDetection/index-page-documentation.html#top
the bits that interests me I believe to be :
_static void setConstants(int blobMaxNb, int blobLinesMaxNb, int blobTrianglesMaxNb) _
Will set all the constants for memory allocation for different objects used by all instances of BlobDetection class:
# blobMaxNb is the maximum number of blobs that an instance of BlobDetection can store. (default value is 1000)
# blobLinesMaxNb is the maximum number of edges (“lines”) a single blob can store. (default value is 4000 )
# blobTrianglesMaxNb* is the maximum number of triangles a single blob can store. (default value is 500 )
so in my code I have been trying to add the setConstant, and change it but:
1# I cannot increase the maximum number of blob detected
2# I get a “warning” message in my code saying that “The static method setConstants(int,int,int) from the type BlobDetection should be accessed in a static way”.
I have tried several different ways to put the setConstants in my sketch and looked up online for static void, access static void, static variables, but have been unsuccessful so far.
here my code below, I have tried to clean it up as much as possible and leave as many comments as possible for readability
import blobDetection.*;
BlobDetection theBlobDetection;
PGraphics img; // this is to create my own image
//PImage img; // this is to test premade image
PrintWriter output; // to output to txt file
int counter; // to count the number of circles
int circlesNumber = 1500; // to define how many circles I want to draw when creating my own image
int blobMaxNb = 2000; // here I am trying to increase the max number of blobs detected from the default 1000 to 2000
int blobLinesMaxNb = 4000; // same as library default value
int blobTrianglesMaxNb = 500; // same as library default value
void setup() {
size (880, 680);
img = createGraphics(width, height);
//img = loadImage("dots_11.png");
output = createWriter("Circle_Detection.txt");
// DRAW IMAGE WITH CIRCLES
img.beginDraw();
img.background(0);
img.noStroke();
img.fill(255);
int minRandom = 2;
int maxRandom = 6;
int edge = maxRandom;
for (int i=0; i<circlesNumber; i++) {
img.fill(random(175, 255));
int r = (int)random(minRandom, maxRandom);
img.ellipse(random(edge, img.width-edge ), random(edge, img.height-edge), r, r);
}
img.endDraw();
theBlobDetection = new BlobDetection(img.width, img.height);
theBlobDetection.setPosDiscrimination(false);
theBlobDetection.setThreshold(0.01);
theBlobDetection.computeBlobs(img.pixels);
// testing this, I am trying tio increase the max number of blobs detected from the default 1000 to 2000
theBlobDetection.setConstants(blobMaxNb, blobLinesMaxNb, blobTrianglesMaxNb); //
// error message:
// "The static method setConstants(int,int,int) from the type BlobDetection should be accessed in a static way"
}
void draw() {
image(img, 0, 0, width, height);
drawBlobsAndEdges(true, true);
output.close(); // Finishes the txt file
//
noLoop();
}
void drawBlobsAndEdges(boolean drawBlobs, boolean drawEdges) {
noFill();
Blob b;
EdgeVertex eA, eB;
for (int n=0; n<theBlobDetection.getBlobNb(); n++) {
b=theBlobDetection.getBlob(n);
if (b!=null) {
// COUNT CIRCLES
counter = counter + 1;
// and READ POSITION and SIZE, convoluted but works
float temp = ((b.yMin-1)* -1);
float yTD = map(temp, 0, 1, 0, 1);
float relSize = ((b.w+b.h)/2);
println(nf(counter, 3, 0), nf(b.xMin, 0, 5), nf(yTD, 0, 5), nf(relSize, 0, 5));
//PRINT TO txt file
output.println(nf(counter+0, 3, 0) + " " + nf(b.xMin, 0, 5) + " " + nf(yTD, 0, 5) + " " + nf(relSize, 0, 5) + " "); // Write the coordinate to the file
// Edges
//
if (drawEdges) {
strokeWeight(0.5);
stroke(0, 255, 0);
for (int m=0; m<b.getEdgeNb(); m++) {
eA = b.getEdgeVertexA(m);
eB = b.getEdgeVertexB(m);
if (eA !=null && eB !=null)
line(eA.x*width, eA.y*height,
eB.x*width, eB.y*height);
}
}
// Blobs
if (drawBlobs) {
// draw rect on circle location
strokeWeight(1);
stroke(255, 0, 0);
rect(b.xMin*width, b.yMin*height,
b.w*width, b.h*height);
}
}
}
}
I am aware that occasionally I am drawing two circles overlapping in my PGraphics img, and that they are detected as one circle, but I will deal with that separately.
any help to point me in the right direction would be appreciated!