detect colored blobs

General Discussion Other

clankill3r

in General Discussion • Other • 4 months ago

Does anyone know a blobscanner that is able to detect colored blobs?

I have a image for testing here.

My idea is to make 3 blob scanners, one for red, one for green and one for blue. But all they seem good in is black and white and not in colors.

hope someone can help

Replies(4)

pauline303

4 months ago

I would use blobdetection from v3ga. then you could compute centroid, and getpixel to know the color of blobs… ? what do you think ?

clankill3r

4 months ago

That's a smart solution.

I just made this:

PImage img;
PImage preparedImage;
color brightDetect = color(255, 0, 0);
color darkDetect = color(161, 52, 52);
void setup() {
img = loadImage("blob_testImage.png");
size(img.width, img.height);
preparedImage = img.get();
}
void draw() {
prepareBlobImage(img, preparedImage, brightDetect, darkDetect);
image(preparedImage, 0, 0);
text(frameRate, 20, 20);
}
void prepareBlobImage(PImage source, PImage target, color c1, color c2) {
float h1 = hue(c1);
float s1 = saturation(c1);
float b1 = brightness(c1);
float h2 = hue(c2);
float s2 = saturation(c2);
float b2 = brightness(c2);
float minH = min(h1, h1);
float maxH = max(h1, h2);
float minB = min(b1, b2);
float maxB = max(b1, b2);
float minS = min(s1, s2);
float maxS = max(s1, s2);
float h, s, b;
source.loadPixels();
for (int i = 0; i < source.pixels.length; i++) {
h = hue(source.pixels[i]);
s = saturation(source.pixels[i]);
b = brightness(source.pixels[i]);
if (h >= minH && h <= maxH && b >= minB && b <= maxB && s >= minS && s <= maxS) {
target.pixels[i] = MAX_INT;
} else {
target.pixels[i] = 0;
}
}
target.updatePixels();
}

But checking the center pixel of the blob will be a lot faster.