knighto05's profile - activity

Hello everyone,

I tried to replicate the Interactive Foreground extraction of python here into Javascript.

The first part with GC_INIT_WITH_RECT (which is already in the JS doc) works fine. But then I try to refine the selection with GC_INIT_WITH_MASK.

This is my code so far:

let src = cv.imread("canvasInput");
  cv.cvtColor(src, src, cv.COLOR_RGBA2RGB, 0);
  let newmask = cv.imread("canvasAdjust");
  let mask = new cv.Mat.ones(newmask.rows, newmask.cols, newmask.type());
  src.setTo(new cv.Scalar(0, 0, 255), mask);
  let bgdModel = new cv.Mat();
  let fgdModel = new cv.Mat();
  let rect = new cv.Rect();

// Setting the mask
for (let i = 0; i < newmask.rows; i++) {
    for (let j = 0; j < newmask.cols; j++) {
      if (newmask.ucharPtr(i, j)[1] == 128) {
        // if green, tell the mask that it's foreground
            mask.ucharPtr(i, j)[0] = cv.GC_FGD;
            mask.ucharPtr(i, j)[1] = cv.GC_FGD;
            mask.ucharPtr(i, j)[2] = cv.GC_FGD;
          }
      if (newmask.ucharPtr(i, j)[0] == 255) {
            // if red, tell the mask that it's background
             mask.ucharPtr(i, j)[0] = cv.GC_BGD;
             mask.ucharPtr(i, j)[1] = cv.GC_BGD;
             mask.ucharPtr(i, j)[2] = cv.GC_BGD;
      }

    }
  }
  cv.grabCut(src, mask, rect, bgdModel, fgdModel, 1, cv.GC_INIT_WITH_MASK);

But all it does is so far is some errors with random numbers like Uncaught 6566864 . Pointing out in the line cv.grabCut.

Can you help me to figure out if my approach of setting the mask is wrong and where exactly?

Thank you in advance.

Thank you, for the precious info ! we got it running :D

Ah, now I understand, what you're talking about. I'll attempt some stuff and I'll let you know. Thank you already :)

Opencv.js - grabcut and GC_INIT_WITH_MASK Hello everyone, I tried to replicate the Interactive Foreground extraction of

euh I corrected it later, you can see the corrected version in my fiddle, but I will update the post also to make it fai

Thank you for replying: first: mmh when you says single CV_8U channel, you mean this line: let mask = new cv.Mat.ones(ne

Opencv.js - grabcut and GC_INIT_WITH_MASK Hello everyone, I tried to replicate the Interactive Foreground extraction of