Opencv.js如何绘制轮廓子集? [英] Opencv.js How to draw a subset of contours?

问题描述

使用Opencv.js，我已经获得了图像中的轮廓.

Using Opencv.js I have acquired the contours in an image.

使用一些选择功能，我收集了这些轮廓的子集.

using some selection function I have collected a subset of these contours.

说它们在轮廓列表中:

var suitableContours = [];

我需要知道使用opencv绘制这些轮廓.

I need to know draw these contours using opencv.

如果这是python，我可以做到

If this were python I could do

cv.drawContours(img, [suitableContours[cnt]], 0, [255, 0, 0, 255], 2);

假设要绘制轮廓，我无权访问原始图像，蒙版或原始轮廓列表，而无法访问选定的轮廓.

Assume by the point I want to draw the contours I don't have access to the original image nor the mask nor the original contour list, only the selected contours.

如何绘制这些轮廓?

上面的代码导致: BindingError:无法将"[object Object]，[object Object]"作为MatVector传递

推荐答案

来自 https://docs.opencv.org/3.4/d5/daa/tutorial_js_contours_begin.html

尝试这样的事情:

let color = new cv.Scalar(255,0,0,255);
for (let i = 0; i < suitableContours.size(); ++i) {
    cv.drawContours(src, suitableContours, i, color, 1, cv.LINE_8, hierarchy, 100);
}
cv.imshow('canvasOutput', src);

这篇关于Opencv.js如何绘制轮廓子集?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！