如何使用opencv在python中的图像上制作自由手形状(随机) [英] How to make a free hand shape(random) on an image in python using opencv

问题描述

要在区域中应用边界填充，我需要在python-opencv中使用鼠标绘制自由形状(随机)

To apply boundary fill in a region i need to draw a free hand shape(random) using mouse in python-opencv

推荐答案

您问过如何使用计算机的鼠标在图片上绘制任何给定者随机形状.这是一个简单的解决方案:

You asked how to draw any giver random shape on a picture using your computer's mouse. Here is a simple solution:

首先，您需要设计一种绘制方法.因此，让我们从 OpenCV:Mouse中启发自己作为画笔" ，其中一种方法用于使用鼠标绘制常见的常规形状，例如圆形或矩形.在您的情况下，您将需要像用一只手一样随机绘制.

First, you will need to design a method that enables you to draw. So let's inspire ourselves from OpenCV: Mouse as a Paint-Brush where a method is used to draw common regular shapes such as a circle or a rectangle using a mouse. In your case, you will need random drawing as you could do with your hand.

因此，使用该方法，您可以使用鼠标绘制点并执行 内插 在它们之间使用 cv2.line() 方法:

So using that method you can draw points using the mouse and perform an interpolation between them using cv2.line() method:

cv2.line(im,(current_former_x,current_former_y),(former_x,former_y),(0,0,255),5)

im是您所阅读的图像，并且您必须始终记住鼠标位置的先前坐标:

Where im is the image you read and while you must memorize the former coordinates of the mouse position all the time:

current_former_x = former_x
current_former_y = former_y

完整的OpenCV程序:

这是代码.不要犹豫，评论任何您不了解的内容:

Full OpenCV program:

Here is the code. Do not hesitate to comment anything you wouldn't understand:

'''
Created on Apr 3, 2016

@author: Bill BEGUERADJ
'''
import cv2
import numpy as np 

drawing=False # true if mouse is pressed
mode=True # if True, draw rectangle. Press 'm' to toggle to curve

# mouse callback function
def begueradj_draw(event,former_x,former_y,flags,param):
    global current_former_x,current_former_y,drawing, mode

    if event==cv2.EVENT_LBUTTONDOWN:
        drawing=True
        current_former_x,current_former_y=former_x,former_y

    elif event==cv2.EVENT_MOUSEMOVE:
        if drawing==True:
            if mode==True:
                cv2.line(im,(current_former_x,current_former_y),(former_x,former_y),(0,0,255),5)
                current_former_x = former_x
                current_former_y = former_y
                #print former_x,former_y
    elif event==cv2.EVENT_LBUTTONUP:
        drawing=False
        if mode==True:
            cv2.line(im,(current_former_x,current_former_y),(former_x,former_y),(0,0,255),5)
            current_former_x = former_x
            current_former_y = former_y
    return former_x,former_y    



im = cv2.imread("darwin.jpg")
cv2.namedWindow("Bill BEGUERADJ OpenCV")
cv2.setMouseCallback('Bill BEGUERADJ OpenCV',begueradj_draw)
while(1):
    cv2.imshow('Bill BEGUERADJ OpenCV',im)
    k=cv2.waitKey(1)&0xFF
    if k==27:
        break
cv2.destroyAllWindows()

演示:

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