OpenCV学习

import cv2
import numpy as np

img = np.zeros((500,500,3),np.uint8)

#画直线
cv2.line(img,(0,250),(250,400),(233,233,233),2)
"""
def line(img, pt1, pt2, color, thickness=None, lineType=None, shift=None):
        @param img Image.
    .   @param pt1 First point of the line segment.
    .   @param pt2 Second point of the line segment.
    .   @param color Line color.
    .   @param thickness Line thickness.
    
"""

cv2.imshow("img",img)
cv2.waitKey(0)
cv2.destroyAllWindows()

# 任意多边形
rect = np.array([[[200,200],[300,400],[100,400],[300,250]]],np.int32)
cv2.fillPoly(img,rect,(233,43,0))   # 可以填充
cv2.polylines(img,rect,1,(233,43,0))  # 无法填充
cv2.imshow('renyiduobianxing',img)

import cv2
import numpy as np

img = np.zeros((500,500,3),np.uint8)
cv2.circle(img,(255,255),100,(21,123,0),-1)
cv2.circle(img,(100,100),100,(32,43,232),2,shift = 1)
cv2.imshow('circle',img)
cv2.waitKey()
cv2.destroyAllWindows()

#画矩形

import cv2
import numpy as np

img = np.zeros((500,500,3),np.uint8)
cv2.rectangle(img,(100,100),(300,300),(100,100,100))

cv2.imshow('rectangel',img)
cv2.waitKey()
cv2.destroyAllWindows()
"""

def rectangle(img, pt1, pt2, color, thickness=None, lineType=None, shift=None)
    .   @param img Image.
    .   @param pt1 Vertex of the rectangle.
    .   @param pt2 Vertex of the rectangle opposite to pt1 .
    .   @param color Rectangle color or brightness (grayscale image).
    .   @param thickness Thickness of lines that make up the rectangle. Negative values, like #FILLED,
    .   mean that the function has to draw a filled rectangle.
    .   @param lineType Type of the line. See #LineTypes
    .   @param shift Number of fractional bits in the point coordinates.

"""

ellipse（）

import cv2
import numpy as np

img = np.zeros((500,500,3),np.uint8)
cv2.ellipse(img,(250,250),(50,30),0,0,360,(100,200,200),2)
"""
def ellipse(img, center, axes, angle, startAngle, endAngle, color, thickness=None, lineType=None, shift=None)
        @param img Image.
    .   @param center Center of the ellipse.
    .   @param axes Half of the size of the ellipse main axes.
    .   @param angle Ellipse rotation angle in degrees.
    .   @param startAngle Starting angle of the elliptic arc in degrees.
    .   @param endAngle Ending angle of the elliptic arc in degrees.
    .   @param color Ellipse color.
    .   @param thickness Thickness of the ellipse arc outline, if positive. Otherwise, this indicates that
    .   a filled ellipse sector is to be drawn.
    .   @param lineType Type of the ellipse boundary. See #LineTypes
    .   @param shift Number of fractional bits in the coordinates of the center and values of axes.
"""

cv2.imshow('ellipse',img)
cv2.waitKey()
cv2.destroyAllWindows()

import cv2
import numpy as np

img = np.zeros((500,500,3),np.uint8)
cv2.putText(img,"hello OPENCV",(100,100),cv2.FONT_HERSHEY_SIMPLEX,1,(233,233,233))
"""
def putText(img, text, org, fontFace, fontScale, color, thickness=None, lineType=None, bottomLeftOrigin=None):
        @param img Image.
    .   @param text Text string to be drawn.
    .   @param org Bottom-left corner of the text string in the image.
    .   @param fontFace Font type, see #HersheyFonts.
    .   @param fontScale Font scale factor that is multiplied by the font-specific base size.
    .   @param color Text color.
    .   @param thickness Thickness of the lines used to draw a text.
    .   @param lineType Line type. See #LineTypes
    .   @param bottomLeftOrigin When true, the image data origin is at the bottom-left corner. Otherwise,
    .   it is at the top-left corner.

"""
cv2.imshow('text',img)
cv2.waitKey()
cv2.destroyAllWindows()