1.图像模糊处理

import?cv2?as?cv;
def?blur_demo():
????src=cv.imread("F:/images/zwj.jpg")
????cv.imshow("test",src)
????dst=cv.blur(src,?(15,15))
????cv.imshow("blur",dst);
????
if?__name__=="__main__":
????blur_demo()
????cv.waitKey(0);
????cv.destroyWindow()

2.均值和高斯模糊

#?-*-?coding:?utf-8?-*-
"""
Created?on?Sat?Oct?24?19:12:29?2020

@author:?zwj
@email:2377389590@qq测试数据
"""
import?cv2?as?cv
import?numpy?as?np
def?blur_demo():
????src=cv.imread("F:/images/zwj.jpg")
????cv.imshow("input",src)
????dst=cv.blur(src,(15,15))
????cv.imshow("blur",dst);

def?gaussian_blur_demo():
????src=cv.imread("F:/images/zwj.jpg")
????cv.imshow("input",?src)
????dst=cv.GaussianBlur(src,?(5,5),?0)
????cv.imshow("gaussian_blur",?dst)

if?__name__=="__main__":
????blur_demo()
????gaussian_blur_demo()
????cv.waitKey(0)
????cv.destroyAllWindows()

3、统计滤波（最大、最小、中值滤波）

#?-*-?coding:?utf-8?-*-
"""
Created?on?Sun?Oct?25?00:09:04?2020

@author:?猪猪侠
@email:2377389590@qq测试数据
"""
import?cv2?as?cv
import?tensorflow?as?tf
import?numpy?as?np
def?statistics_filters():
????src=cv.imread("F:/images/jy.png")
????cv.imshow("input",src)
????
????kernel=np.ones((3,3),np.uint8)
????dst=cv.erode(src,kernel)
????cv.imshow("minmum",dst)
????
????dst2=cv.dilate(src,?kernel)
????cv.imshow("maxmum",?dst2)
????
????dst1=cv.medianBlur(src,?5)
????cv.imshow("medi",dst1)

if?__name__=="__main__":
????statistics_filters()
????cv.waitKey(0)
????cv.destroyAllWindows()

4、椒盐噪声and?高斯噪声

#?-*-?coding:?utf-8?-*-
"""
Created?on?Sun?Oct?25?00:09:04?2020

@author:?猪猪侠
@email:2377389590@qq测试数据
"""


import?cv2?as?cv
import?numpy?as?np
def?add_noise():
????src=cv.imread("F:/images/zwj.jpg")
????cv.imshow("input",src)
????copy=np.copy(src)
????
????nums=50000
????h,w=src.shape[:2]
????rows=np.random.randint(0,h,(nums),dtype=np.int)
????cols=np.random.randint(0,w,(nums),dtype=np.int)
????for?i?in?range(nums):
????????if?i%2==1:
????????????src[rows[i],cols[i]]=(255,255,255)
????????else:
????????????src[rows[i],cols[i]]=(0,0,0)
????cv.imshow("salt?ans?papper?image",?src)
????gnoise=np.zeros(src.shape,src.dtype)
????m=(15,15,15)
????s=(30,30,30)
????cv.randn(gnoise,m,?s)
????cv.imshow("gnoise",?gnoise)
????dst=cv.add(copy,gnoise)
????cv.imshow("gaussian?noise",?dst)
if?__name__=="__main__":
????#blur_demo()
????#gaussian_blur_demo()
????#?statistics_filters()
????add_noise()
????cv.waitKey(0)
????cv.destroyAllWindows()

5、素描图像

#?-*-?coding:?utf-8?-*-
"""
Created?on?Mon?Oct?26?00:33:30?2020

@author:?猪猪侠
@email:2377389590@qq测试数据
"""

import?cv2?as?cv
import?numpy?as?np

src=cv.imread("F:/images/zwj.jpg")
cv.imshow("input",src)
gray?=?cv.cvtColor(src,?cv.COLOR_BGR2GRAY)
cv.imshow("gray",?gray)
ksize=15
sigma=10
inv?=?255?-?gray
blur?=?cv.GaussianBlur(inv,?ksize=(ksize,?ksize),?sigmaX=sigma,?sigmaY=sigma)
res?=?cv.divide(gray,?255?-?blur,?scale=255)
cv.imshow("sumiao",?res)
mask=np.ones_like(src,np.uint8)

#?mask[:,mask.shape[1]//2:,:]=0
mask[:,:mask.shape[1]//2:,:]=0
#mask[mask.shape[1]//2:,:,:]=0
#mask[:mask.shape[1]//2,:,:]=0
res?=?np.expand_dims(res,axis?=?2)
img=res*mask+src*(1-mask)
cv.imshow("mask",img)
cv.waitKey(0)
cv.destroyAllWindows()

6、绘制素描视频

import?cv2?as?cv
import?numpy?as?np

cap?=?cv.VideoCapture('D:/Img/蔡徐坤.mp4')
while?(cap.isOpened()):
????ret,?frame?=?cap.read()
????gray?=?cv.cvtColor(frame,?cv.COLOR_BGR2GRAY)
????cv.imshow("gray",?gray)
????ksize?=?15
????sigma?=?10
????inv?=?255?-?gray
????blur?=?cv.GaussianBlur(inv,?ksize=(ksize,?ksize),?sigmaX=sigma,?sigmaY=sigma)
????res?=?cv.divide(gray,?255?-?blur,?scale=255)
????cv.imshow("sumiao",?res)
????mask?=?np.ones_like(frame,?np.uint8)
????h,?w?=?frame.shape[:2]
????mask[0:h//2,w//2:,:]=0
????mask[h//2:,0:w//2,:]=0
????#?mask[:,w//2:,:]=0
????#?mask[:,?:w?//?2:,?:]?=?0
????#mask[h//2:,:,:]=0
????#?mask[:h//2,:,:]=0
????res?=?np.expand_dims(res,?axis=2)
????img?=?res?*?mask?+?frame?*?(1?-?mask)
????cv.imshow("mask",?img)
????if?cv.waitKey(25)?&?0xFF?==?ord('q'):
????????break
cap.release()
cv.destroyAllWindows()

7、模版匹配

import?cv2?as?cv
import??numpy?as?np
def?match_template():
????src=cv.imread("F:/images/zwj.jpg")
????tpl=cv.imread("F:/images/zwj2.jpg")

????cv.imshow("input",src)
????cv.imshow("tpl",tpl)

????th,tw=tpl.shape[:2]

????result=cv.matchTemplate(src,tpl,cv.TM_CCORR_NORMED)
????cv.imshow("result",result)
????minv,maxv,min_loc,max_loc=cv.minMaxLoc(result)
????cv.rectangle(src,max_loc,(max_loc[0]+tw,max_loc[1]+th),(0,0,255),2,8,0)
????cv.imshow("dst",src)

if?__name__=="__main__":
????match_template()
????cv.waitKey(0)
????cv.destroyWindow();

8、Python调用摄像头

import?cv2?as?cv
cap=cv.VideoCapture(0)
while(True):
????ret,frame=cap.read()
????gray=cv.cvtColor(frame,cv.COLOR_RGB2BGR)
????cv.imshow("gray",gray)
????if?cv.waitKey(1)&0xFF==ord('1'):
????????break
cap.release()
cv.destroyWindow()

9、鼠标监听：

import?cv2?as?cv
import?numpy?as?np
def?my_mouse_callback(event,x,y,flag,params):
????if?event==cv.EVENT_LBUTTONDOWN:
????????b=np.random.randint(0,256)
????????g=np.random.randint(0,256)
????????r=np.random.randint(0,256)
????????cv.circle(params,(x,y),50,(b,g,r),2,cv.LINE_8,0)
????if?event==cv.EVENT_LBUTTONDOWN:
????????x1?=?np.random.rand()?*?600
????????y1?=?np.random.rand()?*?600
????????x2?=?np.random.rand()?*?600
????????y2?=?np.random.rand()?*?600
????????b?=?np.random.randint(0,?256)
????????g?=?np.random.randint(0,?256)
????????r?=?np.random.randint(0,?256)
????????cv.line(params,?(np.int(x1),?np.int(y1)),?(np.int(x2),?np.int(y2)),?(b,?g,?r),?4,?cv.LINE_8,?0)
def?mouse_demo():
????src=np.zeros((512,512,3),dtype=np.uint8)
????cv.namedWindow("mouse_demo",cv.WINDOW_AUTOSIZE)
????cv.setMouseCallback("mouse_demo",my_mouse_callback,src)
????while(True):
????????cv.imshow("mouse_demo",src)
????????c=cv.waitKey(20)
????????if?c==27:
????????????break
????????#?cv.imshow("src",src)
if?__name__=="__main__":
????mouse_demo()
????cv.waitKey(0)
????cv.destroyAllWindows()

?

10、滑动块：

import?cv2?as?cv
import?numpy?as?np
def?do_nothing(pl):
????pass

def?track_bar_demo():
????src=np.zeros((512,512,3),dtype=np.uint8)
????cv.namedWindow("tb_demo",cv.WINDOW_AUTOSIZE)
????cv.createTrackbar("B","tb_demo",0,255,do_nothing)
????cv.createTrackbar("G","tb_demo",0,255,do_nothing)
????cv.createTrackbar("R","tb_demo",0,255,do_nothing)
????while(True):
????????b=cv.getTrackbarPos("B","tb_demo")
????????g?=?cv.getTrackbarPos("G",?"tb_demo")
????????r?=?cv.getTrackbarPos("R",?"tb_demo")
????????src[:]=[b,g,r]
????????cv.imshow("tb_demo",src)
????????c=cv.waitKey(15)
????????if?c==27:
????????????break
if?__name__=="__main__":
????track_bar_demo()
????cv.waitKey(0)
????cv.destroyAllWindows()

?

10、绘制直方图

import?cv2?as?cv
from?matplotlib?import??pyplot?as?plt
img=cv.imread("D:/images/myj.jpg")
cv.imshow('input',img)
color=('b','g','r')
for?i,col?in?enumerate(color):
????histr=cv.calcHist([img],[i],None,[256],[0,256])
????plt.plot(histr,color=col)
plt.show()
cv.waitKey(0)
cv.destroyAllWindows()

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