一 OpenCV GUI特性

安裝Opencv

pip install --upgrade setuptools
pip install numpy Matplotlib
pip install opencv-python

　　opencv環境已經整好，就是這麼簡單。只須要numpy、Matplotlib、opencv-python三個包，都不大很快就能夠下好，若是下載中間出現error或wrong，從新輸入命令便可。

 

參考 OpenCv官方教材文檔

1.http://opencv-python-tutroals.readthedocs.io/en/latest/py_tutorials/py_gui/py_table_of_contents_gui/py_table_of_contents_gui.html#

 一 Dome

1.圖片

##01打開顯示一張圖片,顯示灰度圖片

import numpy as np import cv2 as cv ##01打開顯示一張圖片,顯示灰度圖片 img = cv.imread('E:\\fruits.jpg',0);#讀取一張圖片,注意路徑須要轉義,第二個參數是模式 cv.imwrite('E:\\fruits_copy.jpg',img);#寫一張圖片 cv.namedWindow('IMG_NAME',cv.WINDOW_NORMAL);#定義一個窗口 cv.imshow('IMG_NAME',img);#顯示窗口圖片 cv.waitKey(0);#等待響應 cv.destroyAllWindows();#銷燬窗體

 

##02使用matplotlib顯示座標畫圖

import numpy as np import cv2 as cv from matplotlib import pyplot as plt ##02使用matplotlib顯示座標畫圖 img = cv.imread('E:\\fruits.jpg',0) plt.imshow(img,cmap = 'gray',interpolation = 'bicubic')# ##plt.xticks([]),plt.yticks([])#x/y軸座標隱藏，去掉就顯示 plt.show()

2.視頻

##攝像頭顯示一幀幀圖片

import numpy as np import cv2 as cv #01內置攝像頭打開 cap = cv.VideoCapture(0) while(True):     ret,frame = cap.read()#     gray = cv.cvtColor(frame,cv.COLOR_BGR2GRAY)     cv.imshow('frame',gray)     if cv.waitKey(1) & 0xff == ord('q'):         break cap.release() cv.destroyAllWindows()

##處理後保存攝像頭視頻

##flip水平或者垂直翻轉數組

import numpy as np import cv2 #打開攝像頭 cap = cv2.VideoCapture(0)   #定義編碼器和寫對象 fourcc = cv.cv.FOURCC(*'XVID') out = cv.VideoWriter('E:\\output.avi',fourcc,20.0,(640,480)) #讀取攝像頭的一幀 while cap.isOpened():     ret,frame = cap.read()     if ret == True:         #翻轉圖片         frame = cv.flip(frame,0)         #寫出         out.write(frame)         cv.imshow('frmae',frame)         #中斷判斷         if cv.waitKey(1) & 0xff == ord('q'):             break     else:         break #釋放內存/資源 cap.release() out.release() cv.destroyAllWindows()

 

3.繪畫

主要函數：線：cv2.line()  圓 cv2.circle() 矩陣 cv2.rectangle() 橢圓 cv2.ellipse() 文字 cv2.putText()

函數的參數：img,color,thickness,linetype

·##簡單繪畫

import numpy as np import cv2 as cv #設置一張背景圖片 img = np.zeros((512,512,3),np.uint8) ##img = cv.imread('E:\\fruits.jpg',0);   cv.line(img,(0,0),(511,511),(255,0,0),5)#畫線 cv.circle(img,(477,263),63,(0,0,255),8,8)#畫圓 cv.rectangle(img,(384,0),(510,128),(0,255,0),3)#矩陣 cv.ellipse(img,(256,256),(100,50),0,0,360,255,-1)#橢圓 font = cv.FONT_HERSHEY_SIMPLEX cv.putText(img,'helloworld',(10,500),font,4,(255,255,255),2)   ##pts = np.array([[10,5],[20,30],[70,20],[50,10]],np.int32)#連點多邊形，能夠經過多條line鏈接造成 ##pts = pts.reshape(-1,1,2)   #顯示 cv.namedWindow('IMG_NAME',cv.WINDOW_NORMAL);#定義一個窗口 cv.imshow('IMG_NAME',img);#顯示窗口圖片 cv.waitKey(0);#等待響應 cv.destroyAllWindows();#銷燬窗體

·##增強繪畫：左擊畫圓

import cv2 as cv import numpy as np #鼠標響應函數   def draw_circle(event,x,y,flags,param):     if event == cv.EVENT_LBUTTONDBLCLK:#左擊         cv.circle(img,(x,y),63,(0,0,255),8,8)#畫圓 #窗體及顯示 img = np.zeros((512,512,3),np.uint8) cv.namedWindow('IMG_NAME');#定義一個窗口 cv.setMouseCallback('IMG_NAME',draw_circle) #重繪刷新 while(1):     cv.imshow('IMG_NAME',img)     if cv.waitKey(20) & 0xff == 27:#ESC退出         break   #顯示   cv.waitKey(0);#等待響應 cv.destroyAllWindows();#銷燬窗體

·##增強繪畫：拖動畫圖

import numpy as np import cv2 as cv drawing = False mode = 'a' ix,iy =-1,-1 #建立回調函數 def draw_circle(event,x,y,flags,params):     global ix,iy,drawing,mode     #左擊，返回起始位置     if event == cv.EVENT_LBUTTONDOWN:         drawing = True         ix,iy = x,y     elif event == cv.EVENT_MOUSEMOVE and flags == cv.EVENT_FLAG_LBUTTON:         if drawing == True:             if mode == 'a':#畫線                 cv.rectangle(img,(x,y),(x,y),(0,255,0),-1)             elif mode == 'b':#畫圓                 cv.circle(img,(x,y),6,(0,255,0),-1)     elif event == cv.EVENT_LBUTTONUP:             drawing =False ##           img=np.zeros((512,512,3),np.uint8) cv.namedWindow('image') cv.setMouseCallback('image',draw_circle) ##刷新重繪 while(1):     cv.imshow('image',img)     k=cv.waitKey(1)&0xFF     if k==ord('a'):         mode='a'     elif k==ord('b'):         mode='b'     elif k==27:         break

·##增強畫圖：調色板

import numpy as np import cv2 as cv # def nothing(x):     pass # img = np.zeros((300,512,3),np.uint8) cv.namedWindow('image') cv.createTrackbar('R','image',0,255,nothing) cv.createTrackbar('G','image',0,255,nothing) cv.createTrackbar('B','image',0,255,nothing)   switch = '0:OFF\n1:ON' cv.createTrackbar(switch,'image',0,1,nothing) while(1):     cv.imshow('image',img)     k = cv.waitKey(1)&0xff     if k == 27 :         break     r = cv.getTrackbarPos('R','image')     g = cv.getTrackbarPos('G','image')     b = cv.getTrackbarPos('B','image')     s = cv.getTrackbarPos(switch,'image')     if s == 0:         img[:]=0     else:         img[:]=[b,g,r] cv.destroyAllWindows()

 

·##上述兩種功能結合在一塊兒，可調色的畫板

import numpy as np import cv2 as cv drawing = False mode = 'a' ix,iy =-1,-1 #建立回調函數 def draw_circle(event,x,y,flags,params):     global ix,iy,drawing,mode     #獲取顏色值     r = cv.getTrackbarPos('R','image')     g = cv.getTrackbarPos('G','image')     b = cv.getTrackbarPos('B','image')     color = [r,g,b]       #左擊，返回起始位置     if event == cv.EVENT_LBUTTONDOWN:         drawing = True         ix,iy = x,y     elif event == cv.EVENT_MOUSEMOVE and flags == cv.EVENT_FLAG_LBUTTON:         if drawing == True:             if mode == 'a':#畫線                 cv.rectangle(img,(x,y),(x,y),color,-1)             elif mode == 'b':#畫圓                 cv.circle(img,(x,y),6,color,-1)     elif event == cv.EVENT_LBUTTONUP:             drawing =False ##    def nothing(x):pass   img=np.zeros((512,512,3),np.uint8) cv.namedWindow('image')   #選擇顏色 cv.createTrackbar('R','image',0,255,nothing) cv.createTrackbar('G','image',0,255,nothing) cv.createTrackbar('B','image',0,255,nothing)     cv.setMouseCallback('image',draw_circle) ##刷新重繪 while(1):     cv.imshow('image',img)     k=cv.waitKey(1)&0xFF     if k==ord('a'):         mode='a'     elif k==ord('b'):         mode='b'     elif k==27:         break

 

 

二 API 使用說明

參考http://opencv.jp/opencv-2.2_org/py/index.html