pip install matplotlib
1简单的阈值化
cv2.threshold第一个参数是源图像，它应该是灰度图像. 第二个参数是用于对像素值进行分类的阈值, 第三个参数是maxVal，它表示如果像素值大于(有时小于)阈值则要给出的值. OpenCV提供不同类型的阈值，它由函数的第四个参数决定. 不同的类型是：
cv2.THRESH_BINARY
如果 src(x,y)>threshold ,dst(x,y) = max_value; 否则,dst(x,y)=0
cv.THRESH_BINARY_INV
如果 src(x,y)>threshold,dst(x,y) = 0; 否则,dst(x,y) = max_value
cv.THRESH_TRUNC
如果 src(x,y)>threshold，dst(x,y) = max_value; 否则dst(x,y) = src(x,y)
cv.THRESH_TOZERO
如果src(x,y)>threshold，dst(x,y) = src(x,y) ; 否则 dst(x,y) = 0
cv.THRESH_TOZERO_INV
如果 src(x,y)>threshold，dst(x,y) = 0 ; 否则dst(x,y) = src(x,y)
代码
importcv2importnumpy as npimportmatplotlib.pylab as plt
img= cv2.imread('lena.jpg',0)
ret,thresh1= cv2.threshold(img,127,255,cv2.THRESH_BINARY)
ret,thresh2= cv2.threshold(img,127,255,cv2.THRESH_BINARY_INV)
ret,thresh3= cv2.threshold(img,127,255,cv2.THRESH_TRUNC)
ret,thresh4= cv2.threshold(img,127,255,cv2.THRESH_TOZERO)
ret,thresh5= cv2.threshold(img,127,255,cv2.THRESH_TOZERO_INV)
titles= ['Original Image','BINARY','BINARY_INV','TRUNC','TOZERO','TOZERO_INV']
images=[img, thresh1, thresh2, thresh3, thresh4, thresh5]for i in range(6):
plt.subplot(2,3,i+1),plt.imshow(images[i],'gray')
plt.title(titles[i])
plt.xticks([]),plt.yticks([])
plt.show()
测试效果
2自适应阈值化
图像在不同区域具有不同照明条件时，应进行自适应阈值处理.因此，我们为同一图像的不同区域获得不同的阈值，并且它为具有不同照明的图像提供了更好的结果.
cv2.adaptiveThreshold(src, maxValue, adaptiveMethod, thresholdType, blockSize, C[, dst])
adaptiveMethod:决定如何计算阈值
cv2.ADAPTIVE_THRESH_MEAN_C:阈值是邻域的平均值
cv2.ADAPTIVE_THRESH_GAUSSIAN_C:阈值是邻域值的加权和，其中权重是高斯窗口
blockSize:决定了邻域的大小
C:从计算的平均值或加权平均值中减去的常数
importcv2importnumpy as npimportmatplotlib.pylab as plt
img= cv2.imread('lena.jpg',0)
img= cv2.medianBlur(img,5)
ret,th1= cv2.threshold(img,127,255,cv2.THRESH_BINARY)
th2= cv2.adaptiveThreshold(img,255,cv2.ADAPTIVE_THRESH_MEAN_C,\
cv2.THRESH_BINARY,11,2)
th3= cv2.adaptiveThreshold(img,255,cv2.ADAPTIVE_THRESH_GAUSSIAN_C,\
cv2.THRESH_BINARY,11,2)
titles= ['Original Image', 'Global Thresholding (v = 127)','Adaptive Mean Thresholding', 'Adaptive Gaussian Thresholding']
images=[img, th1, th2, th3]for i in range(4):
plt.subplot(2,2,i+1),plt.imshow(images[i],'gray')
plt.title(titles[i])
plt.xticks([]),plt.yticks([])
plt.show()
3 大津阈值法
根据双峰图像的图像直方图自动计算阈值。 (对于非双峰图像，二值化不准确。)
使用cv.threshold()但是传递了一个额外的标志v.THRESH_OTSU.对于阈值，只需传递零.然后算法找到最佳阈值并返回为第二个输出retVal。如果未使用Otsu阈值法，则retVal与之前使用的阈值相同.
在第一种情况下，将全局阈值应用为值127.在第二种情况下，直接应用了Otsu的阈值.在第三种情况下，使用5x5高斯内核过滤图像以消除噪声，然后应用Otsu阈值处理.
代码：
importcv2importnumpy as npimportmatplotlib.pylab as plt
img= cv2.imread('lena.jpg',0)#global thresholding
ret1,th1 = cv2.threshold(img,127,255,cv2.THRESH_BINARY)#Otsu's thresholding
ret2,th2 = cv2.threshold(img,0,255,cv2.THRESH_BINARY+cv2.THRESH_OTSU)#Otsu's thresholding after Gaussian filtering
blur = cv2.GaussianBlur(img,(5,5),0)
ret3,th3= cv2.threshold(blur,0,255,cv2.THRESH_BINARY+cv2.THRESH_OTSU)#plot all the images and their histograms
images =[img, 0, th1,
img, 0, th2,
blur, 0, th3]
titles= ['Original Noisy Image','Histogram','Global Thresholding (v=127)','Original Noisy Image','Histogram',"Otsu's Thresholding",'Gaussian filtered Image','Histogram',"Otsu's Thresholding"]for i in range(3):
plt.subplot(3,3,i*3+1),plt.imshow(images[i*3],'gray')
plt.title(titles[i*3]), plt.xticks([]), plt.yticks([])
plt.subplot(3,3,i*3+2),plt.hist(images[i*3].ravel(),256)
plt.title(titles[i*3+1]), plt.xticks([]), plt.yticks([])
plt.subplot(3,3,i*3+3),plt.imshow(images[i*3+2],'gray')
plt.title(titles[i*3+2]), plt.xticks([]), plt.yticks([])
plt.show()
)
