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  • 4-4 算法优化

    # 1 灰度 最重要 2 基础 3 实时性
    # 定点-》浮点 +- */ >>
    # r*0.299+g*0.587+b*0.114
    
    import cv2
    import numpy as np
    img = cv2.imread('image0.jpg',1)
    imgInfo = img.shape
    height = imgInfo[0]
    width = imgInfo[1]
    # RGB R=G=B = gray (R+G+B)/3
    dst = np.zeros((height,width,3),np.uint8)
    for i in range(0,height):
        for j in range(0,width):
            (b,g,r) = img[i,j]
             # 浮点转定点
            b = int(b)
            g = int(g)
            r = int(r)
            gray = (r*1+g*2+b*1)/4
             #gray = (int(b)+int(g)+int(r))/3
            dst[i,j] = np.uint8(gray)
    cv2.imshow('dst',dst)
    cv2.waitKey(0)

    # 1 灰度 最重要 2 基础 3 实时性
    # 定点-》浮点 +- */ >>
    # r*0.299+g*0.587+b*0.114
    
    import cv2
    import numpy as np
    img = cv2.imread('image0.jpg',1)
    imgInfo = img.shape
    height = imgInfo[0]
    width = imgInfo[1]
    # RGB R=G=B = gray (R+G+B)/3
    dst = np.zeros((height,width,3),np.uint8)
    for i in range(0,height):
        for j in range(0,width):
            (b,g,r) = img[i,j]
             # 浮点转定点
            b = int(b)
            g = int(g)
            r = int(r)
            #gray = (r*1+g*2+b*1)/4
            gray = (int(b)+int(g)+int(r))/3
            dst[i,j] = np.uint8(gray)
    cv2.imshow('dst',dst)
    cv2.waitKey(0)

    # 1 灰度 最重要 2 基础 3 实时性
    # 定点-》浮点 +- */ >>
    # r*0.299+g*0.587+b*0.114
    
    import cv2
    import numpy as np
    img = cv2.imread('image0.jpg',1)
    imgInfo = img.shape
    height = imgInfo[0]
    width = imgInfo[1]
    # RGB R=G=B = gray (R+G+B)/3
    dst = np.zeros((height,width,3),np.uint8)
    for i in range(0,height):
        for j in range(0,width):
            (b,g,r) = img[i,j]
             # 浮点转定点
            b = int(b)
            g = int(g)
            r = int(r)
            #gray = (r*1+g*2+b*1)/4
            # 定点转移位
            gray = (r+(g<<1)+b)>>2
            #gray = (int(b)+int(g)+int(r))/3
            dst[i,j] = np.uint8(gray)
    cv2.imshow('dst',dst)
    cv2.waitKey(0)
    # 1 灰度 最重要 2 基础 3 实时性
    # 定点-》浮点 +- */ >>
    # r*0.299+g*0.587+b*0.114
    # 100 1000 10000
    import cv2
    import numpy as np
    img = cv2.imread('image0.jpg',1)
    imgInfo = img.shape
    height = imgInfo[0]
    width = imgInfo[1]
    # RGB R=G=B = gray (R+G+B)/3
    dst = np.zeros((height,width,3),np.uint8)
    for i in range(0,height):
        for j in range(0,width):
            (b,g,r) = img[i,j]
             # 浮点转定点
            b = int(b)
            g = int(g)
            r = int(r)
            #gray = (r*1+g*2+b*1)/4
            # 定点转移位
            gray = (r+(g<<1)+b)>>2
            #gray = (int(b)+int(g)+int(r))/3
            dst[i,j] = np.uint8(gray)
    cv2.imshow('dst',dst)
    cv2.waitKey(0)
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  • 原文地址:https://www.cnblogs.com/ZHONGZHENHUA/p/9689171.html
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