opencv中图像处理油画特效
import cv2
import numpy as np
import random
import math
img
= cv2.imread
(r
"C:\Users\lenovo\Desktop\python\python_vision\image.jpg",1
)
cv2.imshow
("img1",img
)
imgInfo
= img.shape
height
= imgInfo
[0
]
weight
= imgInfo
[1
]
gray
= cv2.cvtColor
(img,cv2.COLOR_RGB2GRAY
)
dst
= np.zeros
((height,weight,3
),np.uint8
)
for i
in range
(4,height-4
):
for j
in range
(4,weight-4
):
arry
= np.zeros
(8,np.uint8
)
for m
in range
(-4,4
):
for n
in range
(-4,4
):
p1
= int
(gray
[i+m,j+n
]/32
)
arry
[p1
] = arry
[p1
] + 1
currentMax
= arry
[0
]
l
= 0
for k
in range
(0,8
):
if currentMax
<arry
[k
]:
currentMax
= [k
]
l
= k
for m
in range
(-4,4
):
for n
in range
(-4,4
):
if gray
[i+m,j+n
] >=(l*32
) and gray
[i+m,j+n
] <= ((l+1
)*32
):
(b,g,r
) = img
[i+m,j+n
]
dst
[i,j
] = (b,g,r
)
cv2.imshow
("dst",dst
)
cv2.waitKey
()
油画特效的实现思路主要分以下五步：
1.将图片转换为灰色图片 2.将图片分割成小方块，例如77，1010等 3.将像素值划分成若干等级，例如划分成4个等级，则063为等级一，64127为等级二，128191为等级三，192255为等级四 4.将步骤2中每个小方块，计算其内各等级的像素点个数 5.使用统计出的平均值替换原像素值
