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import cv2 as cv
import numpy as np
def get_unit_similarity(a_4, b_4, k):
result = 0
for i in range(4):
result = result + (abs(int(a_4[i]) - int(b_4[i]))) ** k
result = result ** (1/k)
return int(result)
def input_flag(flag, x, y, similarity):
for i in range(4):
if flag[x][y][i] == 0:
flag[x][y][i] = similarity
break
return flag
def get_channels_similarity(channel, k, rank):
row, col = channel.shape
flag = np.zeros((row - 1, col - 1, 4))
result = np.zeros((row - 1, col - 1))
for i in range(row - 2):
for j in range(col - 2):
array = [channel[i][j], channel[i][j + 1], channel[i + 1][j + 1], channel[i + 1][j]]
r_array = [channel[i][j + 1], channel[i + 1][j + 1], channel[i][j + 2], channel[i + 1][j + 2]]
d_array = [channel[i + 1][j + 1], channel[i + 1][j], channel[i + 2][j + 1], channel[i + 2][j]]
r_similarity = get_unit_similarity(array, r_array, k)
d_similarity = get_unit_similarity(array, d_array, k)
flag = input_flag(flag, i, j, r_similarity)
flag = input_flag(flag, i, j, d_similarity)
flag = input_flag(flag, i+1, j, r_similarity)
flag = input_flag(flag, i, j+1, d_similarity)
for i in range(row-2):
for j in range(col-2):
flag4 = sorted(flag[i][j])
result[i][j] = flag4[4-rank]
return result
def get_qufendu(array):
return int(max(array)) - int(min(array))
def get_channels_qufendu(channel):
row, col = channel.shape
result = np.zeros((row - 1, col - 1))
for i in range(row-1):
for j in range(col-1):
array = [channel[i][j], channel[i][j + 1], channel[i + 1][j + 1], channel[i + 1][j]]
qufendu = get_qufendu(array)
result[i][j] = qufendu
return result
def mark(channel, similarity, qufendu):
row, col = similarity.shape
for i in range(row):
for j in range(col):
if similarity[i][j] > 50 and qufendu[i][j] > 20:
channel[i][j] = 0
else:
channel[i][j] = 255
return channel
def mark_similarity(img, k, rank):
p = cv.imread(img, 1)
b, g, r = cv.split(p)
b_similarity = get_channels_similarity(b, k, rank)
b_qufendu = get_channels_qufendu(b)
b = mark(b, b_similarity, b_qufendu)
g_similarity = get_channels_similarity(g, k, rank)
g_qufendu = get_channels_qufendu(g)
g = mark(g, g_similarity, g_qufendu)
r_similarity = get_channels_similarity(r, k, rank)
r_qufendu = get_channels_qufendu(r)
r = mark(r, r_similarity, r_qufendu)
p = cv.merge((b, g, r))
cv.imwrite(img[0:-4] + '_mark.png', p)
if __name__ == '__main__':
img_addr = '8068.jpg'
mark_similarity(img_addr, 1, 1)
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