python实现准考证号填涂识别

python实现准考证号填涂识别

from PIL import Image
x_start = 12               # 起始点坐标
y_start = 92
fill_width   = 24          # 信息点宽度
fill_height  = 12          # 信息点高度
space_width  = 16          # 间隔宽度
space_height = 15          # 间隔高度
num_length = 9             # 准考证号长度

def bw_judge(R, G, B):     # bw_judge用于判断一个像素的填涂情况
    Gray_scale = 0.299 * R + 0.587 * G + 0.114 * B
    return Gray_scale < 132

def fill_judge(x, y):      # fill_judge用于判断信息点的填涂情况
    count = 0
    for i in range(x, x + fill_width + 1):
        for j in range(y, y + fill_height + 1):
            R, G, B = pixels[i, j]
            if bw_judge(R, G, B) == True:
                count = count + 1
    if count >= fill_width * fill_height * 0.64:
        return True

total_width  = fill_width + space_width
total_height = fill_height + space_height
image = Image.open("fill.bmp")
pixels = image.load()
number = ""

for col in range(num_length):         # x从左至右，y从上至下对填涂区进行检测
    for row in range(10):
        x = x_start + total_width  * col
        y = y_start + total_height * row
        if fill_judge(x, y) == True:
            number = number + str(row)
            break
    else:                            # 10个信息点检测完毕后未发现有填涂
        number = number + '#'
print(number)