如何用python取图片轮廓

 

#coding:utf-8
from PIL import Image,ImageDraw

def isWhite(color):
    """
    查看像素是否为白色
    """
    """
    print color
    if type(color) == type(1):
        if color == 0:
            return False
        else:
            return True
    """
    if type(color) == type(1):
        light = color
    else:
        light = (color[0] + color[1] + color[2])/3

    if light < 150:
        return False

    return True

def getSharp(infile,outfile):
    """
    获取图片轮廓
    """
    img = Image.open(infile)
    data = img.getdata()

    outimg = Image.new("1",img.size)
    drawimg = ImageDraw.Draw(outimg)

    width,height = img.size
    cnt = 0
    for y in xrange(0,height):
        for x in xrange(0,width):
            drawimg.point((x,y),255)
            if isWhite(data[y * width + x]):
                continue
            if y == 0 or x == 0 or y == height - 1 or x == width - 1:
                continue
            if not isWhite(data[(y-1) * width + x]) and not isWhite(data[(y+1) * width +x]):
                if not isWhite(data[y * width + (x - 1)]) and not isWhite(data[y * width + x + 1]):
                    continue
            cnt += 1
            drawimg.point((x,y),0)

    outimg.save(outfile)
    print cnt

getSharp("076.jpg","2.bmp")