去除图片浅色背景(PIL实现)
- Python
- 2017-10-30
- 158热度
- 0评论
基本思路:在二值化的基础上修改。首先灰度化,然后大于阈值的像素(浅色背景),设为255,小于阈值的像素,保留原样。阈值可以试出来,不同的图片,适合的阈值不一样。
源码:
from PIL import Image
def testImg(file,threshold):
loadpath = "./image/"
img = Image.open(loadpath+file)
img.show()
img = img.convert("L")
img.show()
img = binarizing(img, threshold)
img.show()
def binarizing(img,threshold): #input: gray image
pixdata = img.load()
w, h = img.size
for y in range(h):
for x in range(w):
if pixdata[x, y] < threshold:
pass
else:
pixdata[x, y] = 255
return img
if __name__ == "__main__":
fileList = ["GettingStarted.png", "Balance.png"]
for file in fileList:
testImg(file, 175)