[英]How to identify non-photograph or 'uninteresting' images using Python Imaging Library (PIL)
I have thousands of images and I need to weed out the ones which are not photographs, or otherwise 'interesting'. 我有成千上万的图像,我需要清除那些不是照片或其他“有趣”的图像。
An 'uninteresting' image, for example, may be all one color, or mostly one color, or a simple icon/logo. 例如,“不感兴趣”的图像可以是所有一种颜色,或者主要是一种颜色,或简单的图标/徽标。
The solution doesn't have to be perfect, just good enough to remove the least interesting images. 解决方案不一定非常完美,只需要删除最不有趣的图像就足够了。
My best idea so far is to take a random sampling of pixels, and then... do something with them. 到目前为止,我最好的想法是对像素进行随机抽样,然后......用它们做点什么。
Danphe beat me to it. Danphe打败了我。 Here's my method for calculating image entropy: 这是我计算图像熵的方法:
import Image
from math import log
def get_histogram_dispersion(histogram):
log2 = lambda x:log(x)/log(2)
total = len(histogram)
counts = {}
for item in histogram:
counts.setdefault(item,0)
counts[item]+=1
ent = 0
for i in counts:
p = float(counts[i])/total
ent-=p*log2(p)
return -ent*log2(1/ent)
im = Image.open('test.png')
h = im.histogram()
print get_histogram_dispersion(h)
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