NMS
非极大值抑制
def NMS(dects, threshold):
# dects:[x1,y1,x2,y2,score]
x1 = dects[:,0]
y1 = dects[:,1]
x2 = dects[:,2]
y2 = dects[:,3]
score = dects[:,4]
nboxs = dects.shape[0]
area = (x2-x1+1)*(y2-y1+1)
order = score.argsort()[::-1] #score从大到小排列的indexs,一维数组
result = []
suppressed = np.array([0]*nboxs)
for _i range(nboxs):
i = order[_i]
if suppressed[i] == 1:
continue
result.append(i)
for _j in range(_i+1, nboxs):
j = order[_j]
if supressed[j] == 1:
continue
xx1 = np.max(x1[i], x1[j])
yy1 = np.max(y1[i], y1[j])
xx2 = np.min(x2[i], x2[j])
yy2 = np.min(y2[i], y2[j])
w = np.max(0, xx2-xx1+1)
h = np.max(0, yy2-yy1+1)
interface = w*h
overlap = interface / (area[i]+area[j])
if overlap >= threshold:
supressed[j] = 1
return result
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