我正在尝试执行处理 70 张图像并提取定向梯度直方图 (HOG) 特征的代码。这些被传递给分类器 (Scikit-Learn)。
但是,出现了一个错误:
hog_image = hog_image_rescaled.resize((200, 200), Image.ANTIALIAS)
TypeError: an integer is required
我不明白为什么,因为尝试使用单个图像可以正常工作。
#Hog Feature
from skimage.feature import hog
from skimage import data, color, exposure
import cv2
import matplotlib.pyplot as plt
from PIL import Image
import os
import glob
import numpy as np
from numpy import array
listagrigie = []
path = 'img/'
for infile in glob.glob( os.path.join(path, '*.jpg') ):
print("current file is: " + infile )
colorato = Image.open(infile)
greyscale = colorato.convert('1')
#hog feature
fd, hog_image = hog(greyscale, orientations=8, pixels_per_cell=(16, 16),
cells_per_block=(1, 1), visualise=True)
plt.figure(figsize=(8, 4))
print(type(fd))
plt.subplot(121).set_axis_off()
plt.imshow(grigiscala, cmap=plt.cm.gray)
plt.title('Input image')
# Rescale histogram for better display
hog_image_rescaled = exposure.rescale_intensity(hog_image, in_range=(0, 0.02))
print("hog 1 immagine shape")
print(hog_image_rescaled.shape)
hog_image = hog_image_rescaled.resize((200, 200), Image.ANTIALIAS)
listagrigie.append(hog_image)
target.append(i)
print("ARRAY of gray matrices")
print(len(listagrigie))
grigiume = np.dstack(listagrigie)
print(grigiume.shape)
grigiume = np.rollaxis(grigiume, -1)
print(grigiume.shape)
from sklearn import svm, metrics
n_samples = len(listagrigie)
data = grigiume.reshape((n_samples, -1))
# Create a classifier: a support vector classifier
classifier = svm.SVC(gamma=0.001)
# We learn the digits on the first half of the digits
classifier.fit(data[:n_samples / 2], target[:n_samples / 2])
# Now predict the value of the digit on the second half:
expected = target[n_samples / 2:]
predicted = classifier.predict(data[n_samples / 2:])
print("expected")
print("predicted")
最佳答案
您应该将源图像(在您的示例中名为 colorato
)重新缩放为 (200, 200)
,然后提取 HOG 特征,然后传递 列表>fd
向量到您的机器学习模型。 hog_image
只是为了以用户友好的方式可视化特征描述符。实际特征在 fd
变量中返回。
关于python - 调整 Scikit-Learn 分类器的 HOG 特征,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/14173128/