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def image_read_tf(imnames): images = tf.gfile.FastGFile(imnames,'rb').read() images = tf.image.decode_jpeg(images, channels=3) return imagesdef image_read_cv(imname): image = cv2...

import numpy as npimport tensorflow as tfa = np.random.rand(10000)print("random:",np.sum(a>0.5)/len(a))输出：random: 0.5025note: 根据概率知识，np.random.rand(num)的num要足够大才接近0.5。...

利用scipy.io读取.mat文件import scipy.io as ioio.loadmat('anno.mat')如果该mat文件是由高版本matlab创建的，可能会出现以下提示：Please use HDF reader for matlab v7.3 files此时该方法失效利用h5py读取.mat文件import h5pydata = h5py.File('./AF...

最近在做人脸检测，由于人脸可能是歪的，所以需要旋转的矩形框，使用math模块配合opencv完成。math.atan() 对于两点分别是为(x1,y1) 和(x2,y2)形成的直线，math.atan()可以求其斜率（反正切值）对应角度：angle = atan( (y2-y1)/(x2-x1) )math.atan2() 对于两点分别是为(x1,y1) 和(x2,y2)形成的直线，mat...

image_name = ''.join([chr(j) for j in data[data['anno'][0][i]]])chr(j)将值为j的ascii码变为字符，然后在for循环中得到字符列表，’’.join方法将这些字符拼接起来

demo代码：import numpy as npa = np.array([[1,2,3],[4,5,6],[7,8,9],[10,11,12]])print('1:')print(a[..., 0])print('2:')print(a[..., 1])print('3:')print(a[..., 2])print('4:')print(a[..., 0:1])prin...

demo代码：import numpy as npa = np.array([[1,2,3],[4,5,6],[7,8,9],[10,11,12]])b = np.float32([[1,2,3],[4,5,6],[7,8,9],[10,11,12]])print('1:')print(type(a))print('2:')print(type(b))print('3:')pri...