标签:__ cv2 image CV2 PyTorch self range inception 预处理
验证预处理一致性
import os
import cv2
import numpy as np
import PIL
import torch
from PIL import Image
import torchvision.transforms as transforms
class RGBToBGR():
def __call__(self, im):
assert im.mode == 'RGB'
r, g, b = [im.getchannel(i) for i in range(3)]
# RGB mode also for BGR, `3x8-bit pixels, true color`, see PIL doc
im = PIL.Image.merge('RGB', [b, g, r])
return im
class ScaleIntensities():
def __init__(self, in_range, out_range):
""" Scales intensities. For example [-1, 1] -> [0, 255]."""
self.in_range = in_range
self.out_range = out_range
def __oldcall__(self, tensor):
tensor.mul_(255)
return tensor
def __call__(self, tensor):
tensor = (
tensor - self.in_range[0]
) / (
self.in_range[1] - self.in_range[0]
) * (
self.out_range[1] - self.out_range[0]
) + self.out_range[0]
return tensor
def make_transform():
inception_sz_resize = 256
inception_sz_crop = 224
inception_mean = [104, 117, 128]
inception_std = [1, 1, 1]
inception_transform = transforms.Compose(
[
RGBToBGR(),
transforms.Resize(inception_sz_resize),
transforms.CenterCrop(inception_sz_crop),
transforms.ToTensor(),
ScaleIntensities([0, 1], [0, 255]),
transforms.Normalize(mean=inception_mean, std=inception_std)
])
return inception_transform
def cv2_transform(image):
inception_sz_resize = 256
inception_sz_crop = 224
inception_mean = [104, 117, 128]
inception_std = [1, 1, 1]
image = cv2.resize(image, (inception_sz_resize, inception_sz_resize),interpolation=cv2.INTER_LINEAR)
#image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
image = image[16:16+224,16:16+224]
image = image.astype(np.float32)
image = image - inception_mean
image = image / inception_std
image = image.transpose((2, 0, 1))
return image
if __name__ == '__main__':
inception_transform = make_transform()
image_name = r"./test.jpg"
im = PIL.Image.open(image_name)
result = inception_transform(im)
result = result.numpy()
print('result:',result.shape)
image = cv2.imread(image_name,-1)
result2 = cv2_transform(image)
print('result2:',result2.shape)
结论:
不加Resize和中心裁剪操作,两者一样;
加了Resize和中心裁剪操作,结果基本一致,不影响实际使用;
标签:__,cv2,image,CV2,PyTorch,self,range,inception,预处理 来源: https://blog.csdn.net/u013841196/article/details/121563944
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