亮度增强、对比度增强、水平翻转和随机方向旋转

本文链接：https://blog.youkuaiyun.com/qq_39520290/article/details/124056002

这段代码实现了一系列图像增强技术，包括亮度和对比度的随机增强，图像的随机角度旋转以及水平翻转。这些操作可以用于计算机视觉实验或数据集的扩充，以增加模型训练的多样性。

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'''
亮度增强、对比度增强、水平翻转和随机方向旋转
'''
from PIL import ImageEnhance
import os
import numpy as np
from PIL import Image
#1.亮度增强
def brightnessEnhancement(root_path,img_name):
    image = Image.open(os.path.join(root_path, img_name))
    enh_bri = ImageEnhance.Brightness(image)
    # brightness = 1.1+0.4*np.random.random()#取值范围1.1-1.5
    brightness = 1.5
    image_brightened = enh_bri.enhance(brightness)
    return image_brightened

#2.对比度增强
def contrastEnhancement(root_path, img_name):  # 对比度增强
    image = Image.open(os.path.join(root_path, img_name))
    enh_con = ImageEnhance.Contrast(image)
    # contrast = 1.1+0.4*np.random.random()#取值范围1.1-1.5
    contrast = 1.5
    image_contrasted = enh_con.enhance(contrast)
    return image_contrasted

def rotation(root_path, img_name):
    img = Image.open(os.path.join(root_path, img_name))
    random_angle = np.random.randint(-2, 2)*90
    if random_angle==0:
     rotation_img = img.rotate(-90) #旋转角度
    else:
        rotation_img = img.rotate( random_angle)  # 旋转角度
    # rotation_img.save(os.path.join(root_path,img_name.split('.')[0] + '_rotation.jpg'))
    return rotation_img

def flip(root_path,img_name):   #翻转图像
    img = Image.open(os.path.join(root_path, img_name))
    filp_img = img.transpose(Image.FLIP_LEFT_RIGHT)
    # filp_img.save(os.path.join(root_path,img_name.split('.')[0] + '_flip.jpg'))
    return filp_img

def createImage(imageDir,saveDir):
   i=0
   for name in os.listdir(imageDir):
      i=i+1
      saveName="cesun"+str(i)+".jpg"
      saveImage=contrastEnhancement(imageDir,name)
      saveImage.save(os.path.join(saveDir,saveName))
      saveName1 = "flip" + str(i) + ".jpg"
      saveImage1 = flip(imageDir,name)
      saveImage1.save(os.path.join(saveDir, saveName1))
      saveName2 = "brightnessE" + str(i) + ".jpg"
      saveImage2 = brightnessEnhancement(imageDir, name)
      saveImage2.save(os.path.join(saveDir, saveName2))
      saveName3 = "rotate" + str(i) + ".jpg"
      saveImage = rotation(imageDir, name)
      saveImage.save(os.path.join(saveDir, saveName3))

if __name__ == '__main__':
    imageDir="E:\Year1\计算机视觉\数据集\第二次实验" #要改变的图片的路径文件夹
    print('正在干活中.....等一会')
    saveDir="E:\Year1\计算机视觉\图像增强\增强后"   #数据增强生成图片的路径文件夹
    createImage(imageDir, saveDir)
    print('不辱使命....搞完了')```