caffe中Image Data layer的圖像增強操作-transformer_param

caffe中ImageData layer的圖像增強操作

• mirror

  mirror:ture代表隨機的左右翻轉。

  It is random left-right flipping, a common operating when training models.

• contrast_brightness_adjustment

  開啓或者禁止對比度調節，默認禁止(false)
  contrast_brightness_adjustment:true

• min_side_min

  min_side_min and min_side_max are added for random cropping while keeping the aspect ratio。 as mentioned in “Deep Residual Learning for Image Recognition”(http://arxiv.org/abs/1512.03385)
  min_side_min:224

  使用了min_side_min和min_side_max就不需要再在image_data_param中設置new_height和new_width兩個參數。在這裏圖片將被隨機resize到這個區間內

• min_side_max

  min_side_max:256

• crop_size

  crop_size:224
  在caffe中，如果定義了crop_size，那麼在train時會對大於crop_size的圖片進行隨機裁剪，而在test時只是截取中間部分

• max_rotation_angle

  圖片最大的旋轉角度，默認爲0
  max_rotation_angle:15

• min_contrast

  最小的對比度乘子(min alpha)，默認0.8

• max_contrast

  最大對比度乘子(max alpha)，默認1.2

• max_smooth

  最大平滑乘子，默認6
  進行高斯平滑

• apply_probability

  每個操作被執行的概率，默認爲0.5

• max_color_shift

  在RGB軸上最大的色彩偏移
  max_color_shift:20

• mean_value:

  BGR順序的均值

• debug_params

  使能或禁止打印操作參數，默認禁止
  debug_params:false

• min_side

  resize & crop 保持縱橫比，默認0，disabled

• max_brightness_shift

  max brightness shift in positive and negative directions (beta), default 5;

• smooth_filtering

  enable/disable smooth filterion, default false;

例子

   layer {
     name: "in_shop"
     type: "ImageData"
     top: "data"
     top: "label"
     include{
       phase: TRAIN
     }
     transform_param {
       mirror: true
       contrast_brightness_adjustment: true
       min_side_min: 224
       min_side_max: 256
       crop_size: 224
       max_rotation_angle: 15
       min_contrast: 0.8
       max_contrast: 1.2
       max_smooth: 6
       apply_probability: 0.5
       max_color_shift: 20
       mean_value: 104
       mean_value: 117
       mean_value: 123
       debug_params: false
     }
    image_data_param {
       source: "/export/home/dyh/workspace/circle_k/for_douyuhao/all-sample.txt"
       batch_size: 128
       new_height: 256
       new_width: 256
       shuffle: true
       root_folder: "/export/home/dyh/workspace/circle_k/for_douyuhao/all-images/"
     }
   }

參考：https://github.com/twtygqyy/caffe-augmentation/blob/master/README.md