Package ai.konduit.serving.data.image.convert.config

Class ImageNormalization

  • public class ImageNormalization
extends java.lang.Object
    • NONE: No image normalization will be applied
    • SCALE: Divide images by maxValue/2, or divide by 255/2 if maxValue is not specified, then subtract 1.0, to give output in range [-1,1]. This is the default.
    • SCALE_01: Divide images by maxValue, or divide by 255 if maxValue is not specified, to give output in range [0,1].
    • SUBTRACT_MEAN: Subtract the channels by the provided meanRgb array, with values [meanRed, meanGreen, meanBlue]. out = (in - mean) for each channel. Note that if the output format is in BGR format, the meanRgb value should still be provided in RGB order
    • STANDARDIZE: Subtract the channels by the provided meanRgb array, and then divide by stdRgb, where meanRgb is [meanRed, meanGreen, meanBlue], and stdRgb is [standardDeviationRed, standardDeviationGreen, standardDeviationBlue]. out = (in - mean)/std for each channel. Note that if the output format is in BGR format, the meanRgb and stdRgb values should still be provided in RGB order.
    • INCEPTION: Applies inception preprocessing for inference/evaluation as described here: inception_preprocessing.py Specifically: preprocess_for_eval method: scale to [-1, 1] range. In practice this is done by dividing by 255 (assuming pixels are in range 0 to 255) to give [0, 1] then subtracting 0.5 and multiplying by 2 to give [-1, 1]. Note uses maxValue (like SCALE) if provided.
    • VGG_SUBTRACT_MEAN: As per SUBTRACT_MEAN but the fixed values [meanRed, meanGreen, meanBlue] = [123.68, 116.779, 103.939]. Note the meanRgb array with these values need not be provided explicitly. If the output format is BGR, these are appropriately reordered before applying to the channels.

    • Field Detail

      • VGG_MEAN_RGB

        protected static final double[] VGG_MEAN_RGB

      • IMAGE_NET_MEAN_RGB

        protected static final double[] IMAGE_NET_MEAN_RGB

      • IMAGE_NET_STD_RGB

        protected static final double[] IMAGE_NET_STD_RGB

    • Constructor Detail

      • ImageNormalization

        public ImageNormalization()

    • Method Detail

      • getVggMeanRgb

        public static double[] getVggMeanRgb()

      • getImagenetMeanRgb

        public static double[] getImagenetMeanRgb()

      • getImageNetStdRgb

        public static double[] getImageNetStdRgb()