Class AverageDownSampleOps

java.lang.Object
boofcv.alg.filter.misc.AverageDownSampleOps

public class AverageDownSampleOps
extends Object

Operations related to down sampling image by computing the average within square regions. The first square region is from (0,0) to (w-1,w-1), inclusive. Each square region after that is found by skipping over 'w' pixels in x and y directions. partial regions along the right and bottom borders are handled by computing the average with the rectangle defined by the intersection of the image and the square region.

NOTE: Errors are reduced in integer images by rounding instead of standard integer division.

  • Constructor Summary

    Constructors
    Constructor Description
    AverageDownSampleOps()  
  • Method Summary

    Modifier and Type Method Description
    static void down​(GrayF32 input, int sampleWidth, GrayF32 output)
    Down samples the image.
    static void down​(GrayF64 input, int sampleWidth, GrayF64 output)
    Down samples the image.
    static void down​(GrayS16 input, int sampleWidth, GrayI16 output)
    Down samples the image.
    static void down​(GrayS32 input, int sampleWidth, GrayS32 output)
    Down samples the image.
    static void down​(GrayS8 input, int sampleWidth, GrayI8 output)
    Down samples the image.
    static void down​(GrayU16 input, int sampleWidth, GrayI16 output)
    Down samples the image.
    static void down​(GrayU8 input, int sampleWidth, GrayI8 output)
    Down samples the image.
    static void down​(ImageBase input, int sampleWidth, ImageBase output)  
    static void down​(ImageGray input, int sampleWidth, ImageGray output)
    Down samples image.
    static <T extends ImageGray<T>>
    void
    down​(Planar<T> input, int sampleWidth, Planar<T> output)
    Down samples a planar image.
    static <T extends ImageGray<T>>
    void
    down​(Planar<T> input, Planar<T> output)
    Down samples a planar image.
    static <T extends ImageBase<T>>
    void
    down​(T input, T output)
    Down samples image.
    static <T extends ImageGray<T>>
    T
    downMaxPixels​(T full, T small, int maxPixels)
    If the full resolution image is too large it's down sampled to match the maximum allowed pixels.
    static int downSampleSize​(int length, int squareWidth)
    Computes the length of a down sampled image based on the original length and the square width
    static void reshapeDown​(ImageBase image, int inputWidth, int inputHeight, int squareWidth)
    Reshapes an image so that it is the correct size to store the down sampled image

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
  • Constructor Details

    • AverageDownSampleOps

      public AverageDownSampleOps()
  • Method Details

    • downSampleSize

      public static int downSampleSize​(int length, int squareWidth)
      Computes the length of a down sampled image based on the original length and the square width
      Parameters:
      length - Length of side in input image
      squareWidth - Width of region used to down sample images
      Returns:
      Length of side in down sampled image
    • reshapeDown

      public static void reshapeDown​(ImageBase image, int inputWidth, int inputHeight, int squareWidth)
      Reshapes an image so that it is the correct size to store the down sampled image
    • downMaxPixels

      public static <T extends ImageGray<T>> T downMaxPixels​(T full, T small, int maxPixels)
      If the full resolution image is too large it's down sampled to match the maximum allowed pixels.
      Parameters:
      full - Full resolution image
      small - Small image to store down sampled, if applicable
      maxPixels - Maximum number of pixels in the image
      Returns:
      Either full resolution image or the small image
    • down

      public static void down​(ImageBase input, int sampleWidth, ImageBase output)
    • down

      public static void down​(ImageGray input, int sampleWidth, ImageGray output)
      Down samples image. Type checking is done at runtime.
      Parameters:
      input - Input image. Not modified.
      sampleWidth - Width of square region.
      output - Output image. Modified.
    • down

      public static <T extends ImageBase<T>> void down​(T input, T output)
      Down samples image. Type checking is done at runtime.
      Parameters:
      input - Input image. Not modified.
      output - Output image. Modified.
    • down

      public static <T extends ImageGray<T>> void down​(Planar<T> input, int sampleWidth, Planar<T> output)
      Down samples a planar image. Type checking is done at runtime.
      Parameters:
      input - Input image. Not modified.
      sampleWidth - Width of square region.
      output - Output image. Modified.
    • down

      public static <T extends ImageGray<T>> void down​(Planar<T> input, Planar<T> output)
      Down samples a planar image. Type checking is done at runtime.
      Parameters:
      input - Input image. Not modified.
      output - Output image. Modified.
    • down

      public static void down​(GrayU8 input, int sampleWidth, GrayI8 output)
      Down samples the image.
      Parameters:
      input - Input image. Not modified.
      sampleWidth - Width of square region.
      output - Output image. Modified.
    • down

      public static void down​(GrayS8 input, int sampleWidth, GrayI8 output)
      Down samples the image.
      Parameters:
      input - Input image. Not modified.
      sampleWidth - Width of square region.
      output - Output image. Modified.
    • down

      public static void down​(GrayU16 input, int sampleWidth, GrayI16 output)
      Down samples the image.
      Parameters:
      input - Input image. Not modified.
      sampleWidth - Width of square region.
      output - Output image. Modified.
    • down

      public static void down​(GrayS16 input, int sampleWidth, GrayI16 output)
      Down samples the image.
      Parameters:
      input - Input image. Not modified.
      sampleWidth - Width of square region.
      output - Output image. Modified.
    • down

      public static void down​(GrayS32 input, int sampleWidth, GrayS32 output)
      Down samples the image.
      Parameters:
      input - Input image. Not modified.
      sampleWidth - Width of square region.
      output - Output image. Modified.
    • down

      public static void down​(GrayF32 input, int sampleWidth, GrayF32 output)
      Down samples the image.
      Parameters:
      input - Input image. Not modified.
      sampleWidth - Width of square region.
      output - Output image. Modified.
    • down

      public static void down​(GrayF64 input, int sampleWidth, GrayF64 output)
      Down samples the image.
      Parameters:
      input - Input image. Not modified.
      sampleWidth - Width of square region.
      output - Output image. Modified.