Class ThresholdImageOps

java.lang.Object
boofcv.alg.filter.binary.ThresholdImageOps

public class ThresholdImageOps
extends Object

Operations for thresholding images and converting them into a binary image.

  • Constructor Details

    • ThresholdImageOps

      public ThresholdImageOps()
  • Method Details

    • threshold

      public static GrayU8 threshold​(GrayF32 input, @Nullable @Nullable GrayU8 output, float threshold, boolean down)
      Applies a global threshold across the whole image. If 'down' is true, then pixels with values <= to 'threshold' are set to 1 and the others set to 0. If 'down' is false, then pixels with values > to 'threshold' are set to 1 and the others set to 0.
      Parameters:
      input - Input image. Not modified.
      output - (Optional) Binary output image. If null a new image will be declared. Modified.
      threshold - threshold value.
      down - If true then the inequality <= is used, otherwise if false then > is used.
      Returns:
      Output image.
    • threshold

      public static GrayU8 threshold​(GrayF64 input, @Nullable @Nullable GrayU8 output, double threshold, boolean down)
      Applies a global threshold across the whole image. If 'down' is true, then pixels with values <= to 'threshold' are set to 1 and the others set to 0. If 'down' is false, then pixels with values > to 'threshold' are set to 1 and the others set to 0.
      Parameters:
      input - Input image. Not modified.
      output - (Optional) Binary output image. If null a new image will be declared. Modified.
      threshold - threshold value.
      down - If true then the inequality <= is used, otherwise if false then > is used.
      Returns:
      Output image.
    • threshold

      public static GrayU8 threshold​(GrayU8 input, @Nullable @Nullable GrayU8 output, int threshold, boolean down)
      Applies a global threshold across the whole image. If 'down' is true, then pixels with values <= to 'threshold' are set to 1 and the others set to 0. If 'down' is false, then pixels with values > to 'threshold' are set to 1 and the others set to 0.
      Parameters:
      input - Input image. Not modified.
      output - (Optional) Binary output image. If null a new image will be declared. Modified.
      threshold - threshold value.
      down - If true then the inequality <= is used, otherwise if false then > is used.
      Returns:
      Output image.
    • threshold

      public static GrayU8 threshold​(GrayS16 input, @Nullable @Nullable GrayU8 output, int threshold, boolean down)
      Applies a global threshold across the whole image. If 'down' is true, then pixels with values <= to 'threshold' are set to 1 and the others set to 0. If 'down' is false, then pixels with values > to 'threshold' are set to 1 and the others set to 0.
      Parameters:
      input - Input image. Not modified.
      output - (Optional) Binary output image. If null a new image will be declared. Modified.
      threshold - threshold value.
      down - If true then the inequality <= is used, otherwise if false then > is used.
      Returns:
      Output image.
    • threshold

      public static GrayU8 threshold​(GrayU16 input, @Nullable @Nullable GrayU8 output, int threshold, boolean down)
      Applies a global threshold across the whole image. If 'down' is true, then pixels with values <= to 'threshold' are set to 1 and the others set to 0. If 'down' is false, then pixels with values > to 'threshold' are set to 1 and the others set to 0.
      Parameters:
      input - Input image. Not modified.
      output - (Optional) Binary output image. If null a new image will be declared. Modified.
      threshold - threshold value.
      down - If true then the inequality <= is used, otherwise if false then > is used.
      Returns:
      Output image.
    • threshold

      public static GrayU8 threshold​(GrayS32 input, @Nullable @Nullable GrayU8 output, int threshold, boolean down)
      Applies a global threshold across the whole image. If 'down' is true, then pixels with values <= to 'threshold' are set to 1 and the others set to 0. If 'down' is false, then pixels with values > to 'threshold' are set to 1 and the others set to 0.
      Parameters:
      input - Input image. Not modified.
      output - (Optional) Binary output image. If null a new image will be declared. Modified.
      threshold - threshold value.
      down - If true then the inequality <= is used, otherwise if false then > is used.
      Returns:
      Output image.
    • localMean

      public static GrayU8 localMean​(GrayU8 input, @Nullable @Nullable GrayU8 output, ConfigLength width, float scale, boolean down, @Nullable @Nullable GrayU8 storage1, @Nullable @Nullable GrayU8 storage2, @Nullable @Nullable GrowArray<DogArray_I32> storage3)
      Thresholds the image using a locally adaptive threshold that is computed using a local square region centered on each pixel. The threshold is equal to the average value of the surrounding pixels times the scale. If down is true then b(x,y) = I(x,y) ≤ T(x,y) * scale ? 1 : 0. Otherwise b(x,y) = I(x,y) * scale > T(x,y) ? 0 : 1
      Parameters:
      input - Input image.
      output - (optional) Output binary image. If null it will be declared internally.
      width - Width of square region.
      scale - Scale factor used to adjust threshold. Try 0.95
      down - Should it threshold up or down.
      storage1 - (Optional) Storage for intermediate step. If null will be declared internally.
      storage2 - (Optional) Storage for intermediate step. If null will be declared internally.
      Returns:
      Thresholded image.
    • localGaussian

      public static GrayU8 localGaussian​(GrayU8 input, @Nullable @Nullable GrayU8 output, ConfigLength width, float scale, boolean down, @Nullable @Nullable GrayU8 storage1, @Nullable @Nullable GrayU8 storage2)
      Thresholds the image using a locally adaptive threshold that is computed using a local square region centered on each pixel. The threshold is equal to the gaussian weighted sum of the surrounding pixels times the scale. If down is true then b(x,y) = I(x,y) ≤ T(x,y) * scale ? 1 : 0. Otherwise b(x,y) = I(x,y) * scale > T(x,y) ? 0 : 1
      Parameters:
      input - Input image.
      output - (optional) Output binary image. If null it will be declared internally.
      width - Width of square region.
      scale - Scale factor used to adjust threshold. Try 0.95
      down - Should it threshold up or down.
      storage1 - (Optional) Storage for intermediate step. If null will be declared internally.
      storage2 - (Optional) Storage for intermediate step. If null will be declared internally.
      Returns:
      Thresholded image.
    • localMean

      public static GrayU8 localMean​(GrayU16 input, @Nullable @Nullable GrayU8 output, ConfigLength width, float scale, boolean down, @Nullable @Nullable GrayU16 storage1, @Nullable @Nullable GrayU16 storage2, @Nullable @Nullable GrowArray<DogArray_I32> storage3)
      Thresholds the image using a locally adaptive threshold that is computed using a local square region centered on each pixel. The threshold is equal to the average value of the surrounding pixels times the scale. If down is true then b(x,y) = I(x,y) ≤ T(x,y) * scale ? 1 : 0. Otherwise b(x,y) = I(x,y) * scale > T(x,y) ? 0 : 1
      Parameters:
      input - Input image.
      output - (optional) Output binary image. If null it will be declared internally.
      width - Width of square region.
      scale - Scale factor used to adjust threshold. Try 0.95
      down - Should it threshold up or down.
      storage1 - (Optional) Storage for intermediate step. If null will be declared internally.
      storage2 - (Optional) Storage for intermediate step. If null will be declared internally.
      Returns:
      Thresholded image.
    • localGaussian

      public static GrayU8 localGaussian​(GrayU16 input, @Nullable @Nullable GrayU8 output, ConfigLength width, float scale, boolean down, @Nullable @Nullable GrayU16 storage1, @Nullable @Nullable GrayU16 storage2)
      Thresholds the image using a locally adaptive threshold that is computed using a local square region centered on each pixel. The threshold is equal to the gaussian weighted sum of the surrounding pixels times the scale. If down is true then b(x,y) = I(x,y) ≤ T(x,y) * scale ? 1 : 0. Otherwise b(x,y) = I(x,y) * scale > T(x,y) ? 0 : 1
      Parameters:
      input - Input image.
      output - (optional) Output binary image. If null it will be declared internally.
      width - Width of square region.
      scale - Scale factor used to adjust threshold. Try 0.95
      down - Should it threshold up or down.
      storage1 - (Optional) Storage for intermediate step. If null will be declared internally.
      storage2 - (Optional) Storage for intermediate step. If null will be declared internally.
      Returns:
      Thresholded image.
    • localMean

      public static GrayU8 localMean​(GrayF32 input, @Nullable @Nullable GrayU8 output, ConfigLength width, float scale, boolean down, @Nullable @Nullable GrayF32 storage1, @Nullable @Nullable GrayF32 storage2, @Nullable @Nullable GrowArray<DogArray_F32> storage3)
      Thresholds the image using a locally adaptive threshold that is computed using a local square region centered on each pixel. The threshold is equal to the average value of the surrounding pixels times the scale. If down is true then b(x,y) = I(x,y) ≤ T(x,y) * scale ? 1 : 0. Otherwise b(x,y) = I(x,y) * scale > T(x,y) ? 0 : 1
      Parameters:
      input - Input image.
      output - (optional) Output binary image. If null it will be declared internally.
      width - Width of square region.
      scale - Scale factor used to adjust threshold. Try 0.95
      down - Should it threshold up or down.
      storage1 - (Optional) Storage for intermediate step. If null will be declared internally.
      storage2 - (Optional) Storage for intermediate step. If null will be declared internally.
      Returns:
      Thresholded image.
    • localGaussian

      public static GrayU8 localGaussian​(GrayF32 input, @Nullable @Nullable GrayU8 output, ConfigLength width, float scale, boolean down, @Nullable @Nullable GrayF32 storage1, @Nullable @Nullable GrayF32 storage2)
      Thresholds the image using a locally adaptive threshold that is computed using a local square region centered on each pixel. The threshold is equal to the gaussian weighted sum of the surrounding pixels times the scale. If down is true then b(x,y) = I(x,y) ≤ T(x,y) * scale ? 1 : 0. Otherwise b(x,y) = I(x,y) * scale > T(x,y) ? 0 : 1
      Parameters:
      input - Input image.
      output - (optional) Output binary image. If null it will be declared internally.
      width - Width of square region.
      scale - Scale factor used to adjust threshold. Try 0.95
      down - Should it threshold up or down.
      storage1 - (Optional) Storage for intermediate step. If null will be declared internally.
      storage2 - (Optional) Storage for intermediate step. If null will be declared internally.
      Returns:
      Thresholded image.