Examples of javax.media.jai.Histogram

javax.media.jai.Histogram
This class represents a histogram accumulated from a RenderedImage.
A "bin" is a container, where each element stores the total number of pixel samples of an image whose values lie within a given range. A histogram of an image consists of a list of such bins whose range does not overlap with each other (mutually exclusive). For an image that has multiple samples per pixel (multi-banded images), a separate list of bins represents each individual band.
A "low-value" specifies the lowest inclusive pixel value to be checked, and a "high-value" specifies the highest exclusive pixel value to be checked. Therefore, the width of a bin (binWidth) is determined by (highValue - lowValue) / numberOfBins. The range of bin i is defined as from lowValue + i * binWidth inclusive to lowValue + (i + 1) * binWidth exclusive.
The image may have any data type. Its histogram may be accumulated over the entire image, or over a specific region-of-interest (ROI) within the image's bounds. Furthermore, the horizontal and vertical subsampling factors specify the rate of sampling in the two directions, so that only every nth pixel will be counted. This allows the accuracy of the histogram to be traded for the speed of the computation. Of course a subsampling rate of 1 means every pixel will be counted.
The "Histogram" operator generates the histogram data of an image and uses this object to store the final pixel counts. The operator returns an instance of this class when a request is made via the getProperty method for the "histogram" property. The actual bins may be obtained by calling the getBins method. @see ROI @see javax.media.jai.operator.HistogramDescriptor

        return names;
    }


    protected Object createStatistics(String name) {
        if (name.equalsIgnoreCase("histogram")) {
            return new Histogram(numBins, lowValue, highValue);
        } else {
            return java.awt.Image.UndefinedProperty;
        }
    }

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    }


    protected void accumulateStatistics(String name,
                                        Raster source,
                                        Object stats) {
        Histogram histogram = (Histogram)stats;
        histogram.countPixels(source, roi, xStart, yStart, xPeriod, yPeriod);
    }

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            // Property is not a Histogram.
            msg.append(getName() + " " +
                       JaiI18N.getString("MatchCDFDescriptor2"));
            return false;
  } else {
      Histogram hist = (Histogram)prop;
      int numBands = hist.getNumBands();


            if (CDF == null) {
                int[] numBins = hist.getNumBins();
                CDF = new float[numBands][];


                for (int b = 0; b < numBands; b++) {
                    CDF[b] = new float[numBins[b]];
                    for (int i = 0; i < numBins[b]; i++)
                        CDF[b][i] = (i + 1)/numBins[b];
                }
            }


      if(CDF.length != numBands) {
                // CDF length does not match Histogram.
          msg.append(getName() + " " +
         JaiI18N.getString("MatchCDFDescriptor3"));
    return false;
      }


      for(int b = 0; b < numBands; b++) {
          if(CDF[b].length != hist.getNumBins(b)) {
                    // Check that CDF length for this band matches Histogram.
        msg.append(getName() + " " +
             JaiI18N.getString("MatchCDFDescriptor4"));
        return false;
    }

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        ImageLayout layout = RIFUtil.getImageLayoutHint(renderHints);
        


        // Derive breakpoints from the histogram and specified CDF.
  RenderedImage src = args.getRenderedSource(0);
  Histogram hist = (Histogram)src.getProperty("histogram");
  float[][] CDF = (float[][])args.getObjectParameter(0);
  float[][][] bp = createSpecificationMap(hist, CDF);


  return new PiecewiseOpImage(src, renderHints, layout, bp);
    }

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/* 182 */     return names;
/*     */   }
/*     */ 
/*     */   protected Object createStatistics(String name) {
/* 186 */     if (name.equalsIgnoreCase("histogram")) {
/* 187 */       return new Histogram(this.numBins, this.lowValueFP, this.highValueFP);
/*     */     }
/* 189 */     return java.awt.Image.UndefinedProperty;
/*     */   }

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/* 189 */     return java.awt.Image.UndefinedProperty;
/*     */   }
/*     */ 
/*     */   protected void accumulateStatistics(String name, Raster source, Object stats)
/*     */   {
/* 197 */     Histogram histogram = (Histogram)stats;
/* 198 */     int numBands = histogram.getNumBands();
/* 199 */     int[][] histJAI = histogram.getBins();
/*     */ 
/* 202 */     Rectangle tileRect = source.getBounds();
/*     */     int[][] histo;
/*     */     int[][] histo;
/* 206 */     if ((!this.reorderBands) && (tileRect.equals(getBounds())))
/*     */     {
/* 208 */       histo = histJAI;
/*     */     }
/*     */     else {
/* 211 */       histo = new int[numBands][];
/* 212 */       for (int i = 0; i < numBands; i++) {
/* 213 */         histo[i] = new int[histogram.getNumBins(i)];
/*     */       }
/*     */ 
/*     */     }
/*     */ 
/* 218 */     int formatTag = MediaLibAccessor.findCompatibleTag(null, source);

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/*     */     {
/* 149 */       msg.append(getName() + " " + JaiI18N.getString("MatchCDFDescriptor2"));
/*     */ 
/* 151 */       return false;
/*     */     }
/* 153 */     Histogram hist = (Histogram)prop;
/* 154 */     int numBands = hist.getNumBands();
/*     */ 
/* 156 */     if (CDF == null) {
/* 157 */       int[] numBins = hist.getNumBins();
/* 158 */       CDF = new float[numBands][];
/*     */ 
/* 160 */       for (int b = 0; b < numBands; b++) {
/* 161 */         CDF[b] = new float[numBins[b]];
/* 162 */         for (int i = 0; i < numBins[b]; i++) {
/* 163 */           CDF[b][i] = ((i + 1) / numBins[b]);
/*     */         }
/*     */       }
/*     */     }
/* 167 */     if (CDF.length != numBands)
/*     */     {
/* 169 */       msg.append(getName() + " " + JaiI18N.getString("MatchCDFDescriptor3"));
/*     */ 
/* 171 */       return false;
/*     */     }
/*     */ 
/* 174 */     for (int b = 0; b < numBands; b++) {
/* 175 */       if (CDF[b].length != hist.getNumBins(b))
/*     */       {
/* 177 */         msg.append(getName() + " " + JaiI18N.getString("MatchCDFDescriptor4"));
/*     */ 
/* 179 */         return false;
/*     */       }

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/*     */   public RenderedImage create(ParameterBlock args, RenderingHints renderHints)
/*     */   {
/* 142 */     ImageLayout layout = RIFUtil.getImageLayoutHint(renderHints);
/*     */ 
/* 146 */     RenderedImage src = args.getRenderedSource(0);
/* 147 */     Histogram hist = (Histogram)src.getProperty("histogram");
/* 148 */     float[][] CDF = (float[][])args.getObjectParameter(0);
/* 149 */     float[][][] bp = createSpecificationMap(hist, CDF);
/*     */ 
/* 151 */     return new PiecewiseOpImage(src, renderHints, layout, bp);
/*     */   }

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/*  99 */     return names;
/*     */   }
/*     */ 
/*     */   protected Object createStatistics(String name) {
/* 103 */     if (name.equalsIgnoreCase("histogram")) {
/* 104 */       return new Histogram(this.numBins, this.lowValue, this.highValue);
/*     */     }
/* 106 */     return Image.UndefinedProperty;
/*     */   }

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/* 106 */     return Image.UndefinedProperty;
/*     */   }
/*     */ 
/*     */   protected void accumulateStatistics(String name, Raster source, Object stats)
/*     */   {
/* 113 */     Histogram histogram = (Histogram)stats;
/* 114 */     histogram.countPixels(source, this.roi, this.xStart, this.yStart, this.xPeriod, this.yPeriod);
/*     */   }

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