WRG : fix a warning message due to comparison between signed and unsigned

DOC : improve doc of CLAHE class

Modules/Filtering/Contrast/include/otbCLHistogramEqualizationFilter.h

@@ -34,7 +34,12 @@ namespace otb
 {
 
 /** \class CLHistogramEqualizationFilter
- *  \brief 
+ *  \brief Implement CLAHE algorithm
+ *  
+ *  This class implement CLAHE algorithm. It is a composite filter that gathers
+ *  the 3 filters (ComputeHisto, ComputeGainLut, ApplyGain) and pipes them with
+ *  additional filters (InPlacePass and StreamingImage) in order to make 
+ *  streaming available. 
  * \ingroup OTBContrast
  */
 

Modules/Filtering/Contrast/include/otbComputeHistoFilter.h

@@ -29,10 +29,10 @@ namespace otb
 {
 
 /** \class ComputeHistoFilter
- *  \brief Compute local histogram with several parameter
+ *  \brief Compute local histogram with several parameters
  *
- *  This class implements the first part of the CLAHE algorithm. It's aim 
- *  is to compute local histogram with several input parameters such as 
+ *  This class implements the first part of the CLAHE algorithm. It aims 
+ *  to compute local histogram with several input parameters such as 
  *  nodata value, threshold, thumbnail size and number of bin. Mandatory parameters are min 
  *  and max value as it will be used in the histogram computation.
  *

Modules/Filtering/Contrast/include/otbComputeHistoFilter.txx

@@ -298,7 +298,7 @@ void ComputeHistoFilter < TInputImage , TOutputImage >
 
   for( unsigned int i = 0 ; i < m_NbBin ; i++ )
     {
-    if ( oit.Get()[i] > height )
+    if ( static_cast<unsigned int>( oit.Get()[i] ) > height )
       {
       rest += oit.Get()[i] - height ;
       oit.Get()[i] = height ;