added access methods to retreive retina input and output buffers sizes

modules/contrib/include/opencv2/contrib/retina.hpp

@@ -165,6 +165,16 @@ public:
 
 	virtual ~Retina();
 
+	/**
+        * retreive retina input buffer size 
+        */
+        Size inputSize();
+
+	/**
+        * retreive retina output buffer size 
+        */
+        Size outputSize();
+
 	/**
 	 * try to open an XML retina parameters file to adjust current retina instance setup
 	 * => if the xml file does not exist, then default setup is applied

modules/contrib/src/retina.cpp

@@ -93,6 +93,17 @@ Retina::~Retina()
         delete _retinaFilter;
 }
 
+/**
+* retreive retina input buffer size 
+*/
+Size Retina::inputSize(){return cv::Size(_retinaFilter->getInputNBcolumns(), _retinaFilter->getInputNBrows());}
+
+/**
+* retreive retina output buffer size 
+*/
+Size Retina::outputSize(){return cv::Size(_retinaFilter->getOutputNBcolumns(), _retinaFilter->getOutputNBrows());}
+
+
 void Retina::setColorSaturation(const bool saturateColors, const float colorSaturationValue)
 {
 	_retinaFilter->setColorSaturation(saturateColors, colorSaturationValue);