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************		Welcome to Virtual Retina	*****************
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		Spiking, large-scale retina simulation software.

			Author : Adrien Wohrer
			Institution : ODYSSEE, INRIA Sophia Antipolis
			Contact : Adrien.Wohrer@sophia.inria.fr
			Project started december 2004.



**************************	 LOG FILE 	*************************

			( started july 19, 2007 )


10-30-2007 :

-------> NEW XML NAMES:
		* in the OPL, 'adaptation-version' is replaced by 'undershoot-version'.
		  corresponding parameters 'adap-***' replaced by 'undershoot-***'

		* at the contrast gain control stage, all names in '**-amacrine**'
		  are replaced by their equivalent '**-adaptation**',
		  accounting for the biological origin of the fast contrast adaptation 
		  modeled here, which is very likely NOT amacrine cells.


10-12-2007 :

-------> SQUARE ARRAY OF SPIKING CELLS: Bug fixed in the sqSpikingChannel (square array of
	 spiking cells), which did not correctly place the spiking cells in the image.


08-21-2007 : 

-------> improved signal representations (cimg_signal_drawer.h and .cc),
	 with real handling of log scales. Corresponding modifications in src/appli executables


08-08-2007 : NEW PACKAGE ONLINE (version 2.1), with

-------> new file architecture (External_Libraries vs VirtualRetina).

-------> Old, rudimentary Makefile replaced by an installation with CMake.

-------> a VirtualRetina/local/ directory is created, with all required bin/ and lib/

-------> Thorough tutorial in pdf, explaining installation, usage and underlying model.

-------> All spatial xml parameters expressed in visual degrees.

-------> Simpler xml names for the different parameters.

-------> Possibility of automatic download and installation of all required libraries,
         with the shell scipt download_build_all.sh


08-06-2007 : Happy birthday Tim

07-24-2007 :

-------> Changed names of the microsaccade generator

-------> Solved numeration bug in Retina_main.cc (size of input_CP , lign 364)


07-19-2007 :

-------> Default synaptic function for the contrast-gain-control
	is taken by default as	
		 V -> V^2
	instead of the old synaptic function
		 V -> pos_part(V-v0) + pos_part(-V-v0)
	used before that.
	You can use <contrast-gain-control-custom>, to have more liberty
	on the choice of the synaptic function.


-------> Change in the xml names for the GANGLION layers :
	the obsolete 'parvocellular-ganglion-layer' and 
	'magnocellular-ganglion-layer' are now replaced by the simple:
	
	'ganglion-layer'.

	But the former names still work.




03-2007 :

-------> All parameters used in the xml definition file are now 
	followed by the unit in which they are expressed.
	example:
		temporal-step is replaced by temporal-step__sec


-------> All spatial parameters are now expressed in visual degrees
	 rather than pixels as before

-------> A pixel/degree conversion is created.