retinex_pde_lib.h File Reference

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Functions
float *	retinex_pde (float *data, size_t nx, size_t ny, float t)
	retinex PDE implementation

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Function Documentation

float* retinex_pde	(	float *	data,
		size_t	nx,
		size_t	ny,
		float	t
	)

retinex PDE implementation

This function solves the Retinex PDE equation with forward and backward DCT.

The input array is processed as follow:

• a discrete laplacian is computed with a threshold;
• this discrete laplacian array is symmetrised in both directions;
• this data is transformed by forward DFT (both steps can be handled by a simple DCT);
• the DFT data is modified by ;
• this data is transformed by backward DFT.

Parameters:

	data	input/output array
	nx,ny	dimension
	t	retinex threshold

Returns:

data, or NULL if an error occured

Definition at line 268 of file retinex_pde_lib.c.

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