pixel_desc.h
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	/*
	Copyright (C) 2014 Jerome Revaud

	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program. If not, see <http://www.gnu.org/licenses/>
	*/
	#ifndef ___PIXEL_DESC_H___
	#define ___PIXEL_DESC_H___
	#include "image.h"
	#include "array_types.h"


	// pixel descriptor params
	typedef struct {
	float presmooth_sigma; // image pre-smoothing
	float mid_smoothing; // smoothing of oriented gradients (before sigmoid)
	float post_smoothing; // smoothing of oriented gradients (after sigmoid)
	float hog_sigmoid; // sigmoid strength
	float ninth_dim; // small constant for gradient-less area
	bool norm_pixels; // 1: normalize pixels separately / 0: normalize atomic patches

	} desc_params_t;


	// set default params
	void set_default_desc_params( desc_params_t* params );


	/* extract pixel descriptors (pixel-wise HOG)
	*/
	float_layers* extract_desc( image_t* _img, const desc_params_t* params, int nt );

	#endif