pixel_desc.h
3ec79a83cd4dcluster_pipeline

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