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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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49df4dca3c
Reimplement sobel in a multipass fully separated convolution: - calculate x gradient map convolving first horizontally with blurring kernel and then vertically with differentiating kernel - calculate y gradient map convolving first vertically with blurring kernel and then horizonally with differentiating kernel - calculate length of the gradient vector Particular care was needed with normalization of the blurring kernel and with grey level offset of the differentiating one to prevent overflow of rgb values from the [0.0,1.0] range in intermediate passes. Now works on i915.
52 lines
2.1 KiB
C
52 lines
2.1 KiB
C
/*
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* GStreamer
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* Copyright (C) 2008 Filippo Argiolas <filippo.argiolas@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __GST_GL_EFFECTS_SOURCES_H__
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#define __GST_GL_EFFECTS_SOURCES_H__
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extern const gchar *vertex_shader_source;
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extern const gchar *identity_fragment_source;
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extern const gchar *mirror_fragment_source;
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extern const gchar *squeeze_fragment_source;
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extern const gchar *stretch_fragment_source;
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extern const gchar *tunnel_fragment_source;
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extern const gchar *fisheye_fragment_source;
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extern const gchar *twirl_fragment_source;
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extern const gchar *bulge_fragment_source;
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extern const gchar *square_fragment_source;
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extern const gchar *luma_threshold_fragment_source;
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extern const gchar *sobel_fragment_source;
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extern const gchar *sobel_gradient_length_fragment_source;
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extern const gchar *hconv3_fragment_source;
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extern const gchar *vconv3_fragment_source;
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extern const gchar *hconv9_fragment_source;
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extern const gchar *vconv9_fragment_source;
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extern const gchar *sum_fragment_source;
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extern const gchar *luma_to_curve_fragment_source;
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extern const gchar *rgb_to_curve_fragment_source;
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extern const gchar *sin_fragment_source;
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extern const gchar *interpolate_fragment_source;
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extern const gchar *texture_interp_fragment_source;
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extern const gchar *difference_fragment_source;
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extern const gchar *multiply_fragment_source;
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void fill_gaussian_kernel (float *kernel, int size, float sigma);
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#endif /* __GST_GL_EFFECTS_SOURCES_H__ */
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