vpx/vp9/common/vp9_coefupdateprobs.h

/*
 *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#ifndef VP9_COMMON_VP9_COEFUPDATEPROBS_H_
#define VP9_COMMON_VP9_COEFUPDATEPROBS_H_

/* Update probabilities for the nodes in the token entropy tree.
   Generated file included by vp9_entropy.c */

static const vp9_prob vp9_coef_update_prob[ENTROPY_NODES] = {
  252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252
};

#if CONFIG_MODELCOEFPROB
#define COEF_MODEL_UPDATE_PROB   16
#endif

#endif  // VP9_COMMON_VP9_COEFUPDATEPROBS_H__
Initial WebM release 2010-05-18 17:58:33 +02:00			`/*`
Use WebM in copyright notice for consistency Changes 'The VP8 project' to 'The WebM project', for consistency with other webmproject.org repositories. Fixes issue #97. Change-Id: I37c13ed5fbdb9d334ceef71c6350e9febed9bbba 2010-09-09 14:16:39 +02:00			`* Copyright (c) 2010 The WebM project authors. All Rights Reserved.`
Initial WebM release 2010-05-18 17:58:33 +02:00			`*`
cosmetics: trim trailing whitespace When the license headers were updated, they accidentally contained trailing whitespace, so unfortunately we have to touch all the files again. Change-Id: I236c05fade06589e417179c0444cb39b09e4200d 2010-06-18 18:39:21 +02:00			`* Use of this source code is governed by a BSD-style license`
LICENSE: update with latest text Change-Id: Ieebea089095d9073b3a94932791099f614ce120c 2010-06-04 22:19:40 +02:00			`* that can be found in the LICENSE file in the root of the source`
			`* tree. An additional intellectual property rights grant can be found`
cosmetics: trim trailing whitespace When the license headers were updated, they accidentally contained trailing whitespace, so unfortunately we have to touch all the files again. Change-Id: I236c05fade06589e417179c0444cb39b09e4200d 2010-06-18 18:39:21 +02:00			`* in the file PATENTS. All contributing project authors may`
LICENSE: update with latest text Change-Id: Ieebea089095d9073b3a94932791099f614ce120c 2010-06-04 22:19:40 +02:00			`* be found in the AUTHORS file in the root of the source tree.`
Initial WebM release 2010-05-18 17:58:33 +02:00			`*/`

Use standard integer types for pixel values and coefficients. For coefficients, use int16_t (instead of short); for pixel values in 16-bit intermediates, use uint16_t (instead of unsigned short); for all others, use uint8_t (instead of unsigned char). Change-Id: I3619cd9abf106c3742eccc2e2f5e89a62774f7da 2012-12-19 00:31:19 +01:00			`#ifndef VP9_COMMON_VP9_COEFUPDATEPROBS_H_`
Code cleanup. Removing redundant 'extern' keywords, fixing formatting and #include order, code simplification. Change-Id: I0e5fdc8009010f3f885f13b5d76859b9da511758 2013-03-05 23:12:16 +01:00			`#define VP9_COMMON_VP9_COEFUPDATEPROBS_H_`
Initial WebM release 2010-05-18 17:58:33 +02:00
			`/* Update probabilities for the nodes in the token entropy tree.`
Add vp9_ prefix to all vp9 files Support for gyp which doesn't support multiple objects in the same static library having the same basename. Change-Id: Ib947eefbaf68f8b177a796d23f875ccdfa6bc9dc 2012-11-27 22:59:17 +01:00			`Generated file included by vp9_entropy.c */`
Modeling default coef probs with distribution Replaces the default tables for single coefficient magnitudes with those obtained from an appropriate distribution. The EOB node is left unchanged. The model is represeted as a 256-size codebook where the index corresponds to the probability of the Zero or the One node. Two variations are implemented corresponding to whether the Zero node or the One-node is used as the peg. The main advantage is that the default prob tables will become considerably smaller and manageable. Besides there is substantially less risk of over-fitting for a training set. Various distributions are tried and the one that gives the best results is the family of Generalized Gaussian distributions with shape parameter 0.75. The results are within about 0.2% of fully trained tables for the Zero peg variant, and within 0.1% of the One peg variant. The forward updates are optionally (controlled by a macro) model-based, i.e. restricted to only convey probabilities from the codebook. Backward updates can also be optionally (controlled by another macro) model-based, but is turned off by default. Currently model-based forward updates work about the same as unconstrained updates, but there is a drop in performance with backward-updates being model based. The model based approach also allows the probabilities for the key frames to be adjusted from the defaults based on the base_qindex of the frame. Currently the adjustment function is a placeholder that adjusts the prob of EOB and Zero node from the nominal one at higher quality (lower qindex) or lower quality (higher qindex) ends of the range. The rest of the probabilities are then derived based on the model from the adjusted prob of zero. Change-Id: Iae050f3cbcc6d8b3f204e8dc395ae47b3b2192c9 2013-03-13 19:03:17 +01:00
			`static const vp9_prob vp9_coef_update_prob[ENTROPY_NODES] = {`
			`252, 252, 252, 252, 252, 252, 252, 252, 252, 252, 252`
			`};`
Use standard integer types for pixel values and coefficients. For coefficients, use int16_t (instead of short); for pixel values in 16-bit intermediates, use uint16_t (instead of unsigned short); for all others, use uint8_t (instead of unsigned char). Change-Id: I3619cd9abf106c3742eccc2e2f5e89a62774f7da 2012-12-19 00:31:19 +01:00
Modeling default coef probs with distribution Replaces the default tables for single coefficient magnitudes with those obtained from an appropriate distribution. The EOB node is left unchanged. The model is represeted as a 256-size codebook where the index corresponds to the probability of the Zero or the One node. Two variations are implemented corresponding to whether the Zero node or the One-node is used as the peg. The main advantage is that the default prob tables will become considerably smaller and manageable. Besides there is substantially less risk of over-fitting for a training set. Various distributions are tried and the one that gives the best results is the family of Generalized Gaussian distributions with shape parameter 0.75. The results are within about 0.2% of fully trained tables for the Zero peg variant, and within 0.1% of the One peg variant. The forward updates are optionally (controlled by a macro) model-based, i.e. restricted to only convey probabilities from the codebook. Backward updates can also be optionally (controlled by another macro) model-based, but is turned off by default. Currently model-based forward updates work about the same as unconstrained updates, but there is a drop in performance with backward-updates being model based. The model based approach also allows the probabilities for the key frames to be adjusted from the defaults based on the base_qindex of the frame. Currently the adjustment function is a placeholder that adjusts the prob of EOB and Zero node from the nominal one at higher quality (lower qindex) or lower quality (higher qindex) ends of the range. The rest of the probabilities are then derived based on the model from the adjusted prob of zero. Change-Id: Iae050f3cbcc6d8b3f204e8dc395ae47b3b2192c9 2013-03-13 19:03:17 +01:00			`#if CONFIG_MODELCOEFPROB`
			`#define COEF_MODEL_UPDATE_PROB 16`
			`#endif`

Use standard integer types for pixel values and coefficients. For coefficients, use int16_t (instead of short); for pixel values in 16-bit intermediates, use uint16_t (instead of unsigned short); for all others, use uint8_t (instead of unsigned char). Change-Id: I3619cd9abf106c3742eccc2e2f5e89a62774f7da 2012-12-19 00:31:19 +01:00			`#endif // VP9_COMMON_VP9_COEFUPDATEPROBS_H__`