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Diffstat (limited to 'third_party/aom/aom_dsp/noise_util.h')
-rw-r--r-- | third_party/aom/aom_dsp/noise_util.h | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/third_party/aom/aom_dsp/noise_util.h b/third_party/aom/aom_dsp/noise_util.h new file mode 100644 index 0000000000..2284a171a4 --- /dev/null +++ b/third_party/aom/aom_dsp/noise_util.h @@ -0,0 +1,68 @@ +/* + * Copyright (c) 2017, Alliance for Open Media. All rights reserved + * + * This source code is subject to the terms of the BSD 2 Clause License and + * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License + * was not distributed with this source code in the LICENSE file, you can + * obtain it at www.aomedia.org/license/software. If the Alliance for Open + * Media Patent License 1.0 was not distributed with this source code in the + * PATENTS file, you can obtain it at www.aomedia.org/license/patent. + */ + +#ifndef AOM_AOM_DSP_NOISE_UTIL_H_ +#define AOM_AOM_DSP_NOISE_UTIL_H_ + +#ifdef __cplusplus +extern "C" { +#endif // __cplusplus + +// aom_noise_tx_t is an abstraction of a transform that is used for denoising. +// It is meant to be lightweight and does hold the transformed data (as +// the user should not be manipulating the transformed data directly). +struct aom_noise_tx_t; + +// Allocates and returns a aom_noise_tx_t useful for denoising the given +// block_size. The resulting aom_noise_tx_t should be free'd with +// aom_noise_tx_free. +struct aom_noise_tx_t *aom_noise_tx_malloc(int block_size); +void aom_noise_tx_free(struct aom_noise_tx_t *aom_noise_tx); + +// Transforms the internal data and holds it in the aom_noise_tx's internal +// buffer. For compatibility with existing SIMD implementations, "data" must +// be 32-byte aligned. +void aom_noise_tx_forward(struct aom_noise_tx_t *aom_noise_tx, + const float *data); + +// Filters aom_noise_tx's internal data using the provided noise power spectral +// density. The PSD must be at least block_size * block_size and should be +// populated with a constant or via estimates taken from +// aom_noise_tx_add_energy. +void aom_noise_tx_filter(struct aom_noise_tx_t *aom_noise_tx, const float *psd); + +// Performs an inverse transform using the internal transform data. +// For compatibility with existing SIMD implementations, "data" must be 32-byte +// aligned. +void aom_noise_tx_inverse(struct aom_noise_tx_t *aom_noise_tx, float *data); + +// Aggregates the power of the buffered transform data into the psd buffer. +void aom_noise_tx_add_energy(const struct aom_noise_tx_t *aom_noise_tx, + float *psd); + +// Returns a default value suitable for denosing a transform of the given +// block_size. The noise "factor" determines the strength of the noise to +// be removed. A value of about 2.5 can be used for moderate denoising, +// where a value of 5.0 can be used for a high level of denoising. +float aom_noise_psd_get_default_value(int block_size, float factor); + +// Computes normalized cross correlation of two vectors a and b of length n. +double aom_normalized_cross_correlation(const double *a, const double *b, + int n); + +// Validates the correlated noise in the data buffer of size (w, h). +int aom_noise_data_validate(const double *data, int w, int h); + +#ifdef __cplusplus +} // extern "C" +#endif // __cplusplus + +#endif // AOM_AOM_DSP_NOISE_UTIL_H_ |