FFmpeg
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fast deshake / depan video filter More...
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
#include "libavutil/common.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavcodec/dsputil.h"
#include "deshake.h"
#include "deshake_opencl.h"
Go to the source code of this file.
Macros | |
#define | CHROMA_WIDTH(link) -((-link->w) >> av_pix_fmt_desc_get(link->format)->log2_chroma_w) |
#define | CHROMA_HEIGHT(link) -((-link->h) >> av_pix_fmt_desc_get(link->format)->log2_chroma_h) |
#define | OFFSET(x) offsetof(DeshakeContext, x) |
#define | FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
#define | MAX_R 64 |
#define | CMP(i, j) |
Functions | |
AVFILTER_DEFINE_CLASS (deshake) | |
static int | cmp (const double *a, const double *b) |
static double | clean_mean (double *values, int count) |
Cleaned mean (cuts off 20% of values to remove outliers and then averages) | |
static void | find_block_motion (DeshakeContext *deshake, uint8_t *src1, uint8_t *src2, int cx, int cy, int stride, IntMotionVector *mv) |
Find the most likely shift in motion between two frames for a given macroblock. | |
static int | block_contrast (uint8_t *src, int x, int y, int stride, int blocksize) |
Find the contrast of a given block. | |
static double | block_angle (int x, int y, int cx, int cy, IntMotionVector *shift) |
Find the rotation for a given block. | |
static void | find_motion (DeshakeContext *deshake, uint8_t *src1, uint8_t *src2, int width, int height, int stride, Transform *t) |
Find the estimated global motion for a scene given the most likely shift for each block in the frame. | |
static int | deshake_transform_c (AVFilterContext *ctx, int width, int height, int cw, int ch, const float *matrix_y, const float *matrix_uv, enum InterpolateMethod interpolate, enum FillMethod fill, AVFrame *in, AVFrame *out) |
static av_cold int | init (AVFilterContext *ctx) |
static int | query_formats (AVFilterContext *ctx) |
static int | config_props (AVFilterLink *link) |
static av_cold void | uninit (AVFilterContext *ctx) |
static int | filter_frame (AVFilterLink *link, AVFrame *in) |
Variables | |
static const AVOption | deshake_options [] |
static const AVFilterPad | deshake_inputs [] |
static const AVFilterPad | deshake_outputs [] |
AVFilter | avfilter_vf_deshake |
fast deshake / depan video filter
SAD block-matching motion compensation to fix small changes in horizontal and/or vertical shift. This filter helps remove camera shake from hand-holding a camera, bumping a tripod, moving on a vehicle, etc.
Algorithm:
TODO:
Dark Shikari links to http://wiki.videolan.org/SoC_x264_2010#GPU_Motion_Estimation_2 for an algorithm similar to what could be used here to get the gmv It requires only a couple diamond searches + fast downscaling
Special thanks to Jason Kotenko for his help with the algorithm and my inability to see simple errors in C code.
Definition in file vf_deshake.c.
#define CHROMA_WIDTH | ( | link | ) | -((-link->w) >> av_pix_fmt_desc_get(link->format)->log2_chroma_w) |
Definition at line 65 of file vf_deshake.c.
Referenced by filter_frame().
#define CHROMA_HEIGHT | ( | link | ) | -((-link->h) >> av_pix_fmt_desc_get(link->format)->log2_chroma_h) |
Definition at line 66 of file vf_deshake.c.
Referenced by filter_frame().
#define OFFSET | ( | x | ) | offsetof(DeshakeContext, x) |
Definition at line 68 of file vf_deshake.c.
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
Definition at line 69 of file vf_deshake.c.
#define MAX_R 64 |
Definition at line 71 of file vf_deshake.c.
Referenced by find_motion().
#define CMP | ( | i, | |
j | |||
) |
Referenced by find_block_motion().
AVFILTER_DEFINE_CLASS | ( | deshake | ) |
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Definition at line 97 of file vf_deshake.c.
Referenced by clean_mean().
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Cleaned mean (cuts off 20% of values to remove outliers and then averages)
Definition at line 105 of file vf_deshake.c.
Referenced by find_motion().
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Find the most likely shift in motion between two frames for a given macroblock.
Test each block against several shifts given by the rx and ry attributes. Searches using a simple matrix of those shifts and chooses the most likely shift by the smallest difference in blocks.
Definition at line 126 of file vf_deshake.c.
Referenced by find_motion().
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Find the contrast of a given block.
When searching for global motion we really only care about the high contrast blocks, so using this method we can actually skip blocks we don't care much about.
Definition at line 197 of file vf_deshake.c.
Referenced by find_motion().
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Find the rotation for a given block.
Definition at line 221 of file vf_deshake.c.
Referenced by find_motion().
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Find the estimated global motion for a scene given the most likely shift for each block in the frame.
The global motion is estimated to be the same as the motion from most blocks in the frame, so if most blocks move one pixel to the right and two pixels down, this would yield a motion vector (1, -2).
Definition at line 242 of file vf_deshake.c.
Referenced by filter_frame().
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Definition at line 323 of file vf_deshake.c.
Referenced by init().
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Definition at line 349 of file vf_deshake.c.
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Definition at line 393 of file vf_deshake.c.
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Definition at line 406 of file vf_deshake.c.
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Definition at line 422 of file vf_deshake.c.
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Definition at line 436 of file vf_deshake.c.
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Definition at line 73 of file vf_deshake.c.
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Definition at line 552 of file vf_deshake.c.
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Definition at line 562 of file vf_deshake.c.
AVFilter avfilter_vf_deshake |
Definition at line 570 of file vf_deshake.c.