Video_hal_interface

Detailed Description

Note

Define your functions to override default implementations:

#undef cv_hal_LK_optical_flow_level
#define cv_hal_LK_optical_flow_level my_hal_LK_optical_flow_level

Functions
int	hal_ni_LKOpticalFlowLevel (const uchar *prev_data, size_t prev_data_step, const short *prev_deriv_data, size_t prev_deriv_step, const uchar *next_data, size_t next_step, int width, int height, int cn, const float *prev_points, float *next_points, size_t point_count, uchar *status, float *err, const int win_width, const int win_height, int termination_count, double termination_epsilon, bool get_min_eigen_vals, float min_eigen_vals_threshold)
	Lucas-Kanade optical flow for single pyramid layer. See calcOpticalFlowPyrLK.
int	hal_ni_ScharrDeriv (const uchar *src_data, size_t src_step, short *dst_data, size_t dst_step, int width, int height, int cn)
	Computes Schaar derivatives with inteleaved layout xyxy...

Function Documentation

hal_ni_LKOpticalFlowLevel()

int hal_ni_LKOpticalFlowLevel ( const uchar * prev_data, size_t prev_data_step, const short * prev_deriv_data, size_t prev_deriv_step, const uchar * next_data, size_t next_step, int width, int height, int cn, const float * prev_points, float * next_points, size_t point_count, uchar * status, float * err, const int win_width, const int win_height, int termination_count, double termination_epsilon, bool get_min_eigen_vals, float min_eigen_vals_threshold )

inline

#include <video/src/hal_replacement.hpp>

Lucas-Kanade optical flow for single pyramid layer. See calcOpticalFlowPyrLK.

Note

OpenCV builds pyramid levels with win_size padding. Out-of-bound access to source image data is legal within +-win_size range.

Parameters

prev_data	previous frame image data
prev_data_step	previous frame image data step
prev_deriv_data	previous frame Schaar derivatives
prev_deriv_step	previous frame Schaar derivatives step
next_data	next frame image data
next_step	next frame image step
width	input images width
height	input images height
cn	source image channels
prev_points	2d points coordinates (x,y) on the previous frame
next_points	points coordinates (x,y) on the next frame
point_count	- amount of input points
status	optical flow status for each point. Optional output, expected if not nullptr is provided
err	optical flow estimation error for each point. Optional output, expected if not nullptr is provided
win_width	optical flow window width
win_height	optical flow window heigh
termination_count	maximum algorithm iterations. 0 means unlimited
termination_epsilon	maximal allowed algorithm error
get_min_eigen_vals	return minimal egen values as point errors in err buffer
min_eigen_vals_threshold	eigen values threshold

hal_ni_ScharrDeriv()

int hal_ni_ScharrDeriv ( const uchar * src_data, size_t src_step, short * dst_data, size_t dst_step, int width, int height, int cn )

inline

#include <video/src/hal_replacement.hpp>

Computes Schaar derivatives with inteleaved layout xyxy...

Note

OpenCV builds pyramid levels with win_size padding. Out-of-bound access to source image data is legal within +-win_size range.

Parameters

src_data	source image data
src_step	source image step
dst_data	destination buffer data
dst_step	destination buffer step
width	image width
height	image height
cn	source image channels