env_c_math_ops.c File Reference

#include "Envision/env_c_math_ops.h"
#include "Envision/env_log.h"
#include "Envision/env_types.h"

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Functions
void	env_c_lowpass_5_x_dec_x_fewbits_optim (const intg32 *src, const env_size_t w, const env_size_t h, intg32 *dst, const env_size_t w2)
void	env_c_lowpass_5_y_dec_y_fewbits_optim (const intg32 *src, const env_size_t w, const env_size_t h, intg32 *dst, const env_size_t h2)
void	env_c_lowpass_9_x_fewbits_optim (const intg32 *src, const env_size_t w, const env_size_t h, intg32 *dst)
	Like env_c_lowpass_9_x_fewbits() but uses optimized filter coefficients.
void	env_c_lowpass_9_y_fewbits_optim (const intg32 *src, const env_size_t w, const env_size_t h, intg32 *dst)
	Like env_c_lowpass_9_y_fewbits() but uses optimized filter coefficients.
void	env_c_get_min_max (const intg32 *src, const env_size_t sz, intg32 *xmini, intg32 *xmaxi)
	Get min and max values.
void	env_c_inplace_rectify (intg32 *dst, const env_size_t sz)
	Saturate values < 0.
void	env_c_inplace_normalize (intg32 *const dst, const env_size_t sz, const intg32 nmin, const intg32 nmax, intg32 *const actualmin_p, intg32 *const actualmax_p, const intg32 rangeThresh)
void	env_c_luminance_from_byte (const struct env_rgb_pixel *const src, const env_size_t sz, const env_size_t nbits, intg32 *const dst)
	get the luminance with nbits of precision of the input image
void	env_c_image_div_scalar (const intg32 *const a, const env_size_t sz, intg32 val, intg32 *const dst)
	result = a / val
void	env_c_image_div_scalar_accum (const intg32 *const a, const env_size_t sz, intg32 val, intg32 *const dst)
	result += a / val
void	env_c_image_minus_image (const intg32 *const a, const intg32 *const b, const env_size_t sz, intg32 *const dst)
	result = a - b

---

Detailed Description

Fixed-point integer math versions of some of our floating-point image functions

Definition in file env_c_math_ops.c.

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Function Documentation

void env_c_get_min_max	(	const intg32 *	src,
		const env_size_t	sz,
		intg32 *	xmini,
		intg32 *	xmaxi
	)

Get min and max values.

Definition at line 292 of file env_c_math_ops.c.

void env_c_image_div_scalar	(	const intg32 *const	a,
		const env_size_t	sz,
		intg32	val,
		intg32 *const	dst
	)

result = a / val

Definition at line 426 of file env_c_math_ops.c.

Referenced by env_chan_orientation(), env_motion_channel_input_and_consume_pyr(), env_mt_chan_orientation(), and env_mt_motion_channel_input_and_consume_pyr().

void env_c_image_div_scalar_accum	(	const intg32 *const	a,
		const env_size_t	sz,
		intg32	val,
		intg32 *const	dst
	)

result += a / val

Definition at line 436 of file env_c_math_ops.c.

Referenced by env_chan_orientation(), env_motion_channel_input_and_consume_pyr(), env_mt_chan_orientation(), and env_mt_motion_channel_input_and_consume_pyr().

void env_c_image_minus_image	(	const intg32 *const	a,
		const intg32 *const	b,
		const env_size_t	sz,
		intg32 *const	dst
	)

result = a - b

Definition at line 446 of file env_c_math_ops.c.

void env_c_inplace_rectify	(	intg32 *	dst,
		const env_size_t	sz
	)

Saturate values < 0.

Definition at line 305 of file env_c_math_ops.c.

void env_c_lowpass_9_x_fewbits_optim	(	const intg32 *	src,
		const env_size_t	w,
		const env_size_t	h,
		intg32 *	dst
	)

Like env_c_lowpass_9_x_fewbits() but uses optimized filter coefficients.

Definition at line 134 of file env_c_math_ops.c.

void env_c_lowpass_9_y_fewbits_optim	(	const intg32 *	src,
		const env_size_t	w,
		const env_size_t	h,
		intg32 *	dst
	)

Like env_c_lowpass_9_y_fewbits() but uses optimized filter coefficients.

Definition at line 202 of file env_c_math_ops.c.

void env_c_luminance_from_byte	(	const struct env_rgb_pixel *const	src,
		const env_size_t	sz,
		const env_size_t	nbits,
		intg32 *const	dst
	)

get the luminance with nbits of precision of the input image

Definition at line 409 of file env_c_math_ops.c.