Color Transformations

Functions
void	arm_bgr_8U3C_to_gray8 (const arm_cv_image_bgr_8U3C_t *ImageIn, arm_cv_image_gray8_t *ImageOut)
	Unpacked BGR 8U3C to Grayscale.
void	arm_bgr_8U3C_to_rgb24 (const arm_cv_image_bgr_8U3C_t *ImageIn, arm_cv_image_rgb24_t *ImageOut)
	Unpacked BGR 8U3C to RGB24.
void	arm_gray8_to_rgb24 (const arm_cv_image_gray8_t *ImageIn, arm_cv_image_rgb24_t *ImageOut)
	Grayscale to RGB24.
void	arm_rgb24_to_gray8 (const arm_cv_image_rgb24_t *ImageIn, arm_cv_image_gray8_t *ImageOut)
	RGB24 to Grayscale.
void	arm_yuv420_to_gray8 (const arm_cv_image_yuv420_t *ImageIn, arm_cv_image_gray8_t *ImageOut)
	YUV420 to Grayscale.
void	arm_yuv420_to_rgb24 (const arm_cv_image_yuv420_t *ImageIn, arm_cv_image_rgb24_t *ImageOut)
	YUV420 to packed RGB24.

Description

Function Documentation

arm_bgr_8U3C_to_gray8()

void arm_bgr_8U3C_to_gray8	(	const arm_cv_image_bgr_8U3C_t *	ImageIn,
		arm_cv_image_gray8_t *	ImageOut
	)

Unpacked BGR 8U3C to Grayscale.

Parameters

[in]	ImageIn	The input image
	ImageOut	The output image

Formula used

\[ gray = 0.299 * red + 0.587 * green + 0.114 * blue ; \]

arm_bgr_8U3C_to_rgb24()

void arm_bgr_8U3C_to_rgb24	(	const arm_cv_image_bgr_8U3C_t *	ImageIn,
		arm_cv_image_rgb24_t *	ImageOut
	)

Unpacked BGR 8U3C to RGB24.

Parameters

[in]	ImageIn	The input image
	ImageOut	The output image

arm_gray8_to_rgb24()

void arm_gray8_to_rgb24	(	const arm_cv_image_gray8_t *	ImageIn,
		arm_cv_image_rgb24_t *	ImageOut
	)

Grayscale to RGB24.

Parameters

[in]	ImageIn	The input image
	ImageOut	The output image

arm_rgb24_to_gray8()

void arm_rgb24_to_gray8	(	const arm_cv_image_rgb24_t *	ImageIn,
		arm_cv_image_gray8_t *	ImageOut
	)

RGB24 to Grayscale.

Parameters

[in]	ImageIn	The input image
	ImageOut	The output image

Formula used

\[ gray = 0.299 * red + 0.587 * green + 0.114 * blue ; \]

arm_yuv420_to_gray8()

void arm_yuv420_to_gray8	(	const arm_cv_image_yuv420_t *	ImageIn,
		arm_cv_image_gray8_t *	ImageOut
	)

YUV420 to Grayscale.

Parameters

[in]	ImageIn	The input image
	ImageOut	The output image

YUV Format

Y,U and V are in different planes with different dimensions

arm_yuv420_to_rgb24()

void arm_yuv420_to_rgb24	(	const arm_cv_image_yuv420_t *	ImageIn,
		arm_cv_image_rgb24_t *	ImageOut
	)

YUV420 to packed RGB24.

Parameters

[in]	ImageIn	The input image
	ImageOut	The output image

YUV format

Y,U and V are in different planes with different dimensions

Details about the transform ITU-R BT.601

\[ r = 1.16414 * (y-16) - 0.0017889 * (u-128) + 1.59579 * (v-128) \\ g = 1.16414 * (y-16) - 0.391443 * (u-128) - 0.813482 * (v-128) \\ b = 1.16414 * (y-16) + 2.01783 * (u-128) - 0.00124584 * (v-128) \\ \]