Pixel Channel Mapping. More...

Collaboration diagram for Pixel Channel Mapping:

Macros
#define	ARGUS_PIXELS_X 8
	The device pixel field size in x direction (long edge).

#define	ARGUS_PIXELS_Y 4
	The device pixel field size in y direction (short edge).

#define	ARGUS_PIXELS ((ARGUS_PIXELS_X)*(ARGUS_PIXELS_Y))
	The total device pixel count.

#define	PIXEL_XY2CH(x, y) ((((y) << 3U) & 0x10U) \| (((x) ^ 0x07U) << 1U) \| ((y) & 0x01U))
	Macro to determine the pixel ADC channel number from the x-z-indices.

#define	PIXEL_CH2X(c) ((((c) >> 1U) ^ 0x07U) & 0x07U)
	Macro to determine the pixel x-index from the ADC channel number.

#define	PIXEL_CH2Y(c) ((((c) >> 3U) & 0x02U) \| ((c) & 0x01U))
	Macro to determine the pixel y-index from the ADC channel number.

#define	PIXEL_XY2N(x, y) (((x) << 2U) \| (y))
	Macro to determine the n-index from the x-y-indices.

#define	PIXEL_N2X(n) ((n) >> 2U)
	Macro to determine the pixel x-index from the n-index.

#define	PIXEL_N2Y(n) ((n) & 0x03U)
	Macro to determine the pixel y-index from the n-index.

#define	PIXEL_N2CH(n) ((((n) << 3U) & 0x10U) \| ((((n) >> 1U) ^ 0x0EU) & 0x0EU) \| ((n) & 0x01U))
	Macro to determine the pixel n-index from the ADC channel number.

#define	PIXEL_CH2N(c) (((((c) << 1U) ^ 0x1CU) & 0x1CU) \| (((c) >> 3U) & 0x02U) \| ((c) & 0x01U))
	Macro to determine the pixel.

#define	PIXELN_MASK(n) (0x01U << (n))
	Macro to create a pixel mask given by the pixels n-index.

#define	PIXELN_ISENABLED(msk, n) (((msk) >> (n)) & 0x01U)
	Macro to determine if a pixel given by the n-index is enabled in a pixel mask.

#define	PIXELN_ENABLE(msk, n) ((msk) \|= (PIXELN_MASK(n)))
	Macro to enable a pixel given by the n-index in a pixel mask.

#define	PIXELN_DISABLE(msk, n) ((msk) &= (~PIXELN_MASK(n)))
	Macro disable a pixel given by the n-index in a pixel mask.

#define	PIXELCH_MASK(c) (0x01U << (PIXEL_CH2N(c)))
	Macro to create a pixel mask given by the pixels ADC channel number.

#define	PIXELCH_ISENABLED(msk, c) (PIXELN_ISENABLED(msk, PIXEL_CH2N(c)))
	Macro to determine if an ADC pixel channel is enabled from a pixel mask.

#define	PIXELCH_ENABLE(msk, c) (PIXELN_ENABLE(msk, PIXEL_CH2N(c)))
	Macro to enable an ADC pixel channel in a pixel mask.

#define	PIXELCH_DISABLE(msk, c) (PIXELN_DISABLE(msk, PIXEL_CH2N(c)))
	Macro to disable an ADC pixel channel in a pixel mask.

#define	PIXELXY_MASK(x, y) (0x01U << (PIXEL_XY2N(x, y)))
	Macro to create a pixel mask given by the pixel x-y-indices.

#define	PIXELXY_ISENABLED(msk, x, y) (PIXELN_ISENABLED(msk, PIXEL_XY2N(x, y)))
	Macro to determine if a pixel given by the x-y-indices is enabled in a pixel mask.

#define	PIXELXY_ENABLE(msk, x, y) (PIXELN_ENABLE(msk, PIXEL_XY2N(x, y)))
	Macro to enable a pixel given by the x-y-indices in a pixel mask.

#define	PIXELXY_DISABLE(msk, x, y) (PIXELN_DISABLE(msk, PIXEL_XY2N(x, y)))
	Macro disable a pixel given by the x-y-indices in a pixel mask.

#define	CHANNELN_ISENABLED(msk, ch) (((msk) >> ((ch) - 32U)) & 0x01U)
	Macro to determine if an ADC channel is enabled in a channel mask.

#define	CHANNELN_ENABLE(msk, ch) ((msk) \|= (0x01U << ((ch) - 32U)))
	Macro to determine if an ADC channel is enabled in a channel mask.

#define	CHANNELN_DISABLE(msk, ch) ((msk) &= (~(0x01U << ((ch) - 32U))))
	Macro to determine if an ADC channel is disabled in a channel mask.

#define	PIXEL_COUNT(pxmsk) popcount(pxmsk)
	Macro to determine the number of enabled pixel/channels in a mask via a popcount algorithm.

#define	CHANNEL_COUNT(pxmsk, chmsk) (popcount(pxmsk) + popcount(chmsk))
	Macro to determine the number of enabled channels via a popcount algorithm.

Functions
static uint32_t	ChannelToPixelMask (uint32_t msk)
	Converts a raw ADC channel mask to a x-y-sorted pixel mask.

static uint32_t	PixelToChannelMask (uint32_t msk)
	Converts a x-y-sorted pixel mask to a raw ADC channel mask.

static uint32_t	ShiftSelectedPixels (const uint32_t pixel_mask, const int8_t dx, const int8_t dy, const uint8_t center_y)
	Shifts a pixel mask by a given offset.

static uint32_t	FillPixelMask (uint32_t pixel_mask, const uint8_t pixel_count, const uint8_t center_x, const uint8_t center_y)
	Fills a pixel mask to a specified number of pixels around a center pixel.

static uint32_t	GetAdjacentPixelsMask (const uint_fast8_t x, const uint_fast8_t y)
	Fills a pixel mask with the direct neighboring pixels around a pixel.

Detailed Description

Pixel Channel Mapping.

The ADC Channels of each pixel or auxiliary channel on the device are numbered in a way that is convenient on the chip architecture. The macros in this module are defined in order to map between the chip internal channel number (ch) to the two-dimensional x-y-indices or one-dimensional n-index representation.

Macro Definition Documentation

◆ ARGUS_PIXELS

#define ARGUS_PIXELS ((ARGUS_PIXELS_X)*(ARGUS_PIXELS_Y))

The total device pixel count.

◆ ARGUS_PIXELS_X

#define ARGUS_PIXELS_X 8

The device pixel field size in x direction (long edge).

◆ ARGUS_PIXELS_Y

#define ARGUS_PIXELS_Y 4

The device pixel field size in y direction (short edge).

◆ CHANNEL_COUNT

#define CHANNEL_COUNT	(	pxmsk,
		chmsk
	)	(popcount(pxmsk) + popcount(chmsk))

Macro to determine the number of enabled channels via a popcount algorithm.

Parameters

pxmsk	32-bit pixel mask
chmsk	32-bit channel mask

Returns: The count of enabled ADC channels.

◆ CHANNELN_DISABLE

#define CHANNELN_DISABLE	(	msk,
		ch
	)	((msk) &= (~(0x01U << ((ch) - 32U))))

Macro to determine if an ADC channel is disabled in a channel mask.

Parameters

msk	32-bit channel mask
ch	channel number of the ADC channel to disable.

◆ CHANNELN_ENABLE

#define CHANNELN_ENABLE	(	msk,
		ch
	)	((msk) \|= (0x01U << ((ch) - 32U)))

Macro to determine if an ADC channel is enabled in a channel mask.

Parameters

msk	32-bit channel mask
ch	channel number of the ADC channel to enabled.

◆ CHANNELN_ISENABLED

#define CHANNELN_ISENABLED	(	msk,
		ch
	)	(((msk) >> ((ch) - 32U)) & 0x01U)

Macro to determine if an ADC channel is enabled in a channel mask.

Parameters

msk	32-bit channel mask
ch	channel number of the ADC channel.

Returns: True if the ADC channel is enabled.

◆ PIXEL_CH2N

#define PIXEL_CH2N ( c ) (((((c) << 1U) ^ 0x1CU) & 0x1CU) | (((c) >> 3U) & 0x02U) | ((c) & 0x01U))

Macro to determine the pixel.

Parameters

c	The ADC channel number of the pixel.

Returns: The n-index of the pixel.

◆ PIXEL_CH2X

#define PIXEL_CH2X ( c ) ((((c) >> 1U) ^ 0x07U) & 0x07U)

Macro to determine the pixel x-index from the ADC channel number.

Parameters

c	The ADC channel number of the pixel.

Returns: The x-index of the pixel.

◆ PIXEL_CH2Y

#define PIXEL_CH2Y ( c ) ((((c) >> 3U) & 0x02U) | ((c) & 0x01U))

Macro to determine the pixel y-index from the ADC channel number.

Parameters

c	The ADC channel number of the pixel.

Returns: The y-index of the pixel.

◆ PIXEL_COUNT

#define PIXEL_COUNT ( pxmsk ) popcount(pxmsk)

Macro to determine the number of enabled pixel/channels in a mask via a popcount algorithm.

Parameters

pxmsk 32-bit pixel mask

Returns: The count of enabled pixel channels.

◆ PIXEL_N2CH

#define PIXEL_N2CH ( n ) ((((n) << 3U) & 0x10U) | ((((n) >> 1U) ^ 0x0EU) & 0x0EU) | ((n) & 0x01U))

Macro to determine the pixel n-index from the ADC channel number.

Parameters

n	The n-index of the pixel.

Returns: The ADC channel number of the pixel.

◆ PIXEL_N2X

#define PIXEL_N2X ( n ) ((n) >> 2U)

Macro to determine the pixel x-index from the n-index.

Parameters

n	The n-index of the pixel.

Returns: The x-index number of the pixel.

◆ PIXEL_N2Y

#define PIXEL_N2Y ( n ) ((n) & 0x03U)

Macro to determine the pixel y-index from the n-index.

Parameters

n	The n-index of the pixel.

Returns: The y-index number of the pixel.

◆ PIXEL_XY2CH

#define PIXEL_XY2CH	(	x,
		y
	)	((((y) << 3U) & 0x10U) \| (((x) ^ 0x07U) << 1U) \| ((y) & 0x01U))

Macro to determine the pixel ADC channel number from the x-z-indices.

Parameters

x	The x-index of the pixel.
y	The y-index of the pixel.

Returns: The ADC channel number of the pixel.

◆ PIXEL_XY2N

#define PIXEL_XY2N	(	x,
		y
	)	(((x) << 2U) \| (y))

Macro to determine the n-index from the x-y-indices.

Parameters

x	The x-index of the pixel.
y	The y-index of the pixel.

Returns: The n-index of the pixel.

◆ PIXELCH_DISABLE

#define PIXELCH_DISABLE	(	msk,
		c
	)	(PIXELN_DISABLE(msk, PIXEL_CH2N(c)))

Macro to disable an ADC pixel channel in a pixel mask.

Parameters

msk	The 32-bit pixel mask
c	The pixel ADC channel number to disable.

◆ PIXELCH_ENABLE

#define PIXELCH_ENABLE	(	msk,
		c
	)	(PIXELN_ENABLE(msk, PIXEL_CH2N(c)))

Macro to enable an ADC pixel channel in a pixel mask.

Parameters

msk	The 32-bit pixel mask
c	The pixel ADC channel number to enable.

◆ PIXELCH_ISENABLED

#define PIXELCH_ISENABLED	(	msk,
		c
	)	(PIXELN_ISENABLED(msk, PIXEL_CH2N(c)))

Macro to determine if an ADC pixel channel is enabled from a pixel mask.

Parameters

msk	The 32-bit pixel mask
c	The ADC channel number of the pixel.

Returns: True if the specified pixel ADC channel is enabled.

◆ PIXELCH_MASK

#define PIXELCH_MASK ( c ) (0x01U << (PIXEL_CH2N(c)))

Macro to create a pixel mask given by the pixels ADC channel number.

Parameters

c	The ADC channel number of the pixel.

Returns: The 32-bit pixel mask with only pixel ADC channel set.

◆ PIXELN_DISABLE

#define PIXELN_DISABLE	(	msk,
		n
	)	((msk) &= (~PIXELN_MASK(n)))

Macro disable a pixel given by the n-index in a pixel mask.

Parameters

msk	32-bit pixel mask
n	n-index of the pixel to disable.

◆ PIXELN_ENABLE

#define PIXELN_ENABLE	(	msk,
		n
	)	((msk) \|= (PIXELN_MASK(n)))

Macro to enable a pixel given by the n-index in a pixel mask.

Parameters

msk	32-bit pixel mask
n	n-index of the pixel to enable.

◆ PIXELN_ISENABLED

#define PIXELN_ISENABLED	(	msk,
		n
	)	(((msk) >> (n)) & 0x01U)

Macro to determine if a pixel given by the n-index is enabled in a pixel mask.

Parameters

msk	32-bit pixel mask
n	n-index of the pixel.

Returns: True if the pixel (n) is enabled.

◆ PIXELN_MASK

#define PIXELN_MASK ( n ) (0x01U << (n))

Macro to create a pixel mask given by the pixels n-index.

Parameters

n	n-index of the pixel.

Returns: The pixel mask with only n-index pixel set.

◆ PIXELXY_DISABLE

#define PIXELXY_DISABLE	(	msk,
		x,
		y
	)	(PIXELN_DISABLE(msk, PIXEL_XY2N(x, y)))

Macro disable a pixel given by the x-y-indices in a pixel mask.

Parameters

msk	32-bit pixel mask
x	x-index of the pixel to disable.
y	y-index of the pixel to disable.

◆ PIXELXY_ENABLE

#define PIXELXY_ENABLE	(	msk,
		x,
		y
	)	(PIXELN_ENABLE(msk, PIXEL_XY2N(x, y)))

Macro to enable a pixel given by the x-y-indices in a pixel mask.

Parameters

msk	32-bit pixel mask
x	x-index of the pixel to enable.
y	y-index of the pixel to enable.

◆ PIXELXY_ISENABLED

#define PIXELXY_ISENABLED	(	msk,
		x,
		y
	)	(PIXELN_ISENABLED(msk, PIXEL_XY2N(x, y)))

Macro to determine if a pixel given by the x-y-indices is enabled in a pixel mask.

Parameters

msk	32-bit pixel mask
x	x-index of the pixel.
y	y-index of the pixel.

Returns: True if the pixel (x,y) is enabled.

◆ PIXELXY_MASK

#define PIXELXY_MASK	(	x,
		y
	)	(0x01U << (PIXEL_XY2N(x, y)))

Macro to create a pixel mask given by the pixel x-y-indices.

Parameters

x	x-index of the pixel.
y	y-index of the pixel.

Returns: The 32-bit pixel mask with only pixel ADC channel set.

Function Documentation

◆ ChannelToPixelMask()

static uint32_t ChannelToPixelMask ( uint32_t msk )

inlinestatic

Converts a raw ADC channel mask to a x-y-sorted pixel mask.

Parameters

msk	The raw ADC channel mask to be converted.

Returns: The converted x-y-sorted pixel mask.

◆ FillPixelMask()

static uint32_t FillPixelMask	(	uint32_t	pixel_mask,
		const uint8_t	pixel_count,
		const uint8_t	center_x,
		const uint8_t	center_y
	)

inlinestatic

Fills a pixel mask to a specified number of pixels around a center pixel.

The pixel mask is iteratively filled with the nearest pixel to a specified center pixel until a specified number of pixels is achieved. The distance between two pixel is determined via a quadratic metric, i.e. dx^2 + dy^2. Pixels towards the lower x indices are preferred.

Note that the distance of only calculated approximately, e.g. the y distance of pixels is considered to be 2 instead of cos(60)*2.

Nothing is done if the number of pixels already exceeds the specified /p pixel_count parameter.

See also: Please also refer to the function Argus_GetCalibrationGoldenPixel to obtain the current Golden Pixel location.

Parameters

pixel_mask	The x-y-sorted pixel mask to be filled with pixels.
pixel_count	The final number of pixels in the pixel mask.
center_x	The center pixel x-index.
center_y	The center pixel y-index.

Returns: The filled pixel mask with at least /p pixel_count pixels selected.

◆ GetAdjacentPixelsMask()

static uint32_t GetAdjacentPixelsMask	(	const uint_fast8_t	x,
		const uint_fast8_t	y
	)

inlinestatic

Fills a pixel mask with the direct neighboring pixels around a pixel.

The pixel mask is iteratively filled with the direct neighbors of the specified center pixel.

Note that the function is able to handle corner and edge pixels and also to handle odd/even lines (which have different layouts)

Parameters

x	The selected pixel x-index.
y	The selected pixel y-index.

Returns: The filled pixel mask with all direct neighbors of the selected pixel.

◆ PixelToChannelMask()

static uint32_t PixelToChannelMask ( uint32_t msk )

inlinestatic

Converts a x-y-sorted pixel mask to a raw ADC channel mask.

Parameters

msk	The x-y-sorted pixel channel mask to be converted.

Returns: The converted raw ADC channel mask.

◆ ShiftSelectedPixels()

static uint32_t ShiftSelectedPixels	(	const uint32_t	pixel_mask,
		const int8_t	dx,
		const int8_t	dy,
		const uint8_t	center_y
	)

inlinestatic

Shifts a pixel mask by a given offset.

This moves the selected pixel pattern by a specified number of pixels in x and y direction. If the shift in y direction is odd (e.g +1), the pattern will be shifted by +0.5 or -0.5 in x direction due to the hexagonal shape of the pixel field. Thus, a center pixel (usually the Golden Pixel) is determined that is used to determine if the pattern is shifted by +0.5 or -0.5 pixels in x direction. The center pixel is then always shifted without changing the x index and the surrounding pixels are adopting its x index accordingly.

Example: Consider the flower pattern, i.e. the Golden Pixel (e.g. 5/2) is selected and all is direct neighbors (i.e. 5/1, 6/1, 6/2, 6/3, 5/3, 4/2). If the pattern is shifted by -1 in y direction, the new Golden Pixel would be 5/1. Now all surrounding pixels are selected, namely 4/0, 4/1, 4/2, 5/0, 5/2, 6/1). This yields again the flower around the Golden Pixel.

Thus, the pixels can not all be shifted by the same dx/dy values due to the hexagonal shape of the pixel field, e.g. the upper right neighbor of 5/2 is 5/1 but the upper right neighbor of 5/1 is NOT 5/0 but 4/0! This happens only if the shift in y direction is an odd number. The algorithm to determine new indices is as follows:

If the shift in y direction is even (e.g. +2, -2), no compensation of the hexagonal shape is needed; skip compensation, simply add/subtract indices.
If the center pixel y index is even, pixels that will have even y index after the shift will be additionally shifted by -1 in x direction.
If the center pixel y index is odd, pixel that will have odd y index after the shift will be additionally shifted by +1 in x direction.

See also: Please also refer to the function Argus_GetCalibrationGoldenPixel to obtain the current Golden Pixel location.

Parameters

pixel_mask	The x-y-sorted pixel mask to be shifted.
dx	The number of pixel to shift in x direction.
dy	The number of pixel to shift in y direction.
center_y	The center y index of the pattern that is shifted.

Returns: The shifted pixel mask.

Macros

Functions

Detailed Description

Macro Definition Documentation

◆ ARGUS_PIXELS

◆ ARGUS_PIXELS_X

◆ ARGUS_PIXELS_Y

◆ CHANNEL_COUNT

◆ CHANNELN_DISABLE

◆ CHANNELN_ENABLE

◆ CHANNELN_ISENABLED

◆ PIXEL_CH2N

◆ PIXEL_CH2X

◆ PIXEL_CH2Y

◆ PIXEL_COUNT

◆ PIXEL_N2CH

◆ PIXEL_N2X

◆ PIXEL_N2Y

◆ PIXEL_XY2CH

◆ PIXEL_XY2N

◆ PIXELCH_DISABLE

◆ PIXELCH_ENABLE

◆ PIXELCH_ISENABLED

◆ PIXELCH_MASK

◆ PIXELN_DISABLE

◆ PIXELN_ENABLE

◆ PIXELN_ISENABLED

◆ PIXELN_MASK

◆ PIXELXY_DISABLE

◆ PIXELXY_ENABLE

◆ PIXELXY_ISENABLED

◆ PIXELXY_MASK

Function Documentation

◆ ChannelToPixelMask()

◆ FillPixelMask()

◆ GetAdjacentPixelsMask()

◆ PixelToChannelMask()

◆ ShiftSelectedPixels()