Jetson Linux API Reference

32.6.1 Release

 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Macros Groups Pages
Argus::Ext::IBayerAverageMap Class Referenceabstract

Detailed Description

Interface to Bayer average map metadata.

The Bayer average map provides local averages of the capture's raw pixels for a number of small rectangular regions, called bins, that are evenly distributed across the image. Each average is a floating-point value that is nomalized such that [0.0, 1.0] maps to the full optical range of the output pixels, but values outside this range may be included in the averages so long as they are within the working range of the average calculation. For pixels that have values outside the working range, the API excludes such pixels from the average calculation and increments the clipped pixel counter for the containing region.

See also
IBayerAverageMap::getWorkingRange()
IBayerAverageMap::getClipCounts()

The size and layout of the bins used to calculate the averages are determined by the Argus implementation and are illustrated in the following diagram. The bin size and interval are constant across the image, and are positioned such that the generated averages cover the majority of the full image. All dimensions are given in pixels.

start.x interval.width
_______ _________________
| | | |
_ ________________________________________________________
| | |
start.y | | |
|_ | _____ _____ _____ | _
| | | | | | | | |
| | 0,0 | | 1,0 | | 2,0 | | |
| |_____| |_____| |_____| | |
| | | interval.height
| | |
| | |
| _____ _____ _____ | _|
| | | | | | | |
| | 0,1 | | 1,1 | | 2,1 | |
| |_____| |_____| |_____| |
| |
| |
| |
| _____ _____ _____ | _
| | | | | | | | |
| | 0,2 | | 1,2 | | 2,2 | | | size.height
| |_____| |_____| |_____| | _|
| |
| |
|________________________________________________________|
|_____|
size.width

Definition at line 153 of file BayerAverageMap.h.

Inheritance diagram for Argus::Ext::IBayerAverageMap:
Collaboration diagram for Argus::Ext::IBayerAverageMap:

Public Member Functions

virtual Point2D< uint32_t > getBinStart () const =0
 Returns the starting location of the first bin, in pixels, where the location is relative to the top-left corner of the image. More...
 
virtual Size2D< uint32_t > getBinSize () const =0
 Returns the size of each bin, in pixels. More...
 
virtual Size2D< uint32_t > getBinCount () const =0
 Returns the number of bins in both the horizontal (width) and vertical (height) directions. More...
 
virtual Size2D< uint32_t > getBinInterval () const =0
 Returns the bin intervals for both the x and y axis. More...
 
virtual Range< float > getWorkingRange () const =0
 Returns the working range of the averaging calculation. More...
 
virtual Status getAverages (Array2D< BayerTuple< float > > *averages) const =0
 Returns the average values for all bins. More...
 
virtual Status getClipCounts (Array2D< BayerTuple< uint32_t > > *clipCounts) const =0
 Returns the clipped pixel counts for all bins. More...
 

Static Public Member Functions

static const InterfaceIDid ()
 

Protected Member Functions

 ~IBayerAverageMap ()
 

Constructor & Destructor Documentation

Argus::Ext::IBayerAverageMap::~IBayerAverageMap ( )
inlineprotected

Definition at line 229 of file BayerAverageMap.h.

Member Function Documentation

virtual Status Argus::Ext::IBayerAverageMap::getAverages ( Array2D< BayerTuple< float > > *  averages) const
pure virtual

Returns the average values for all bins.

These values are normalized such that [0.0, 1.0] maps to the optical range of the output, but the range of possible values is determined by the working range. For input pixels that have values outside the working range, the API excludes such pixels from the average calculation and increments the clipped pixel counter for the containing region.

See also
IBayerAverageMap::getWorkingRange()
IBayerAverageMap::getClipCounts()
Parameters
[out]averagesThe output array to store the averages for all bins. This 2-dimensional array is sized as returned by IBayerAverageMap::getBinCount(), where each array element is a floating point BayerTuple containing the R, G_EVEN, G_ODD, and B averages for that bin.
virtual Size2D<uint32_t> Argus::Ext::IBayerAverageMap::getBinCount ( ) const
pure virtual

Returns the number of bins in both the horizontal (width) and vertical (height) directions.

This size is equivalent to the array dimensions for the output from IBayerAverageMap::getAverages() or IBayerAverageMap::getClipCounts().

virtual Size2D<uint32_t> Argus::Ext::IBayerAverageMap::getBinInterval ( ) const
pure virtual

Returns the bin intervals for both the x and y axis.

These intervals are defined as the number of pixels between the first pixel of a bin and that of the immediate next bin.

virtual Size2D<uint32_t> Argus::Ext::IBayerAverageMap::getBinSize ( ) const
pure virtual

Returns the size of each bin, in pixels.

virtual Point2D<uint32_t> Argus::Ext::IBayerAverageMap::getBinStart ( ) const
pure virtual

Returns the starting location of the first bin, in pixels, where the location is relative to the top-left corner of the image.

virtual Status Argus::Ext::IBayerAverageMap::getClipCounts ( Array2D< BayerTuple< uint32_t > > *  clipCounts) const
pure virtual

Returns the clipped pixel counts for all bins.

This is the number of pixels in the bin whose value exceeds the working range and have been excluded from average calculation.

See also
IBayerAverageMap::getWorkingRange()
Parameters
[out]clipCountsThe output array to store the clip counts for all bins. This 2-dimensional array is sized as returned by Ext::IBayerAverageMap::getBinCount(), where each array element is an uint32_t BayerTuple containing the R, G_EVEN, G_ODD, and B clip counts for that bin.
virtual Range<float> Argus::Ext::IBayerAverageMap::getWorkingRange ( ) const
pure virtual

Returns the working range of the averaging calculation.

The working range is defined as the range of values that are included in the average calculation (e.g. not clipped), and may extend beyond the normalized [0.0, 1.0] range of the optical output. For example, if the working range is [-0.5, 1.5], this means that values in [-0.5, 0) and (1, 1.5] will still be included in the average calculation despite being clipped to [0.0, 1.0] in the output pixels. Any pixels outside this working range are excluded from average calculation and will increment the clip count.

See also
IBayerAverageMap::getClipCounts()
Note
When the bit depth available for averaging is equal to the optical bit depth of the output, the working range will be less than the full [0.0, 1.0] optical range. For example, when 10 bits of data are available, the raw output pixels in [0u, 1023u] will map to [0.0, 1.0]; however, the values of 0 and 1023 will be considered clipped for the sake of average calculation, and so the working range would be [1/1023.0, 1022/1023.0].
static const InterfaceID& Argus::Ext::IBayerAverageMap::id ( )
inlinestatic

Definition at line 156 of file BayerAverageMap.h.


The documentation for this class was generated from the following file: