#include <stdbool.h>
#include <stdint.h>

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Typedefs
typedef void *	DarkHelpPtr
	The `DarkHelpPtr` type is only used by the `C` and `Python` APIs. More...

Functions
void	Annotate (DarkHelpPtr ptr, const char *const output_image_filename)
	Calls DarkHelp::NN::annotate() on the last image and results from either PredictFN() or Predict(). More...

DarkHelpPtr	CreateDarkHelpNN (const char const fn1, const char const fn2, const char *const fn3)
	Create a DarkHelp::NN object. More...

const char *	DarkHelpVersion ()
	Get the DarkHelp version string, such as `"1.6.1-2"`. More...

const char *	DarknetVersion ()
	Get the "short" Darknet version string, such as `"2.0-78"`. More...

void	DestroyDarkHelpNN (DarkHelpPtr ptr)
	Destroy the neural network object previously created with CreateDarkHelpNN(). More...

bool	EnableAnnotationAutoHideLabels (DarkHelpPtr ptr, bool enabled)
	Enable or disable DarkHelp::Config::annotation_auto_hide_labels. More...

bool	EnableAnnotationIncludeDuration (DarkHelpPtr ptr, bool enabled)
	Enable or disable DarkHelp::Config::annotation_include_duration. More...

bool	EnableAnnotationIncludeTimestamp (DarkHelpPtr ptr, bool enabled)
	Enable or disable DarkHelp::Config::annotation_include_timestamp. More...

bool	EnableAnnotationPixelate (DarkHelpPtr ptr, bool enabled)
	Enable or disable DarkHelp::Config::annotation_pixelate_enabled. More...

bool	EnableAnnotationSuppressAllLabels (DarkHelpPtr ptr, bool enabled)
	Enable or disable DarkHelp::Config::annotation_suppress_all_labels. More...

bool	EnableCombineTilePredictions (DarkHelpPtr ptr, bool enabled)
	Enable or disable DarkHelp::Config::combine_tile_predictions. More...

bool	EnableIncludeAllNames (DarkHelpPtr ptr, bool enabled)
	Enable or disable DarkHelp::Config::include_all_names. More...

bool	EnableNamesIncludePercentage (DarkHelpPtr ptr, bool enabled)
	Enable or disable DarkHelp::Config::names_include_percentage. More...

bool	EnableOnlyCombineSimilarPredictions (DarkHelpPtr ptr, bool enabled)
	Enable or disable DarkHelp::Config::only_combine_similar_predictions. More...

bool	EnableSnapping (DarkHelpPtr ptr, bool enabled)
	Enable or disable DarkHelp::Config::snapping_enabled. More...

bool	EnableTiles (DarkHelpPtr ptr, bool enabled)
	Enable or disable DarkHelp::Config::enable_tiles. More...

bool	EnableUseFastImageResize (DarkHelpPtr ptr, bool enabled)
	Enable or disable DarkHelp::Config::use_fast_image_resize. More...

const char *	GetPredictionResults (DarkHelpPtr ptr)
	Get the last detection results from either PredictFN() or Predict(). More...

int	Predict (DarkHelpPtr ptr, const int width, const int height, uint8_t *image, const int number_of_bytes)
	Calls DarkHelp::NN::predict() with the given image. More...

int	PredictFN (DarkHelpPtr ptr, const char *const image_filename)
	Calls DarkHelp::NN::predict() with the given image filename. More...

double	SetAnnotationFontScale (DarkHelpPtr ptr, double scale)
	Set the font scale to use when annotating predictions. More...

int	SetAnnotationFontThickness (DarkHelpPtr ptr, int thickness)
	Set the font thickness to use when annotating predictions. More...

int	SetAnnotationLineThickness (DarkHelpPtr ptr, int thickness)
	Set the line thickness to use when annotating predictions. More...

int	SetAnnotationPixelateSize (DarkHelpPtr ptr, int size)
	Set the pixelation size to use when EnableAnnotationPixelate() has been enabled. More...

float	SetAnnotationShadePredictions (DarkHelpPtr ptr, float shading)
	Set the amount of shading to use when annotating predictions. More...

int	SetBinaryThresholdBlockSize (DarkHelpPtr ptr, int blocksize)
	Set the value for DarkHelp::Config::binary_threshold_block_size. More...

double	SetBinaryThresholdConstant (DarkHelpPtr ptr, double threshold)
	Set the value for DarkHelp::Config::binary_threshold_constant. More...

float	SetNonMaximalSuppression (DarkHelpPtr ptr, float nms)
	Set the NMS (non maximal suppression) threshold used with `Darknet`. More...

int	SetSnappingHorizontalTolerance (DarkHelpPtr ptr, int tolerance)
	Set the value for DarkHelp::Config::snapping_horizontal_tolerance. More...

float	SetSnappingLimitGrow (DarkHelpPtr ptr, float limit)
	Set the value for DarkHelp::Config::snapping_limit_grow. More...

float	SetSnappingLimitShrink (DarkHelpPtr ptr, float limit)
	Set the value for DarkHelp::Config::snapping_limit_shrink. More...

int	SetSnappingVerticalTolerance (DarkHelpPtr ptr, int tolerance)
	Set the value for DarkHelp::Config::snapping_vertical_tolerance. More...

float	SetThreshold (DarkHelpPtr ptr, float threshold)
	Set the detection threshold used with `Darknet` and `DarkHelp`. More...

float	SetTileEdgeFactor (DarkHelpPtr ptr, float factor)
	Set the value for DarkHelp::Config::tile_edge_factor. More...

float	SetTileRectFactor (DarkHelpPtr ptr, float factor)
	Set the value for DarkHelp::Config::tile_rect_factor. More...

void	ToggleOutputRedirection ()
	Calls DarkHelp::toggle_output_redirection() to either hide or show output on `STDOUT` and `STDERR`. More...

Detailed Description

This is the C API for DarkHelp. It exists primarily to help with the Python bindings. If you have a choice between using the C API and the C++ one, note the C++ API has additional functionality that is not exposed in the C or Python API.

Using the C API is simple:

#include <DarkHelp_C_API.h>
// ...
DarkHelpPtr dh = CreateDarkHelpNN(argv[1], argv[2], argv[3]);
SetThreshold(dh, 0.25);
SetAnnotationLineThickness(dh, 1);
PredictFN(dh, argv[4]);
const char * json = GetPredictionResults(dh);
Annotate(dh, "output.jpg");
DestroyDarkHelpNN(dh);

Typedef Documentation

◆ DarkHelpPtr

typedef void* DarkHelpPtr

The DarkHelpPtr type is only used by the C and Python APIs.

It is a DarkHelp::NN C++ object which has been cast to a generic C-style void* type.

See also: CreateDarkHelpNN(); DestroyDarkHelpNN()

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

Function Documentation

◆ Annotate()

void Annotate	(	DarkHelpPtr	ptr,
		const char *const	output_image_filename
	)

Calls DarkHelp::NN::annotate() on the last image and results from either PredictFN() or Predict().

The results will be saved to output_image_filename in either PNG or JPG format depending on the file extension.

Warning: If the output filename already exists it will be overwritten.

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

References DarkHelp::NN::annotate().

Referenced by main().

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◆ CreateDarkHelpNN()

DarkHelpPtr CreateDarkHelpNN	(	const char *const	fn1,
		const char *const	fn2,
		const char *const	fn3
	)

Create a DarkHelp::NN object.

The order in which the filenames are specified is not important. The files should be the .cfg file, the .names file, and the .weights file.

When done with the neural network, remember to call DestroyDarkHelpNN().

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

Referenced by main().

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◆ DarkHelpVersion()

const char* DarkHelpVersion ( )

Get the DarkHelp version string, such as "1.6.1-2".

See also: DarkHelp::version()

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

References DarkHelp::version().

Referenced by main().

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◆ DarknetVersion()

const char* DarknetVersion ( )

Get the "short" Darknet version string, such as "2.0-78".

See also: DarkHelpVersion()

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

Referenced by main().

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◆ DestroyDarkHelpNN()

void DestroyDarkHelpNN ( DarkHelpPtr ptr )

Destroy the neural network object previously created with CreateDarkHelpNN().

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

Referenced by main().

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◆ EnableAnnotationAutoHideLabels()

bool EnableAnnotationAutoHideLabels	(	DarkHelpPtr	ptr,
		bool	enabled
	)

Enable or disable DarkHelp::Config::annotation_auto_hide_labels.

Returns: the previous value.

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

References DarkHelp::Config::annotation_auto_hide_labels, and DarkHelp::NN::config.

Referenced by main().

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◆ EnableAnnotationIncludeDuration()

bool EnableAnnotationIncludeDuration	(	DarkHelpPtr	ptr,
		bool	enabled
	)

Enable or disable DarkHelp::Config::annotation_include_duration.

Returns: the previous value.

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

References DarkHelp::Config::annotation_include_duration, and DarkHelp::NN::config.

Referenced by main().

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◆ EnableAnnotationIncludeTimestamp()

bool EnableAnnotationIncludeTimestamp	(	DarkHelpPtr	ptr,
		bool	enabled
	)

Enable or disable DarkHelp::Config::annotation_include_timestamp.

Returns: the previous value.

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

References DarkHelp::Config::annotation_include_timestamp, and DarkHelp::NN::config.

Referenced by main().

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◆ EnableAnnotationPixelate()

bool EnableAnnotationPixelate	(	DarkHelpPtr	ptr,
		bool	enabled
	)

Enable or disable DarkHelp::Config::annotation_pixelate_enabled.

Returns: the previous value.

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

References DarkHelp::Config::annotation_pixelate_enabled, and DarkHelp::NN::config.

◆ EnableAnnotationSuppressAllLabels()

bool EnableAnnotationSuppressAllLabels	(	DarkHelpPtr	ptr,
		bool	enabled
	)

Enable or disable DarkHelp::Config::annotation_suppress_all_labels.

Returns: the previous value.

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

References DarkHelp::Config::annotation_suppress_all_labels, and DarkHelp::NN::config.

◆ EnableCombineTilePredictions()

bool EnableCombineTilePredictions	(	DarkHelpPtr	ptr,
		bool	enabled
	)

Enable or disable DarkHelp::Config::combine_tile_predictions.

Returns: the previous value.

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

References DarkHelp::Config::combine_tile_predictions, and DarkHelp::NN::config.

◆ EnableIncludeAllNames()

bool EnableIncludeAllNames	(	DarkHelpPtr	ptr,
		bool	enabled
	)

Enable or disable DarkHelp::Config::include_all_names.

Returns: the previous value.

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

References DarkHelp::NN::config, and DarkHelp::Config::include_all_names.

◆ EnableNamesIncludePercentage()

bool EnableNamesIncludePercentage	(	DarkHelpPtr	ptr,
		bool	enabled
	)

Enable or disable DarkHelp::Config::names_include_percentage.

Returns: the previous value.

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

References DarkHelp::NN::config, and DarkHelp::Config::names_include_percentage.

Referenced by main().

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◆ EnableOnlyCombineSimilarPredictions()

bool EnableOnlyCombineSimilarPredictions	(	DarkHelpPtr	ptr,
		bool	enabled
	)

Enable or disable DarkHelp::Config::only_combine_similar_predictions.

Returns: the previous value.

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

References DarkHelp::NN::config, and DarkHelp::Config::only_combine_similar_predictions.

◆ EnableSnapping()

bool EnableSnapping	(	DarkHelpPtr	ptr,
		bool	enabled
	)

Enable or disable DarkHelp::Config::snapping_enabled.

Returns: the previous value.

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

References DarkHelp::NN::config, and DarkHelp::Config::snapping_enabled.

Referenced by main().

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◆ EnableTiles()

bool EnableTiles	(	DarkHelpPtr	ptr,
		bool	enabled
	)

Enable or disable DarkHelp::Config::enable_tiles.

Returns: the previous value.

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

References DarkHelp::NN::config, and DarkHelp::Config::enable_tiles.

Referenced by main().

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◆ EnableUseFastImageResize()

bool EnableUseFastImageResize	(	DarkHelpPtr	ptr,
		bool	enabled
	)

Enable or disable DarkHelp::Config::use_fast_image_resize.

Returns: the previous value.

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

References DarkHelp::NN::config, and DarkHelp::Config::use_fast_image_resize.

◆ GetPredictionResults()

const char* GetPredictionResults ( DarkHelpPtr ptr )

Get the last detection results from either PredictFN() or Predict().

The results will be formatted as a JSON string.

Warning: The char* buffer used to return the JSON is static, so don't attempt to use this function call simultaneously from multiple threads, otherwise you risk corrupting the returned text or causing strange undefined behaviour.

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

Referenced by main().

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◆ Predict()

int Predict	(	DarkHelpPtr	ptr,
		const int	width,
		const int	height,
		uint8_t *	image,
		const int	number_of_bytes
	)

Calls DarkHelp::NN::predict() with the given image.

The image data is presumed to be similar to OpenCV's cv::Mat objects, meaning the bytes need to be in BGR format, not RGB. The number of channels will automatically be determined by dividing the number of bytes by the width and height.

Returns: the number of predictions made.

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

References DarkHelp::NN::predict(), and DarkHelp::NN::prediction_results.

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◆ PredictFN()

int PredictFN	(	DarkHelpPtr	ptr,
		const char *const	image_filename
	)

Calls DarkHelp::NN::predict() with the given image filename.

Returns: the number of predictions made.

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

References DarkHelp::NN::predict(), and DarkHelp::NN::prediction_results.

Referenced by main().

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◆ SetAnnotationFontScale()

double SetAnnotationFontScale	(	DarkHelpPtr	ptr,
		double	scale
	)

Set the font scale to use when annotating predictions.

See also: DarkHelp::Config::annotation_font_scale

Returns: the previous value.

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

References DarkHelp::Config::annotation_font_scale, and DarkHelp::NN::config.

Referenced by main().

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◆ SetAnnotationFontThickness()

int SetAnnotationFontThickness	(	DarkHelpPtr	ptr,
		int	thickness
	)

Set the font thickness to use when annotating predictions.

See also: DarkHelp::Config::annotation_font_thickness

Returns: the previous value.

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

References DarkHelp::Config::annotation_font_thickness, and DarkHelp::NN::config.

Referenced by main().

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◆ SetAnnotationLineThickness()

int SetAnnotationLineThickness	(	DarkHelpPtr	ptr,
		int	thickness
	)

Set the line thickness to use when annotating predictions.

See also: DarkHelp::Config::annotation_line_thickness

Returns: the previous value.

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

References DarkHelp::Config::annotation_line_thickness, and DarkHelp::NN::config.

Referenced by main().

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◆ SetAnnotationPixelateSize()

int SetAnnotationPixelateSize	(	DarkHelpPtr	ptr,
		int	size
	)

Set the pixelation size to use when EnableAnnotationPixelate() has been enabled.

See also: DarkHelp::Config::annotation_pixelate_size

Returns: the previous value.

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

References DarkHelp::Config::annotation_pixelate_size, and DarkHelp::NN::config.

◆ SetAnnotationShadePredictions()

float SetAnnotationShadePredictions	(	DarkHelpPtr	ptr,
		float	shading
	)

Set the amount of shading to use when annotating predictions.

See also: DarkHelp::Config::annotation_shade_predictions

Returns: the previous value.

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

References DarkHelp::Config::annotation_shade_predictions, and DarkHelp::NN::config.

Referenced by main().

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◆ SetBinaryThresholdBlockSize()

int SetBinaryThresholdBlockSize	(	DarkHelpPtr	ptr,
		int	blocksize
	)

Set the value for DarkHelp::Config::binary_threshold_block_size.

Returns: the previous value.

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

References DarkHelp::Config::binary_threshold_block_size, and DarkHelp::NN::config.

◆ SetBinaryThresholdConstant()

double SetBinaryThresholdConstant	(	DarkHelpPtr	ptr,
		double	threshold
	)

Set the value for DarkHelp::Config::binary_threshold_constant.

Returns: the previous value.

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

References DarkHelp::Config::binary_threshold_constant, and DarkHelp::NN::config.

◆ SetNonMaximalSuppression()

float SetNonMaximalSuppression	(	DarkHelpPtr	ptr,
		float	nms
	)

Set the NMS (non maximal suppression) threshold used with Darknet.

See also: DarkHelp::Config::non_maximal_suppression_threshold

Returns: the previous value.

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

References DarkHelp::NN::config, and DarkHelp::Config::non_maximal_suppression_threshold.

◆ SetSnappingHorizontalTolerance()

int SetSnappingHorizontalTolerance	(	DarkHelpPtr	ptr,
		int	tolerance
	)

Set the value for DarkHelp::Config::snapping_horizontal_tolerance.

Returns: the previous value.

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

References DarkHelp::NN::config, and DarkHelp::Config::snapping_horizontal_tolerance.

◆ SetSnappingLimitGrow()

float SetSnappingLimitGrow	(	DarkHelpPtr	ptr,
		float	limit
	)

Set the value for DarkHelp::Config::snapping_limit_grow.

Returns: the previous value.

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

References DarkHelp::NN::config, and DarkHelp::Config::snapping_limit_grow.

◆ SetSnappingLimitShrink()

float SetSnappingLimitShrink	(	DarkHelpPtr	ptr,
		float	limit
	)

Set the value for DarkHelp::Config::snapping_limit_shrink.

Returns: the previous value.

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

References DarkHelp::NN::config, and DarkHelp::Config::snapping_limit_shrink.

◆ SetSnappingVerticalTolerance()

int SetSnappingVerticalTolerance	(	DarkHelpPtr	ptr,
		int	tolerance
	)

Set the value for DarkHelp::Config::snapping_vertical_tolerance.

Returns: the previous value.

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

References DarkHelp::NN::config, and DarkHelp::Config::snapping_vertical_tolerance.

◆ SetThreshold()

float SetThreshold	(	DarkHelpPtr	ptr,
		float	threshold
	)

Set the detection threshold used with Darknet and DarkHelp.

See also: DarkHelp::Config::threshold

Returns: the previous value.

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

References DarkHelp::NN::config, and DarkHelp::Config::threshold.

Referenced by main().

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◆ SetTileEdgeFactor()

float SetTileEdgeFactor	(	DarkHelpPtr	ptr,
		float	factor
	)

Set the value for DarkHelp::Config::tile_edge_factor.

Returns: the previous value.

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

References DarkHelp::NN::config, and DarkHelp::Config::tile_edge_factor.

◆ SetTileRectFactor()

float SetTileRectFactor	(	DarkHelpPtr	ptr,
		float	factor
	)

Set the value for DarkHelp::Config::tile_rect_factor.

Returns: the previous value.

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

References DarkHelp::NN::config, and DarkHelp::Config::tile_rect_factor.

◆ ToggleOutputRedirection()

void ToggleOutputRedirection ( )

Calls DarkHelp::toggle_output_redirection() to either hide or show output on STDOUT and STDERR.

This can be used to hide the large amount of output generated by Darknet when it first loads a neural network.

Since: December 2023

Note: This is part of the DarkHelp C API, which is a simplified interface to the full DarkHelp C++ API.

References DarkHelp::toggle_output_redirection().

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Typedefs

Functions

Detailed Description

Typedef Documentation

◆ DarkHelpPtr

Function Documentation

◆ Annotate()

◆ CreateDarkHelpNN()

◆ DarkHelpVersion()

◆ DarknetVersion()

◆ DestroyDarkHelpNN()

◆ EnableAnnotationAutoHideLabels()

◆ EnableAnnotationIncludeDuration()

◆ EnableAnnotationIncludeTimestamp()

◆ EnableAnnotationPixelate()

◆ EnableAnnotationSuppressAllLabels()

◆ EnableCombineTilePredictions()

◆ EnableIncludeAllNames()

◆ EnableNamesIncludePercentage()

◆ EnableOnlyCombineSimilarPredictions()

◆ EnableSnapping()

◆ EnableTiles()

◆ EnableUseFastImageResize()

◆ GetPredictionResults()

◆ Predict()

◆ PredictFN()

◆ SetAnnotationFontScale()

◆ SetAnnotationFontThickness()

◆ SetAnnotationLineThickness()

◆ SetAnnotationPixelateSize()

◆ SetAnnotationShadePredictions()

◆ SetBinaryThresholdBlockSize()

◆ SetBinaryThresholdConstant()

◆ SetNonMaximalSuppression()

◆ SetSnappingHorizontalTolerance()

◆ SetSnappingLimitGrow()

◆ SetSnappingLimitShrink()

◆ SetSnappingVerticalTolerance()

◆ SetThreshold()

◆ SetTileEdgeFactor()

◆ SetTileRectFactor()

◆ ToggleOutputRedirection()