darknet_image.cpp File Reference

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Functions
Darknet::Image	collapse_images_horz (const Darknet::Image *ims, int n)
int	compare_by_lefts (const void *a_ptr, const void *b_ptr)
int	compare_by_probs (const void *a_ptr, const void *b_ptr)
void	copy_image_from_bytes (DarknetImage im, char *pdata)
	This is part of the original C API. Convert from data pointer to a Darknet image. Used by the Python API.
void	free_image (image im)
	This is part of the original C API.
detection_with_class *	get_actual_detections (const Darknet::Detection *dets, int dets_num, float thresh, int *selected_detections_num, const Darknet::VStr &names)
	Creates array of detections with prob > thresh and fills best_class for them Return number of selected detections in *selected_detections_num.
Darknet::Image	get_opencv_label (const std::string &str, const int area)
DarknetImage	load_image_v2 (const char *filename, int desired_width, int desired_height, int channels)
	This is part of the original C API. This function exists for the Python API.
DarknetImage	make_empty_image (int w, int h, int c)
	This is part of the original C API.
DarknetImage	make_image (int w, int h, int c)
	This is part of the original C API.
void	translate_image (Darknet::Image m, float s)

Function Documentation

collapse_images_horz()

Darknet::Image collapse_images_horz	(	const Darknet::Image *	ims,
		int	n
	)

Todo:

COLOR

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compare_by_lefts()

int compare_by_lefts	(	const void *	a_ptr,
		const void *	b_ptr
	)

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compare_by_probs()

int compare_by_probs	(	const void *	a_ptr,
		const void *	b_ptr
	)

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copy_image_from_bytes()

void copy_image_from_bytes	(	DarknetImage	im,
		char *	pdata
	)

This is part of the original C API. Convert from data pointer to a Darknet image. Used by the Python API.

free_image()

void free_image

(

image

im

)

This is part of the original C API.

Free the data pointer that stores the image . All image objects must eventually call either this function or Darknet::free_image() to prevent memory leaks.

See also

Darknet::free_image()

Note

The image is passed by value, meaning that the data pointer in the caller's copy of the image will be left dangling. Be careful not to reference it once this call returns. Where possible when using C++, call Darknet::free_image() instead.

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get_actual_detections()

detection_with_class * get_actual_detections	(	const Darknet::Detection *	dets,
		int	dets_num,
		float	thresh,
		int *	selected_detections_num,
		const Darknet::VStr &	names
	)

Creates array of detections with prob > thresh and fills best_class for them Return number of selected detections in *selected_detections_num.

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get_opencv_label()

Darknet::Image get_opencv_label	(	const std::string &	str,
		const int	area
	)

Todo:

what are the performance implications of LINE_AA over LINE_4 or LINE_8?

Todo:

2025-04-23: should this be rgb or bgr?

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load_image_v2()

DarknetImage load_image_v2	(	const char *	filename,
		int	desired_width,
		int	desired_height,
		int	channels
	)

This is part of the original C API. This function exists for the Python API.

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make_empty_image()

DarknetImage make_empty_image	(	int	w,
		int	h,
		int	c
	)

This is part of the original C API.

Make an empty image with the given dimensions. The data pointer will be nullptr.

See also

free_image()

make_image()

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make_image()

DarknetImage make_image	(	int	w,
		int	h,
		int	c
	)

This is part of the original C API.

Similar to make_empty_image() but the data pointer is fully allocated.

See also

free_image()

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translate_image()

void translate_image	(	Darknet::Image	m,
		float	s
	)