#include <Leap.h>
Public Types | |
| enum | FormatType { INFRARED = 0 } |
Public Member Functions | |
| def | __eq__ (self, arg2) |
| def | __init__ (self) |
| def | __ne__ (self, arg2) |
| def | __str__ (self) |
| LEAP_EXPORT int | bytesPerPixel () const |
| def | data (self, dst) |
| def | data (self) |
| LEAP_EXPORT const unsigned char * | data () const |
| void | data (unsigned char *dst) const |
| void * | dataPointer () const |
| def | distortion (self, dst) |
| def | distortion (self) |
| LEAP_EXPORT const float * | distortion () const |
| void | distortion (float *dst) const |
| LEAP_EXPORT int | distortionHeight () const |
| void * | distortionPointer () const |
| LEAP_EXPORT int | distortionWidth () const |
| LEAP_EXPORT FormatType | format () const |
| LEAP_EXPORT int | height () const |
| LEAP_EXPORT int32_t | id () const |
| Image (ImageImplementation *) | |
| LEAP_EXPORT | Image () |
| LEAP_EXPORT bool | isValid () const |
| LEAP_EXPORT bool | operator!= (const Image &) const |
| LEAP_EXPORT bool | operator== (const Image &) const |
| LEAP_EXPORT float | rayOffsetX () const |
| LEAP_EXPORT float | rayOffsetY () const |
| LEAP_EXPORT float | rayScaleX () const |
| LEAP_EXPORT float | rayScaleY () const |
| def | rectify (self, uv) |
| LEAP_EXPORT Vector | rectify (const Vector &uv) const |
| LEAP_EXPORT int64_t | sequenceId () const |
| LEAP_EXPORT int64_t | timestamp () const |
| std::string | toString () const |
| def | warp (self, xy) |
| LEAP_EXPORT Vector | warp (const Vector &xy) const |
| LEAP_EXPORT int | width () const |
 Public Member Functions inherited from Leap::Interface | |
| def | __init__ (self, args, kwargs) |
Static Public Member Functions | |
| static LEAP_EXPORT const Image & | invalid () |
Public Attributes | |
| this | |
Static Public Attributes | |
| bytes_per_pixel = _swig_property(LeapPython.Image_bytes_per_pixel_get) | |
| data | |
| data_pointer = _swig_property(LeapPython.Image_data_pointer_get) | |
| distortion | |
| distortion_height = _swig_property(LeapPython.Image_distortion_height_get) | |
| distortion_pointer = _swig_property(LeapPython.Image_distortion_pointer_get) | |
| distortion_width = _swig_property(LeapPython.Image_distortion_width_get) | |
| format = _swig_property(LeapPython.Image_format_get) | |
| height = _swig_property(LeapPython.Image_height_get) | |
| id = _swig_property(LeapPython.Image_id_get) | |
| INFRARED = LeapPython.Image_INFRARED | |
| is_valid = _swig_property(LeapPython.Image_is_valid_get) | |
| ray_offset_x = _swig_property(LeapPython.Image_ray_offset_x_get) | |
| ray_offset_y = _swig_property(LeapPython.Image_ray_offset_y_get) | |
| ray_scale_x = _swig_property(LeapPython.Image_ray_scale_x_get) | |
| ray_scale_y = _swig_property(LeapPython.Image_ray_scale_y_get) | |
| sequence_id = _swig_property(LeapPython.Image_sequence_id_get) | |
| timestamp = _swig_property(LeapPython.Image_timestamp_get) | |
| width = _swig_property(LeapPython.Image_width_get) | |
Private Member Functions | |
| LEAP_EXPORT const char * | toCString () const |
Static Private Attributes | |
| __getattr__ = lambdaself,name:_swig_getattr(self, Image, name) | |
| __repr__ = _swig_repr | |
| __setattr__ = lambdaself,name,value:_swig_setattr(self, Image, name, value) | |
| __swig_destroy__ = LeapPython.delete_Image | |
| dictionary | __swig_getmethods__ = {} |
| dictionary | __swig_setmethods__ = {} |
Friends | |
| LEAP_EXPORT friend std::ostream & | operator<< (std::ostream &, const Image &) |
Additional Inherited Members | |
| Protected Member Functions inherited from Leap::Interface | |
| template<typename T > | |
| T * | get () const |
| LEAP_EXPORT | Interface (void *owner) |
| LEAP_EXPORT | Interface (Implementation *reference, void *owner) |
| LEAP_EXPORT | Interface (const Interface &rhs) |
| Interface (class SharedObject *object) | |
| LEAP_EXPORT Interface & | operator= (const Interface &rhs) |
| virtual LEAP_EXPORT | ~Interface () |
| Static Protected Member Functions inherited from Leap::Interface | |
| static LEAP_EXPORT void | deleteCString (const char *cstr) |
| Protected Attributes inherited from Leap::Interface | |
| class SharedObject * | m_object |
Detailed Description
The Image class represents a single image from one of the Leap Motion cameras.
In addition to image data, the Image object provides a distortion map for correcting lens distortion.
Note that Image objects can be invalid, which means that they do not contain valid image data. Get valid Image objects from Frame::frames(). Test for validity with the Image::isValid() function.
- Since
- 2.1.0
Member Enumeration Documentation
Enumerates the possible image formats.
The Image::format() function returns an item from the FormatType enumeration.
- Since
- 2.2.0
| Enumerator | |
|---|---|
| INFRARED | |
Constructor & Destructor Documentation
| Leap::Image::Image | ( | ImageImplementation * | ) |
| LEAP_EXPORT Leap::Image::Image | ( | ) |
Constructs a Image object.
An uninitialized image is considered invalid. Get valid Image objects from a ImageList object obtained from the Frame::images() method.
- Since
- 2.1.0
Member Function Documentation
| LEAP_EXPORT int Leap::Image::bytesPerPixel | ( | ) | const |
The number of bytes per pixel.
Use this value along with Image::width() and Image:::height() to calculate the size of the data buffer.
- Since
- 2.2.0
| LEAP_EXPORT const unsigned char* Leap::Image::data | ( | ) | const |
The image data.
The image data is a set of 8-bit intensity values. The buffer is Image::width() * Image::height() * Image::bytesPerPixel() bytes long.
- Returns
- The array of unsigned char containing the sensor brightness values.
- Since
- 2.1.0
| LEAP_EXPORT const float* Leap::Image::distortion | ( | ) | const |
The distortion calibration map for this image.
The calibration map is a 64x64 grid of points. Each point is defined by a pair of 32-bit floating point values. Each point in the map represents a ray projected into the camera. The value of a grid point defines the pixel in the image data containing the brightness value produced by the light entering along the corresponding ray. By interpolating between grid data points, you can find the brightness value for any projected ray. Grid values that fall outside the range [0..1] do not correspond to a value in the image data and those points should be ignored.
The calibration map can be used to render an undistorted image as well as to find the true angle from the camera to a feature in the raw image. The distortion map itself is designed to be used with GLSL shader programs. In non-realtime contexts, it may be more convenient to use the Image::rectify() and Image::warp() functions.
If using shaders is not possible, you can use the distortion map directly. This can be faster than using the warp() function, if carefully optimized:
Distortion is caused by the lens geometry as well as imperfections in the lens and sensor window. The calibration map is created by the calibration process run for each device at the factory (and which can be rerun by the user).
Note, in a future release, there may be two distortion maps per image; one containing the horizontal values and the other containing the vertical values.
- Returns
- The float array containing the camera lens distortion map.
- Since
- 2.1.0
| LEAP_EXPORT int Leap::Image::distortionHeight | ( | ) | const |
The distortion map height.
Currently fixed at 64.
- Since
- 2.1.0
| LEAP_EXPORT int Leap::Image::distortionWidth | ( | ) | const |
The stride of the distortion map.
Since each point on the 64x64 element distortion map has two values in the buffer, the stride is 2 times the size of the grid. (Stride is currently fixed at 2 * 64 = 128).
- Since
- 2.1.0
| LEAP_EXPORT FormatType Leap::Image::format | ( | ) | const |
The image format.
- Since
- 2.2.0
| LEAP_EXPORT int Leap::Image::height | ( | ) | const |
The image height.
- Since
- 2.1.0
| LEAP_EXPORT int32_t Leap::Image::id | ( | ) | const |
The image ID.
Images with ID of 0 are from the left camera; those with an ID of 1 are from the right camera (with the device in its standard operating position with the green LED facing the operator).
- Since
- 2.1.0
|
static |
Returns an invalid Image object.
You can use the instance returned by this function in comparisons testing whether a given Image instance is valid or invalid. (You can also use the Image::isValid() function.)
- Returns
- The invalid Image instance.
- Since
- 2.1.0
| LEAP_EXPORT bool Leap::Image::isValid | ( | ) | const |
Reports whether this Image instance contains valid data.
- Returns
- true, if and only if the image is valid.
- Since
- 2.1.0
| LEAP_EXPORT bool Leap::Image::operator!= | ( | const Image & | ) | const |
| LEAP_EXPORT bool Leap::Image::operator== | ( | const Image & | ) | const |
| LEAP_EXPORT float Leap::Image::rayOffsetX | ( | ) | const |
The horizontal ray offset.
Used to convert between normalized coordinates in the range [0..1] and the ray slope range [-4..4].
- Since
- 2.1.0
| LEAP_EXPORT float Leap::Image::rayOffsetY | ( | ) | const |
The vertical ray offset.
Used to convert between normalized coordinates in the range [0..1] and the ray slope range [-4..4].
- Since
- 2.1.0
| LEAP_EXPORT float Leap::Image::rayScaleX | ( | ) | const |
The horizontal ray scale factor.
Used to convert between normalized coordinates in the range [0..1] and the ray slope range [-4..4].
- Since
- 2.1.0
| LEAP_EXPORT float Leap::Image::rayScaleY | ( | ) | const |
The vertical ray scale factor.
Used to convert between normalized coordinates in the range [0..1] and the ray slope range [-4..4].
- Since
- 2.1.0
| LEAP_EXPORT Vector Leap::Image::rectify | ( | const Vector & | uv | ) | const |
Provides the corrected camera ray intercepting the specified point on the image.
Given a point on the image, rectify() corrects for camera distortion and returns the true direction from the camera to the source of that image point within the Leap Motion field of view.
This direction vector has an x and y component [x, y, 0], with the third element always zero. Note that this vector uses the 2D camera coordinate system where the x-axis parallels the longer (typically horizontal) dimension and the y-axis parallels the shorter (vertical) dimension. The camera coordinate system does not correlate to the 3D Leap Motion coordinate system.
- Parameters
-
uv A Vector containing the position of a pixel in the image.
- Returns
- A Vector containing the ray direction (the z-component of the vector is always 0).
- Since
- 2.1.0
| LEAP_EXPORT int64_t Leap::Image::sequenceId | ( | ) | const |
The image sequence ID.
- Since
- 2.2.1
| LEAP_EXPORT int64_t Leap::Image::timestamp | ( | ) | const |
Returns a timestamp indicating when this frame began being captured on the device.
- Since
- 2.2.7
|
private |
|
inline |
| LEAP_EXPORT Vector Leap::Image::warp | ( | const Vector & | xy | ) | const |
Provides the point in the image corresponding to a ray projecting from the camera.
Given a ray projected from the camera in the specified direction, warp() corrects for camera distortion and returns the corresponding pixel coordinates in the image.
The ray direction is specified in relationship to the camera. The first vector element corresponds to the "horizontal" view angle; the second corresponds to the "vertical" view angle.
The warp() function returns pixel coordinates outside of the image bounds if you project a ray toward a point for which there is no recorded data.
warp() is typically not fast enough for realtime distortion correction. For better performance, use a shader program exectued on a GPU.
- Parameters
-
xy A Vector containing the ray direction.
- Returns
- A Vector containing the pixel coordinates [x, y, 0] (with z always zero).
- Since
- 2.1.0
| LEAP_EXPORT int Leap::Image::width | ( | ) | const |
The image width.
- Since
- 2.1.0
Friends And Related Function Documentation
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friend |
Writes a brief, human readable description of the Image object.
- Since
- 2.1.0
Member Data Documentation
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The documentation for this class was generated from the following files: