FpImage

FpImage — Internal Image handling routines

Functions

Types and Values

#define FP_TYPE_IMAGE
typedef FpMinutia
  FpImage

Description

Some devices will provide the image data corresponding to a print this object allows accessing this data.

Functions

fp_image_new ()

FpImage *
fp_image_new (gint width,
              gint height);

fp_image_get_width ()

guint
fp_image_get_width (FpImage *self);

Gets the pixel width of an image.

Parameters

self

A FpImage

 

Returns

the width of the image


fp_image_get_height ()

guint
fp_image_get_height (FpImage *self);

Gets the pixel height of an image.

Parameters

self

A FpImage

 

Returns

the height of the image


fp_image_get_ppmm ()

gdouble
fp_image_get_ppmm (FpImage *self);

Gets the resolution of the image. Note that this is assumed to be fixed to 500 points per inch (~19.685 p/mm) for most drivers.

Parameters

self

A FpImage

 

Returns

the resolution of the image in points per millimeter


fp_image_get_minutiae ()

GPtrArray *
fp_image_get_minutiae (FpImage *self);

Gets the minutiae for an image. This data must not be modified or freed. You need to first detect the minutiae using fp_image_detect_minutiae().

Parameters

self

A FpImage

 

Returns

The detected minutiae.

[transfer none][element-type FpMinutia]


fp_image_detect_minutiae ()

void
fp_image_detect_minutiae (FpImage *self,
                          GCancellable *cancellable,
                          GAsyncReadyCallback callback,
                          gpointer user_data);

Detects the minutiae found in an image.

Parameters

self

A FpImage

 

cancellable

a GCancellable, or NULL

 

callback

the function to call on completion

 

user_data

the data to pass to callback

 

fp_image_detect_minutiae_finish ()

gboolean
fp_image_detect_minutiae_finish (FpImage *self,
                                 GAsyncResult *result,
                                 GError **error);

Finish minutiae detection in an image

Parameters

self

A FpImage

 

result

A GAsyncResult

 

error

Return location for errors, or NULL to ignore

 

Returns

TRUE on success


fp_image_get_data ()

const guchar *
fp_image_get_data (FpImage *self,
                   gsize *len);

Gets the greyscale data for an image. This data must not be modified or freed.

Parameters

self

A FpImage

 

len

Return location for length or NULL.

[out][optional]

Returns

The image data.

[transfer none][array length=len]


fp_image_get_binarized ()

const guchar *
fp_image_get_binarized (FpImage *self,
                        gsize *len);

Gets the binarized data for an image. This data must not be modified or freed. You need to first detect the minutiae using fp_image_detect_minutiae().

Parameters

self

A FpImage

 

len

Return location for length or NULL.

[out][optional]

Returns

The binarized image data.

[transfer none][array length=len]


fp_minutia_get_coords ()

void
fp_minutia_get_coords (FpMinutia *min,
                       gint *x,
                       gint *y);

Returns the coordinates of the found minutia. This is only useful for debugging purposes and the API is not considered stable for production.

Parameters

min

A FpMinutia

 

x

x position in image.

[out]

y

y position in image.

[out]

Types and Values

FP_TYPE_IMAGE

#define FP_TYPE_IMAGE (fp_image_get_type ())

FpMinutia

typedef struct fp_minutia FpMinutia;

FpImage

typedef struct {
  guint         width;
  guint         height;

  gdouble       ppmm;

  FpiImageFlags flags;
} FpImage;

Structure holding an image. The public fields are only public for internal use by the drivers.

Members

guint width;

Width of the image

 

guint height;

Height of the image

 

gdouble ppmm;

Pixels per millimeter

 

FpiImageFlags flags;

FpiImageFlags for required normalization