Purkinje-Sanson images

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Pur·kin·je-San·son im·ag·es

(pŭr-kin'jē san'sŏn),
the two images formed by the anterior and posterior surfaces of the cornea and the two images formed by the anterior and posterior surfaces of the lens.

Pur·kin·je-San·son im·a·ges

(pŭr-kin'jē san-să-sōn[h]' im'ăj-ĕz)
The two images formed by the anterior and posterior surfaces of the cornea and the two images formed by the anterior and posterior surfaces of the lens.
Synonym(s): Sanson images.

Purkinje-Sanson images

Three images of the same object, produced by reflections from the surface of the cornea and the anterior and posterior surfaces of the lens of the eye. For the most part, the viewer adapts to this phenomenon and ignores these extra images.

Purkinje,

Johannes E. von (Jan E. Purkyne), Bohemian anatomist and physiologist, 1787-1869.
Purkinje afterimage - Synonym(s): Bidwell ghost
Purkinje cells - large nerve cells of the cerebellar cortex with a piriform cell body and dendrites arranged in a plane transverse to the folium. Synonym(s): Purkinje corpuscles
Purkinje conduction - conduction of the cardiac impulse through the Purkinje system.
Purkinje corpuscles - Synonym(s): Purkinje cells
Purkinje effect - Synonym(s): Purkinje phenomenon
Purkinje fibers - interlacing fibers formed of modified cardiac muscle cells that are the terminal ramifications of the conducting system of the heart found beneath the endocardium of the ventricles.
Purkinje figures - shadows of the retinal vessels seen as dark lines on a reddish field when a light enters the eye through the sclera and not the pupil.
Purkinje image tracker
Purkinje images - Synonym(s): Purkinje-Sanson images
Purkinje layer - the layer of Purkinje cells between the molecular and granular layers of the cerebellar cortex. Synonym(s): piriform neuron layer
Purkinje network - the network formed by Purkinje fibers beneath the endocardium.
Purkinje phenomenon - in the light-adapted eye, the region of maximal brightness is in the yellow; in the dark-adapted eye, the region of maximal brightness is in the green. Synonym(s): Purkinje effect; Purkinje shift
Purkinje shift - Synonym(s): Purkinje phenomenon
Purkinje system - terminal ramifications in the ventricles of the specialized conducting system of the heart.
Purkinje-Sanson images - the two images formed by the anterior and posterior surfaces of the cornea, and the two images formed by the anterior and posterior surfaces of the lens. Synonym(s): catatropic images; Purkinje images; Sanson images

Sanson,

Louis J., French physician, 1790-1841.
Purkinje-Sanson images - see under Purkinje
Sanson images - Synonym(s): Purkinje-Sanson images
References in periodicals archive ?
proposed a fake iris detection method that used three Purkinje images [11].
In order to extract optical features, we used the distance between the 1st and 4th Purkinje images (dual Purkinje images).
1)] from the dual Purkinje images (1st and 4th Purkinje images) for detecting fake irises based on the optical features of the human eye, as shown in Fig.
The S-IR (Side IR), which illuminated the iris in the side direction, was used for generating the dual Purkinje images and the other image for 3D textural analysis.
1, we analytically model the generation of dual Purkinje images based on the human eye structure.
The positions of these four Purkinje images depend on the geometrical positions of four optical surfaces of the human eye and the light sources [12].
In previous research [12], only the 1st, 2nd and 4th Purkinje images were used to detect fake irises because the 3rd Purkinje image was sometimes hidden by the large 1st Purkinje image.
5 (a), four Purkinje images were generated from the four optical mirror surfaces [12].
For example, if the distance between the illuminator and the user's gaze position is long, a distance between dual Purkinje images becomes long as shown in Fig.
Also, even if the distance between the illuminator and the user's gaze position is same, the longer Z-distance between the gaze position and a user's eye causes the shorter distance between the dual Purkinje images as shown in Fig.
Dual Purkinje images projected onto the camera image plane based on perspective projection can be extracted by using binarization and component labeling because their gray levels are comparatively high than those of iris and pupil region as shown Fig.
8, there were dual Purkinje images when we used live irises ((a)~(c)).