Blood processing apparatus with robust automated process...

G - Physics – 01 – N

Patent

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G01N 15/04 (2006.01) G01N 33/49 (2006.01)

Patent

CA 2657229

A centrifuge for separating blood having a camera observing fluid flow, and a controller controlling the flow. The location of an interface is detected by image processing steps, which may comprise the steps of "spoiling" the image, "diffusing" the image, "edge detection", "edge linking", "region-based confirmation", and "interface calculation". "Spoiling" reduces the number of pixels to be examined preferentially on orthogonal axis oriented with respect to the expected location of the interface or phase boundary. "Diffusing" smoothes out small oscillations in the interface boundary, making the location of the interface more distinct. "Edge detection" computes the rate of change in pixel intensity, or. "Edge linking" connects adjacent maxima. "Region-based confirmation" creates a pseudo image of the regions that qualify as distinct. "Final edge calculation" uses the points where the shade changes in the pseudo image, averages the radial displacement of these points for the interface position.

L'invention concerne un appareil centrifuge pour séparer le sang possédant une caméra observant l'écoulement de fluide, et un contrôleur régulant le débit. L'emplacement d'une interface est détecté par des phases de traitement d'image, qui peuvent comprendre les phases consistant à 'gâcher' l'image, à 'diffuser' l'image, la 'détection des bords', la 'liaison des bords', une 'confirmation liée à une région', et un 'calcul d'interface'. Le 'gâchage' réduit le nombre de pixels à examiner de manière préférentielle sur un axe orthogonal orienté par rapport à l'emplacement escompté de l'interface ou des limites de phase. La 'diffusion' lisse les petites oscillations dans les limites d'interface, rendant plus distinct l'emplacement de l'interface. La 'détection de bords' calcule le taux de changement d'intensité de pixel, ou la 'liaison des bords' connecte des maxima adjacents. La 'confirmation liée à une région' crée une pseudo-image des régions qualifiées comme distinctes. Le 'calcul des bords final' utilise les points auxquels l'ombre se transforme en pseudo-images et fait la moyenne du déplacement radial de ces points pour la position d'interface.

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