Abstract: A method and apparatus for measuring the volume of liquid contained in a syringe having a barrel with a barrel flange and a barrel bottom surface and plunger with a plunger flange. An image of the syringe is captured and processed to determine a length dimension of the syringe that is characteristic of its model. The length dimension determined from the image processing is used to look up the syringe model in a dataset that stores the relevant length dimension for each syringe model. The dataset also stores, for each syringe model, calibration values representing the volume of liquid contained in the syringe at each of at least two plunger positions. The volume of liquid held in the syringe is determined from the plunger position obtained by processing the image to determine the distance between the barrel flange or barrel bottom surface and plunger flange and the calibration values.

Abstract: A method and apparatus for measuring the volume of liquid contained in a syringe having a barrel) with a barrel flange and a barrel bottom surface and plunger with a plunger flange. An image of the syringe is captured and processed to determine a length dimension of the syringe that is characteristic of its model. The length dimension determined from the image processing is used to look up the syringe model in a dataset that stores the relevant length dimension for each syringe model. The dataset also stores, for each syringe model, calibration values representing the volume of liquid contained in the syringe at each of at least two plunger positions. The volume of liquid held in the syringe can be determined from the plunger position obtained by processing the image, more specifically from the distance between the barrel flange or barrel bottom surface and plunger flange.