| 摘要 |
<p>A method for image acquisition of an object (3) in transit on a movable supporting surface (2), comprises the following steps : - arranging at least one optical device for image acquisition comprising a respective linear camera (1) associated with a lighting device (5); detecting a presence signal of said object (3) in a preset position on said movable supporting surface (2), and signals indicating at least one dimension and/or the position of said object (3) on said movable supporting surface (2), said signals being generated by at least one sensor (6; 7) arranged upstream of said linear camera (1) in the advancing direction (A) of said movable supporting surface (2); detecting a "trigger event" signal, generated on the basis of said presence signal, said linear camera (1) starting to acquire an image of said object (3) on the basis of said "trigger event" signal,- - starting to acquire an image of said object (3) by said linear camera (1), when said object (3) has travelled a preset distance (D) from said preset position, said distance (D) being calculated by an advance sensor (8) suitable for generating a signal comprising an electric pulse at each preset movement of said movable supporting surface (2), said method further comprising setting a mode for image acquisition of said linear camera (1) on the basis of a resolution of said advance sensor (8).</p> |
