G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 21/94 (2006.01) G01N 21/47 (2006.01) G06F 15/70 (1990.01)
Patent
CA 2107064
12 RESIDUAL INK MEASUREMENT ABSTRACT OF DISCLOSURE A method and apparatus for detecting residual ink in a sample by illuminating by diffused infra-red light a series of spots on a sample and examining a small area on each spot by collecting light in a video camera to form a frame for each spot, digitizing each of the frame and detecting areas in the frames having a brightness below a selected level to determine the total dark area of each frame. The number of such frames processed in a set of frames used to categorize the sample is defined when a certain minimum number of frames have been processed and when a selected degree of convergence of the data collected for the set and the data from the frame currently being processed is obtained, or after a preset maximum number of frames have been processed. The sample is characterised on the basis of the ratio of the dark area to the total area processed.
Houston Kevin Clifford Douglas
Popil Roman Ewhen
Macmillan Bloedel Limited
Rowley C.a.
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