Residual ink measurement

Details Residual ink measurement Residual ink measurement

1992-10-01

1994-01-11

Fields, Carolyn E.

Radiant energy

Infrared-to-visible imaging

2503581, 250341, 2503601, 162263, G01N 2188

Patent

active

052784118

ABSTRACT:
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.

REFERENCES:
patent: 4931657 (1990-06-01), Houston et al.
patent: 4935628 (1990-06-01), Martin et al.
patent: 4964949 (1990-10-01), Hamaguchi et al.
"On-line Automated Pulp Dirt Count Measurement", Kenesy et al., TAPPI Proceedings Pulping Conference 1987.

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