Image processing method for the detection of the horizon and dev

Details Image processing method for the detection of the horizon and dev Image processing method for the detection of the horizon and dev

1991-07-19

1993-05-25

Couso, Jose L.

Image analysis

Histogram processing

For setting a threshold

382 30, 382 34, G06K 920

Patent

active

052147207

ABSTRACT:
According to the method, after a step for the digital processing of the video signal of the image analyzed by rows, there is determined, for each row, on the basis of the distribution of the mean light energy values below and above each position of the row, a step modelling function, the jump position of which gives the position of the horizon in this row. The device used to implement this method includes a sampler of the video signal coupled with a flip flop memory through an accumulator which adds up the luminance values row by row, and a processor which, on the basis of the distribution of the mean light energy levels, computes the signal to be subtracted from the digital video signal by means of a subtractor. The disclosed method and device can be applied to the detection of the horizon from an image analyzed by columns or by lines.

REFERENCES:
patent: 4223345 (1980-09-01), Hannigan
patent: 4400727 (1983-08-01), Aron
patent: 4497065 (1985-01-01), Tisdale et al.
patent: 4845610 (1989-07-01), Parvin
patent: 5109435 (1992-04-01), Lo et al.

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