Method for discriminating noise and movement in a video image sequence and movement detecting device for carrying out the method.

摘要

1. A method for the discrimination of the noise and of the fluctuation in a video image sequence, characterized in that it consists in detecting the points of an image, hereafter referred to as fluctuating points, whose luminance has varied in relation to the immediately preceding image due to a true fluctuation or else due to the noise, and that it consists with regard to each fluctuating point in : - determining a minorant Nz of the number of points of a zone composed of related fluctuating points, wherein the considered point is located, - realizing a first assessment of the state of the considered point by comparing the value Nz with a fixed value Ns2 (Ns2 being a positive integer), with the state of the point being assessed to be a true fluctuation (M), if Nz > Ns2 and a fluctuation caused by noise (B), if Nz =< Ns2 , - realizing a j**th assessment of the state of the considered point as a function of the state, assessed before, of the fluctuating points related to the considered point and belonging to the same line or else to the following line, with j=2 to p-1, j and p being integers and p being a number smaller than or equal to Ns2 , - realizing a p**th assessment of the state of the considered point as a function of the state assessed before of the N' points following immediately the considered point on the same line, with N' being an integer and fixed such that N' >= Ns2 -p, the state of the considered point being assessed to be a true fluctuation, if it has been assessed before to be a true fluctuation (M) or else if there is among the N' points at least one fluctuating point related to the considered point, and if there is among the fluctuating points related to the considered point at least one point exhibiting a true fluctuation (M), and the considered point being assessed to be subjected to fluctuation caused by noise (B) in all of the other cases, - and discriminating the points of the first category (M) and the points of the second category (B) in accordance with the result of the latest realized assessment.