Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Patent
1997-09-11
2000-05-30
Rao, Andy
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
37524017, 37524018, 348699, 348700, 348412, 348413, 348415, H04N 718
Patent
active
060699183
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is based on a method for detecting moved objects in chronologically successive pictures and, more particularly, to a method for detecting moved objects in chronologically successive pictures in which a current picture is divided into picture blocks for block-oriented analysis, a picture signal of a current picture is compared with a picture signal of a corresponding picture block of a first reference picture that precedes the current picture in the chronological succession of pictures and a textural and/or picture signal change is ascertained.
2. Prior Art
From German Patent Application P 44 40 671, which had not yet been published by the priority date of the present application, a method for optical detection of moved objects is already described. To ascertain a moved object, in the known method a current picture is compared with a reference picture with regard to the measurement variables of changes in picture signal, texture, and displacement. If a moved object is detected, then next an object-oriented analysis of the moved objects is carried out, by means of a pixel-precise detection of change with reference to a background picture. Next, in an object mask, the picture regions that belong to the moved object and are coherent are characterized. Based on a concluding examination of topology on the basis of the characteristics, size and linearity and an examination of the object-oriented measurement variables of changes in picture signal, texture, and motion, a moved object is detected.
SUMMARY OF THE INVENTION
The method of the invention has the advantage over the prior art that object characteristics for and object are ascertained an evaluated not merely at one instant but rather that a chronological succession of characteristics is ascertained and evaluated. As a result, it is possible to discriminate among objects that move only briefly and over a short distance, and objects that move continuously over greater distances. For instance, it is possible to distinguish between persons, who move in an oriented way through a scene being photographed, and regions containing trees, which move in the wind over only slight distances. In this way, the stability of the object detection method is increased, on the basis of improved discrimination between useful variables and interference variables.
By the provisions recited in the dependent claims, advantageous further features of and improvements to the method defined by the main claim are possible.
In one advantageous preferred embodiment of the invention the object motion is ascertained as a function of time by adding together previous motion vectors. As a result, in addition to the information that a moved object is moving in an oriented way through an observed scene, accurate information is gained about the course of the object through the picture-taking situation, in the form of a vector chain. In this way, the evaluation of an alarm is improved substantially.
In another preferred embodiment of the invention the object-oriented analysis is limited to those picture regions in which moved objects have been found by the block-oriented analysis or in which objects have been predicted by motion estimation. In this way, an analysis is performed only in those picture regions that are effected by object motion, thus saving effort and time for computation.
In a further preferred embodiment of the invention the mean object-oriented textural change over time is included in evaluating the necessity of whether or not to monitor an object. In this way, one additional characteristic for assessing the behavior of an object over time is available, thus further improving discrimination between useful variables and interference variables.
The use of block-oriented analysis of the textural changes to determine the mean object-oriented textural change over time is particularly advantageous. This substantially lessens the additional effort involved in determining the mean object-oriented textural change over t
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Hoetter Michael
Meyer Michael
Rottmann Frank
Rao Andy
Robert & Bosch GmbH
Striker Michael J.
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