Abstract: The invention relates to a method and device for the detection of changes in illumination for vision systems between a digital image of an area and a digital image of a background model of said region of study of the same size, wherein, based on such images, at least one blob of a region which reflects the differences between the background model and the current or detection image of the area is selected by segmentation techniques, the spatial correlation between the pixels of the blob in the detection image and in the background model image being found. According to the correlation with respect to a threshold value thereof, this change is associated with a change in illumination. An implementation suitable for video surveillance systems is provided together with the previous device.

Abstract: The present invention relates to an advertising impact measuring system and method counting in real time the people (4) looking at a target scene (5). The system comprises a video camera (1) located behind the target scene (5) and data processing means (2) responsible for processing the images captured by the camera (1), comprising a face detection module (9) responsible for analyzing the images it receives from the camera (1) and detecting faces; a face tracking module (10) responsible for calculating the number of different faces NF appearing in each image and its position PX,Y therein; a statistics generation module (12) responsible for receiving the data NF, PX,Y and the time TF each face is in the image coming from the tracking module (10), counting the advertising impact as well as generating statistics in relation to said impact.