Abstract: A method in image processing for detection of a change in the scene in an area. The method comprises the steps of recording a digital image of the area using a sensor and transforming the recorded image by an operator. The operator is based on a previous modeling of changes in the lighting in the area and on a modeling of how the sensor depicts the area in grayscale values in the recorded image. The method further comprises the step of comparing the transformed image with a reference image of the area in order to detect a difference that indicates a change in the scene.

Abstract: A method for monitoring a monitored area comprising the steps of recording an image of the monitored area and of comparing the recorded image with a reference image in order to determine whether there is an alarm situation. The method further comprises the step of creating the reference image by combining at least two previously stored images from a set of images, so that the lighting conditions in the reference image are adjusted to the lighting conditions in the recorded image.

Abstract: A method and a device for managing image information in a monitoring system. The monitoring system comprises at least one monitoring module (1) for monitoring a monitored location and a remote recipient unit (3). The method comprises the steps of recording an image of the monitored location with the monitoring module (1), segmenting out a distinct region by comparing the recorded image with a reference image in the monitoring module (1), creating an outline shape in the monitoring module which represents the edge of the distinct region, transmitting data which represents the outline shape to the recipient unit (3), recreating the outline shape in the recipient unit by means of said transmitted data, and displaying the outline shape visually in the recipient unit.