A method for visualizing movement of a detected object in a scene, comprising: for each image of a sequence of images captured by a camera and depicting the scene: obtaining information indicating an extension and a location in horizontal direction in the image of the detected object; and displaying on a display without access to information related to a distance between the camera and the detected object in the scene, in a 2-dimensional graphical representation of a field of view of the camera in a horizontal plane of the scene, a circle sector having an angle representing the extension in horizontal direction in the image of the detected object and a location in the 2-dimensional graphical representation representing the location in horizontal direction in the image of the detected object, wherein the 2-dimensional graphical representation of the field of view of the camera in the horizontal plane is one of a circle sector and a triangle, wherein a first quotient between the angle of the circle sector and a total angle of the field of view of the camera in the 2-dimensional graphical representation is equal to a second quotient between the extension in horizontal direction in the image of the detected object and a horizontal length of the image, and wherein a third quotient between a first angle from a closest edge in angular direction of the field of view of the camera in the 2-dimensional graphical representation to the centre of the circle sector and a total angle of the field of view of the camera in the 2-dimensional graphical representation is equal to a fourth quotient between a distance from a closest edge in horizontal direction of the image to the centre of the detected object in the image and a horizontal length of the image. obtaining information indicating an extension and a location in horizontal direction in the image of the detected object; and displaying on a display without access to information related to a distance between the camera and the detected object in the scene, in a 2-dimensional graphical representation of a field of view of the camera in a horizontal plane of the scene, a circle sector having an angle representing the extension in horizontal direction in the image of the detected object and a location in the 2-dimensional graphical representation representing the location in horizontal direction in the image of the detected object, wherein the 2-dimensional graphical representation of the field of view of the camera in the horizontal plane is one of a circle sector and a triangle, wherein a first quotient between the angle of the circle sector and a total angle of the field of view of the camera in the 2-dimensional graphical representation is equal to a second quotient between the extension in horizontal direction in the image of the detected object and a horizontal length of the image, and wherein a third quotient between a first angle from a closest edge in angular direction of the field of view of the camera in the 2-dimensional graphical representation to the centre of the circle sector and a total angle of the field of view of the camera in the 2-dimensional graphical representation is equal to a fourth quotient between a distance from a closest edge in horizontal direction of the image to the centre of the detected object in the image and a horizontal length of the image.