Abstract: A method for directionally warning as to a target object behind a vehicle acquires images of environment surrounding the vehicle. Objects in the environment images are identified and high-risk target object or objects from all the objects is labeled. A relative direction and a relative location of the target object with the transportation are confirmed. A warning device is adjusted based on the relative direction and the relative location. The warning device gives directional warning as to the target object. A collision risk warning system and a transportation applying the method are also disclosed.

Abstract: A target tracking method includes receiving an initial video of a number of targets to be tracked acquired by a first mobile camera device, identifying the number of targets to be tracked in the initial video, tracking the plurality of targets to be tracked, and determining whether all of the targets to be tracked are within a tracking range of the first mobile camera device. If at least one target to be tracked is not within the tracking range of the first mobile camera device, at least one second mobile camera device is controlled to track the at least one target to be tracked that is not within the tracking range of the first mobile camera device.

Abstract: A target tracking method includes receiving an initial video of a number of targets to be tracked acquired by a first mobile camera device, identifying the number of targets to be tracked in the initial video, tracking the plurality of targets to be tracked, and determining whether all of the targets to be tracked are within a tracking range of the first mobile camera device. If at least one target to be tracked is not within the tracking range of the first mobile camera device, at least one second mobile camera device is controlled to track the at least one target to be tracked that is not within the tracking range of the first mobile camera device.