2. The target recognition system according to claim 1 , wherein the imaging device has a stereo imaging device to capture a stereo image including two images, the recognition system further comprising a parallax calculator to calculate parallax of the captured image from the two images in the stereo image, wherein the recognition area detector detects multiple recognition areas from a luminance image of one of the images in the stereo image or a parallax image having pixel values corresponding to the parallax calculated by the parallax calculator.
3. The target recognition system according to claim 2 , wherein the recognition area detector classifies the multiple recognition areas, using the parallax of the captured image calculated by the parallax calculator, based on frequency distribution at respective heights in the captured image.