Abstract: An apparatus to obtain 3D location information from an image using a single camera or sensor includes a first table, in which the numbers of pixels are recorded according to the distance of a reference object. Using the prepared first table and a determined focal distance, a second table is generated in which the number of pixels is recorded according to the distance of a target object. Distance information is then calculated according to the detected number of pixels with reference to the second table. A method for obtaining 3D location information includes detecting a number of pixels of a target object from a first image, generating tables including numbers of pixels according to distance, detecting a central pixel and a number of pixels of the target object from a second image, and estimating two-dimensional location information one-dimensional distance of the target object from the tables and pixel information.