A decoder (100) is disclosed, which selectively reconstructs at least one predetermined data unit out of a coded bit stream (c). The decoder (100) includes a parsing unit (120) to search and parse unambiguous information (up) characterizing the at least one predetermined data unit uniquely. Next, the parsing unit (120) provides this parsed information (up) either directly to a decoding unit (130) or to a look-up table (140) such that the decoding unit (130) could reconstruct the predetermined data unit directly out of the coded bit stream (c) based on the parsed information (up) without decoding and reconstructing the coded bit stream (c) completely. Optionally, a specification unit (110) provides an start position (us) of the coded bit stream (c) to the parsing unit (120) used for starting the search. Therewith, data traffic, computation time and memory resources could be saved for decoding and displaying e.g. compressed JPEG pictures.