![]() Related to this, even though jpylyzer’s validation process is very comprehensive, it is not complete. It cannot prove that that a file does conform to the standard. This (intentionally) implies a certain degree of remaining uncertainty, which is related to the following.įirst of all, jpylyzer (or any other format validator for that matter) ‘validates’ a file by trying to prove that it does not conform to the standard. If a file passes all tests, this is an indication that it is probably valid JP2. Importantly, this presumes that jpylyzer’s tests accurately reflect the format specification, without producing false positives. If a file fails one or more tests, this implies that it does not conform to the standard, and is no valid JP2. It then subjects the file’s contents to a large number of tests, each of which is based on the requirements and restrictions that are defined by the standard. What jpylyzer does is this: based on the JP2 format specification (ISO/IEC 15444-1), it parses a file. First of all, it is important to stress that jpylyzer is not a ‘one stop solution’ that will tell you that an image is 100% perfect. ![]() Since the word ‘validation’ means different things to different people, a few words about the overall scope of jpylyzer. What are the technical characteristics of this image (feature extraction)? Is this really a JP2 and does it really conform to the format’s specifications (validation)? Jpylyzer was specifically created to answer the following questions that you might have about any JP2 file: JP2 is the still image format that is defined by JPEG 2000 Part 1 (ISO/IEC 15444-1). This User Manual documents jpylyzer, a validator and feature extractor for JP2 images. Packed packet headers, tile-part header (PPT) marker segment.Packet length, tile-part header (PLT) marker segment.Packed packet headers, main header (PPM) marker segment.Packet length, main header (PLM) marker segment.Start of tile part (SOT) marker segment (child of tile part).Tile part (child of Contiguous Codestream box).Component registration (CRG) marker segment.Progression order change (POC) marker segment.Quantization component (QCC) marker segment.Quantization default (QCD) marker segment.Region-of-interest (RGN) marker segment.Coding style component (COC) marker segment.Coding style default (COD) marker segment.Image and tile size (SIZ) marker segment (child of Contiguous Codestream box).Data Entry URL box (child of UUID Info box).Default Display Resolution box (child of Resolution box).Capture Resolution box (child of Resolution box).Resolution box (child of JP2 Header box, superbox).Channel Definition box (child of JP2 Header box).Component Mapping box (child of JP2 Header box).Colour Specification box (child of JP2 Header box).Bits Per Component box (child of JP2 Header box).Image Header box (child of JP2 Header box).Installation of Debian packages (Ubuntu/Linux). ![]() Installation of Windows binaries (Windows only). ![]()
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