I would like to know how to use libjpeg for progressive compression. Especially, how to use spectral selection or successive approximation only, or both (full progression).
As far as I know, there are parameters Ss and Se (start/end of spectral selection band) and Ah and Al (high/low bit position for successive approximation) - does setting value for these parameters decide which method is used?
Progressive JPEG in libjpeg
820 Views Asked by Artyshan At
1
There are 1 best solutions below
Related Questions in JPEG
- SQL server not returning all rows
- Big data with spatial queries/indexing
- Conditional null constraint on Null
- SQL Query - Order by String (which contains number and chars)
- Optimising a slow running SQL Server Stored procedure ordered by calculated fields to return a closest match
- Dynamics CRM Publishing Customizations - Multi Developers
- Is there anyway to set the relationship of many tables from Model?
- Implementation of Rank and Dense Rank in MySQL
- ORM Code First versa Database First in Production
- MVC : Insert data to two tables
Related Questions in LIBJPEG
- SQL server not returning all rows
- Big data with spatial queries/indexing
- Conditional null constraint on Null
- SQL Query - Order by String (which contains number and chars)
- Optimising a slow running SQL Server Stored procedure ordered by calculated fields to return a closest match
- Dynamics CRM Publishing Customizations - Multi Developers
- Is there anyway to set the relationship of many tables from Model?
- Implementation of Rank and Dense Rank in MySQL
- ORM Code First versa Database First in Production
- MVC : Insert data to two tables
Related Questions in PROGRESSIVE
- SQL server not returning all rows
- Big data with spatial queries/indexing
- Conditional null constraint on Null
- SQL Query - Order by String (which contains number and chars)
- Optimising a slow running SQL Server Stored procedure ordered by calculated fields to return a closest match
- Dynamics CRM Publishing Customizations - Multi Developers
- Is there anyway to set the relationship of many tables from Model?
- Implementation of Rank and Dense Rank in MySQL
- ORM Code First versa Database First in Production
- MVC : Insert data to two tables
Trending Questions
- UIImageView Frame Doesn't Reflect Constraints
- Is it possible to use adb commands to click on a view by finding its ID?
- How to create a new web character symbol recognizable by html/javascript?
- Why isn't my CSS3 animation smooth in Google Chrome (but very smooth on other browsers)?
- Heap Gives Page Fault
- Connect ffmpeg to Visual Studio 2008
- Both Object- and ValueAnimator jumps when Duration is set above API LvL 24
- How to avoid default initialization of objects in std::vector?
- second argument of the command line arguments in a format other than char** argv or char* argv[]
- How to improve efficiency of algorithm which generates next lexicographic permutation?
- Navigating to the another actvity app getting crash in android
- How to read the particular message format in android and store in sqlite database?
- Resetting inventory status after order is cancelled
- Efficiently compute powers of X in SSE/AVX
- Insert into an external database using ajax and php : POST 500 (Internal Server Error)
Popular # Hahtags
Popular Questions
- How do I undo the most recent local commits in Git?
- How can I remove a specific item from an array in JavaScript?
- How do I delete a Git branch locally and remotely?
- Find all files containing a specific text (string) on Linux?
- How do I revert a Git repository to a previous commit?
- How do I create an HTML button that acts like a link?
- How do I check out a remote Git branch?
- How do I force "git pull" to overwrite local files?
- How do I list all files of a directory?
- How to check whether a string contains a substring in JavaScript?
- How do I redirect to another webpage?
- How can I iterate over rows in a Pandas DataFrame?
- How do I convert a String to an int in Java?
- Does Python have a string 'contains' substring method?
- How do I check if a string contains a specific word?
I can speak to JPEG in general as I do not use LIBJPEG.
The method used is determined by the type of FRAME used. The SS, SE, AH, and AL parameters are for the SCAN. A frame is made up of multiple scans.
The SS and SE parameters to the SCAN indicate the range of DCT coefficients that are encoded. The AH and AL parameters can range from 0-13. Thus, in theory you can have 14 * 64 = 896 scans for a single component.
Looking in the LIBJPEG manual, it looks like this is done through setting up sequences of scans in a "j_compress_ptr" structure. They also mention a function "jpeg_simple_progression()" for setting this up.