Estimation of space is required to store 275305224 of 5×5 MagicSquares? [closed]
Closed 9 years ago.
Is hash calculated before/after compression?
I had a question regarding compression and calculation of checksum/hash of data.
How would you go about compressing a list of integers that are non unique and retain the original order?
Let’s start out with an example
How does Yahoo’s Smush.It work and why doesn’t everyone use it?
I’ve recently come across an application by Yahoo called SmushIt. Apparently it does lossless compression on images. Sometimes the image size is reduced by as much as 90%. This of course has major implications when working on the web since it greatly improves performance on pages that have a lot of images. Now I’m sure there are other applications like this one out there but I’ve never heard of anyone actually doing lossless image compression in web development.
Why is there little use of filesharing as compression (outside of libraries)?
Recently I was looking for a program that will run as a daemon and find files that have the same size/type, check if they’re the same, then make both a hard link to a single copy if they are. And I started wondering why Operating Systems don’t do this automatically.
What should I do when using Golomb/Rice code for large values？
When using Golomb/Rice code in image compression, it is inevitable for us to meet large values. Golomb coding uses a tunable parameter M to divide an input value N into two parts : q, the result of a division by M, and r, the remainder. The quotient is sent in unary coding, followed by the remainder in binary.
What should I do when using Golomb/Rice code for large values？
When using Golomb/Rice code in image compression, it is inevitable for us to meet large values. Golomb coding uses a tunable parameter M to divide an input value N into two parts : q, the result of a division by M, and r, the remainder. The quotient is sent in unary coding, followed by the remainder in binary.
What should I do when using Golomb/Rice code for large values？
When using Golomb/Rice code in image compression, it is inevitable for us to meet large values. Golomb coding uses a tunable parameter M to divide an input value N into two parts : q, the result of a division by M, and r, the remainder. The quotient is sent in unary coding, followed by the remainder in binary.
Turn on gzip on nginx, upstream (nodejs) or both? [closed]
Closed 9 years ago.
Calculating uncompressed file size without uncompressing file in zlib
I am writing a python program which parses zip (currently only zlib, using DEFLATE compression) files and verifies the correctness of their headers and data. One of the things I’m trying to achieve is calculating the uncompressed size of a compressed (DEFLATE-d) file inside a zip archive, without actually uncompressing the file and, obviously, not relying on the uncompressed size field found in the file record’s headers. This is so that I can ensure that none of the zip record’s fields have been tampered with (in this case, the uncompressed size field).