Attention: Answers.ros.org is deprecated as of August the 11th, 2023. Please visit robotics.stackexchange.com to ask a new question. This site will remain online in read-only mode during the transition and into the foreseeable future. Selected questions and answers have been migrated, and redirects have been put in place to direct users to the corresponding questions on Robotics Stack Exchange. Additional details are available here.

Rosbridge PNG decompression in Obj-C/C++

asked 2014-12-18 15:31:05 -0600

tropic

84 ●10 ●14 ●18

I use rosbridge/websocket for an iOS project. I want to use the PNG compression option for image transfers but cannot figure out how to implement this "hack" of decompressing the PNG data in Objective C (C++ should also be ok) .

Is there any alternative compression method in rosbridge e.g. gzip? If not, how would you go about implementing the PNG decompression in Objective C (or perhaps C++)?

edit retag flag offensive close merge delete

add a comment

1 Answer

Sort by » oldest newest most voted

answered 2014-12-19 01:08:27 -0600

Wolf

7555 ●71 ●105 ●162

If you have opencv (it's ported to iOS) you can use cv::imdecode ( http://docs.opencv.org/modules/highgu... ). It works same like cv::imread for reading+decoding png/jpg etc. data from files with the difference takes not a file but a binary buffer e. g. std::vector<uchar> as input for decoding...

edit flag offensive delete link

add a comment

Question Tools

1 follower

Stats

Asked: 2014-12-18 15:31:05 -0600

Seen: 616 times

Last updated: Dec 19 '14

Rosbridge PNG decompression in Obj-C/C++ edit

1 Answer

Question Tools

Stats

Related questions

Rosbridge PNG decompression in Obj-C/C++