Tag:linux Tips JPEG
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Recently, the video is decoded to generate yuv data and then jpg images. The previous scheme is yuv-rgb-bmp-jpg, which is very slow. The calculation time is about Ms, multiple clicks on a photo may lead to video screen latency. Therefore, you can
1 Introduction
Libjpeg a picture decoding library, in the project need to read into the picture, but do not want to rely on OPENCV interface, this can libjpeg complete decoding. Libjpeg has two versions, one of the original Libjpeg, the other is
Recently, the video is decoded to generate YUV data and then JPG images. The previous scheme is YUV-RGB-BMP-JPG, which is very slow. The calculation time is about Ms, multiple clicks on the camera may lead to video screen latency. Therefore, you can
Most open-source or non-open-source software to process JPG images when using libjpeg open-source library, the latest version of the libjpeg-8b, download link
Http://freshmeat.net/projects/libjpeg
There are a lot of makefile files in Linux. in
Compile GD in linux (freetype + libjpeg + libpng + gd-devel)1. Check whether freetype is installedRpm-qa | grep freetypeIf not, compile freetype and download it here../Configure -- prefix =/usr/local/freetype
Make & make install.2. Check whether
Linux under compilation GD (Freetype+libjpeg+libpng+gd-devel)1. Check whether the FreeType is installedRpm-qa | grep FreeTypeNo words compiled freetype here
1. Check whether FreeType is installed
Rpm-Qa | grep FreeType
If not, compile FreeType and download it here.
./Configure -- prefix =/usr/local/FreeType
Make & make install.
2. Check whether libjpeg is installed.
Rpm-Qa | grep libjpeg
If not, compile
The following issues were encountered at compile time today:Configure:error:no usable libjpeg; Please install the Libjpeg devel package or equivalentMakefile:953:recipe for Target '/home/hbg/openwrt/a3_307/build_dir/target-mips_34kc_uclibc-0.9.33.2/
Release date:Updated on:
Affected Systems:Libjpeg-turboDescription:--------------------------------------------------------------------------------Bugtraq id: 54480
Libjpeg-turbo is a derivative tool of libjpeg, which uses SIMD commands on x86, x86
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