使用多个核批量模糊图像 [英] Batch blur images using multiple cores

问题描述

我正在尝试使用imagemagick模糊数千（> 50,000）图像的底部。图像分辨率为800x600。命令行代码（如下）有效，但需要很长时间。有没有什么方法可以并行运行，并希望使用system（）从R内调用？

I'm trying to blur the bottom section of thousands (>50,000) of images using imagemagick. Image resolution is 800x600. The command line code (below) works, but takes a long time. Is there any way that this can be run in parallel, and hopefully called from within R using system()?

我从互联网上获取此代码，所以我是不确定这是否是实现这一目标的最佳方式？任何帮助将不胜感激。提前致谢！

I got this code off the internet, so I'm not sure if it's the best way to even achieve this objective? Any help would be greatly appreciated. Thanks in advance!

（OS = OSX El Capitan）

(OS = OSX El Capitan)

cd /Users/Desktop/test_images
list=$(ls *.jpg)
for img in $list; do
    convert $img \
    \( -size 800x525 xc:black -size 800x75 xc:white -append \) \
    -compose blur -define compose:args=6 -composite \
    cd /Users/Desktop/test_images/results/$img
done
cd

推荐答案

我认为这个命令与你正在做的事情非常相似，但FAR更快。看看你是否喜欢这种效果：

I think this command does something very similar to what you are doing but is FAR quicker. See if you like the effect:

convert start.jpg \( +clone -crop +0+525 -blur x4 \) -gravity south -composite result.jpg

如果可行，您可以像以前一样使用 GNU Parallel ：

If that works, you can use GNU Parallel just as before:

parallel 'convert {} \( +clone -crop +0+525 -blur x4 \) -gravity south -composite results/{}' ::: *.jpg

您还可以将该批次放入名为 BlurTitle 的脚本中像这样：

You can also put that lot in a script called BlurTitle like this:

#!/bin/bash
parallel 'convert {} \( +clone -crop +0+525 -blur x4 \) -gravity south -composite results/{}' ::: *.jpg

然后使其可执行：

chmod +x BlurTitle

和从 R 调用它：

system("./BlurTitle")

或来自终端的：

./BlurTitle

如果你得到参数列表太长 ，你可以通过在 stdin 上发送参数而不是在命令后发表相反的表达方式：

If you get "Argument list too long", you can express it the other way around like this by sending the arguments on stdin rather than after the command:

cd /path/to/images
find . -name \*.jpg -print0 | parallel -0 'convert {} \( +clone -crop +0+525 -blur x4 \) -gravity south -composite results/{}'

这篇关于使用多个核批量模糊图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！