Question

我的申请用户可以上传照片。有时,我想让他们隐藏一些照片信息,例如车辆的车牌或发票的个人地址。

为了满足这一需要,我计划将图像的一部分像素化成像。我怎样才能像素化成图像,让图像具有隐藏的区域坐标和面积大小。

我发现如何(通过向下和向上缩放图像)像素, 但我怎么能只瞄准图像的某个区域呢?

区域由两对坐标(x1、y1、x2、y2)或一对坐标和尺寸(x、y、宽度、高度)指定。

Answer 1

I am at work at the moment so can not test any code. I would see if you could work with -region or else use a mask. Copy the image and pixelate the whole image create a mask of the area required, cut a hole in the original image with the mask and overlay it over the pixelated image.

"https://i.sstatic.net/V3Rci.jpg" alt="遮盖图像的示例"/ >

你可以修改这个代码(非常旧,

// Get the image size to creat the mask 
// This can be done within Imagemagick but as we are using php this is simple. 
$size = getimagesize("$input14"); 

// Create a mask with a round hole  
$cmd = " -size {$size[0]}x{$size[1]} xc:none -fill black ". 
" -draw "circle 120,220 120,140" ";  
exec("convert $cmd mask.png");  

// Cut out the hole in the top image  
$cmd = " -compose Dst_Out mask.png -gravity south $input14 -matte ";  
exec("composite $cmd result_dst_out1.png");  

// Composite the top image over the bottom image  
$cmd = " $input20 result_dst_out1.png -geometry +60-20 -composite ";  
exec("convert $cmd output_temp.jpg");  

// Crop excess from the image where the bottom image is larger than the top 
$cmd = " output_temp.jpg -crop 400x280+60+0 "; 
exec("convert $cmd composite_sunflower_hard.jpg ");  

// Delete tempory images 
unlink("mask.png");  
unlink("result_dst_out1.png");  
unlink("output_temp.jpg");

Answer 2

谢谢你的回答,邦佐

我找到了一个方法来达到我想要的图像Magick convert 命令。这是一个三步进程 :

I create a pixelated version of the whole source image.
I then build a mask using the original image (to keep the same size) filled with black (with gamma 0) then I draw blank rectangle where I want unreadable areas.
Then I merge the three images (original, pixelated and mask) in a composite operation.

这里的例子有两个区域(a和b)的像素。

convert original.png -scale 10% -scale 1000% pixelated.png
convert original.png -gamma 0 -fill white -draw "rectangle X1a, Y1a, X2a, Y2a" -draw "rectangle X1b, Y1b, X2b, Y2b" mask.png
convert original.png pixelated.png mask.png -composite result.png

很有魅力,现在我要和RMagick一起做

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