已故黑莓手机支持 picture password 解锁。我觉得比输入 PIN 安全得多。
解锁屏幕上底层是图片，上层是很多数字（整体移动）。当特定数字被移到图片上特定位置即可解锁。
可惜没见其他手机使用这种解锁方式（不知是否专利原因）。
https://helpblog.blackberry.com/content/dam/helpblog-blackberry-com/images/blogs/2014/02/bbh-picturepassword02-350x350.png

tiktok 文字
{
text-overflow: clip;
letter-spacing: 3px;
text-shadow: -3px 0 1px cyan, 3px 0 1px red;
}
tiktok 图片
body.theme-custom.theme-3d img {
filter: grayscale(80%) brightness(1.75) drop-shadow(4px 0 0 red) drop-shadow(-4px 0 0 cyan) !important;
opacity: .75;
}

top secret 图片滤镜
```
body.theme-custom.theme-topsecret img,body.theme-custom.theme-topsecret svg:not(.s-avatar--badge) {
filter: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' %3E%3Cdefs%3E%3Cfilter id='filter' x='-20%25' y='-20%25' width='140%25' height='140%25' filterUnits='objectBoundingBox' primitiveUnits='userSpaceOnUse' color-interpolation-filters='sRGB'%3E%3CfeColorMatrix type='matrix' values='-1 0 0 0 1 0 -1 0 0 1 0 0 -1 0 1 0 0 0 1 0' x='0%25' y='0%25' width='100%25' height='100%25' in='SourceGraphic' result='colormatrix'/%3E%3CfeGaussianBlur stdDeviation='0' x='0%25' y='0%25' width='100%25' height='100%25' in='colormatrix' edgeMode='none' result='blur'/%3E%3CfeBlend mode='color-dodge' x='0%25' y='0%25' width='100%25' height='100%25' in='SourceGraphic' in2='blur' result='blend'/%3E%3CfeColorMatrix type='saturate' values='0' x='0%25' y='0%25' width='100%25' height='100%25' in='blend' result='colormatrix1'/%3E%3C/filter%3E%3C/defs%3E%3C/svg%3E#filter") url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' %3E%3Cdefs%3E%3Cfilter id='filter' x='-20%25' y='-20%25' width='140%25' height='140%25' filterUnits='objectBoundingBox' primitiveUnits='userSpaceOnUse' color-interpolation-filters='sRGB'%3E%3CfeConvolveMatrix order='3 3' kernelMatrix='-1 -1 -1 -1 5 -1 -1 -1 -1' divisor='1' bias='1' targetX='0' targetY='0' edgeMode='duplicate' preserveAlpha='true' x='0%25' y='0%25' width='100%25' height='100%25' in='SourceGraphic' result='convolveMatrix'/%3E%3C/filter%3E%3C/defs%3E%3C/svg%3E#filter") invert(0)
}
```

top secret 换字体：font-family: 'Flow Block',serif !important;

@CommandZi 谢谢，通过 UIPickerView 旋转实现了
```
myPickerView.transform = CGAffineTransform(rotationAngle: -90 * (.pi / 180))
```

@vance123 哈哈，跟上云一样，以为不用自己维护机房了，结果要学的东西一点都不少

@xuminzhong 其他都用过，但 jq 是啥？

二值化

feature matching 算法，（ sift 挺好，不过有专利，只在某些版本 opencv 里有）
https://docs.opencv.org/master/dc/dc3/tutorial_py_matcher.html
https://docs.opencv.org/master/d1/de0/tutorial_py_feature_homography.html

弹幕看着难受，眼睛要跟着跑。
我觉得在顶栏 /侧栏 /角落冒泡会更好些

AirPort Extreme 摆放位置看着有点难受，不小心碰一下就会掉下去的感觉

用过 mobaxterm，推荐

我觉得很棒。
是自己裁的还是交给店家裁的？

什么是“垂直领域”?

查省 /市年鉴可能有统计，
或者爬地图搜索。

服务器随身带着是图啥？