ios - 是否可以在 IOS swift 中从更大的图像中检测出矩形图像？
<p><p>例如，我有一张名片放在 table 上，我只想扫描名片。类似于二维码扫描仪，我想将名片图像扫描到应用程序中。</p>
<p>我听说过 OpenCV，但不确定如何将它与 swift 3 一起使用。有什么建议可以引导我朝着正确的方向前进吗？</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>是的!使用 <code>CoreImage</code> 的 <code>CIDetector</code> 你可以检测到 rectangle 。这是您最有可能正在寻找的代码(<strong>Swift 3</strong>)!</p>
<pre><code>func performRectangleDetection(image: CIImage) -> CIImage? {
var resultImage: CIImage?
resultImage = image
let detector = CIDetector(ofType: CIDetectorTypeRectangle, context: nil, options: )!
// Get the detections
var halfPerimiterValue = 0.0 as Float;
let features = detector.features(in: image)
print("feature \(features.count)")
for feature in features as! {
let p1 = feature.topLeft
let p2 = feature.topRight
let width = hypotf(Float(p1.x - p2.x), Float(p1.y - p2.y));
//NSLog(@"xaxis %@", @(p1.x));
//NSLog(@"yaxis %@", @(p1.y));
let p3 = feature.topLeft
let p4 = feature.bottomLeft
let height = hypotf(Float(p3.x - p4.x), Float(p3.y - p4.y));
let currentHalfPerimiterValue = height+width;
if (halfPerimiterValue < currentHalfPerimiterValue)
{
halfPerimiterValue = currentHalfPerimiterValue
resultImage = cropBusinessCardForPoints(image: image, topLeft: feature.topLeft, topRight: feature.topRight,
bottomLeft: feature.bottomLeft, bottomRight: feature.bottomRight)
print("perimmeter \(halfPerimiterValue)")
}
}
return resultImage
}
func cropBusinessCardForPoints(image: CIImage, topLeft: CGPoint, topRight: CGPoint, bottomLeft: CGPoint, bottomRight: CGPoint) -> CIImage {
var businessCard: CIImage
businessCard = image.applyingFilter(
"CIPerspectiveTransformWithExtent",
withInputParameters: [
"inputExtent": CIVector(cgRect: image.extent),
"inputTopLeft": CIVector(cgPoint: topLeft),
"inputTopRight": CIVector(cgPoint: topRight),
"inputBottomLeft": CIVector(cgPoint: bottomLeft),
"inputBottomRight": CIVector(cgPoint: bottomRight)])
businessCard = image.cropping(to: businessCard.extent)
return businessCard
}
</code></pre>
<p>调用函数<code>performRectangleDetection</code>，这里<code>cropBusinessCardForPoints</code>是助手。</p>
<p> <a href="https://stackoverflow.com/questions/8425647/how-to-convert-uiimage-to-ciimage-and-vice-versa" rel="noreferrer noopener nofollow">UIImage/CIImage Conversion . </a> </p>
<p>祝你好运! </p>
<p><strong>仅供引用</strong>:使用 <code>CoreML</code> 是最佳选择之一。</p></p>
<p style="font-size: 20px;">关于ios - 是否可以在 IOS swift 中从更大的图像中检测出矩形图像？，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/45115145/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/45115145/
</a>
</p>
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