ARKit 2-作物识别图像 [英] ARKit 2 - Crop Recognizing Images
本文介绍了ARKit 2-作物识别图像的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
所以,我的目标是:
-
查找已知图片
Find known image
guard let referenceImages = ARReferenceImage.referenceImages(inGroupNamed: "AR Resources", bundle: nil) else { return }
let configuration = ARWorldTrackingConfiguration()
configuration.detectionImages = referenceImages
.
-
从sceneView拍摄快照
take a snapshot from sceneView
func renderer(_ renderer: SCNSceneRenderer, didAdd node: SCNNode, for anchor: ARAnchor) {
let image = sceneView.snapshot() // or else self.sceneView.session.currentFrame?.capturedImage
我需要从SceneView中提取图像.
I need extract the image form the SceneView.
这是我的代码,我正在使用renderer.projectPoint方法.
This is my code, I'm using the renderer.projectPoint method.
guard let imageAnchor = anchor as? ARImageAnchor else {
return
}
let posx = anchorTr.x// fnode.convertPosition(node.position, to: node).x //self.positionFromTransform(node.simdTransform).x// node.simdTransform.columns.3.x
let posy = anchorTr.y//fnode.convertPosition(node.position, to: node).y //self.positionFromTransform(node.simdTransform).y//node.simdTransform.columns.3.y
let posz = anchorTr.z //node.simdTransform.columns.3.z
let width = referenceImage.physicalSize.width
let height = referenceImage.physicalSize.height
let topLeftPosition = SCNVector3(posx - Float(width / 2), posy - Float(height / 2), posz )
let topRightPosition = SCNVector3(posx + Float(width / 2), posy - Float(height / 2), posz )
let bottomLeftPosition = SCNVector3(posx - Float(width / 2), posy + Float(height / 2), posz )
let bottomRightPosition = SCNVector3(posx + Float(width / 2), posy + Float(height / 2), posz)
let topLeftProjection = renderer.projectPoint(topLeftPosition)
let topRightProjection = '''
let bottomLeftProjection = '''
let bottomRightProjection = '''
let topLeft = CGPoint(x: CGFloat(topLeftProjection.x), y: CGFloat( topLeftProjection.y))
let topRight = ''
let bottomLeft = ''''''
let bottomRight = '''
let points = [topLeft, topRight, bottomRight, bottomLeft]
self.drawPolygon(points, color:.green)
但是,似乎这种方法取决于手机的位置.
but it seems that this method depends on the position of the cell phone.
推荐答案
对于我来说,我通过对每个参考点执行此操作来解决了该问题.
In my case, I solved it by doing this for each of the reference points.
let transform = node.simdConvertTransform(node.simdTransform, to: node.parent!)
let x = transform.columns.3.x
let y = transform.columns.3.y
let z = transform.columns.3.z
let position = SCNVector3(x, y, z)
let projection = renderer.projectPoint(position)
let screenPoint = CGPoint(x: CGFloat(projection.x), y: CGFloat( projection.y))
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