Node.js 我可以在Google Vision api中给出纵横比吗？

我正在探索谷歌视觉和具体功能 “detectCrops”给了我作物的线索。这到底意味着什么

我尝试用一个示例图像点击api，得到了一个带有四个坐标的数组的响应。这个坐标表示什么？长宽比是固定的吗？我可以指定具体的纵横比吗。文件不清楚或我无法理解

我的代码

var vision = require('@google-cloud/vision')({
  projectId: Credentials.PROJECT_ID,
  credentials: Credentials.AUTH_KEY
})

vision.detectCrops('img.jpg', function(err, crops, apiResponse) {
  console.log('err', err)
  console.log('crops', crops)
  console.log('apiResponse', apiResponse)
})

err null

crops [ [ { x: 0, y: 0 },
  { x: 649, y: 0 },
  { x: 649, y: 399 },
  { x: 0, y: 399 } ] ]

apiResponse { responses:
 [ { faceAnnotations: [],
   landmarkAnnotations: [],
   logoAnnotations: [],
   labelAnnotations: [],
   textAnnotations: [],
   fullTextAnnotation: null,
   safeSearchAnnotation: null,
   imagePropertiesAnnotation: null,
   cropHintsAnnotation: [Object],
   webDetection: null,
   error: null } ] }

回应

var vision = require('@google-cloud/vision')({
  projectId: Credentials.PROJECT_ID,
  credentials: Credentials.AUTH_KEY
})

vision.detectCrops('img.jpg', function(err, crops, apiResponse) {
  console.log('err', err)
  console.log('crops', crops)
  console.log('apiResponse', apiResponse)
})

err null

crops [ [ { x: 0, y: 0 },
  { x: 649, y: 0 },
  { x: 649, y: 399 },
  { x: 0, y: 399 } ] ]

apiResponse { responses:
 [ { faceAnnotations: [],
   landmarkAnnotations: [],
   logoAnnotations: [],
   labelAnnotations: [],
   textAnnotations: [],
   fullTextAnnotation: null,
   safeSearchAnnotation: null,
   imagePropertiesAnnotation: null,
   cropHintsAnnotation: [Object],
   webDetection: null,
   error: null } ] }

---

可以提供纵横比

vision.detectCrops('./img.jpg', {imageContext : {cropHintsParams : {aspectRatios : [1.77]}}}, function(err, crops, apiResponse) {
  console.log('crops', crops) 
}