ImageContext

Image context and/or feature-specific parameters.

JSON representation 
{
  "languageHints": [
    string
  ],
  "textDetectionParams": {
    object (TextDetectionParams)
  }
}
Fields
languageHints[]

string

List of languages to use for TEXT_DETECTION. In most cases, an empty value yields the best results since it enables automatic language detection. For languages based on the Latin alphabet, setting languageHints is not needed. In rare cases, when the language of the text in the image is known, setting a hint will help get better results (although it will be a significant hindrance if the hint is wrong). Text detection returns an error if one or more of the specified languages is not one of the supported languages.
textDetectionParams

object (TextDetectionParams)

Parameters for text detection and document text detection.

TextDetectionParams

Parameters for text detections. This is used to control TEXT_DETECTION and DOCUMENT_TEXT_DETECTION features.

JSON representation 
{
  "enableTextDetectionConfidenceScore": boolean,
  "advancedOcrOptions": [
    string
  ]
}
Fields
enableTextDetectionConfidenceScore

boolean

By default, Cloud Vision API only includes confidence score for DOCUMENT_TEXT_DETECTION result. Set the flag to true to include confidence score for TEXT_DETECTION as well.
advancedOcrOptions[]

string

A list of advanced OCR options to fine-tune OCR behavior.