An opinionated Swift package for basic VNRecognizeTextRequest operations.
For background, please see the Searching Text in Images on the Aviation Collection Website blog post.
Documentation is incomplete at this time.
let te = TextEmboss()
let rsp = te.ProcessImage(image: cgImage)
As in:
import TextEmboss
import Foundation
import AppKit
public enum Errors: Error {
case notFound
case invalidImage
case cgImage
}
let fm = FileManager.default
if (!fm.fileExists(atPath: inputFile)){
throw(Errors.notFound)
}
guard let im = NSImage(byReferencingFile:inputFile) else {
throw(Errors.invalidImage)
}
guard let cgImage = im.cgImage(forProposedRect: nil, context: nil, hints: nil) else {
throw(Errors.cgImage)
}
let te = TextEmboss()
let rsp = te.ProcessImage(image: cgImage)
switch rsp {
case .failure(let error):
throw(error)
case .success(let rsp):
print(rsp.text)
}
Where rsp is a ProcessImageResult instance:
public struct ProcessImageResult: Encodable {
public var text: String
public var source: String
public var created: Int64
}
Note: The source key is an arbitrary string used to identify the processes, or models, from which image text was derived. As of this writing this string has no standard formatting or requirements. If and when those conventions are established this package will be updated to use them.
For example (using the text-emboss tool in the sfomuseum/swift-text-emboss-cli package)
$> ./.build/debug/text-emboss --as-json true /usr/local/test.png | jq
{
"text": "1666533115581165568-wayfinding-from-1847571933-t…\nPage 9 of 179\nQr Search\n166653311558116…\n#2, 3, 5, 7, from Nine Drypoints and Etchings\n9\n7%\n10\n11\nhttps://www.sfomuseum.org/public-art/public-collection/2-3-5-7-nine-drypoints-and-etchings\nSFO Museum Galleries and exhibitions from SFO Museum and public art works from the San Francisco Art Commission that you'll encounter\nbetween Grand Hyatt Hotel Lobby and Gate B18 at SFO in June, 2023.",
"created": 1701890454,
"source": "com.apple.visionkit.VNImageRequestHandler#Version 14.1.2 (Build 23B92)"
}