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Scanning a document from an image | Web Document Scanner

async detectDocument(imageBuffer: ArrayBuffer, acceptedAngleScore?: number, acceptedSizeScore?: number): Promise<ContourDetectionResult>
class ContourDetectionResult {
    horizontalLines?: MagneticLine[];
    verticalLines?: MagneticLine[];
    polygon?: Polygon;
    detectionStatus?: DetectionStatus;
    success?: boolean;
}
class MagneticLine {
    p1: Point;
    p2: Point;
}

Detects document on a still image on JPG file regardless of the image source (e.g. scanned document image, image picked from photo library, etc).

Example usage:

...
reader.readAsArrayBuffer(file);
reader.onload = async (e) => {
    const result = await scanbotSDK.detectDocument(reader.result);
    if (result.success === true) {
        ...
    } else {
        ...
    }
};

The result object contains the following properties:

  • detectionStatus – DetectionStatus, contains the same keys as the hint texts mentioned earlier
  • success – boolean, whether detection was successful or not
  • original – If success, contains the cropped document ArrayBuffer (UInt8Array)
  • cropped – If success, contains the cropped document ArrayBuffer (UInt8Array)
  • polygon – Polygon, The page's cropping polygon as calculated by a document detection operation
enum DetectionStatus {
    NotAcquired = 'NotAcquired',
    OK = 'OK',
    OK_SmallSize = 'OK_SmallSize',
    OK_BadAngles = 'OK_BadAngles',
    OK_BadAspectRatio ='OK_BadAspectRatio',
    OK_OffCenter = 'OK_OffCenter',
    Error_NothingDetected = 'Error_NothingDetected',
    Error_Brightness = 'Error_Brightness',
    Error_Noise = 'Error_Noise',
}
type Polygon = [Point, Point, Point, Point];

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