Blind Watermark Decoding

url

• Type: string
• Default: ''
• Description: Path to the image requiring decoding (URL or base64)

mode

• Type: string
• Default: 'canvas'
• Available Values: 'canvas'
• Description: Decoding mode, currently only canvas method is supported

fillColor

• Type: string
• Default: '#000'
• Description: Fill color used during decoding, affects final decoding result

compositeOperation

• Type: string
• Default: 'color-burn'
• Description: Image composite operation type used to enhance watermark visibility

compositeTimes

• Type: number
• Default: 3
• Description: Number of composite operation repetitions - more repetitions make watermark more visible

onSuccess

• Type: Function
• Default: undefined
• Description: Callback function after successful decoding, parameter contains decoded image data

Decoding Principle

Blind watermark decoding works through these steps:

1. Load image containing blind watermark
2. Create canvas and draw original image
3. Apply specified composite operation and fill color
4. Repeat composite operation multiple times to enhance watermark visibility
5. Output processed image

Usage Example

BlindWatermark.decode({
  url: 'image-with-watermark.png',
  fillColor: '#000',
  compositeOperation: 'color-burn',
  onSuccess: (decodedImage) => {
    // Handle decoded image
  }
})