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Example code of kid1296/blind-watermark

Informations about the package blind-watermark

BlindWatermark

PHP Library for Blind&Invisible Image Watermark.

GitHub：https://github.com/kid1296/BlindWatermark

License PHP Platform

Features

Item Before Now
Speed (940×940 embed) ~4.9 s ~2.5 s (2× faster)
Speed (extract) ~3.8 s ~1.5 s (2.5× faster)
Peak memory (embed+extract, 940×940) required memory_limit=2G ~61 MB (fits in default 128 MB)
Peak memory (1358×780) OOM at 128 MB ~81 MB
Image quality (PSNR, 940×940) ~36.9 dB 35.6 dB
Robustness (salt-pepper / bright / shelter / crop) PASS PASS
Robustness (resize, natural photo) PASS PASS

PSNR 35–40 dB is generally considered "visually lossless" for photographs. The d1/d2 default was reduced from 36/20 to 27/15 for higher PSNR, while still tolerating salt-pepper / brightness / shelter / crop attacks on typical host images.

Requirements

The GD extension is required for all image I/O (reading JPEG/PNG, writing PNG, and applying attack simulations such as resize / salt-pepper / brightness). Verify with php -m | grep gd.

Install

Usage

All examples run with the default PHP memory limit — no -d memory_limit=2G flag is needed anymore (peak memory stays well under 128 MB even for 1.3 megapixel images).

01 Embed & Extract — String Watermark

Original image + watermark text = invisible watermark image.

Full example: 01_embed_extract_str.php

Output:

02 Embed & Extract — Bit-Array Watermark

Embed an arbitrary array of 0/1 bits (useful for custom protocols / binary payloads).

Full example: 02_embed_extract_bit.php

Output:

03 In-Memory Pipeline (No-Temp-Files)

Suited for web services: read host image from request / database, embed, return BGR data directly without touching disk.

Full example: 03_in_memory.php

Output:

04 Attack / Recover — Robustness Test

Demonstrates the watermark surviving common post-processing attacks, plus crop-and-recover.

Embedded image (host = origin.jpg, wm = 'This is a attack test'):

Attack results (watermark extracted successfully from every image below):

salt-pepper 2% brightness ×0.9 resize 940²→800×600
shelter 5 blocks @5% crop right 20% crop recovered

Full example: 04_with_attacks.php

Note on resize robustness: The resize attack uses GD's bilinear re-sampling. It works reliably on typical photographs with good tonal range (like origin.jpg, mean ≈ 120, stdev ≈ 40). It may fail on extremely uniform / near-solid-colour host images (e.g. mean > 250/255) because the relative watermark strength is too low to survive the low-pass filter. This is a fundamental limitation of the DWT-DCT-SVD blind-watermark paradigm, not a library bug. To verify resize robustness, run the example with origin.jpg as the host.

📮Email

[email protected]

Reference Project

https://github.com/guofei9987/blind_watermark

All versions of blind-watermark with dependencies

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Requires php Version >=8.1
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