Figure 4From: Logistic Map-Based Fragile Watermarking for Pixel Level Tamper Detection and ResistanceSimulation results. (a) Original "UNCG" image of size 256 × 256 pixels, (b) tamper data and their locations, (c) proposed watermark and tampered data–PSNR = 37.74 dB, (d) Zhang-Wang watermark and tampered data–PSNR = 37.87, (e) tampered pixels detected by AgTDM, and (f) tampered pixels detected by ZW approach.Back to article page