Protecting the content integrity of digital imagery with fidelity preservation

Abstract

Fragile watermarking is applied to protect the content integrity of digital images. The main concerns related to watermarking include retaining the quality of the watermarked image and retaining the ability to detect whether any manipulation has occurred. Because recent watermarking techniques seriously distort the quality of the protected image after embedding the authentication code into the image content, attention has been drawn to how to satisfy both the need for image fidelity and detection ability. To account for the influence from both essentials, a novel algorithm is proposed in this article. The new scheme utilizes a weighted-sum function to embed ( n + 1) authentication bits into a block with 2 n pixels by modifying only one original pixel with (±1). With fewer authentication codes, the new process can protect the content of the image. The experimental results demonstrate that the approach can guarantee the fidelity of the watermarked image while retaining tamper-proof functionality.

Two-Layer Fragile Watermarking Method Secured with Chaotic Map for Authentication of Digital Holy Quran

“…It is known that the watermark length of l m is influenced by the selected hash function. In this regard, simple function is required to select the bits sequentially with respect to n parameter ( n value is same as in step (iii)) as defined below: $\begin{array}{c}W=\{\begin{array}{cc}{\text{LSBit}}_{\mathrm{normal1}\dots n},\hfill & n\le \mathrm{normal8},\hfill \\ {\text{LSBit}}_{\mathrm{normal1}\dots \mathrm{normal8}},\hfill & n>\mathrm{normal8}.\hfill \end{array}\end{array}$ The selected authentication bits W are hidden into the wavelet coefficients using weighted-sum function, f ( x ) [17]. The block of wavelet coefficients is fed into weighted-function and then the resulting value is compared with selected authentication bits; both values are treated in decimal form.…”

Alpha Channel Fragile Watermarking for Color Image Integrity Protection

“…The method presented in [5] and improved in [6] is an efficient fragile watermarking method in the spatial domain that produces watermarked images with the highest theoretical quality. This method can be used to watermark each channel separately (including the alpha channel).…”

A successful attack and revision of a chaotic system based fragile watermarking scheme for image tamper detection

“…In the last years numerous image authentication techniques have been devised in pixel domain [1,2] and transform domain, e.g., the Karhunen-Loève transform, [3,4]. Soft computing techniques [5] have been extensively used to improve the efficiency of the watermarking schemes [6][7][8].…”