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Privacy protected surveillance using secure visual object coding

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY 2008年第8期18卷 1152-1162页

作者： Martin, Karl Plataniotis, Konstantinos N. Univ Toronto Edward S Rogers Sr Dept Elect & Comp Engn Multimedia Lab Toronto ON M5S 3G4 Canada

This paper presents the Secure Shape and Texture SPIHT (SecST-SPIHT) scheme for secure coding of arbitrarily shaped visual objects. The scheme can be employed in a privacy protected surveillance system, whereby visual objects are encrypted so that the content is only available to authorized personnel with the correct decryption key. The secure visual object coder employs shape and texture set partitioning in hierarchical trees (ST-SPIHT) along with a novel selective encryption scheme for efficient, secure storage and transmission of visual object shape and textures. The encryption is performed in the compressed domain and does not affect the rate-distortion performance of the coder. A separate parameter for each encrypted object controls the strength of the encryption versus required processing overhead. Security analyses are provided, demonstrating the confidentiality of both the encrypted and unencrypted portions of the secured output bit-stream, effectively securing the entire object shape and texture content. Experimental results showed that no object details are revealed to attackers who do not possess the correct decryption key. Using typical parameter values and output bit-rates, the SecST-SPIHT coder is shown to require encryption on less than 5% of the output bit-stream, a significant reduction in computational overhead compared to "whole content" encryption schemes.

关键词： encryption privacy protection security set partitioning in hierarchical trees (SPIHT) shape adaptive coding shape and texture coding surveillance visual object coding wavelet-based coding

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SPIHT-based coding of the shape and texture of arbitrarily shaped visual objects

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IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY 2006年第10期16卷 1196-1208页

作者： Martin, Karl Lukac, Rastislav Plataniotis, Konstantinos N. Univ Toronto Edward S Rogers Sr Dept Elect & Comp Engn Multimedia Lab Toronto ON M5S 3G4 Canada

A new scheme for coding both the shape and texture of arbitrarily shaped visual objects is presented. Based on set partitioning on hierarchical trees (SPIHT), the proposed Shape and Texture SPIHT (ST-SPIHT) employs a novel implementation of the shape-adaptive discrete wavelet transform (SA-DWT) using in-place lifting, along with parallel coding of texture coefficients and shape mask pixels to create a single embedded code that allows for fine-grained rate-distortion scalability. The single output code simplifies the logistics of object storage and transmission compared to previously published schemes. An input parameter provides control over the relative progression between shape and texture coding in the embedded code, allowing for adjustment of the emphasis of shape versus texture quality in low bit rate reconstructions. The combination of features provided by ST-SPIHT, namely, explicit and progressive shape coding in parallel with wavelet-based embedded coding of the object texture, is unique compared to previously published schemes. Computational complexity is minimized since the shape coding takes advantage of the decomposition and spatial orientation trees used for texture coding. objective and subjective simulation results show that the proposed ST-SPIHT scheme has rate-distortion performance comparable or superior to MPEG-4 visual Texture coding for most bit rates.

关键词： set partitioning in hierarchical trees (SPIHT) shape-adaptive coding shape-adaptive discrete wavelet transform (SA-DWT) shape and texture coding visual object coding wavelet-based coding

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