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In this contribution a novel method for video error control and concealment is proposed. The system is based on the use of data hiding techniques for transmitting the extra information needed to recover the data lost during transmission. The embedded data is a sub sampled binary version of each key frame of the shot. The embedding is performed by using the Quantization Index Modulation (QIM) scheme...
In this paper a watermarking scheme based on the human visual system (HVS) is presented. A quantization index modulation - dither modulation scheme is used in the discrete cosine transform domain for the embedding. The watermark quantization step is selected according to the inter-frequency masking effect computed by using a HVS-inspired objective image quality metric. Experimental results demonstrate...
In this paper a new image enhancement method in the transform domain is proposed. The technique is based on sharpening the magnitude of the DCT coefficients and has been integrated into the JPEG compression process to improve the visual quality of the image before it is decompressed.
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