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Downsampling

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When considering a sampled sequence with zero values between sampling instants, one can replace it by taking every N-th value of the sequence. At these integer multiples of N, the original and sampled sequences coincide. This process, known as decimation, involves extracting every N-th sample from a sequence, thereby creating a more efficient sequence.
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Aliasing

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Related Experiment Video

Updated: Jun 4, 2026

High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques

High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques

Published on: December 3, 2013

Composite model-based DC dithering for suppressing contour artifacts in decompressed video.

Xin Jin¹, Satoshi Goto, King Ngi Ngan

¹Information Technology Research Organization, Waseda University, Fukuoka, Japan. xjin@aoni.waseda.jp

IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society

|February 18, 2011

Summary

This summary is machine-generated.

This study introduces a novel block-based decontouring method to reduce false contour artifacts in images and videos. The technique dithers the direct current (DC) value, significantly improving subjective visual quality without impacting texture regions.

Related Experiment Videos

Last Updated: Jun 4, 2026

High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques

High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques

Published on: December 3, 2013

Area of Science:

Digital Image Processing
Video Compression Standards

Background:

Block-based quantization is crucial for image/video compression efficiency.
False contour artifacts degrade decoded image/video fidelity and subjective quality.

Purpose of the Study:

To propose a block-based decontouring method to reduce false contour artifacts.
To improve the subjective quality of decoded images and videos.

Main Methods:

A composite model correlating gradient smoothness and block-edge smoothness is established.
Direct current (DC) values are automatically dithered based on the composite model.
Discrete Cosine Transform (DCT)-based detection prevents artifact reduction in texture regions.

Main Results:

The proposed method effectively reduces false contour artifacts.
Demonstrated good consistency between the model and actual processing effects.
Experimental results show improved subjective quality and comparable processing complexity.

Conclusions:

The proposed decontouring method is effective in enhancing image/video quality.
The method is feasible for integration into existing video decoders on embedded platforms or SoCs.
Offers a viable solution for artifact reduction in block-based video coding.