Objective Evaluation of Edge Blur and Ringing Artefacts: Application to JPEG and JPEG 2000 Image Codecs
نویسندگان
چکیده
This paper presents a method of objective evaluation of the edge blur and ringing artefacts produced by image codecs. It is difficult to detect and measure individual artefacts in coded images. A synthetic test image is developed to separate and measure edge blur and ringing artefacts due to image compression. The influence of pixel intensity gradient on the quality metrics is investigated, the test image has also been optimised to enhance sensitivity. The performance of five JPEG and JPEG2000 codec implementations is compared. All five codecs show an increasing level of artefacts with increasing compression ratio. Different implementations of a codec have different artefact characteristics. The objective quality measures can be used in the image codec development process and in parameter optimisation of codec performance. These metrics can also be used to select suitable parameters for video codecs such as MPEG-1, MPEG-2 and MPEG-4 when creating video streams for the Internet applications and in multimedia applications in general.
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