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Analiza obrazu termowizyjnego uzyskanego w wyniku strumieniowania

Onoszko K., Lis M.

Elektronika : konstrukcje, technologie, zastosowania

2013

Vol. 54, nr 10

63-66

Artykuł opisuje problem zmian kolorystyki obrazów przesyłanych z użyciem strumieni multimedialnych. Analizie zostaje poddany obraz uzyskany z kamery termowizyjnej, na którym znajduje się pasek palety barw. Monitorując zmiany tego fragmentu, zostaje przeprowadzona próba oceny wpływu algorytmu kompresyjnego na jakość odwzorowania barw. W tekście zaproponowany również został sposób na niwelację negatywnego wpływu kompresji.

Article describes the problem changes color images transmitted using multimedia streams. It analyzes the image from the infrared camera, where is a stripe color palette. Observing changes in this passage, is carried out an attempt to assess the impact of compression algorithms on fidelity color. The text has proposed a way to remove the negative effects of compression.

On a predictive scheme for colour image quantization

Hu Y. C., Chen W. L., Lo C. C., Wu C. M.

Opto-Electronics Review

2012

Vol. 20, No. 2

159-167

In this paper we proposed an improved colour image quantization scheme based on predictive coding. Since the neighbouring colour pixels are quite similar in most colour images, the similarity among the encoded pixels is exploited. In the proposed scheme the encoded distinct neighbouring colours are collected to form a smaller state-palette. If the closest colour in the state-palette is quite similar to the current encoding colour pixel, the index of the closest colour in the state-palette is recorded. Otherwise, the closest colour in original colour palette for the current encoding colour pixel is searched and the corresponding index is recorded. The experimental results show that the proposed method achieves good image qualities while requiring much lower bit rates for colour image compression.

Variable-rate colour image quantization based on quadtree segmentation

Hu Y. C., Li C. Y., Chuang J. C., Lo C. C.

Opto-Electronics Review

2011

Vol. 19, No. 3

282-289

A novel variable-sized block encoding with threshold control for colour image quantization (CIQ) is presented in this paper. In CIQ, the colour palette used has a great influence on the reconstructed image quality. Typically, a higher image quality and a larger storage cost are obtained when a larger-sized palette is used in CIQ. To cut down the storage cost while preserving quality of the reconstructed images, the threshold control policy for quadtree segmentation is used in this paper. Experimental results show that the proposed method adaptively provides desired bit rates while having better image qualities comparing to CIQ with the usage of multiple palettes of different sizes.