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Image Indexing by Distributed Color Temperature Descriptions

100%

Wnukowicz K.

Fundamenta Informaticae

2004

tom Vol. 61, nr 3,4

369--378

The paper presents new methods for image content indexing by the use of color temperature feature. A descriptor for dominant color temperature is introduced, for which two types of queries are discussed: a query by color temperature value and a query by example. Finally, a data structure for search optimized storage of the introduced descriptor is proposed and evaluated.

Performance of multi camera views' detection using MPEG-7 visual signature tools

63%

Wnukowicz K. , Galiński G.

Opto-Electronics Review

2013

tom Vol. 21, No. 1

79-85

The paper presents experimental results for the detection of related video streams (views) of multi camera system using MPEG-7 visual signature tools. This detection can be used for identification of video streams stored in video repositories which constitute the same multi camera recording set. Two signature tools have been investigated: Image Signature descriptor and Video Signature descriptor. The motivation for the usage of the tools designed primarily for replica detection is the fact that the video material produced by multi camera system typically consists of a few related video streams which are similar to each other and, thus, the video streams produced by multi camera system can be regarded as semi-replicas as they contain predominantly the same scenes or objects recorded at the same time. Experiments show that only in some restricted scenarios of a multi camera system setup the MPEG-7 visual signature tools can be used for reliable detection of multi camera views. These reliable scenarios include systems having cameras with perpendicular optical axes and "far" scene.

Colour temperature estimation algorithm for digital images-properties and convergence

63%

Wnukowicz K. , Skarbek W.

Opto-Electronics Review

2003

tom Vol. 11, No. 3

193-196

The paper presents an algorithm for estimation of temperature of image. Colour temperature is important, perceptual feature describing colour and content of images. The main idea of the algorithm is to average pixel values of image, omitting the values which have meaningless influence on perception of colour temperature. It is done in an interactive procedure. The convergence of the procedure is discussed. The algorithm can be applied in image search/retrieval tasks and is proposed in the MPEG-7 colour temperature descriptor for estimation of colour temperature of images.

Detekcja kopii obrazu metodą cech lokalnych

63%

Wnukowicz K. , Skarbek W.

Elektronika : konstrukcje, technologie, zastosowania

2009

tom Vol. 50, nr 4

72-76

W artykule przedstawiono metodę detekcji kopii obrazów na podstawie treści wizualnej. W metodzie tej wyznacza się zwięzłą sygnaturę reprezentującą unikalną treść obrazu. Sygnatura ta jest odporna na wiele popularnych technik modyfikacji obrazów, które nie powodują istotnej utraty informacji, takich jak kompresja stratna, zmiana rozmiaru, poprawa kolorów, czy proste obroty. Wykrywanie kopii obrazów wykonuje się za pomocą szybkiego algorytmu porównywania ich sygnatur. Właściwości prezentowanej sygnatury, takie jak mały rozmiar, szybka metoda obliczania i detekcji oraz wysoka skuteczność wykrywania kopii, pozwalają na jej zastosowanie w aplikacjach zarządzania dużymi zbiorami obrazów, w tym również do wykrywania kopii obrazów w zasobach Internetowych.

The paper presents a method for image copy detection based on visual content. In this method a compact image signature is extracted, which represents unique image content. Te signature is robust to many common image processing techniques, which do not lead to significant loss of information, such as lossy compression, resizing, color enhancements and simple rotations. The detection of image copies is performed by a fast algorithm of signature matching. The properties of the presented signature, such as small size, fast extraction, fast matching, and high detection rate of image copies, allow the signature to be used in big image databases, including image resources on the Web.