New steps of image quality enhancement and evaluation in video applications

The paper presents results of authors' studies in the field of image quality in light of new technologies of image capturing, production, processing, delivery and reproduction in TV and related video applications. With coming era of UHDTV, HDR-TV and 3D-TV the approaches for image rendition quality are being changed together with progress of video technology and with changing image viewing conditions at the transmission and repro-duction ends of light-to-light video chain. There are the proposals for the use to assess color ren-dition fidelity of colorimetric models covering of color ap-pearance conditions in the traditional luminance range, for which models of photopic mechanism of color vision are functioning, in the luminance range of glares corresponding to the model of perception of unrelated colors, as well as in the luminance range in the area corresponding to the mesopic and scotopic perception model. It is proposed to build the test materials and assessment criteria, which would allow to give a separate estimate for the three mentioned are-as. Estimations of color appearance metric for traditional dynamic range systems are get. The tasks for more complete evaluation of color fidelity, taking into account the mentioned problems, are set. Estimates of the relative color gamut area with consideration of color appearance model are made. Examples of constructing sets of colors, uniformly filling a region of colors transmit-ted by TV systems, are provided. The issues of the possible use new types of systems, adaptive to the properties of transmitted scenes and conditions of image perception at the transmitting, receiving sides and at intermediate points of video path are discussed. Ar-guments for the use of image quality evaluation methods in view of adaptability are provided. The problem of implementation object-oriented approach to the transmission scenes in the case of the mesh presentation natural objects model is considered. An example of the mesh representation scene is shown. The comparative eval-uation of the efficiency mesh representation and presentation in the traditional media still image compression systems of objects is given. The problem of image quality in the case of a com-pressed image representation using wavelet analysis techniques is considered. The example of assessment for possi-ble compression methods using a variety of approaches to its implementation is given.