Required Number of Quantization Bits for CIE XYZ Signals Applied to Various Transforms in Digital Cinema Systems
| Autor: | Junji Suzuki, Isao Furukawa |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Color difference
Image quality Computer science Applied Mathematics Quantization (signal processing) ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION Computer Graphics and Computer-Aided Design Luminance Bit field Effective number of bits Computer graphics (images) Signal Processing Color depth Electrical and Electronic Engineering Digital cinema Algorithm |
| Zdroj: | IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences. :1072-1084 |
| ISSN: | 1745-1337 0916-8508 |
| DOI: | 10.1093/ietfec/e90-a.5.1072 |
| Popis: | To keep in step with the rapid progress of high quality imaging systems, the Digital Cinema Initiative (DCI) has been issuing digital cinema standards that cover all processes from production to distribution and display. Various evaluation measurements are used in the assessment of image quality, and, of these, the required number of quantization bits is one of the most important factors in realizing the very high quality images needed for cinema. While DCI defined 12 bits for the bit depth by applying Barten's model to just the luminance signal, actual cinema applications use color signals, so we can say that this value has an insufficient theoretical basis. This paper, first of all, investigates the required number of quantization bits by computer simulations in discrete 3-D space for the color images defined using CIE's XYZ signal. Next, the required number of quantization bits is formulated by applying Taylor's development in the continuous value region. As a result, we show that 13.04 bits, 11.38 bits, and 10.16 bits are necessary for intensity, density, and gamma-corrected signal quantization, respectively, for digital cinema applications. As these results coincide with those from calculations in the discrete value region, the proposed analysis method enables a drastic reduction in the computer simulation time needed for obtaining the required number of quantization bits for color signals. |
| Databáze: | OpenAIRE |
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