In this report, we describe thin 200nm thick GaN film formation technology on Si which allows microbolometer
application. GaN layer with AlN buffer layer obtained by the MOCVD has TCR of about -0.64 %/°C and sheet
resistance of ~2800 ohm/sq. Acquired GaN films were analyzed by XRD, SEM, Hall measurement, and etc. The
successful growth of thin single crystalline or polycrystalline GaN film on Si can be a good semiconductor bolometric
material. And the multi wavelength detecting systems with GaN based devices including UV detector, power devices,
amplifier with GaN and AlGaN MOSFET, HEMT, and etc can be realized. We obtained thin(~200nm) crystalline GaN
layer on Si(111) with AlN buffer layers with FWHM(full width at half maximum) of ~1800 arcsec. And its bolometric
characteristic was analyzed.
We introduce an efficient mode selection method in the enhancement layers of spatial scalability in the SVC encoder by selectively performing the inter-layer residual coding of the SVC. The proposed method is to make an analysis of the characteristics of integer transform coefficients for the subtracted signals for two residuals from lower and upper spatial layers. Then it selectively performs the inter-layer residual prediction coding in the spatial scalability if the SAD values of inter-layer residuals exceed adaptive threshold values. Therefore, by classifying the residuals according to
the properties of integer-transform coefficients only with the SAD of inter-layer residual signals between two layers, the SVC encoder can perform the inter-layer residual coding selectively, thus significantly reducing the total encoding time with 51.2% in average while maintaining the RD performance with negligible amounts of quality degradation.
In this paper, a fast intermode decision scheme which is suitable for the hierarchical B-picture structure in which much computational power is spent for combined variable block sizes and bi-predictive motion estimation is introduced. The hypothesis testing considering the characteristics of the hierarchical B-picture structure in the proposed method is performed on 16x16 and 8x8 blocks to have early termination for RD computation of all possible modes. The early termination in intermode decision is performed by comparing the pixel values of current blocks and corresponding motion-compensated blocks. When the hypothesis tests are performed, the confidence intervals to accept the null hypothesis or not are decided according to the temporal scalability levels under the consideration of properties of hierarchical B-pictures. The proposed scheme exhibits effective early termination behavior in intermode decision of temporal scalabilities and leads to a significant reduction up to 69% in computational complexity with slight increment in bit amounts. The degradation of visual quality turns out to be negligible in terms of PSNR values.