The service life of cone bits which play an important role in breaking rock of the bottom of a well is almost directly decided by the life of bit bearing, which depends a large extent to the life of their seals.
We analyze the property of the remote sensing image and the rule of wavelet coefficients, give a way to quantify the wavelet coefficients and obtain a bit distribution method, and we have treated with the remote sensing image successfully with the method of ROI codec.
Based on the algorithm above, the region of interest coding algorithm on bit-plane shift is then discussed, which can maintain most important information of images in the circumstances of low bit rate.
We analyze the property of the remote sensing image and the rule of wavelet coefficients, give a way to quantify the wavelet coefficients and obtain a bit distribution method, and we have treated with the remote sensing image successfully with the method of ROI code.
In order to prevent variation of the zero position on an azimuth dial(encoding disk),an antitwisting thin film is applied to the vertical shaft system of a large sized theodolite. With the action of the azimuth torsion torque M kp of 1176N·m,the torsion deformation cannot fulfill 0.6″ accuracy demand of 21bit encoder. During leveling,if the radial bending force is too large,it will damage the anti twisting thin film itself;
Experimental results show that the proposed approach can reduce the computational cost of full search and fast multi-block motion estimation by 80 % and 45 %, respectively, with similar visual quality and bit rate.
The proposed algorithm also reduces by 75 % the computational cost of the large-small mode isolation algorithm for low-motion sequence coding, and with 0.06 PSNR gain and 3.7 % reduction in bit rate.
In underwater acoustic communication, because the available bandwidth of the channel is severely limited, the direct-sequence spread-spectrum scheme can only be realized at low bit rates.
The bit error performance is correlative not only with the interference-signal ratio (ISR), the frequency offset and the phase of the CW interference sensitively, but also with the individual spread spectrum code sequence.
DCT_M model for excitation parameter in low bit rate vocoder