This paper has proposed two image compression and decompression schemes for multispectral images. Two issues were considered in the proposed methods. The first issue is the possibility of applying the compression proc...
详细信息
ISBN:
(纸本)0819442798
This paper has proposed two image compression and decompression schemes for multispectral images. Two issues were considered in the proposed methods. The first issue is the possibility of applying the compression process directly to a set of multispectral images, where the standard JPEG should be applied to each individual image. Considering this issue, a compression and decompression method is proposed based on a hybrid of lower bit suppresion and Karhunen-Loeve transform and named as KLT Hybrid. The second issue is the possibility of obtaining a general codebook for a bulky of typical data such as a set of hyperspectral images. Considering this issue, another compression and decompression method is proposed based on vector quantization (VQ) where the general codebook is obtained by a proposed fair-share amount method. Four performance indicators were used to evaluate the results. The indicators include compression ratio, root mean square error, maximum absolute error, and signal to noise ratio. The experimental results have shown good performance indication of both methods.
The VCS (Video Coding System)-developed by NEC this time is equipped with;various operation modes. It also realized a high-speed multifunction image display function in the VCD (Video Coding Desk) to improve coding ef...
详细信息
The VCS (Video Coding System)-developed by NEC this time is equipped with;various operation modes. It also realized a high-speed multifunction image display function in the VCD (Video Coding Desk) to improve coding efficiency. For the postal service in Japan;to meet the introduction of the new processing system, NEC has developed a VCS with additional functions to meet the characteristics of domestic mail and operation flow such as priority coding, separate coding, koaza (a section of a village) coding and large volume coding. For the postal service abroad, NEC has developed a VCS with an additional function to search address codes rapidly from mass storage address database, because an address searching function in extract coding method was-essential to meet the more detailed address level objective for coding.
暂无评论