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浏览/检索结果: 共5条，第1-5条 帮助 限定条件 内容类型：会议论文     已选(0)清除 条数/页：5101520253035404550556065707580859095100   排序方式：请选择作者升序作者降序题名升序题名降序发表日期升序发表日期降序提交时间升序提交时间降序 STUDIES OF ECRIS ION BEAM FORMATION AND QUALITY AT THE DEPARTMENT OF PHYSICS, UNIVERSITY OF JYV¨ ASKYL¨A∗ 会议论文 Lanzhou, 2010-09-06 V. Toivanen†; V. Aho; J. Kauppinen; H. Koivisto; T. Ropponen‡; O. Tarvainen; J. A¨ rjeL; Celona; G. Ciavola; S. Gammino; D. Mascali; A. Galat`a 收藏  |  浏览/下载：19/0  |  提交时间：2011/07/12 Correction of the non-uniformity for multi-TDICCD mosaic camera on FPGA (EI CONFERENCE) 会议论文 2010 International Conference on E-Product E-Service and E-Entertainment, ICEEE2010, November 7, 2010 - November 9, 2010, Henan, China Zhu H.; Xue X.; Ma T.; Li H.; Si G.; Guo Y. 收藏  |  浏览/下载：21/0  |  提交时间：2013/03/25 To solve the non-uniformity problem of multi Time Delay Integral Charge Couple Device (TDICCD) mosaic camera  several common non-uniformity correction methods are discussed. Secondly  a non-uniformity correction algorithm is proposed and implemented on Field-Programmable Gate Array (FPGA) platform. Firstly  the correction algorithm is designed. Finally  the generation and definition of non-uniformity are introduced  considering the fix-point processing ability of FPGA  the correction algorithm is optimized properly  and implemented on FPGA. The experimental results indicate that the non-uniformity can be decreased from 8.3%to 2.0% in 1s for 3-TDICCD mosaic camera's images with the proposed correction algorithm at 96TDI stage  proving that this correction algorithm is of high real-time performance  good practicality and satisfies the requirements of the target system. 2010 IEEE.   Multi-channel high-speed TDICCD image data acquisition and storage system (EI CONFERENCE) 会议论文 2010 International Conference on E-Product E-Service and E-Entertainment, ICEEE2010, November 7, 2010 - November 9, 2010, Henan, China Zang J.; Li Y.; Xue X.; Guo Y. 收藏  |  浏览/下载：19/0  |  提交时间：2013/03/25 For multi-channel high-speed image data of certain space remote sensing camera  this paper proposed a new image data acquisition and storage system. First of all  the system uses Field-Programmable Gate Array(FPGA) controlling synchronous dynamic random access memory(SDRAM) array to realize the cache of image data  then according to the received commands  sends certain channel's image data to the acquisition card to write the image data into SCSI hard disk and implements the final storage. A Time Delay Integral Charge Couple Device(TDICCD) image data acquisition and storage system with five channels is developed  pixel clock rate is up to 96MHz  total effective data rate is up to 2.88Gb/s  single channel storage depth is up to 7810 lines. The experimental results indicate that this system work stably  high effectively which can meet the requirement of acquisition and storage of multi-channel high-speed TDICCD image data. 2010 IEEE.   Real-time adjusting of yaw angle of space camera based on General Image-Quality Equation (EI CONFERENCE) 会议论文 2009 2nd International Conference on Intelligent Computing Technology and Automation, ICICTA 2009, October 10, 2009 - October 11, 2009, Changsha, Hunan, China Wang J.; He X.; Xu S. 收藏  |  浏览/下载：18/0  |  提交时间：2013/03/25 A Strategy of Real-Time Adjusting of Yaw Angle (SRTAYA) of space camera was proposed base on General Image-Quality Equation (GIQE). During space camera imaging  yaw angle which is caused by rotation of the earth and the gesture changing of satellite impacts integral aspect of TDI (Time Delay and Integration) CCD (Charge Couple Device)  so that the image quality degrades. For extending imaging time of space camera and enhancing image quality  yaw angle must be adjusted. The descending value of GIQE reflects the degrading quantity of image quality. The SRTAYA calculated an acceptable augmenting value of yaw angle according with a specific value of GIQE  which the degrading of image quality can't be neglected no longer. The example which actualized a practical orbit of satellite illuminated that the SRTAYA could limit the value of yaw angle less than 318.45". 2009 IEEE.   Space camera imaging gain in-orbit adjusting strategy (EI CONFERENCE) 会议论文 2009 2nd International Conference on Intelligent Computing Technology and Automation, ICICTA 2009, October 10, 2009 - October 11, 2009, Changsha, Hunan, China He X.; Jin G.; Wang J. 收藏  |  浏览/下载：10/0  |  提交时间：2013/03/25 A Multi-Step Gain Adjusting Strategy (MSGAS) of space camera was proposed  which was used to get higher SNR (Signal-Noise Rate) image. When the space camera working in poor light condition  the CCD signal was so weak that it's difficult to get a clear image  to reduce the quantization noise and improve the SNR  we must amplify the CCD signal first and then quantize. The MSGAS was achieved by adjusting the gain of the CCD (Charge Couple Device) signal processor step by step  the upper limit and lower limit were set  if the MDN (Mean Digital Number) of a fixed length image data was not between the lower and upper limit  the gain was adjusted step by step. In the experiment  the upper limit  lower limit and the step were set  and the result of the experiment showed that MSGAS was robust and SNR was improved from 28 to 39. 2009 IEEE.