Jas Per软件是最新的静态图像压缩标准JPEG2000的实现,它提供了一种表示图像的方法,可以处理图像数据以及以各种格式输入输出。文章介绍了JasPer概况,特点,分析了软件核心Jas Per library,详细地讨论了Jas Per的应用,并利用软件得出在JP...Jas Per软件是最新的静态图像压缩标准JPEG2000的实现,它提供了一种表示图像的方法,可以处理图像数据以及以各种格式输入输出。文章介绍了JasPer概况,特点,分析了软件核心Jas Per library,详细地讨论了Jas Per的应用,并利用软件得出在JPEG2000中,小波变换分解层次为5或者6的时候压缩效果(PSNR)相对最优;代码块越大,压缩效果(PSNR)越好。最后指出了JasPer软件不足的地方,提出了改进的方案。展开更多
The separation of iron oxide from banded hematite jasper(BHJ) assaying 47.8% Fe, 25.6% Si O2 and 2.30%Al2O3 using selective magnetic coating was studied. Characterization studies of the low grade ore indicate that bes...The separation of iron oxide from banded hematite jasper(BHJ) assaying 47.8% Fe, 25.6% Si O2 and 2.30%Al2O3 using selective magnetic coating was studied. Characterization studies of the low grade ore indicate that besides hematite and goethite,jasper, a microcrystalline form of quartzite, is the major impurity associated with this ore. Beneficiation by conventional magnetic separation technique could yield a magnetic concentrate containing 60.8% Fe with 51% Fe recovery. In order to enhance the recovery of the iron oxide minerals, fine magnetite, colloidal magnetite and oleate colloidal magnetite were used as the coating material. When subjected to magnetic separation, the coated ore produces an iron concentrate containing 60.2% Fe with an enhanced recovery of56%. The AFM studies indicate that the coagulation of hematite particles with the oleate colloidal magnetite facilitates the higher recovery of iron particles from the low grade BHJ iron ore under appropriate conditions.展开更多
文摘Jas Per软件是最新的静态图像压缩标准JPEG2000的实现,它提供了一种表示图像的方法,可以处理图像数据以及以各种格式输入输出。文章介绍了JasPer概况,特点,分析了软件核心Jas Per library,详细地讨论了Jas Per的应用,并利用软件得出在JPEG2000中,小波变换分解层次为5或者6的时候压缩效果(PSNR)相对最优;代码块越大,压缩效果(PSNR)越好。最后指出了JasPer软件不足的地方,提出了改进的方案。
文摘The separation of iron oxide from banded hematite jasper(BHJ) assaying 47.8% Fe, 25.6% Si O2 and 2.30%Al2O3 using selective magnetic coating was studied. Characterization studies of the low grade ore indicate that besides hematite and goethite,jasper, a microcrystalline form of quartzite, is the major impurity associated with this ore. Beneficiation by conventional magnetic separation technique could yield a magnetic concentrate containing 60.8% Fe with 51% Fe recovery. In order to enhance the recovery of the iron oxide minerals, fine magnetite, colloidal magnetite and oleate colloidal magnetite were used as the coating material. When subjected to magnetic separation, the coated ore produces an iron concentrate containing 60.2% Fe with an enhanced recovery of56%. The AFM studies indicate that the coagulation of hematite particles with the oleate colloidal magnetite facilitates the higher recovery of iron particles from the low grade BHJ iron ore under appropriate conditions.
