Impact and Analysis on the Environmental Constraints of Program Environmental Impact Assessment
In China,the environmental impact assessment(EIA) of construction project has been relatively mature,but the PEIA,without a uniform and standard system of theory and method,is still frontiers.Combined with theoretical study and example verification,on the basis of analysis about the meaning of PEIA and the meaning of studying environmental constraints,taking the Environmental Impact Assessment in Jiadong,Jiabei industrial park planning of Jiayuguan as an example,the development of Jiadong,Jiabei industrial park was systemically analyzed from the perspective of environmental constraints.And the environmental constraints of the development of industrial park were deeply discussed from the aspects of natural environment,environmental quality and social environment.Finally,some countermeasures to be taken to environmental constraints were discussed.
Image enhancement is one of the most important techniques in digital image processing field. Traditional global histogram equalization usually causes excessive contrast enhancement while local histogram equalization may cause block effect. So a new image enhancement technique based on human visual properties is proposed which improves contrast and edges in an image as well as keeps the noise level lower.