HJ1B-CCD影像的质量评估及分析

Quality Evaluation and Analysis of HJ1B-CCD Images

采用了2009年10月21日同一天获取的浙江中部同一地区的TM与HJ1B-CCD(环境星)的数据,利用主观质量评价和客观质量评价两种图像质量评价方法,对HJ1B-CCD图像与TM1-4波段图像进行了对比评价。主观质量评价方法选取清晰度、反差、地物识别度、地面分解力4个评价指标;客观质量评价方法选取了辐射精度、清晰度、信息量、信噪比、地面分解力5个数据质量评价指标。研究结果表明:HJ1B-CCD图像与TM图像在清晰度、信息量及地面分解力方面能力近似,在辐射精度及信噪比方面低于TM图像。结合NDVI指数对比,相对于HJ1B与TM3、TM4的结果评价,HJ1B图像第3、4波段质量要好,HJ1B在植被识别等应用方面有较好的应用前景。

TM and HJ1B-CCD images of the central Zhejiang acquired on October 21,2009 were used in this study.Based on subjective and objective evaluation,the image quality of the HJ1B CCD image and TM 1-4 band image were compared and evaluated.Evaluation indicators used in the subjective quality evaluation are clarity,contrast,object recognition degree,and ground resolution;evaluation indicators used in the objective quality evaluation are radiation accuracy,clarity,information quantity,signal to noise ratio,and ground resolution.The results show that HJ1B-CCD image has the similar image quality in clarity,information quantity,and ground resolution as TM image,but has less good quality in radiation accuracy and signal to noise ratio compared with TM image.By using NDVI,we found that HJ1B image has better quality in band 3 and band 4,and HJ1B has a good application prospect in vegetation recognition.