The Key Laboratory for Special Fiber and Fiber Sensor of Hebei Province;
School of Information Science and Engineering;
Yanshan University;
Qinhuangdao 066004;
Hebei;
China;
China Academy of Electronics and Information Technology;
Beijing 100041;
China;
School of Electrical Engineering;
Yanshan University;
Qinhuangdao 066004;
Hebei;
China;
thermal; microscope; imaging; system; optical; micro-scanning; local; gradient; image; reconstruction; second-order; oversampling; reconstruction; spatial; resolution;