Fig. 1. Experiment setup of two spectrum imaging method on XG -Ⅲ facility

Fig. 2. Bremsstrahlung backlit imaging (original image, corrosion of flat disc structure with radius of 5, 10 and 20 pixel respectively)

Fig. 3. Bremsstrahlung backlit imaging (respectively open operation, close operation, open first and then close operation and close first and then open operation, 3×3 operator structure)

Fig. 4. Image by pinhole CCD