Fig. 1. Luminance masking test image

Fig. 2. Contrast masking test image

Fig. 3. Results of visual experiment. (a) JND-luminance; (b) JND-eccentricity; (c) JND-contrast; (d) JND-block size

Fig. 4. Relationship among JND and different parameters. (a) Relationship among JND, luminance and eccentricity; (b) relationship among JND, luminance and contrast; (c) relationship among JND, block size and eccentricity

Fig. 5. CB-FJND model noise injection. （a） Original image； （b） noise injection with 3 pixel×3 pixel block； （c） noise injection with 5 pixel×5 pixel block； （d） noise injection with 7 pixel×7 pixel block； （e） result of Ref. ［7］ model； （f） results of Ref. ［9］ model

Fig. 6. Lena bit-plane images. (a) 23 bit-planes; (b) 25 bit-planes

Fig. 7. Distribution of bit16 before and after modification of

Fig. 8. Comparison of compression effect and partially enlarged image. (a) Algorithm in Ref. [10]; (b) cruciate block compression algorithm (19 subfields); (c) cruciate block compression algorithm (25 subfields)

Fig. 9. Hardware implementation system block diagram

Fig. 10. Picture of FPGA test platform

Fig. 11. Image compression effect and detail enlargement comparison of Lena. (a) Algorithm in Ref. [10]; (b) our algorithm (19 subfields); (c) our algorithm (25 subfields)