Based on definitions of AMBTC, the quantization level a is smaller than quantization level b.
Table 1 shows the PSNR values for the six test images compressed by the AMBTC algorithm with blocks of size 2 x 2, 4 x 4, and 8 x 8.
In the future, we will try to propose an adaptive image authentication scheme for AMBTC compressed images, which can offer high quality for AMBTC compressed images with different block sizes.
In addition, the AMBTC scheme was used to compress the original images.
Table 1 shows the visual qualities of images obtained by the AMBTC scheme  with three different values of n, i.
s scheme irrespective of the size of blocks used in the AMBTC compression technique.
Although the coding bit rate is much higher than JPEG and VQ, AMBTC can be performed very fast.
i] will be less significant in the AMBTC reconstruction process.
i]=0, then the AMBTC is used to encode the block [x.
i]) is encoded by AMBTC, obtaining its mean value [m.