Recently, Lin and Tsai proposed a secret image-sharing scheme using steganography and a parity-checking detection mechanism to provide effective security for secret image sharing. In this paper, we present a robust authentication method to detect stego-images, while retaining the same high capacity of embedding information, with a cyclic redundancy check and hash function both being applied for authentication detection. As observed from our experiments, the quality of shares embedded in the stego-image in our scheme was higher than that of previous studies. Therefore, in terms of precise detection and higher PSNR measures, the requirements for both authentication and fidelity were satisfied.