Improved Qualitative Color Image Steganography Based on DWT

In this paper we propose a new steganography technique which embeds secrete color image into color cover work in frequency domain. Unlike the spatial domain approach, secrete image or data are embedded in the low frequency coefficients resulted from Discrete Wavelet Transform, as it is much sensitive to Human Visual System several researchers are not preferring to embed data in low frequency coefficients. This low frequency region provides excellent secure location for data hiding. So, firstly detecting low frequency region is performed in cover images and then Secret image, data embedding will be performed in Discrete Wavelet Transform domain as Discrete Wavelet Transform gives better performance than Discrete Cosine Transform while compression. Watermark algorithm is implemented in two way using Single level Discrete Wavelet Transform and Three levels Discrete Wavelet Transform taking single plane of the cover image for embedding secrete image or data as 4X4 blocks. Experimental results show that Peak Signal Noise Ratio generated by proposed method is better than previous with large amount data embedding.