Utilization filtering to increase capacity message on PVD (Pixel Value Differences) steganography
Pemanfaatan filterisasi untuk meningkatkan daya tampung pesan pada steganografi Pixel Value Differences (PVD)
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On technique Pixel Value Differences (PVD) steganography before the secret message is inserted, the cover image of the first divided into blocks that do not overlap each other (non-overlapping pixel blocks). The excess value of the pixel is used to determine the amount of message bits that can be inserted. If the difference is large, then the message can be inserted in large numbers and vice versa. Image processing operations may affect the difference in value of adjacent pixels in an image. Therefore, by applying the filter in the PVD steganography is expected to increase the capacity of the message which is owned by a cover. Filtering done to the cover before the message is inserted. Type of filtration used is blur, emboss, and sharp. Research shows sharp have greatest increase their capacity without degrading performance value of Peak Signal to Noise Ratio (PSNR). Steganography application which developed is used in the process of inserting message, extracting messages, measuring the capacity of the message and PSNR value.