能將讀入的圖檔變成灰階圖 也能將圖檔的pixel值以直方圖顯示-able to read into the gray-scale image files into image files can also map the pixel values in histogram display

The number of changing pixel rate (NPCR) and the unified averaged changed intensity (UACI) are two most common quantities used to uate the strength of image encryption algorithms/ciphers with respect to differential attacks. Conventionall