This function is faster than the Stegancoder because the pixel locations are precomputed rather than encoded using counters as well as more secure because the message is encoded across the entire image instead of the left portion of the image. The function then uses the randperm list to encode the message values in the cover image. This ensures that we don't overwrite message values in the cover image and can recover the message during the decoding stage (see Stegandecoder_Rand). Myscript When you call a P-code file, MATLAB gives it execution precedence over its corresponding.m source file. To do this the function determines the dimensions of the cover image, multiplies the dimensions together to provide the number of pixels available and uses randperm to randomly permutate a list that includes values from 1 to the total pixel values available in a predicatable and repeatable way by using the same random seed key value. Then the function uses the randperm function to randomly select pixel locations to encode the message within. This function first determines the message type and length and encodes this as header information (first 24 randomly encoded values).
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