After thinking about it, it occurred to me there may be a way to generate picture WITHOUT video by using the width of the serial monitor display as a scan limit. Read the values and display them across using an array counter. When the last value is read and the counter reaches the limit of serial print() values in one line, it prints the last value using Serial.println(). stop the scan and light and led to tell the operator to start another scan from left to right . He pushes a button to start his scan and scans again until the led lights. When the line counter reaches the limit of rows that can be displayed, the second led lights indicating SCAN COMPLETE.
The only catch is finding a way to prevent any values from being read in until you place on the skin. Also, preventing more than one value from being recorded in the same location. Maybe you can figure that out Mike....