a method of error processing is disclosed in which the first erroneous lineetected in a facsimile transmission is decoded , and printed in the normal manner , up to the point in the line where an error is detected . an erroneous portion of the line is then defined to be the point in the line from which the error is detected as well as four color changes to the left . this erroneous portion is replaced by the corresponding picture elements in the immediately preceding line . the resulting &# 34 ; corrected &# 34 ; line is then used as a new &# 34 ; previous line &# 34 ; and the process is repeated with the erroneous portion of each subsequent line being replaced with white until a full line is properly decoded .