Image reader for a portable copier

An image reader comprising:

• a reading head being capable of scanning a document and which is comprised of detection means for generating pulses according to the movement of the reading head and an image sensor for reading the document image in a manner synchronized with pulses generated by the detection means,
• memory means for storing image data obtained by the image sensor,
• write control means for writing said image data into the memory means,
• image data processing means including dot count means for counting respective sums of real dot data aligned on individual dot lines of said document image and decision means for discriminating against image data contained in an area defined between two of said dot lines for respective sums of real dot data which is less than a predetermined sum value and writing image data greater than said predetermined sum value into the memory means whereby undesired noise data is removed from the image data read by the image sensor prior to writing image data into the memory means and thereafter printing an image of said document, and
• a printer for printing out a noise free image of the image data stored in the memory means.