To output processed image, stored in an image memory in the unit of fields in real time and to prevent image deterioration resulting from image processing for each field.

Data corresponding to a zoom magnification, an offset selected by a 1st selector 100 or a fraction part outputted from an adder 102 are given to the adder 102, and a part of the result of arithmetic operation which is integers is given to an address counter 104. The count of the address counter 104 is incremented by 2 or 4, depending on the received integral part, and when no integral part is received, a 2nd selector 110 selects an output of an adder 106 summing the count and '1', and when the integer part indicates '2', the 2nd elector 110 selects an output of a subtractor 108 which is a sum of the count and -1, and when the integral part indicates '1', the count is selected and the selected value is outputted as a vertical read address of the image memory 16 respectively.