Image processing apparatus having function of enlargement and/or shrinkage of image

An image processing apparatus performing an enlarging operation comprising;

• an input means for receiving a plurality of input bits representing an image to be enlarged;
• a shift means coupled to said input means for shifting said input bits by a bit number determined by an enlargement scale factor;
• a plurality of gate circuits gating a plurality of bits which are the same in number as said input bits and contain two or more bits having the same content as that of at least the first bit of the shifted input bits;
• a means for selecting one of said gate circuits according to said enlargement scale factor to activate the selected gate circuit;
• and
• an output means coupled to said gate circuits for outputting the bits which pass through the selected gate.

An image processing apparatus comprising a first register temporarily storing input data representing an image and comprising N bits, N being an integer;

• a plurality of gate circuits, the number of which is smaller than N by one, first one to (N-1)th one of said gate circuits respectively gating one bit to (N-1) bits among said N bits of said input data;
• decoder decoding shrinkage data representative of a shrinkage scale factor and selecting one of said gate circuits to open the selected gate circuit;
• and
• means for producing shrunk data comprising said N bits in response to a bit or bits transferred from said selected gate circuit,
• said producing means including a temporary register from which said shrunk data is derived, a rotator shifting the bit or bits transferred from said selected gate circuit by a value determined by said shrinking scale factor, means for writing the shifted bit or bits into vacant bit position or positions of said temporary register, and means for reading out the content of said temporary register as said shrunk data when all the bits of said temporary register are filled.