| 摘要 |
An image signal processing apparatus is provided to prevent the damage of the line sharpness of an image when an image signal of an interlace type is converted into an image signal of a progressive type. A line memory(1) stores an interlace signal. A write and read unit includes a memory write control circuit(2) and a memory read line selector control circuit(3). The write and read unit writes the interlace signal in the line memory(1), and reads the interlace signal from the line memory(1). A signal generating unit having a power voltage level generating unit(4) and a ground level generating unit(5) generates a desired signal. A multiplexer(6) selectively outputs the interlace signal from the line memory(1) and the signal from the signal generating unit. A multiplexer control circuit(7) controls the signal selection of the multiplexer(6). When an odd field of the interlace signal is read from the line memory(1), the multiplexer control circuit(7) controls the multiplexer(6) to output the interlace signal from the line memory(1) to odd columns of a progressive signal to be converted and output the desired signal from the signal generating unit to even columns of the progressive signal. When an even field of the interlace signal is read, the multiplexer control circuit(7) controls the multiplexer(6) to output the interlace signal from the line memory(1) to the even columns of the progressive signal and output the desired signal from the signal generating unit to the odd columns of the progressive signal. |
