Method and circuit for signal processing of format conversion of picture signal

A method for signal processing of format conversion of a picture signal, which is for converting a format of an input picture signal into a predetermined display format of a picture output device, the method comprising the steps of:

• providing a picture signal of progressive scanning directly from the input picture signal when the input picture signal is of progressive scanning, and providing a picture signal of progressive scanning by converting the input picture signal into a picture signal of progressive scanning when the input picture signal is of interlace scanning;
• and
• performing a scaling operation of at least one of compression in a horizontal direction, expansion in a horizontal direction, compression in a vertical direction, expansion in a vertical direction, and frame rate conversion on the provided picture signal of progressive scanning in accordance with the format of the input picture signal and the predetermined display format of the picture output device;
• wherein the step of performing a scaling operation includes the step of controlling a scaling unit with signal processing parameters determined in accordance with the format of the input picture signal and the predetermined display format of the picture output device, the scaling unit including
• a controllable horizontal scaling unit for selectively performing the compression in the horizontal direction and the expansion in the horizontal direction depending on the signal processing parameters, and
• a controllable vertical scaling unit for selectively performing the compression in the vertical direction, the expansion in the vertical direction, and the frame rate conversion depending on the signal processing parameters.

A method for signal processing of format conversion of a picture signal, which is for converting a format of an input picture signal into a predetermined display format of a picture output device, the method comprising the steps of:

• providing a picture signal of progressive scanning directly from the input picture signal when the input picture signal is of progressive scanning, and providing a picture signal of progressive scanning by converting the input picture signal into a picture signal of progressive scanning when the input picture signal is of interlace scanning;
• and
• performing a scaling operation of at least one of compression in a horizontal direction, expansion in a horizontal direction, compression in a vertical direction, expansion in a vertical direction, and frame rate conversion on the provided picture signal of progressive scanning in accordance with the format of the input picture signal and the predetermined display format of the picture output device;
• wherein in performing the scaling operation,
• when the scaling operation of the compression in the horizontal direction is performed, the scaling operation of either one of the compression in the vertical direction and the expansion in the vertical direction is performed after performing the scaling operation in the horizontal direction, and
• when the scaling operation of the expansion in the horizontal direction is performed, the scaling operation of the expansion in the horizontal direction is performed after performing the scaling operation of either one of the compression in the vertical direction and the expansion in the vertical direction.

A method for signal processing of format conversion of a picture signal, which is for converting a format of an input picture signal into a predetermined display format of a picture output device, the method comprising the steps of:

• providing a picture signal of progressive scanning directly from the input picture signal when the input picture signal is of progressive scanning, and providing a picture signal of progressive scanning by converting the input picture signal into a picture signal of progressive scanning when the input picture signal is of interlace scanning;
• and
• performing a scaling operation of at least one of compression in a horizontal direction, expansion in a horizontal direction, compression in a vertical direction, expansion in a vertical direction, and frame rate conversion on the provided picture signal of progressive scanning in accordance with the format of the input picture signal and the predetermined display format of the picture output device;
• wherein signal processing of at least one of color space conversion and inverse gamma conversion is performed on a picture signal which has been subjected to the scaling operation.

A method for signal processing of format conversion of a picture signal, which is for converting a format of an input picture signal into a predetermined display format of a picture output device, the method comprising the steps of:

• providing a picture signal of progressive scanning directly from the input picture signal when the input picture signal is of progressive scanning, and providing a picture signal of progressive scanning by converting the input picture signal into a picture signal of progressive scanning when the input picture signal is of interlace scanning;
• and
• performing a scaling operation of at least one of compression in a horizontal direction, expansion in a horizontal direction, compression in a vertical direction, expansion in a vertical direction, and frame rate conversion on the provided picture signal of progressive scanning in accordance with the format of the input picture signal and the predetermined display format of the picture output device;
• wherein the input picture signal is a component signal of either one of 4:2:2 and 4:2:0 including a luminance signal and color difference signals.

A circuit for signal processing of format conversion of picture signal which performs signal processing of converting a format of an input picture signal into a predetermined display format of a picture output device, said circuit comprising:

• a scanning convertor for performing first local signal processing of converting the input picture signal into a picture signal of progressive scanning when the input picture signal is of interlace scanning;
• a first selector for selecting either one of the input picture signal and the picture signal of progressive scanning outputted from the scanning convertor;
• a scaling unit comprising a horizontal scaling unit for performing second local signal processing of compression and expansion in a horizontal direction to a signal selected by the first selector and a vertical scaling unit performing third local signal processing of compression and expansion in a vertical direction to thereof;
• and
• a control unit for selecting parameters of the signal processing in accordance with the format of the input picture signal and the display format of the picture output device and controlling at least the scanning convertor, the first selector and the scaling unit in accordance with the parameters of the signal processing, further comprising:
• a multi processing unit for inputting a first picture signal and a second picture signal both having a same format and performing fourth local signal processing of multiplexing the first picture signal and the second picture signal into a time-division multiplex signal during one scanning line period;
• a second selector for constituting the input picture signal by selecting either one of the first picture signal and the time-division multiplex signal outputted from the multi processing unit;
• and
• wherein the control unit is constituted to have the scanning convertor, the first selector and the scaling unit perform the signal processing to the first picture signal in case of one window display and perform the signal processing to the time-division multiplex signal outputted from the multi processing unit in case of double windows.

A method for signal processing of format conversion of picture signal, which is for converting a format of an input picture signal into a predetermined display format of a picture output device, said method comprising the steps of:

• performing signal processing of multiplexing a first picture signal and a second picture signal both having a same format to a time-division multiplex signal during one scanning line period;
• constituting the input picture signal by selecting either one of the first picture signal and the time-division multiplex signal;
• providing a picture signal of progressive scanning directly from the input picture signal when the input picture signal is of progressive scanning and providing a picture signal of progressive scanning by converting the input picture signal into a picture signal of progressive scanning when the input picture signal is of interlace scanning;
• and
• performing a scaling operation of at least one of compression in a horizontal direction, expansion in a horizontal direction, compression in a vertical direction, expansion in a vertical direction and frame rate conversion to the provided picture signal of progressive scanning in accordance with the format of the input picture signal and the predetermined display format of the picture output device.

A circuit for signal processing of format conversion of picture signal which performs signal processing of converting a format of an input picture signal into a predetermined display format of a picture output device, said circuit comprising:

• a first convertor for converting the input picture signal into a transmission scanning line signal transmitted in interlace scanning and an interpolation scanning line signal formed by interpolating scanning lines skipped in interlace scanning when the input picture signal is of interlace scanning;
• a second convertor for converting the input picture signal into a transmission scanning line signal transmitted in interlace scanning and an interpolation scanning line signal formed by interpolating scanning lines skipped in interlace scanning when the input picture signal is of progressive scanning;
• a third selector for selecting either one of a set of the transmission scanning line signal and the interpolation scanning line signal outputted from the first convertor and a set of the transmission scanning line signal and the interpolation scanning line signal outputted from the second convertor;
• a scaling unit comprising a horizontal scaling unit for performing second local signal processing of compression in a horizontal direction and expansion in a horizontal direction to each of signals selected by the third selector and a vertical scaling unit for performing third local signal processing of compression in a vertical direction and expansion in a vertical direction to thereof;
• a multiple scan convertor for converting signals outputting from the scaling unit into a signal of progressive scanning by fifth local signal processing of time-division multiplex with compressing a time axis by 1/2;
• and
• a control unit for selecting parameters of the signal processing in accordance with the format of the input picture signal and the predetermined display format of the picture output device and controlling at least the first convertor, the second convertor, the third selector, the scaling unit and the multiple scan convertor in accordance with the parameters of the signal processing.