Image display apparatus, signal processing apparatus, image processing method, and computer program product

A signal processing apparatus for generating an image signal, comprising:

• an interlace-to-progressive converter configured to perform signal conversion processing for receiving an interlace signal to convert the interlace signal into a progressive signal including information on interpolated pixels generated by interpolation processing;
• a frame controller configured to divide an input image frame in a time-division manner to generate a plurality of sub-frames;
• a high-frequency-enhanced sub-frame generator configured to perform filtering processing on the plurality of sub-frames generated by the frame controller to generate high-frequency-enhanced sub-frames;
• a high-frequency-suppressed sub-frame generator configured to perform filtering processing on the plurality of sub-frames generated by the frame controller to generate high-frequency-suppressed sub-frames;
• a first output controller configured to alternately output the high-frequency-enhanced sub-frames generated by the high-frequency-enhanced sub-frame generator and the high-frequency-suppressed sub-frames generated by the high-frequency-suppressed sub-frame generator;
• a gain controller configured to adjust an output level of sub-frame images corresponding to the high-frequency-enhanced sub-frames and the high-frequency-suppressed sub-frames output from the first output controller;
• and
• a second output controller configured to receive an output from the first output controller and an output from the gain controller to output an output-level-adjusted signal output from the gain controller as a signal corresponding to the interpolated pixels generated by the interlace-to-progressive converter and to output an output-level non-adjusted signal output from the first output controller as an original pixel signal other than the signal corresponding to the interpolated pixels.

An image processing method for performing image processing in an image display apparatus, comprising the steps of:

• performing signal conversion processing for receiving an interlace signal to convert the interlace signal into a progressive signal including information on interpolated pixels generated by interpolation processing;
• dividing an input image frame in a time-division manner to generate a plurality of sub-frames;
• generating high-frequency-enhanced sub-frames by performing filtering processing on the plurality of sub-frames;
• generating high-frequency-suppressed sub-frames by performing filtering processing on the plurality of sub-frames;
• alternately outputting the high-frequency-enhanced sub-frames and the high-frequency-suppressed sub-frames;
• adjusting an output level of sub-frame images corresponding to the high-frequency-enhanced sub-frames and the high-frequency-suppressed sub-frames;
• and
• receiving an output as a result of alternately outputting the high-frequency-enhanced sub-frames and the high-frequency-suppressed sub-frames and an output of the sub-frame images having an adjusted output level to output an output-level-adjusted signal as a signal corresponding to the interpolated pixels and to output an output-level non-adjusted signal as an original pixel signal other than the signal corresponding to the interpolated pixels.

A computer program product, embodied on a non-transitory computer readable medium, allowing an image display apparatus to perform image processing, the image processing comprising the steps of:

• performing signal conversion processing for receiving an interlace signal to convert the interlace signal into a progressive signal including information on interpolated pixels generated by interpolation processing;
• dividing an input image frame in a time-division manner to generate a plurality of sub-frames;
• generating high-frequency-enhanced sub-frames by performing filtering processing on the plurality of sub-frames;
• generating high-frequency-suppressed sub-frames by performing filtering processing on the plurality of sub-frames;
• alternately outputting the high-frequency-enhanced sub-frames and the high-frequency-suppressed sub-frames;
• adjusting an output level of sub-frame images corresponding to the high-frequency-enhanced sub-frames and the high-frequency-suppressed sub-frames;
• and
• receiving an output as a result of alternately outputting the high-frequency-enhanced sub-frames and the high-frequency-suppressed sub-frames and an output of the sub-frame images having an adjusted output level to output an output-level-adjusted signal as a signal corresponding to the interpolated pixels and to output an output-level non-adjusted signal as an original pixel signal other than the signal corresponding to the interpolated pixels.