Abstract: An image display device displays an input video signal on a display panel. The image display device includes: a computation unit which computes the reciprocal of a luminance signal and/or a chrominance signal, acquired when a white signal in the order of 100% is input to display a white screen on the display panel and an image of the white screen is captured by an imaging device; a memory unit which stores the reciprocal computed by the computation unit as correction data; and a correction unit which corrects luminance irregularity and/or color irregularity on the display panel by multiplication of the input video signal and the correction data stored in the memory unit.

Abstract: A liquid crystal backlight apparatus being placed behind a liquid crystal display panel in a manner facing the liquid crystal display panel and illuminating the liquid crystal display panel from behind with a backlight having plural light emitting diodes as a light source, the liquid crystal backlight apparatus including a control part configured to use 0.1-0.

Abstract: Land circle calculating means (7) calculates a land circle as an approximate circle from label information (S6). Land circle accuracy-enhancing means (8) calculates again the land circle by changing a mask angle if land circle candidate information (S7) obtained is improper, so as to enhance the accuracy of the land circle. AND operation means (11) carries out an AND operation of a land circle image (S9) and a binary image (S10) to create a land missing image (S11). In-land binary means (12) calculates an in-land defect image (S12) from an original image (S4). OR operation means (13) carries out an OR operation of the in-land missing image (S11) and the in-land defect image (S12) to create a land defect image (S13).

Abstract: Land circle calculating means (7) calculates a land circle as an approximate circle from label information (S6). Land circle accuracy-enhancing means (8) calculates again the land circle by changing a mask angle if land circle candidate information (S7) obtained is improper, so as to enhance the accuracy of the land circle. AND operation means (11) carries out an AND operation of a land circle image (S9) and a binary image (S10) to create a land missing image (S11). In-land binary means (12) calculates an in-land defect image (S12) from an original image (S4). OR operation means (13) carries out an OR operation of the in-land missing image (S11) and the in-land defect image (S12) to create a land defect image (S13).

Abstract: A color video signal recording system comprises means for producing a quadrature two-phase balanced-modulated color signal by subjecting a subcarrier to quadrature two-phase balanced modulation by two color signals, means for producing a demodulation-purpose reference phase signal which has the same frequency as that of the subcarrier and which is to be frequency-interleaved with the quadrature two-phase balanced-modulated color signal, means for multiplexing the quadrature two-phase balanced-modulated color signal and the demodulation-purpose reference phase signal together with a luminance signal, and means for recording the multiplex signal on a recording medium after subjecting it to angle modulation.

Abstract: A color video signal recording system in which a quadrature two-phase balance-modulated color signal is produced by subjecting a subcarrier to quadrature two-phase balanced modulation by two color signals; and a demodulation-purpose reference phase signal is produced which has the same frequency as that of the subcarrier and which is to be frequency-interleaved with the quadrature two-phase balance-modulated color signal. The quadrature two-phase balance-modulated color signal and the demodulation-purpose reference phase signal together with a carrier luminance signal are multi-plexed and the multiplex signal recorded.

Abstract: A recording method for magnetic recording and further high-density recording of video and audio signals by multiplexing them by frequency division, which is made free of crosstalk among audio signals by varying frequencies of carriers between adjacent tracks which are to be modulated with audio signals. Furthermore in the case of field skip recording, the audio signals of the fields to be skipped are recorded separately, then read out during the next recording field, multiplexed in frequency division together with the audio signals of the recorded field and recorded in a magnetic disk to record continuous audio signals.

Abstract: In an orthogonal phase modulation method the first and second carriers perpendicular to each other are PM modulated by one of the two color signals or of the two luminance signals, at least one of the four signals consisting of two PM signals, the first and the second carriers are inverted or phase-shifted per 1 horizontal scanning period in such a way that these two PM signals will become phase-shifted by 180 degrees relative to each other per one horizontal scanning period by the time these two PM signals reach their inputs, and these PM signals phase-shifted by 180 degrees relative to each other are multiplexed for inputs in said input means. In a demodulation method, PM signals multiplexed by the PM modulation method are delayed by 1 horizontal scanning period and separated into two PM signals by addition and subtraction before and after the delay, and then the thus separated respective PM signals are PM demodulated by phase-shifting the phase reference signals similarly as in the modulation method.