Video signal processing method and device
AssigneeVictor Company of Japan, Ltd.
InventorHiroyuki Miyahara
Life of this patent
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Abstract
In a video signal processing method of processing a luminance signal of a video signal generated by causing a CCD to receive light transmitted through color filters, a control signal yf1 is generated by calculating Cy/Y using a complementary color signal Cy and a luminance signal Y, and coring correction is performed to the luminance signal by using the control signal yf1. The characteristic difference between the color filters is suppressed, and, as a result, flickers are suppressed from being generated.
Claims32
A video signal processing method of processing a luminance signal of a video signal generated by causing a solid state image pickup device to receive light transmitted through color filters, comprising the steps of:
- calculating an output signal from a specific pixel of the solid state image pickup device;
- calculating an average of output signals from all pixels of the solid state image pickup device;
- generating a control signal by a predetermined arithmetic operation using the output signal from the specific pixel and the average of the output signals from all the pixels of the solid state image pickup device;
- and
- performing a predetermined correction process to the luminance signal by using the control signal.
A video signal processing method of processing a luminance signal of a video signal generated by causing a solid state image pickup device to receive light transmitted through color filters, comprising the steps of
- calculating an output signal from a first specific pixel of the solid state image pickup device;
- calculating an output signal from a second specific pixel of the solid state image pickup device;
- generating a control signal by a predetermined arithmetic operation using the output signal from the first specific pixel and the output signal from the second specific pixel of the solid state image pickup device;
- and
- performing a predetermined correction process to the luminance signal by using the control signal.
A video signal processing device for processing a luminance signal of a video signal generated by causing a solid state image pickup device to receive light transmitted through color filters, comprising:
- first signal operation means for calculating an output signal from a specific pixel of the solid state image pickup device;
- second signal operation means for calculating an average of output signals from all pixels of the solid state image pickup device;
- control signal generation means for generating a control signal by a predetermined arithmetic operation using the output signal from the specific pixel and the average of the output signals from all the pixels of the solid state image pickup device;
- and
- correction means for performing a predetermined correction process to the luminance signal by using the control signal.
A video signal processing device for processing a luminance signal of a video signal generated by causing a solid state image pickup device to receive light transmitted through color filters, comprising:
- first signal operation means for calculating an output signal from a first specific pixel of a solid state image pickup device;
- second signal operation means for calculating an output signal from a second specific pixel of the solid state image pickup device;
- control signal generation means for generating a control signal by a predetermined arithmetic operation using the output signal from the first specific pixel and the output signal from the second specific pixel of the solid state image pickup device;
- and
- correction means for performing a predetermined correction process for a luminance signal by using the control signal.
A luminance signal processing circuit for a color video camera, generating a luminance signal from an output signal from a solid state image pickup device having a plurality of lines obtained by repeating a pair of pixels having color filters, the luminance signal processing circuit comprising:
- a circuit in which a light transmittance of one of the pair of pixels and a light transmittance of the other are represented by T1 and T2, respectively, a photo detection signal from one of the pair of pixels is multiplied by (T1+T2)/(2×T1) in advance, a photo detection signal from the other of the pair of pixels is multiplied by (T1+T2)/(2×T2), and the luminance signal is generated by a low-frequency component of a signal obtained by synthesizing these photo detection signals.
A luminance signal processing circuit for a color video camera, generating a luminance signal from an output signal from a solid state image pickup device having a plurality of lines obtained by repeating a pair of pixels having color filters, the luminance signal processing circuit comprising:
- a circuit in which an output signal from one of the pair of pixels and an output signal from the other are represented by T1 and T2, respectively, low-frequency components of the output signals T1 and T2 are represented by T1L and T2L, respectively, and conversions expressed by the following equations:
- T1′=T1×(T1L+T2L)/(2×T2L)T2′=T2×(T1L+T2L)/(2×T1L)
- are performed to the pixels of the respective lines to generate the luminance signal.
A luminance signal processing circuit for a color video camera, generating a luminance signal from an output signal from a solid state image pickup device having a plurality of lines obtained by repeating a pair of pixels having color filters, the luminance signal processing circuit comprising:
- a circuit in which an output signal from one of the pair of pixels and an output signal from the other are represented by T1 and T2, respectively, low-frequency components of the output signals T1 and T2 are represented by T1L and T2L, respectively, and conversions expressed by the following equations:
- T1′=2×T1×T2L/(T1L+T2L)T2′=2×T2×T1L/(T1L+T2L)
- are performed to the pixels of the respective lines to generate the luminance signal.
Dependencies are inferred from the claim text.