Signal processing apparatus which suppresses a color signal according to luminance level
First Claim
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1. A signal processing apparatus which processes a signal outputted from an image pickup element having filters arranged to use plural kinds of colors, comprising:
- interpolation circuit which generates a plurality of color signals for each pixel position of the image pickup element by interpolation based on signals of pixels adjacent to said each pixel position of the image pickup element;
color-difference signal forming circuit for forming color-difference signals based on output of said interpolation circuit;
suppression circuit being provided between said color interpolation circuit and said color-difference signal forming circuit, which suppresses the plurality of color signals generated by said interpolation circuit, if a level of a luminance signal is out of a predetermined range;
wherein it is so constructed that plurality of color signals suppressed which are output from said suppression circuit is regarded as input of said color-difference signal forming circuit.
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Abstract
To provide a signal processing apparatus and an image pickup signal processing method both of which restrain a color signal from being influenced by band limitation in a color processing system, thereby enabling signal processing which produces an undegraded image, the processing of color-suppressing RGB signals or complementary color signals is performed between a color interpolation circuit and a color-difference matrix circuit. Otherwise, the processing of suppressing a color signal is performed in front of the color interpolation circuit.
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Citations
34 Claims
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1. A signal processing apparatus which processes a signal outputted from an image pickup element having filters arranged to use plural kinds of colors, comprising:
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interpolation circuit which generates a plurality of color signals for each pixel position of the image pickup element by interpolation based on signals of pixels adjacent to said each pixel position of the image pickup element; color-difference signal forming circuit for forming color-difference signals based on output of said interpolation circuit; suppression circuit being provided between said color interpolation circuit and said color-difference signal forming circuit, which suppresses the plurality of color signals generated by said interpolation circuit, if a level of a luminance signal is out of a predetermined range; wherein it is so constructed that plurality of color signals suppressed which are output from said suppression circuit is regarded as input of said color-difference signal forming circuit. - View Dependent Claims (2, 3, 4)
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5. A signal processing apparatus which processes a signal outputted from an image pickup element having complementary color filters, comprising:
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interpolation circuit which generates complementary color signals for each pixel position of the image pickup element by interpolation based on signals of pixels adjacent to said each pixel position of the image pickup element; RGB matrix circuit which generates RGB signals from the complementary color signals interpolated by said interpolation circuit; color-difference signal forming circuit for forming color-difference signals based on the output by said RGB matrix circuit; and suppression circuit being provided between said interpolation circuit and said color-difference signal forming circuit, which suppresses the RGB signals generated by said RGB matrix circuit, if a level of a luminance signal is out of a predetermined range; wherein it is so constructed that RGB signals outputted from said suppression circuit are input into said color-difference signal forming circuit. - View Dependent Claims (6, 7, 8)
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9. A signal processing apparatus which processes a signal outputted from an image pickup element having complementary color filters, comprising:
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interpolation circuit which generates complementary color signals for each pixel position of the image pickup element by interpolation based on signals of pixels adjacent to each said pixel position of the image pickup element; RGB matrix circuit which generates RGB signals from the complementary color signals; and suppression circuit being provided between said interpolation circuit and said RGB matrix circuit, which suppresses the complementary color signals interpolated by said interpolation circuit, if a level of luminance signal is out of a predetermined range; wherein it is so constructed that the color signals outputted from said suppression circuit are inputted into RGB matrix circuit. - View Dependent Claims (10, 11)
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12. A signal processing apparatus which processes a signal outputted from an image pickup element having filters arranged to use plural kinds of colors, comprising:
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interpolation circuit which generates primary color signals or complementary color signals for each pixel position of the image pickup element by interpolation based on signals of pixels which adjacent to said each pixel position of the image pickup element; and suppression circuit provided between said image pickup element and said interpolation circuit, which suppresses a color signal outputted from the image pickup circuit, if a level of a luminance signal is out of a predetermined range. - View Dependent Claims (13, 14)
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15. A signal processing apparatus which processes a signal outputted from an image pickup element having filters arranged to use plural kinds of colors, comprising:
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a color-suppression circuit, provided for primary color signals or complementary color signals obtained from said image pickup element, for color-suppressing said primary color signals or said complementary color signals in accordance with the level of luminance signal; a gamma-correction circuit which gamma-corrects the output signals suppressed by said suppression circuit; and A/D conversion circuit for A/D converting primary color signals or complementary color signals obtained from said image pickup element before said color-suppression circuit. - View Dependent Claims (16)
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17. A signal processing apparatus which processes a signal outputted from an image pickup element having filters arranged to use plural kinds of colors, comprising:
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a color-suppression circuit, provided for primary color signals or complementary color signals obtained from said image pickup element, for color-suppressing said primary color signals or said complementary color signals in accordance with the level of luminance signal; and a color-difference signal forming circuit for converting the output signals color-suppressed by said color-suppression circuit into color-difference signals; and A/D conversion circuit for A/D converting primary color signals or complementary color signals obtained from said image pickup element before said color-suppression circuit.
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18. A signal processing method which processes a signal outputted from an image pickup element having filters arranged to use plural kinds of colors, comprising:
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interpolating a plurality of color signals for each pixel position of the image pickup element by interpolation based on signals of pixels adjacent to said each pixel position of the image pickup element; forming color-difference signals based on output in interpolating step; suppressing the plurality of color signals interpolated between said color interpolating step and said forming step, if a level of a luminance signal is out of a predetermined range; wherein it is so processed that plurality of color signals suppressed which are output from said suppressing step is regarded as input of said forming step. - View Dependent Claims (19, 20, 21, 22)
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23. A signal processing method which processes a signal outputted from an image pickup element having complementary color filters, comprising:
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interpolating complementary color signals for each pixel position of the image pickup element by interpolation based on signals of pixels adjacent to said each pixel position of the image pickup element; generating RGB signals by performing RGB matrix into complementary color signals interpolated in said interpolating step; forming color-difference signals based on the output in said RGB matrix step; and suppressing, between said interpolating step and said forming step, the RGB signals generated in said RGB matrix step, if a level of a luminance signal is out of a predetermined range; wherein it is so processed that RGB signals outputted in said suppressing step are input into said color-difference signal forming step. - View Dependent Claims (24, 25, 26)
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27. A signal processing method which processes a signal outputted from an image pickup element having complementary color filters, comprising:
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interpolating by generating complementary color signals for each pixel position of the image pickup element by interpolation based on signals of pixels adjacent to each said pixel position of the image pickup element; generating RGB signals by performing RGB matrix into the complementary color signals interpolated in said interpolating step; and suppressing the complementary color signals interpolated in interpolating step between said interpolating step and said generating step, if a level of luminance signal is out of a predetermined range; wherein it is so processed that the color signals outputted in said suppressing step are inputted into RGB matrix circuit. - View Dependent Claims (28, 29)
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30. A signal processing method which processes a signal outputted from an image pickup element having filters arranged to use plural kinds of colors, comprising:
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interpolating by generating primary color signals or complementary color signals for each pixel position of the image pickup element by interpolation based on signals of pixels which adjacent to said each pixel position of the image pickup element; and suppressing, between said image pickup element and said interpolating step, a color signal outputted from the image pickup step, if a level of a luminance signal is out of a predetermined range. - View Dependent Claims (31, 32)
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33. A signal processing method which processes a signal outputted from an image pickup element having filters arranged to use plural kinds of colors, comprising:
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a color-suppressing primary color signals or complementary color signals obtained from said image pickup element in accordance with the level of luminance signal; and a gamma-correcting the output signals suppressed in said color-suppression step; and A/D converting primary color signals or complementary color signals obtained from said image pickup element before said the signals are suppressed in said suppressing step.
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34. A signal processing method which processes a signal outputted from an image pickup element having filters arranged to use plural kinds of colors, comprising:
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suppressing, primary color signals or complementary color signals obtained from said image pickup element, in accordance with the level of luminance signal; forming color-difference signal by converting the output signals color-suppressed in said color-suppressing step into color-difference signals; and A/D converting primary color signals or complementary color signals obtained from said image pickup element before said the signals are suppressed in said suppressing step.
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Specification