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US 5,966,170 AGranted
Color video camera for generating a Luminance signal with unattenuated harmonics
AssigneeMitsubishi Denki Kabushiki
InventorsHiroaki Sugiura, Katsumi Asakawa
Life of this patent
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Abstract
The outputs of N kinds of spectral response characteristics from an image sensor are passed through low-pass filters to obtain N kinds of outputs from the 1st through Nth, and the output signal of a pixel of interest having the Kth (1.ltoreq.K.ltoreq.N) spectral response characteristic is multiplied by the ratio of the low-pass filter output of the image sensor output at the coordinates of the pixel of interest to the Kth low-pass filter output at the coordinates of the pixel of interest, thereby the luminance signal with alleviated attenuation of the harmonics components is obtained.
Claims22
A color video camera to obtain color images, comprising:
- a spectral optical system which decomposes an incident ray into N, where N is an integer, kinds of light;
- N pieces of image sensors composed of photoelectric transducers arranged on a two-dimensional plane being optically staggered to each other;
- low-pass filters wherein N kinds of signals generated by adjusting a gain of the outputs of the image sensors are supplied as an input to obtain N kinds of outputs from the 1st through Nth;
- and
- means for calculating a luminance signal component wherein a output signal of a Kth (1.ltoreq.K.ltoreq.N) pixel of interest is multiplied by a ratio of the low-pass filter output of a synthesized signal of pixels of the respective kinds at the coordinates of the Kth pixel of interest to the Kth low-pass filter output at coordinates of the Kth pixel of interest, thereby to obtain the luminance signal component and to improve resolution without attenuating harmonics of the luminance signal component.
2 more elements
A color video camera to obtain color images, comprising:
- a spectral optical system which decomposes an incident ray into N, where N is an integer, kinds of light;
- N pieces of images sensors composed of photoelectric transducers arranged on a two-dimensional plane being optically staggered to each other;
- low-pass filters where N kinds of signals generated by adjusting a gain of outputs of the image sensors are supplied as an input, to obtain N kinds of outputs from the 1st through Nth;
- and
- means for calculating a luminance signal component wherein an output signal of a Kth (1.ltoreq.K.ltoreq.N) pixel of interest plus a constant value is multiplied by a ratio of the low-pass filter output of a synthesized signal of pixels of the respective kinds at the coordinates of the Kth pixel of interest plus the constant value to a Kth low-pass filter output at coordinates of the Kth pixel of interest plus the constant value, and the constant value is subtracted from the result of the multiplication and division, thereby to obtain the luminance signal component with improved resolution and unattenuated harmonics.
2 more elements
A color video camera to obtain color images, comprising:
- a spectral optical system which decomposes an incident ray into N, where N is an integer, kinds of light;
- N pieces of image sensors composed of photoelectric transducers arranged on a two-dimensional plane being optically staggered to each other;
- low-pass filters wherein N kinds of signals generated by adjusting a gain of outputs of the image sensors are supplied as an input to obtain N kinds of outputs from the 1st through Nth;
- and
- first calculating means for calculating the luminance signal component wherein, in a portion of an image having a high spatial frequency, an output signal of a Kth (1.ltoreq.K.ltoreq.N) pixel of interest is multiplied by a ratio of a low-pass filter output of a synthesized signal of pixels of the respective kinds at the coordinates of the Kth pixel of interest to a Kth low-pass filter output at coordinates of the Kth pixel of interest, thereby to obtain the luminance signal component;
- and
- second calculating means for calculating the luminance signal component from a weighted averaging value of outputs of N kinds of pixels in a vicinity of the Kth pixel of interest, in a portion of the image having a low spatial frequency to improve resolution of the luminance signal component without attenuating harmonics.
4 more elements
A color video camera to obtain color images, comprising:
- a spectral optical system which decomposes an incident ray into N, where N is an integer, kinds of light;
- N pieces of image sensors composed of photoelectric transducers arranged on a two-dimensional plane being optically staggered to each other;
- low-pass filters wherein N kinds of signals generated by adjusting a gain of outputs of the image sensors are supplied as an input, to obtain N kinds of outputs from the 1st through Nth;
- and
- means for calculating a luminance signal component wherein an output signal of a Kth (1.ltoreq.K.ltoreq.N) pixel of interest plus a constant value is multiplied by a ratio of a low-pass filter output of a synthesized signal of pixels of the respective kinds at coordinates of the Kth pixel of interest plus the constant value to a Kth low-pass filter output at coordinates of the Kth pixel of interest plus the constant value, thereby to obtain the luminance signal component with improved resolution and unattenuated harmonics.
2 more elements
A color video camera to obtain color images, comprising:
- a spectral optical system which decomposes an incident ray into N, where N is an integer, kinds of light;
- N pieces of image sensors composed of photoelectric transducers arranged on a two-dimensional plane being optically staggered to each other;
- two-dimensional low-pass filters wherein N kinds of signals generated by adjusting a gain of outputs of the image sensors are supplied as inputs to obtain N kinds of outputs from the 1st through Nth;
- and
- means for calculating a luminance signal component wherein an output signal of a Kth (1.ltoreq.K.ltoreq.N) pixel of interest is multiplied by a ratio of the two-dimensional low-pass filter output of a synthesized signal of pixels of the respective kinds at coordinates of the Kth pixel of interest to the Kth two-dimensional low-pass filter output at the coordinates of the Kth pixel of interest, thereby to obtain the luminance signal component and to improve resolution without attenuating harmonics of the luminance signal component.
2 more elements
A color video camera to obtain color images, comprising:
- a spectral optical system which decomposes an incident ray into N, wherein N is an integer, kinds of light;
- N pieces of image sensors composed of photoelectric transducers arranged on a two-dimensional plane being optically staggered to each other;
- two-dimensional low-pass filters wherein N kinds of signals generated by adjusting a gain of outputs of the image sensors are supplied as an input, to obtain N kinds of outputs from the 1st through Nth;
- and
- means for calculating a luminance signal component wherein an output signal of a Kth (1.ltoreq.K.ltoreq.N) pixel of interest plus a constant value is multiplied by a ratio of a two-dimensional low-pass filter output of a synthesized signal of pixels of the respective kinds at coordinates of the Kth pixel of interest plus the constant value, and the constant value is subtracted from a result of a multiplication and division, thereby to obtain the luminance signal component with improved resolution and unattenuated harmonics.
2 more elements
A color video camera to obtain color images, comprising:
- a spectral optical system which decomposes an incident ray into N, where N is an integer, kinds of light;
- N pieces of image sensors composed of photoelectric transducers arranged on a two-dimensional plane being optically staggered to each other;
- two-dimensional low-pass filters wherein N kinds of signals generated by adjusting a gain of outputs of the image sensors are supplied as an input to obtain N kinds of outputs from the 1st through Nth;
- and
- first calculating means for calculating a luminance signal component wherein, in a portion of an image having a high spatial frequency, an output signal of a Kth (1.ltoreq.K.ltoreq.N) pixel of interest is multiplied by a ratio of a two-dimensional low-pass filter output of a synthesized signal of pixels of the respective kinds at coordinates of the Kth pixel of interest to a Kth two-dimensional low-pass filter output at coordinates of the Kth pixel of interest thereby to obtain the luminance signal component;
- and
- second calculating means for calculating the luminance signal component from a weighted averaging value of outputs of N kinds of pixels in a vicinity of the Kth pixel of interest, in a portion of the image having a low spatial frequency to improve resolution of the luminance signal component without attenuating harmonics.
4 more elements
A color video camera to obtain color images, comprising:
- a spectral optical system which decomposes an incident ray into N, where N is an integer, kinds of light;
- N pieces of image sensors composed of photoelectric transducers arranged on a two-dimensional plane being optically staggered to each other;
- two-dimensional low-pass filters wherein N kinds of signals generated by adjusting a gain of outputs of the image sensors are supplied as an input, to obtain N kinds of outputs from the 1st through Nth;
- and
- means for calculating a luminance signal component wherein an output signal of a Kth (1.ltoreq.K.ltoreq.N) pixel of interest plus a constant value is multiplied by a ratio of a two-dimensional low-pass filter output of a synthesized signal of pixels of the respective kinds at coordinates of the Kth pixel of interest plus the constant value to a Kth two-dimensional low-pass filter output at coordinates of the Kth pixel of interest plus the constant value, thereby to obtain the luminance signal component with improved resolution and unattenuated harmonics.
2 more elements
Dependencies are inferred from the claim text.