Camera signal processing apparatus and camera signal processing method

A camera signal processing method comprising the steps of:

• interpolating pixel data in at least two directions based on a position of said pixel data and/or pixel data around said position, said pixel data being generated based on an imaging signal coming from a solid-state image sensor in which an imaging light enters through a color filter having a different spectral characteristic for each pixel, thereby separately generating interpolated pixel data in said at least two directions;
• detecting a correlation value indicative of a degree of correlation in each of said at least two directions of said interpolated pixel data;
• normalizing said correlation value in each of said at least two directions to generate a normalized value indicative of a relative value of said correlation value in each of said at least two directions;
• adding a predetermined correction value to said normalized value;
• weighting said interpolated pixel data in each of said at least two directions with said normalized value obtained by adding said correction value to said interpolated pixel data in each of said at least two directions and adding together the weighted interpolated pixel data in all of said at least two directions to generate interpolated pixel data;
• and
• generating an image based on said weighted interpolated pixel data.

A camera signal processing apparatus comprising:

• an interpolated pixel data generating means for interpolating pixel data in at least two directions based on a position of said pixel data and/or pixel data around said position, said pixel data being generated based on an imaging signal coming from a solid-state image sensor in which an imaging light enters through a color filter having a different spectral characteristic for each pixel, thereby separately generating interpolated pixel data in said at least two directions;
• a correlation detecting means having a band-pass filter [−1, 0, 2, 0, −1] and a low-pass filter for detecting a correlation value indicative of a degree of correlation in each of said at least two directions of said interpolated pixel data generated by said interpolated pixel data generating means;
• and
• a weighting means for weighting said interpolated pixel data in each of said at least two directions generated by said interpolated pixel data generating means with said correction value detected by said correlation value detecting means in each of said at least two directions and adding the weighted interpolated pixel data in said at least two directions to generate interpolated pixel data.

A camera signal processing method comprising the steps of:

• interpolating pixel data in at least two directions based on a position of said pixel data and/or pixel data around said position, said pixel data being generated based on an imaging signal coming from a solid-state image sensor in which an imaging light enters through a color filter having a different spectral characteristic for each pixel, thereby separately generating interpolated pixel data in said at least two directions;
• detecting a correlation value by use of a correlation detecting means having a band-pass filter [−1, 0, 2, 0, −1] and a low-pass filter indicative of a degree of correlation in each of said at least two directions of said interpolated pixel data;
• and
• weighting said interpolated pixel data in each of said at least two directions with said correction value in each of said at least two directions and adding the weighted interpolated pixel data in said at least two directions to generate interpolated pixel data.

A camera signal processing apparatus comprising:

• an interpolated pixel data generating means for interpolating pixel data to be generated according to a signal coming from a solid-state image sensor in which light enters through a color filter having a different spectral characteristic for each pixel to provide interpolated pixel data based on a position of said pixel data and/or pixel data around said position;
• a correlation detecting means having a band-pass filter [−1, 0, 2, 0, −1] and a low-pass filter for detecting a correlation value for indicating a degree of correlation between a horizontal direction and a vertical direction of said interpolated pixel data generated by said interpolated pixel data generating means to weight said interpolated pixel data;
• and
• an image generating means for generating an image based on said interpolated pixel data obtained by weighting said interpolated pixel data generated by said interpolated pixel data generating means with said correlation value detected by said correlation detecting means;
• wherein said correlation detecting means uses only pixel data indicative of a predetermined color in pixel data detected by said solid-state image sensor to detect a correlation value for interpolated pixel data indicative of said predetermined color and a correlation value for interpolated pixel data indicative of a color other than said predetermined color.

A camera signal processing apparatus comprising:

• an interpolated pixel data generating means for interpolating pixel data to be generated according to a signal coming from a solid-state image sensor in which light enters through a color filter having a different spectral characteristic for each pixel to provide interpolated pixel data based on a position of said pixel data and/or pixel data around said position;
• a correlation detecting means for detecting a correlation value for indicating a degree of correlation between a horizontal direction and a vertical direction of said interpolated pixel data generated by said interpolated pixel data generating means to weight said interpolated pixel data;
• and
• an image generating means for generating an image based on said interpolated pixel data obtained by weighting said interpolated pixel data generated by said interpolated pixel data generating means with said correlation value detected by said correlation detecting means;
• wherein said correlation detecting means uses only pixel data indicative of a predetermined color in pixel data detected by said solid-state image sensor to detect a correlation value for interpolated pixel data indicative of said predetermined color and a correlation value for interpolated pixel data indicative of a color other than said predetermined color, and
• wherein said correlation detecting means uses only pixel data having substantially a same color as that of said interpolated pixel data and uses a band-pass filter [−1, 0, 2, 0, −1] and a low-pass filter [1,0,6,0,1]/8 and to detect said interpolated pixel data indicative of said predetermined color.

A camera signal processing apparatus comprising:

• an interpolated pixel data generating means for interpolating pixel data to be generated according to a signal coming from a solid-state image sensor in which light enters through a color filter having a different spectral characteristic for each pixel to provide interpolated pixel data based on a position of said pixel data and/or pixel data around said position;
• a correlation detecting means for detecting a correlation value for indicating a degree of correlation between a horizontal direction and a vertical direction of said interpolated pixel data generated by said interpolated pixel data generating means to weight said interpolated pixel data;
• and
• an image generating means for generating an image based on said interpolated pixel data obtained by weighting said interpolated pixel data generated by said interpolated pixel data generating means with said correlation value detected by said correlation detecting means;
• wherein said correlation detecting means uses only pixel data indicative of a predetermined color in pixel data detected by said solid-state image sensor to detect a correlation value for interpolated pixel data indicative of said predetermined color and a correlation value for interpolated pixel data indicative of a color other than said predetermined color, and
• wherein said correlation detecting means uses only pixel data of said predetermined color and uses a band-pass filter [−1, 0, 2, 0, −1] and a low-pass filter [1, 0, 1]/2 to detect said correlation value for said interpolated pixel data indicative of a color other than said predetermined color.

A camera signal processing method comprising the steps of:

• interpolating pixel data to be generated according to a signal coming from a solid-state image sensor in which a light enters through a color filter having a different spectral characteristic for each pixel to provide interpolated pixel data based on a position of said pixel data and/or pixel data around said position;
• detecting a correlation value by use of a correlation detecting means having a band-pass filter [−1, 0, 2, 0, −1] and a low-pass filter for interpolated pixel data indicative of a predetermined color and a correlation value for interpolated pixel data indicative of a color other than said predetermined color by using only pixel data indicative of said predetermined color;
• weighting said interpolated pixel data with said correction value;
• and
• generating an image based on the weighted interpolated pixel data.

A camera signal processing method comprising the steps of:

• interpolating pixel data to be generated according to a signal coming from a solid-state image sensor in which a light enters through a color filter having a different spectral characteristic for each pixel to provide interpolated pixel data based on a position of said pixel data and/or pixel data around said position;
• detecting a correlation value for interpolated pixel data indicative of a predetermined color and a correlation value for interpolated pixel data indicative of a color other than said predetermined color by using only pixel data indicative of said predetermined color;
• weighting said interpolated pixel data with said correction value;
• and
• generating an image based on the weighted interpolated pixel data,
• wherein said correlation value for said interpolated pixel data indicative of said predetermined color is detected by use of only pixel data having substantially a same color as that of said interpolated pixel data and by use of a band-pass filter [−1, 0, 2, 0, −1] and a low-pass filter [1, 0, 6, 0, 1]/8.

A camera signal processing method comprising the steps of:

• interpolating pixel data to be generated according to a signal coming from a solid-state image sensor in which a light enters through a color filter having a different spectral characteristic for each pixel to provide interpolated pixel data based on a position of said pixel data and/or pixel data around said position;
• detecting a correlation value for interpolated pixel data indicative of a predetermined color and a correlation value for interpolated pixel data indicative of a color other than said predetermined color by using only pixel data indicative of said predetermined color;
• weighting said interpolated pixel data with said correction value;
• and
• generating an image based on the weighted interpolated pixel data,
• wherein said correlation value for said interpolated pixel data indicative of a color other than said predetermined color is detected by use of only said pixel data indicative of said predetermined color and by use of a band-pass filter [−1, 0, 2, 0, −1] and a low-pass filter [1, 0, 1]/2.