Image interpolation method using Bayer pattern conversion, apparatus for the same, and recording medium recording the method

An image sensor comprising:

• a pixel array comprising a plurality of pixels;
• a Bayer converter configured to convert a signal, which has been output from the pixel array and subjected to correlated double sampling, into a Bayer pattern and output a Bayer pattern signal;
• and
• an image signal processor configured to receive the Bayer pattern signal after the Bayer pattern signal is buffered, interpolate the Bayer pattern signal by performing, for a target pixel from among the plurality of pixels, a summation operation based on a plurality of signals from among signals of pixels neighboring the target pixel, and generate an image of a subject,
• wherein the image signal processor is configured such that the interpolating the Bayer pattern signal includes using
• Da
• 0
• ,
• 0
• =
• ∑
• i
• =
• {
• -
• M
• ,
• …
• ,
• -
• 2
• ,
• -
• 1
• ,
• 0
• ,
• 1
• ,
• 2
• ,
• …
• ,
• M
• }
• j
• =
• {
• -
• N
• ,
• …
• ,
• -
• 2
• ,
• -
• 1
• ,
• 0
• ,
• 1
• ,
• 2
• ,
• …
• ,
• N
• }
• ⁢
• ⁢
• α
• i
• ,
• j
• ⁢
• X
• i
• ,
• j
• +
• β
• 0
• ·
• Dcorr
• ,
• where Da0,0 represents a signal value of the converted output pixel signal, Xi,j represents output signal values of the neighboring of the converted pixel, αi,j and β0 are variable parameters, and
• Dcorr
• =
• ∑
• i
• =
• {
• -
• M
• ,
• …
• ,
• -
• 2
• ,
• -
• 1
• ,
• 0
• ,
• 1
• ,
• 2
• ,
• …
• ,
• M
• }
• j
• =
• {
• -
• N
• ,
• …
• ,
• -
• 2
• ,
• -
• 1
• ,
• 0
• ,
• 1
• ,
• 2
• ,
• …
• ,
• N
• }
• ⁢
• ⁢
• w
• n
• ⁢
• D
• i
• ,
• j
• where wn is a weight determined based on a variation of the target pixel signal, and Di,j represents output signal values of one type of the neighboring pixels.

An image sensor comprising:

• a photoelectric converter configured to generate an image signal corresponding to a subject based on incident light;
• and
• an image signal processor configured to convert the image signal output from the photoelectric converter into a Bayer pattern signal, interpolate an output signal based on the Bayer pattern signal by performing, for a target pixel from among a plurality of pixels, a summation operation based on a plurality of signals from among signals of pixels neighboring the target pixel, and generate an image of the subject,
• wherein the image signal processor is configured to interpolate the output signal by using
• Da
• 0
• ,
• 0
• =
• ∑
• i
• =
• {
• -
• M
• ,
• …
• ,
• -
• 2
• ,
• -
• 1
• ,
• 0
• ,
• 1
• ,
• 2
• ,
• …
• ,
• M
• }
• j
• =
• {
• -
• N
• ,
• …
• ,
• -
• 2
• ,
• -
• 1
• ,
• 0
• ,
• 1
• ,
• 2
• ,
• …
• ,
• N
• }
• ⁢
• ⁢
• α
• i
• ,
• j
• ⁢
• X
• i
• ,
• j
• +
• β
• 0
• ·
• Dcorr
• ,
• where Da0.0 represents an output signal value of a converted pixel, Xi,j represents output signal values of the neighboring pixels of the converted pixel, αi,j and β0 are variable parameters and
• Dcorr
• =
• ∑
• i
• =
• {
• -
• M
• ,
• …
• ,
• -
• 2
• ,
• -
• 1
• ,
• 0
• ,
• 1
• ,
• 2
• ,
• …
• ,
• M
• }
• j
• =
• {
• -
• N
• ,
• …
• ,
• -
• 2
• ,
• -
• 1
• ,
• 0
• ,
• 1
• ,
• 2
• ,
• …
• ,
• N
• }
• ⁢
• ⁢
• w
• n
• ⁢
• D
• i
• ,
• j
• where wn is a weight estimated using a variation of the target pixel signal and Di,j represents output signal values of one type of the neighboring pixels.