Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
213 words
A noise reduction apparatus for reducing noise in an input video signal, the input signal containing pixel data, the apparatus comprising: first delay means for delaying an input video signal to derive a first delayed video signal; first substraction means for subtracting said first delayed video signal from said input video signal and for outputting a finite difference signal; second delay means for delaying said finite difference signal output from said first subtraction means by one horizontal scanning period; transforming means for forming a signal block from the finite difference signal which includes a first predetermined number of pixel data, and in said signal block, for transforming said first predetermined number of pixel data into a second predetermined number of characteristic components based on said finite difference signal and said finite difference signal delayed by said second delay means, and for shifting said signal block one pixel data in a predetermined direction after every transforming operation; nonlinear calculation means for applying a nonlinear calculation to the characteristic components; inverse-transformation means for deriving one compensation output corresponding to said signal block based on the output signal of said nonlinear calculation means; and a second subtraction means for subtracting said compensation output to said input video signal to reduce noise in said input video signal.
Claim 2
Dependent Claim
213 words
A noise reduction apparatus for reducing noise in an input video signal, the input signal containing pixel data, the apparatus comprising: first delay means for delaying an input video signal to derive a first delayed video signal; first substraction means for subtracting said first delayed video signal from said input video signal and for outputting a finite difference signal; second delay means for delaying said finite difference signal output from said first subtraction means by one horizontal scanning period; transforming means for forming a signal block from the finite difference signal which includes a first predetermined number of pixel data, and in said signal block, for transforming said first predetermined number of pixel data into a second predetermined number of characteristic components based on said finite difference signal and said finite difference signal delayed by said second delay means, and for shifting said signal block one pixel data in a predetermined direction after every transforming operation; nonlinear calculation means for applying a nonlinear calculation to the characteristic components; inverse-transformation means for deriving one compensation output corresponding to said signal block based on the output signal of said nonlinear calculation means; and a second subtraction means for subtracting said compensation output to said input video signal to reduce noise in said input video signal.
Claim 3
Dependent Claim
51 words
A noise reduction apparatus in accordance with claim 1, wherein said first predetermined number of pixels in said signal block are arranged in a matrix of M rows and N columns; and said inverse-transformation means derives said compensation output based on pixel data in the (N-1)th column of said pixel block.
Claim 4
Dependent Claim
26 words
A noise reduction apparatus in accordance with claim 1, wherein said first delay means has a delay time equal to a scanning time of one frame.
Claim 5
Dependent Claim
26 words
A noise reduction apparatus in accordance with claim 1, wherein said first delay means has a delay time equal to a scanning time of one field.
Claim 6
Dependent Claim
30 words
A noise reduction apparatus in accordance with claim 1, wherein said first delay means has a delay time equal to a scanning time of a third predetermined number of lines.
Claim 7
Dependent Claim
27 words
A noise reduction apparatus in accordance with claim 1, wherein said transformation means comprises a signal block forming means having a third predetermined number of shift registers.
Claim 8
Dependent Claim
51 words
A noise reduction apparatus in accordance with claim 1, wherein said transformation means comprises: a signal block forming means having a third predetermined number of shift registers; and a fourth predetermined number of delay means, said delay means having a delay time corresponding to a scanning time of one scanning line.