Noise reduction circuit for high definition video signal
AssigneeSamsung Electronics Co., Ltd.
InventorPhil H. Yu
Life of this patent
Estimating the term…
Abstract
In ATV (Advanced Television) system which compresses the band of high-definition video signal by using sub-band coding method, the high frequency components of the high-definition video signal are divided into two-dimensional blocks by a maximum value detector, and the adaptive block coefficients are generated according to the maximum value of each block by an adaptive block factor generator and are multiplied by each pixel signals to amplify the transmitting level. Next, in a receiver circuit, the transmitted pixel signals of the high-definition video signal are again divided by the adaptive pixel coefficients, there by reducing the noise mixed during the channel transmission by a factor of the factor ratio.
Claims27
A noise reduction circuit for high definition video signals, comprising:
- absolute value generating means for successively generating absolute values of high frequency component video signals;
- maximum value detecting means for successively forming two-dimensional blocks of said absolute values and providing maximum values for each of said two-dimensional blocks;
- block adaptive factor generating means receiving said maximum values and providing a channel peak value as block adaptive factors if said maximum values are zero and providing said channel peak value divided by said maximum values as said block adaptive factors if said maximum values are non-zero;
- first pixel adaptive factor generating means for generating first pixel adaptive factors by interpolating said block adaptive factors in a horizontal direction and by averaging said block adaptive factors between lines in a vertical direction;
- multiplier means for generating transmitting signals by multiplying said high frequency component video signals by said first pixel adaptive factors to amplify a level of video pixel signals for transmission through a channel;
- second pixel adaptive factor generating means for generating second pixel adaptive factors by interpolating said block adaptive factors in the horizontal direction and by averaging said block adaptive factors between lines in the vertical direction;
- and
- divider means for reconstructing said high-frequency component video signals by dividing the transmitting signals received from said multiplier means through said channel by said second pixel adaptive factors.
A noise reduction circuit for high definition video signals comprising:
- absolute value generating means for successively generating absolute values of high frequency component video signals;
- maximum value detecting means for successively forming two-dimensional blocks of said absolute values and providing maximum values for each of said two-dimensional blocks;
- block adaptive factor generating means receiving said maximum values and providing a channel peak value as block adaptive factors if said maximum values are zero and providing said channel peak value divided said maximum values as said block adaptive factors if said maximum values are non-zero;
- first pixel adaptive factor generating means for generating first pixel adaptive factors by interpolating said block adaptive factors in a horizontal direction and by averaging said block adaptive factors between lines in a vertical direction;
- and
- multiplier means for multiplying said high frequency component video signals by said pixel adaptive factors to amplify a level of video pixel signals for transmission through a
A noise reduction process, comprising:
- successively generating absolute values of high frequency component video signals;
- successively forming two-dimensional blocks of said absolute values and providing maximum values for each of said two-dimensional blocks;
- providing a channel peak value as block adaptive factors if said maximum values are zero and providing said channel peak value divided said maximum values as said block adaptive factors if said maximum values are non-zero;
- generating first pixel adaptive factors by interpolating said block adaptive factors in a horizontal direction and by averaging said block adaptive factors between lines in a vertical direction;
- delaying high frequency components of pixels for a predetermined time to synchronize said high frequency components with the timing of the first pixel adaptive factors;
- multiplying said high frequency component video signals by said first pixel adaptive factors to amplify a level of video pixel signals for transmission through a channel;
- generating second pixel adaptive factors by interpolating said block adaptive factors in the horizontal direction and by averaging said block adaptive factors between lines in the vertical direction;
- and
- reconstructing said high frequency component video signals by dividing the high frequency component video signals received through said channel by said second pixel adaptive factors.
Dependencies are inferred from the claim text.