Upsampling and signal enhancement
First Claim
Patent Images
1. An apparatus for upsampling a first signal comprising a first resolution, the apparatus comprising a processor or electronic circuit configured toapply an upsampling process onto the first signal so as to acquire a second signal comprising a second resolution higher than the first resolution;
- generate, using sparse approximation, an approximated signal approximating the second signal and comprising the second resolution;
extract a high frequency portion from the approximated signalusing a high pass filter orby estimating a low frequency portion of the approximated signal and subtracting the low frequency portion from the approximated signal; and
combine the second signal and the extracted high frequency portion.
1 Assignment
0 Petitions
Accused Products
Abstract
A signal which is to be quality-improved often suffers from the quality degradation in the spatial high frequency region more than compared to the spatial low frequency region. Accordingly a quality improvement is performed efficiently by combining the signal to be quality improved with a high frequency portion extracted from a sparse approximation of the signal to be quality improved.
-
Citations
26 Claims
-
1. An apparatus for upsampling a first signal comprising a first resolution, the apparatus comprising a processor or electronic circuit configured to
apply an upsampling process onto the first signal so as to acquire a second signal comprising a second resolution higher than the first resolution; -
generate, using sparse approximation, an approximated signal approximating the second signal and comprising the second resolution; extract a high frequency portion from the approximated signal using a high pass filter or by estimating a low frequency portion of the approximated signal and subtracting the low frequency portion from the approximated signal; and combine the second signal and the extracted high frequency portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. An apparatus for enhancing an input signal, the apparatus comprising a processor or electronic circuit configured to
generate, using sparse approximation, an approximated signal approximating the input signal; -
extract a high frequency portion from the approximated signal using a high pass filter or estimating a low frequency portion of the approximated signal and subtracting the low frequency portion from the approximated signal; and combine the input signal and the extracted high frequency portion extracted from the approximated signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
-
-
23. A method for upsampling a first signal comprising a first resolution, comprising
applying an upsampling process onto the first signal so as to acquire a second signal comprising a second resolution higher than the first resolution; -
generating, using sparse approximation, an approximated signal approximating the second signal and comprising the second resolution; extracting a high frequency portion from the approximated signal using a high pass filter or by estimating a low frequency portion of the approximated signal and subtracting the low frequency portion from the approximated signal; and combining the second signal and the extracted high frequency portion. - View Dependent Claims (25)
-
-
24. A method for enhancing an input signal, comprising
generating, using sparse approximation, an approximated signal approximating the input signal; -
extracting a high frequency portion from the approximated signal using a high pass filter or by estimating a low frequency portion of the approximated signal and subtracting the low frequency portion from the approximated signal; and combining the input signal and the extracted high frequency portion extracted from the approximated signal. - View Dependent Claims (26)
-
Specification