发明名称 |
Lens shading correction system |
摘要 |
A lens shading correction (LSC) system includes an illuminant estimator configured to calculate at least one spectral association-measurement of a current frame according to pixel data of an LSC circuit, and then to correlate the at least one calculated spectral association-measurement with spectral association-measurements of a plurality of pre-defined illuminants to determine at least one correlated illuminant. An LSC parameter generator retrieves at least one set of pre-calibrated LSC parameters from a pre-calibrated LSC parameter memory. The LSC parameter generator generates a set of LSC parameters based on the at least one retrieved set of pre-calibrated LSC parameters according to the at least one correlated illuminant. |
申请公布号 |
US9083900(B2) |
申请公布日期 |
2015.07.14 |
申请号 |
US201314072737 |
申请日期 |
2013.11.05 |
申请人 |
Himax Imaging Limited |
发明人 |
Chen Po-Chang |
分类号 |
H04N5/357;H04N5/217;H04N9/04 |
主分类号 |
H04N5/357 |
代理机构 |
Stout, Uxa & Buyan, LLP |
代理人 |
Stout Donald E.;Stout, Uxa & Buyan, LLP |
主权项 |
1. A lens shading correction (LSC) system, comprising:
an LSC circuit configured to receive input pixel data of a current frame; an illuminant estimator configured to calculate at least one spectral association-measurement of the current frame according to the input pixel data or output pixel data of the LSC circuit, and then to correlate the at least one calculated spectral association-measurement with spectral association-measurements of a plurality of pre-defined illuminants to determine at least one correlated illuminant; an LSC parameter generator coupled to receive the at least one correlated illuminant; and a pre-calibrated LSC parameter memory, from which the LSC parameter generator retrieves at least one set of pre-calibrated LSC parameters; wherein the LSC parameter generator generates a set of LSC parameters based on the at least one retrieved set of pre-calibrated LSC parameters according to the at least one correlated illuminant, the generated set of LSC parameters being then forwarded to the LSC circuit to correct pixel data of a succeeding frame; wherein the illuminant estimator comprises: a spectral association-measurement calculator coupled to receive the input or output pixel data in order to calculate the at least one spectral association-measurement; and an edge detector disposed in front of the spectral association-measurement calculator and configured to extract on-edge pixel data from the input or output pixel data, the on-edge pixel data being then forwarded to the spectral association-measurement calculator. |
地址 |
Tainan TW |