发明名称 |
Detection and/or enhancement of contrast differences in digital image data |
摘要 |
A method for obtaining and/or enhancing local contrast differences (LD) in digital image input data (in), wherein a local contrast measure (SADap) approximating a two-dimensional sum of absolute difference (SAD) measure is obtained by obtaining a first-dimension sum of absolute difference measure (energyVk(m, n)) representing a sum of absolute difference (SAD) in a first dimension of at least one image region, and obtaining the local contrast measure (SADap) as a second-dimension convoluted first-dimension sum of absolute difference measure by convoluting the first-dimension sum of absolute difference measure (energyVk(m, n)) in a second dimension of the at least one image region, is proposed, wherein the step of obtaining the local contrast measure (SADap) as the second-dimension convoluted first-dimension sum of absolute differences measure further includes an addition step wherein an energy term (Δlpfk(j)) representing a first-order difference on a distance (J) of a low pass filtered signal used in obtaining the first-dimension sum of absolute differences measure (energyVk(m, n)) and in obtaining the second-dimension convoluted first-dimension sum of absolute differences measure is introduced while obtaining the local contrast measure (SADap). |
申请公布号 |
US8873880(B2) |
申请公布日期 |
2014.10.28 |
申请号 |
US201013643690 |
申请日期 |
2010.04.26 |
申请人 |
Robert Bosch GmbH |
发明人 |
Schirris Johan;Cvetkovic Sasa |
分类号 |
G06K9/40;G06T5/00 |
主分类号 |
G06K9/40 |
代理机构 |
Michael Best & Friedrich LLP |
代理人 |
Michael Best & Friedrich LLP |
主权项 |
1. A method for obtaining and/or enhancing local contrast differences (LD) in digital image input data (in), wherein a local contrast measure (SADap) approximating a two-dimensional sum of absolute difference (SAD) measure is obtained by
obtaining a first-dimension sum of absolute difference measure (energyVk(m, n)) representing a sum of absolute difference (SAD) in a first dimension of at least one image region, wherein (m, n) define positions, and obtaining the local contrast measure (SADap) as a second-dimension convoluted first-dimension sum of absolute difference measure by convoluting the first-dimension sum of absolute difference measure (energyVk(m, n)) in a second dimension of the at least one image region, wherein the step of obtaining the local contrast measure (SADap) as the second-dimension convoluted first-dimension sum of absolute differences measure further includes an addition step wherein an energy term (Δlpfk)(j)) representing a first-order difference on a distance (j) of a low pass filtered signal used in obtaining the first-dimension sum of absolute differences measure (energyVk(m, n)) and in obtaining the second-dimension convoluted first-dimension sum of absolute differences measure is introduced while obtaining the local contrast measure (SADap). |
地址 |
Stuttgart DE |