A cost-effective line-based light-balancing technique using adaptive processing.
The camera imaging system has been widely used; however, the displaying image appears to have an unequal light distribution. This paper presents novel light-balancing techniques to compensate uneven illumination based on adaptive signal processing. For text image processing, first, we estimate the background level and then process each pixel with nonuniform gain. This algorithm can balance the light distribution while keeping a high contrast in the image. For graph image processing, the adaptive section control using piecewise nonlinear gain is proposed to equalize the histogram. Simulations show that the performance of light balance is better than the other methods. Moreover, we employ line-based processing to efficiently reduce the memory requirement and the computational cost to make it applicable in real-time systems.
Hsia
Shih-Chang
SC
Department of Computer and Communication Engineering, National Kaohsiung First University of Science and Technology, Kaohsiung 824, Taiwan, ROC. hsia@ccms.nkfust.edu.tw
Chen
Ming-Huei
MH
Chen
Yu-Min
YM
D000465:Algorithms; D003362:Cost-Benefit Analysis; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D016247:Information Storage and Retrieval / Q000379:methods; D008029:Lighting / Q000191:economics / Q000379:methods*; D010781:Photography / Q000191:economics / Q000379:methods*; D010783:Photometry / Q000191:economics / Q000379:methods*