Efficient Light Balancing Techniques for Text Images

in Video Presentation SystemsShih-Chang Hsia and Po-Shien Tsai

Efficient Light Balancing Techniques for Text Images

in Video Presentation SystemsShih-Chang Hsia and Po-Shien Tsai

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY, VOL. 15, NO. 8, AUGUST 2005指導老師：萬書言指導老師：萬書言學生：賴薏如學生：賴薏如

original

Using hight gain Using low gain

Processing flow

BMV ： black mean variance

： process pixel

N*N ： block size

： information of light distribution at the (j,k)th pixel

M ： number of interpolated data in the marked line

K ： interpolated location

： Execpted gain value

： Number of previous text-block

： black variance in the Kth text block

： black mean in the Kth text block

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