发明名称 |
GRADATION CORRECTING APPARATUS, MOBILE TERMINAL DEVICE, IMAGE PICKUP APPARATUS, MOBILE TELEPHONE, GRADATION CORRECTING METHOD, AND PROGRAM |
摘要 |
<p>The present invention relates to a technique for correcting tones of a digitized image, for use in a mobile terminal or the like. The use of a conventional image tone correction technique to backlight correction imposes a limit on improvement in local contrast in a bright region or a dark region. According to the present invention, a block timing generation part (102) divides one image area into a plurality of blocks, an average luminance calculation part (103) calculates an average luminance level per block specified at the part 102, a correction-amount-per-block calculation part (104) calculates a direction of correction and a correction amount from an average luminance level per block, a correction-amount-per-pixel calculation part (105) interpolates the correction amount per block into the correction amount per pixel in that block, and a tone conversion part (107) reads out a final correction amount from a tone conversion table part (108), using the correction amount per pixel and luminance data of that pixel read out from a memory (106) as an address, to carry out tone conversion.</p> |
申请公布号 |
EP1746539(A1) |
申请公布日期 |
2007.01.24 |
申请号 |
EP20050727555 |
申请日期 |
2005.03.29 |
申请人 |
MITSUBISHI DENKI KABUSHIKI KAISHA |
发明人 |
ONO, YOSHIKI;SUGIYAMA, KAZUHIRO |
分类号 |
G06T5/00;H04N5/20;G06T5/40;H04N1/407;H04N1/46;H04N1/60;H04N1/62;H04N9/64 |
主分类号 |
G06T5/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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