Automatic exposure control method and automatic exposure compensation apparatus
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United States of America Patent
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May 19, 2009
Grant Date -
May 24, 2007
app pub date -
Jun 14, 2006
filing date -
Nov 24, 2005
priority date (Note) -
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Abstract
An automatic exposure control method and compensation apparatus are disclosed. It includes a coordinate system having sub-ranges with different corresponding exposure compensation values. It includes the setting of bright and dark regions threshold values and the calculation of the ratios of the pixel count in an image where the luminance of each pixel is higher than the bright area threshold value for obtaining a bright area ratio, and also includes the calculation of the ratio of the pixel count in an image where the luminance of each pixel is lower than the dark area threshold value for obtaining a dark area ratio. Afterwards, the image position in the coordinate system is determined. When the image position in the coordinate system is fallen inside one of the sub-ranges, the corresponding exposure compensation value of the sub-range where the image is located is given to compensate the exposure value of the image.
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