Method of adjusting the brightness of a digital camera image

摘要

A method for adjusting the brightness of a captured image from a digital camera includes calculating a reference exposure value using the capture parameters and calculating an actual exposure value as a function of ambient illumination parameters. The reference exposure and actual exposure values are compared to determine an actual image saturation value. The actual image saturation value is compared with the saturation value of the image sensor to determine a brightness adjustment factor, and the captured image is adjusted to compensate for overexposure or underexposure in response to the brightness adjustment factor. The image is scaled up or down using the brightness adjustment factor if the actual image saturation value is less than or more than the saturation value of the image sensor used to capture the image.

主权项

1. A method for adjusting the brightness of a captured image from a digital camera, comprising:
calculating a reference exposure value using the capture parameters; calculating an actual exposure value as a function of the parameters characterizing ambient illumination; comparing the reference exposure value and the actual exposure value to determine an actual image saturation value; comparing the actual image saturation value with the saturation value of the image sensor used to capture the image to determine a brightness adjustment factor; wherein determining the brightness adjustment factor includes providing a headroom adjustment parameter to avoid clipping the image information during processing or when converting the image into an output image range; and adjusting the captured image to compensate for one of overexposure and underexposure in response to the brightness adjustment factor.