Techniques for determining settings for a content capture device
摘要
說(shuō)明書(shū)
The process 1800 may further include calculating a total luma value for the image (1818). In some examples, the total luma value may include a summation of the weighted pixel group luma values. In some examples, calculating the image luma value may include summing each of the weighted pixel group luma values, where a weighted pixel group luma value may be computed by multiplying a weight associated with a pixel group with a luma value associated with the pixel group.
The process 1800 may further include computing a difference between the total luma value and the target luma value (1820), and updating a setting of the content capture device based upon the computed difference (1822). In some examples, the setting may be an exposure setting or a gain setting. In such examples, the exposure setting may be a shutter speed, an ISO speed, or any combination thereof. In some examples, the shutter speed may be a global shutter or a rolling shutter. The global shutter may indicate a duration of time to expose all pixels of a field of view. The rolling shutter may indicate a duration of time to expose a row (either horizontally or vertically) of a field of view. In the rolling shutter, lines of an image may be scanned in a rolling manner rather than a snapshot of the field of view. The gain setting may be digital gain, analog gain, or any combination thereof. For example, a gain setting may be 8× by having an analog gain of 2× and a digital gain of 4×. In some examples, the exposure setting may be adjusted before the gain setting when increasing exposure. In such examples, the gain setting may be adjusted before the exposure setting when decreasing exposure. In some examples, the amount of adjustment may be proportional to the difference. For example, the adjustment may be larger if the difference between the image luma value and the target luma value is larger.
