求翻译：四角距离中心90%处取样,要求其亮度值与中心处取样框亮度的比值大于60%（取样框大小为40*40像素， sensor暗角补偿功能未开启）。是什么意思？

90% at the four corners from the center of the sampling, requiring the center of brightness value and the ratio of the sampling frame is greater than 60% of the brightness (sample frame size is 40 * 40 pixels, sensor vignetting compensation function disabled).

Distance from the center point 4 90 % sampling, calling for its brightness value Center with the brightness of the sampling frame/E ratio greater than 60 per cent (sampling frame size is 40 * 40 pixel sensor and hidden corners, unopened) compensation function.

Four angular distance center 90% sample, requests its luminance value and the center sample frame brightness ratio is bigger than 60% (sample frame size is the 40*40 picture element, sensor dark angle compensatory function opening).

Four corners 90% sampling from the Center, its brightness value the ratio of brightness to the Center Sample box is greater than 60% (Sample box size is 40*40 pixels sensor dark angle compensation feature is not turned on).

90% at the four corners from the center of the sampling, requiring the center of brightness value and the ratio of the sampling frame is greater than 60% of the brightness (sample frame size is 40 * 40 pixels, sensor vignetting compensation function disabled).