The problem is covering a rectangular sensor chip with a circle of light from the lens.
问题在于要用镜头上的光圈盖住传感器芯片。
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In the part of vision system design, the hardware platform is composed of linear array light, cylindrical lens and linear array image sensor, then the algorithm of circle fitting method is carried on.
Duplicatecircle shapes from lens and resize it until it fit inside the viewfinder. Create a new layer on top of the circle and draw some subtle highlights.