Magnification is the ratio of the image height to the height of the actual object.

缩放是图像的纵横比 到实际身高。

Now, just like WAV files, BMPs start with metadata, including key values like image width, image height, and color depth.

现在，就像 WAV 文件一样，BMP 以元数据开始，包括图像宽度、图像高度和颜色深度等关键值。

Using your small-angle approximation, you can then replace the angles in the magnification equation with the new expressions in terms of image height and focal lengths.

使用您的小角度近似，您可以将放大方程中的角度替换为图像高度和焦距方面的新表达式。