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Portable Network Graphic  |  1993-02-04  |  3KB  |  512x342  |  1-bit (2 colors)

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OCR: a. Let 0 be the angle made by the line from the camera to the ground point A with respect to the vertical, where 0 > O if Q and R are on the same side of CN and 0 < 0 if they are on opposite sides of CN (0 = ZNCQ). Express the ratio of the length of the image WQ to the length of NA in terms of 0, t, f, and H for the case where 0 > t. Solution: From the geometry, we see that since CR I WQ, ZNCR = ZYCT = t and QW QR + RW f tan (0 - t) + f tan t AN = AN H tan 8 f (tan 0 - tan t) 1 + tan 8 tan t + f tan t ftan 0 - f tan t + f tan t + f tan 0 tan2 t = H tan 8 H tan 0 (1 + tan 0 tan t ) f tan 0 ( 1 + tan2t ) QW f ( 1 + tan2t) H tan 0 ( 1 + tan 0 tan t ) 80 AN H ( 1 + tan 0 tan t )

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