X-Git-Url: http://git.kpe.io/?a=blobdiff_plain;f=dof.lisp;h=9cb2486cf719de2373bf9ac45723825423c8c4b0;hb=01efbdaa2981abb7f7a399f5a7f7ff3c431432d5;hp=877002763b18164e5ee25298dfd002b098279301;hpb=aa668443cbb520ebd5dd1d007c19aab2316562e5;p=cl-photo.git diff --git a/dof.lisp b/dof.lisp index 8770027..9cb2486 100755 --- a/dof.lisp +++ b/dof.lisp @@ -9,14 +9,16 @@ ;;;; ;;;; $Id$ ;;;; -;;;; This file, part of cl-photo, is Copyright (c) 2005 by Kevin Rosenberg. -;;;; Rights of modification and redistribution are in the LICENSE file. +;;;; This file, part of cl-photo, is Copyright (c) 2005 by Kevin M. Rosenberg +;;;; +;;;; cl-photo users are granted the rights to distribute and use this software +;;;; as governed by the terms of the GNU General Public License v2 +;;;; (http://www.gnu.org/licenses/gpl.html) ;;;; ;;;; ************************************************************************* (in-package #:photo) -;; Based on http://www.photostuff.co.uk/dofmstr.htm (defun coc-format (format &key (lpm 5) (minimum-distance 250) (viewing-distance 250) @@ -38,8 +40,8 @@ Default resolving power is 5 lpm at 25cm." (let* ((dim (format-dimensions format)) (pixel-width (/ (car dim) nx)) (pixel-height (/ (cdr dim) ny))) - (values (coerce (* 2 pixel-width) 'float) - (coerce (* 2 pixel-height) 'float)))) + (values (float (* 2 pixel-width)) + (float (* 2 pixel-height))))) (defun coc-sensor-camera (camera &key (format :aps)) (let ((dim (sensor-dimensions camera :format format))) @@ -51,13 +53,20 @@ Default resolving power is 5 lpm at 25cm." (width (round (sqrt (* aspect-ratio 1000000 megapixels))))) (cons width (round (/ width aspect-ratio))))) -(defun sensor-dimensions (camera &key (format :aps)) - (etypecase camera + +(defun sensor-dimensions (sensor-spec &key (format :aps)) + "Returns the number of pixels for a sensor. +CAMERA-SPEC is either a keyword designating the camera or +the number of megapixels of the sensor. +FORMAT should be defined if the CAMERA-SPEC is the number of megapixels +so the proper aspect ratio is used." + (etypecase sensor-spec (keyword - (ecase camera + (ecase sensor-spec ;; nikon (:d2x (cons 4288 2848)) - (:d2x (cons 2484 1242)) + (:d100 (cons 3037 2024)) + (:d2h (cons 2464 1632)) (:d70 (cons 3008 2000)) ;; canon @@ -68,42 +77,72 @@ Default resolving power is 5 lpm at 25cm." )) (number - (sensor-dimensions-megapixels format camera)))) + (sensor-dimensions-megapixels format sensor-spec)))) -(defun coc-airy-disk (f-stop) +(defun coc-airy (f-stop) "Return the circle of confusion based on the airy disk." (let ((airy (/ f-stop 1500))) - (coerce (* 2 airy) 'float))) + (float (* 2 airy)))) -(defun dof (focal-length f-stop distance coc) - "Returns depth of field as fives values: -near dof, far dof, total dof, near point, far point. +(defun dof-mm (focal-length f-stop distance coc &key (pupil-factor 1)) + "Returns depth of field based on focal-length, f-stop, distance, and coc. +Six values are returned: +near dof, far dof, total dof, near point, far point, magnification, +blur size at infinity (mm). Circle of confusion can either be a number or keyword designating format." - (let* ((aperature (/ focal-length f-stop)) + (let* ((aperture (/ focal-length f-stop)) + (numerator-1 (* (- pupil-factor 1) (- distance focal-length) + coc focal-length)) + (numerator-2 (* pupil-factor aperture focal-length distance)) + (denominator-1 (* pupil-factor coc (- distance focal-length))) + (denominator-2 (* pupil-factor aperture focal-length)) + (near (/ (+ numerator-1 numerator-2) + (+ denominator-1 denominator-2))) + (far (/ (- numerator-1 numerator-2) + (- denominator-1 denominator-2))) + (mag (float (/ focal-length (- distance focal-length)))) + (infinity-blur-diameter (/ (* mag focal-length) f-stop)) + (depth (- far near))) + (values near far depth mag infinity-blur-diameter))) + +;; Simplified calculation for symmetric lens +(defun dof-symmetric-mm (focal-length f-stop distance coc) + "Returns depth of field based on focal-length, f-stop, distance, and coc. +Six values are returned: +near dof, far dof, total dof, near point, far point, magnification, +blur size at infinity (mm). +Circle of confusion can either be a number or keyword designating format. +Pupil factor is the ratio of the exit to enterance pupil diameters." + (let* ((aperture (/ focal-length f-stop)) (numerator (* distance coc (- distance focal-length))) - (factor-1 (* focal-length aperature)) + (factor-1 (* focal-length aperture)) (factor-2 (* coc (- distance focal-length))) - (near (/ numerator (+ factor-1 factor-2))) - (far (/ numerator (- factor-1 factor-2))) - (depth (+ far near))) - (values near far depth (- distance near) (+ distance far)))) - -(defun dof-feet (focal-length f-stop distance coc) - (multiple-value-bind (near-dof far-dof total-dof near-point far-point) - (dof focal-length f-stop (feet->mm distance) coc) - (values (mm->feet near-dof) (mm->feet far-dof) (mm->feet total-dof) - (mm->feet near-point) (mm->feet far-point)))) - -(defun dof-meters (focal-length f-stop distance coc) - (multiple-value-bind (near-dof far-dof total-dof near-point far-point) - (dof focal-length f-stop (* 1000 distance) coc) - (values (* 0.001 near-dof) (* 0.001 far-dof) (* 0.001 total-dof) - (* 0.001 near-point) (* 0.001 far-point)))) - -(defun hyperfocal (focal-length f-stop coc) - (+ focal-length (/ (* focal-length focal-length) (* f-stop coc)))) - -(defun hyperfocal-feet (focal-length f-stop coc) - (mm->feet (hyperfocal focal-length f-stop coc))) - - + (near (- distance (/ numerator (+ factor-1 factor-2)))) + (far (+ distance (/ numerator (- factor-1 factor-2)))) + (mag (magnification focal-length distance)) + (infinity-blur-diameter (/ (* mag focal-length) f-stop)) + (depth (- far near))) + (values near far depth mag infinity-blur-diameter))) + +(defun dof (focal-length f-stop distance coc &key (units :mm) (pupil-factor 1)) + (multiple-value-bind (near-point far-point total-dof mag blur) + (dof-mm focal-length f-stop (length->mm distance units) coc + :pupil-factor pupil-factor) + (values (mm->length near-point units) + (mm->length far-point units) + (mm->length total-dof units) + mag blur))) + +(defun hyperfocal (focal-length f-stop coc &key (units :mm)) + (mm->length + (+ focal-length (/ (* focal-length focal-length) f-stop coc)) + units)) + +(defun magnification (focal-length distance) + (float (/ focal-length (- distance focal-length)))) + +(defun bellows-factor (focal-length distance) + (1+ (magnification focal-length distance))) + +(defun effective-aperture (focal-length distance aperture) + (* aperture (bellows-factor focal-length distance))) \ No newline at end of file