(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)
(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)))
(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
))
(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
projects / cl-photo.git / blobdiff