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;;; 1. Added INEXACT->EXACT wrappers around READ.
;;; 2. Changed FOR-EACH-N to DO.
;;; 3. Eliminated SQR, MATRIX-REF, MATRIX-SET!, MATRIX-ROWS, MATRIX-COLUMNS,
;;; MAKE-MATRIX, WHEN, and UNLESS.
;;; begin Stalin
(define make-pbm (primitive-procedure make-structure pbm 2))
(define pbm? (primitive-procedure structure? pbm))
(define pbm-raw? (primitive-procedure structure-ref pbm 0))
(define pbm-bitmap (primitive-procedure structure-ref pbm 1))
(define make-pgm (primitive-procedure make-structure pgm 3))
(define pgm? (primitive-procedure structure? pgm))
(define pgm-raw? (primitive-procedure structure-ref pgm 0))
(define pgm-maxval (primitive-procedure structure-ref pgm 1))
(define pgm-grey (primitive-procedure structure-ref pgm 2))
(define make-ppm (primitive-procedure make-structure ppm 5))
(define ppm? (primitive-procedure structure? ppm))
(define ppm-raw? (primitive-procedure structure-ref ppm 0))
(define ppm-maxval (primitive-procedure structure-ref ppm 1))
(define ppm-red (primitive-procedure structure-ref ppm 2))
(define ppm-green (primitive-procedure structure-ref ppm 3))
(define ppm-blue (primitive-procedure structure-ref ppm 4))
;;; end Stalin
;;; begin Scheme->C
(define (make-pbm raw? bitmap) (vector 'pbm raw? bitmap))
(define (pbm? pnm) (eq? (vector-ref pnm 0) 'pbm))
(define (pbm-raw? pnm) (vector-ref pnm 1))
(define (pbm-bitmap pnm) (vector-ref pnm 2))
(define (make-pgm raw? maxval grey) (vector 'pgm raw? maxval grey))
(define (pgm? pnm) (eq? (vector-ref pnm 0) 'pgm))
(define (pgm-raw? pnm) (vector-ref pnm 1))
(define (pgm-maxval pnm) (vector-ref pnm 2))
(define (pgm-grey pnm) (vector-ref pnm 3))
(define (make-ppm raw? maxval r g b) (vector 'ppm raw? maxval r g b))
(define (ppm? pnm) (eq? (vector-ref pnm 0) 'ppm))
(define (ppm-raw? pnm) (vector-ref pnm 1))
(define (ppm-maxval pnm) (vector-ref pnm 2))
(define (ppm-red pnm) (vector-ref pnm 3))
(define (ppm-green pnm) (vector-ref pnm 4))
(define (ppm-blue pnm) (vector-ref pnm 5))
(define (panic s) (error 'panic s))
;;; end Scheme->C
;;; begin Gambit-C
(define-structure pbm raw? bitmap)
(define-structure pgm raw? maxval grey)
(define-structure ppm raw? maxval red green blue)
(define (panic s) (error s))
;;; end Gambit-C
;;; begin Bigloo
(define (make-pbm raw? bitmap) (vector 'pbm raw? bitmap))
(define (pbm? pnm) (eq? (vector-ref pnm 0) 'pbm))
(define (pbm-raw? pnm) (vector-ref pnm 1))
(define (pbm-bitmap pnm) (vector-ref pnm 2))
(define (make-pgm raw? maxval grey) (vector 'pgm raw? maxval grey))
(define (pgm? pnm) (eq? (vector-ref pnm 0) 'pgm))
(define (pgm-raw? pnm) (vector-ref pnm 1))
(define (pgm-maxval pnm) (vector-ref pnm 2))
(define (pgm-grey pnm) (vector-ref pnm 3))
(define (make-ppm raw? maxval r g b) (vector 'ppm raw? maxval r g b))
(define (ppm? pnm) (eq? (vector-ref pnm 0) 'ppm))
(define (ppm-raw? pnm) (vector-ref pnm 1))
(define (ppm-maxval pnm) (vector-ref pnm 2))
(define (ppm-red pnm) (vector-ref pnm 3))
(define (ppm-green pnm) (vector-ref pnm 4))
(define (ppm-blue pnm) (vector-ref pnm 5))
(define (panic s) (error s 'panic 'panic))
;;; end Bigloo
;;; begin Chez
(define (make-pbm raw? bitmap) (vector 'pbm raw? bitmap))
(define (pbm? pnm) (eq? (vector-ref pnm 0) 'pbm))
(define (pbm-raw? pnm) (vector-ref pnm 1))
(define (pbm-bitmap pnm) (vector-ref pnm 2))
(define (make-pgm raw? maxval grey) (vector 'pgm raw? maxval grey))
(define (pgm? pnm) (eq? (vector-ref pnm 0) 'pgm))
(define (pgm-raw? pnm) (vector-ref pnm 1))
(define (pgm-maxval pnm) (vector-ref pnm 2))
(define (pgm-grey pnm) (vector-ref pnm 3))
(define (make-ppm raw? maxval r g b) (vector 'ppm raw? maxval r g b))
(define (ppm? pnm) (eq? (vector-ref pnm 0) 'ppm))
(define (ppm-raw? pnm) (vector-ref pnm 1))
(define (ppm-maxval pnm) (vector-ref pnm 2))
(define (ppm-red pnm) (vector-ref pnm 3))
(define (ppm-green pnm) (vector-ref pnm 4))
(define (ppm-blue pnm) (vector-ref pnm 5))
(define (panic s) (error 'panic s))
;;; end Chez
;;; begin Chicken
(define-record-type pbm raw? bitmap)
(define-record-type pgm raw? maxval grey)
(define-record-type ppm raw? maxval red green blue)
(define (panic s) (error s))
;;; end Chicken
(define (fuck-up) (panic "This shouldn't happen"))
(define first car)
(define second cadr)
(define third caddr)
(define rest cdr)
(define *max-grey* 255)
(define (pnm-width pnm)
(vector-length (vector-ref (cond ((pbm? pnm) (pbm-bitmap pnm))
((pgm? pnm) (pgm-grey pnm))
((ppm? pnm) (ppm-red pnm))
(else (panic "Argument not PNM")))
0)))
(define (pnm-height pnm)
(vector-length (cond ((pbm? pnm) (pbm-bitmap pnm))
((pgm? pnm) (pgm-grey pnm))
((ppm? pnm) (ppm-red pnm))
(else (panic "Argument not PNM")))))
(define (read-pnm pathname)
(define (read-pnm port)
(define (read-pbm raw?)
(let* ((width (inexact->exact (read port)))
(height (inexact->exact (read port)))
(bitmap (let ((v (make-vector height)))
(let loop ((i 0))
(if (< i height)
(begin (vector-set! v i (make-vector width))
(loop (+ i 1)))))
v)))
(call-with-current-continuation
(lambda (return)
(cond
(raw? (panic "Cannot (yet) read a raw pbm image"))
(else
(do ((y 0 (+ y 1))) ((= y height))
(do ((x 0 (+ x 1))) ((= x width))
(let ((v (read port)))
(if (eof-object? v) (return #f))
(vector-set! (vector-ref bitmap y) x (not (zero? v))))))))))
(make-pbm raw? bitmap)))
(define (read-pgm raw?)
(let* ((width (inexact->exact (read port)))
(height (inexact->exact (read port)))
(maxval (inexact->exact (read port)))
(size (* width height))
(grey (let ((v (make-vector height)))
(let loop ((i 0))
(if (< i height)
(begin (vector-set! v i (make-vector width))
(loop (+ i 1)))))
v)))
(call-with-current-continuation
(lambda (return)
(cond
(raw? (read-char port)
(do ((y 0 (+ y 1))) ((= y height))
(do ((x 0 (+ x 1))) ((= x width))
(let ((c (read-char port)))
(if (eof-object? c) (return #f))
(vector-set! (vector-ref grey y) x (char->integer c))))))
(else (do ((y 0 (+ y 1))) ((= y height))
(do ((x 0 (+ x 1))) ((= x width))
(let ((v (read port)))
(if (eof-object? v) (return #f))
(vector-set! (vector-ref grey y) x (inexact->exact v)))))))))
(make-pgm raw? maxval grey)))
(define (read-ppm raw?)
(let* ((width (inexact->exact (read port)))
(height (inexact->exact (read port)))
(maxval (inexact->exact (read port)))
(size (* width height))
(red (let ((v (make-vector height)))
(let loop ((i 0))
(if (< i height)
(begin (vector-set! v i (make-vector width))
(loop (+ i 1)))))
v))
(green (let ((v (make-vector height)))
(let loop ((i 0))
(if (< i height)
(begin (vector-set! v i (make-vector width))
(loop (+ i 1)))))
v))
(blue (let ((v (make-vector height)))
(let loop ((i 0))
(if (< i height)
(begin (vector-set! v i (make-vector width))
(loop (+ i 1)))))
v)))
(call-with-current-continuation
(lambda (return)
(cond
(raw? (read-char port)
(do ((y 0 (+ y 1))) ((= y height))
(do ((x 0 (+ x 1))) ((= x width))
(let* ((c1 (read-char port))
(c2 (read-char port))
(c3 (read-char port)))
(if (eof-object? c1) (return #f))
(vector-set! (vector-ref red y) x (char->integer c1))
(vector-set! (vector-ref green y) x (char->integer c2))
(vector-set! (vector-ref blue y) x (char->integer c3))))))
(else (do ((y 0 (+ y 1))) ((= y height))
(do ((x 0 (+ x 1))) ((= x width))
(let* ((v1 (read port))
(v2 (read port))
(v3 (read port)))
(if (eof-object? v1) (return #f))
(vector-set! (vector-ref red y) x (inexact->exact v1))
(vector-set! (vector-ref green y) x (inexact->exact v2))
(vector-set! (vector-ref blue y) x (inexact->exact v3)))))))))
(make-ppm raw? maxval red green blue)))
(let ((format (read port)))
(case format
((P1) (read-pbm #f))
((P2) (read-pgm #f))
((P3) (read-ppm #f))
((P4) (read-pbm #t))
((P5) (read-pgm #t))
((P6) (read-ppm #t))
(else (panic "Incorrect format for a pnm image")))))
(if (string=? pathname "-")
(read-pnm (current-input-port))
(call-with-input-file pathname read-pnm)))
(define (write-pnm pnm pathname)
(define (write-pnm port)
(define (write-pbm pbm)
(let ((width (pnm-width pbm))
(height (pnm-height pbm))
(bitmap (pbm-bitmap pbm)))
(write (if (pbm-raw? pbm) 'P4 'P1) port)
(newline port)
(write width port)
(write-char #\space port)
(write height port)
(newline port)
(if (pbm-raw? pbm)
(panic "Cannot (yet) write a raw pbm image")
(do ((y 0 (+ y 1))) ((= y height))
(do ((x 0 (+ x 1))) ((= x width))
(write (if (vector-ref (vector-ref bitmap y) x) 1 0) port)
(newline port))))))
(define (write-pgm pgm)
(let ((width (pnm-width pgm))
(height (pnm-height pgm))
(grey (pgm-grey pgm)))
(if (pgm-raw? pgm)
(do ((y 0 (+ y 1))) ((= y height))
(do ((x 0 (+ x 1))) ((= x width))
(if (> (vector-ref (vector-ref grey y) x) 255)
(panic "Grey value too large for raw pgm file format")))))
(write (if (pgm-raw? pgm) 'P5 'P2) port)
(newline port)
(write width port)
(write-char #\space port)
(write height port)
(newline port)
(write (pgm-maxval pgm) port)
(newline port)
(if (pgm-raw? pgm)
(do ((y 0 (+ y 1))) ((= y height))
(do ((x 0 (+ x 1))) ((= x width))
(write-char
(integer->char (vector-ref (vector-ref grey y) x)) port)))
(do ((y 0 (+ y 1))) ((= y height))
(do ((x 0 (+ x 1))) ((= x width))
(write (vector-ref (vector-ref grey y) x) port)
(newline port))))))
(define (write-ppm ppm)
(let ((width (pnm-width ppm))
(height (pnm-height ppm))
(red (ppm-red ppm))
(green (ppm-green ppm))
(blue (ppm-blue ppm)))
(if (ppm-raw? ppm)
(do ((y 0 (+ y 1))) ((= y height))
(do ((x 0 (+ x 1))) ((= x width))
(if (or (> (vector-ref (vector-ref red y) x) 255)
(> (vector-ref (vector-ref green y) x) 255)
(> (vector-ref (vector-ref blue y) x) 255))
(panic "Color value too large for raw ppm file format")))))
(write (if (ppm-raw? ppm) 'P6 'P3) port)
(newline port)
(write width port)
(write-char #\space port)
(write height port)
(newline port)
(write (ppm-maxval ppm) port)
(newline port)
(if (ppm-raw? ppm)
(do ((y 0 (+ y 1))) ((= y height))
(do ((x 0 (+ x 1))) ((= x width))
(write-char (integer->char (vector-ref (vector-ref red y) x)) port)
(write-char (integer->char (vector-ref (vector-ref green y) x)) port)
(write-char
(integer->char (vector-ref (vector-ref blue y) x)) port)))
(do ((y 0 (+ y 1))) ((= y height))
(do ((x 0 (+ x 1))) ((= x width))
(write (vector-ref (vector-ref red y) x) port)
(newline port)
(write (vector-ref (vector-ref green y) x) port)
(newline port)
(write (vector-ref (vector-ref blue y) x) port)
(newline port))))))
(cond ((pbm? pnm) (write-pbm pnm))
((pgm? pnm) (write-pgm pnm))
((ppm? pnm) (write-ppm pnm))
(else (panic "Non-PNM argument to WRITE-PNM"))))
(if (string=? pathname "-")
(write-pnm (current-output-port))
(call-with-output-file (string-append pathname
(cond ((pbm? pnm) ".pbm")
((pgm? pnm) ".pgm")
((ppm? pnm) ".ppm")
(else (fuck-up))))
write-pnm
;;; begin Chez
'replace
;;; end Chez
)))
(define (pgm-smooth pgm sigma)
(if (not (pgm? pgm)) (panic "Argument to PGM-SMOOTH is not a PGM"))
(let* ((height (pnm-height pgm))
(width (pnm-width pgm))
(grey1 (pgm-grey pgm))
(grey2 (let ((v (make-vector height)))
(let loop ((i 0))
(if (< i height)
(begin (vector-set! v i (make-vector width 0))
(loop (+ i 1)))))
v)))
(do ((y sigma (+ y 1))) ((= y (- height sigma)))
(do ((x sigma (+ x 1))) ((= x (- width sigma)))
(do ((i (- y sigma) (+ i 1))) ((= i (+ y sigma 1)))
(do ((j (- x sigma) (+ j 1))) ((= j (+ x sigma 1)))
(vector-set!
(vector-ref grey2 y) x (+ (vector-ref (vector-ref grey2 y) x)
(vector-ref (vector-ref grey1 i) j)))))
(vector-set! (vector-ref grey2 y) x
(inexact->exact
(floor (/ (vector-ref (vector-ref grey2 y) x)
(* (+ sigma sigma 1) (+ sigma sigma 1))))))))
(make-pgm (pgm-raw? pgm) *max-grey* grey2)))
(define (normal-flow-magnitude pgm1 pgm2 epsilon sigma sensitivity)
(if (not (and (pgm? pgm1)
(pgm? pgm2)
(= (pgm-maxval pgm1) (pgm-maxval pgm2))
(eq? (pgm-raw? pgm1) (pgm-raw? pgm2))
(= (pnm-width pgm1) (pnm-width pgm2))
(= (pnm-height pgm1) (pnm-height pgm2))))
(panic "Arguments to NORMAL-FLOW-MAGNITUDE are not matching PGMs"))
(let* ((width (pnm-width pgm1))
(height (pnm-height pgm1))
(e1 (pgm-grey (pgm-smooth pgm1 sigma)))
(e2 (pgm-grey (pgm-smooth pgm2 sigma)))
(m (let ((v (make-vector height)))
(let loop ((i 0))
(if (< i height)
(begin (vector-set! v i (make-vector width 0))
(loop (+ i 1)))))
v)))
(do ((i 0 (+ i 1))) ((= i (- height 1)))
(do ((j 0 (+ j 1))) ((= j (- width 1)))
(let* ((ex (/ (- (+ (vector-ref (vector-ref e1 (+ i 1)) j)
(vector-ref (vector-ref e1 (+ i 1)) (+ j 1))
(vector-ref (vector-ref e2 (+ i 1)) j)
(vector-ref (vector-ref e2 (+ i 1)) (+ j 1)))
(+ (vector-ref (vector-ref e1 i) j)
(vector-ref (vector-ref e1 i) (+ j 1))
(vector-ref (vector-ref e2 i) j)
(vector-ref (vector-ref e2 i) (+ j 1))))
4.0))
(ey (/ (- (+ (vector-ref (vector-ref e1 i) (+ j 1))
(vector-ref (vector-ref e1 (+ i 1)) (+ j 1))
(vector-ref (vector-ref e2 i) (+ j 1))
(vector-ref (vector-ref e2 (+ i 1)) (+ j 1)))
(+ (vector-ref (vector-ref e1 i) j)
(vector-ref (vector-ref e1 (+ i 1)) j)
(vector-ref (vector-ref e2 i) j)
(vector-ref (vector-ref e2 (+ i 1)) j)))
4.0))
(et (/ (- (+ (vector-ref (vector-ref e2 i) j)
(vector-ref (vector-ref e2 i) (+ j 1))
(vector-ref (vector-ref e2 (+ i 1)) j)
(vector-ref (vector-ref e2 (+ i 1)) (+ j 1)))
(+ (vector-ref (vector-ref e1 i) j)
(vector-ref (vector-ref e1 i) (+ j 1))
(vector-ref (vector-ref e1 (+ i 1)) j)
(vector-ref (vector-ref e1 (+ i 1)) (+ j 1))))
4.0))
(l (sqrt (+ (* ex ex) (* ey ey)))))
(vector-set!
(vector-ref m i) j
(min *max-grey*
(inexact->exact
(floor
(* *max-grey*
(/ (if (< l epsilon) 0.0 (/ (abs et) l)) sensitivity)))))))))
(pgm-smooth (make-pgm (pgm-raw? pgm1) *max-grey* m) sigma)))
(define (test pgm1 pgm2)
(write-pnm (normal-flow-magnitude pgm1 pgm2 1.25 1 20.0) "pick-up-flow")
#f)
(let ((pgm1 (read-pnm "pick-up00-0.pgm"))
(pgm2 (read-pnm "pick-up00-1.pgm")))
(do ((i 0 (+ i 1))) ((= i 10))
(test pgm1 pgm2)
(test pgm1 pgm2)))
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