# dibuat oleh Adrian Rosebrock
# pyimagesearch.com
# didokumentasikan ulang dalam bahasa Indonesia
# hehe

# import paket yang diperlukan
from imutils.perspective import four_point_transform
from imutils import contours
import imutils
import cv2
 
# membuat kamus segmen dari tiap digit
DIGITS_LOOKUP = {
	(1, 1, 1, 0, 1, 1, 1): 0,
	(0, 0, 1, 0, 0, 1, 0): 1,
	(1, 0, 1, 1, 1, 1, 0): 2,
	(1, 0, 1, 1, 0, 1, 1): 3,
	(0, 1, 1, 1, 0, 1, 0): 4,
	(1, 1, 0, 1, 0, 1, 1): 5,
	(1, 1, 0, 1, 1, 1, 1): 6,
	(1, 0, 1, 0, 0, 1, 0): 7,
	(1, 1, 1, 1, 1, 1, 1): 8,
	(1, 1, 1, 1, 0, 1, 1): 9,
}
# menggunggah file gambar
image = cv2.imread("example01.jpg") # SOURCE HERE <=======================
 
# proses awal, mengatur ukuran, ubah ke grayscale, memblur dan
# memcompute edge map
image = imutils.resize(image, height=500)
gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
blurred = cv2.GaussianBlur(gray, (5, 5), 0)
edged = cv2.Canny(blurred, 50, 200, 255)

# mencari contour di edge mao, lalu mengurutkanya berdasar ukuran
# di urutan descending
cnts = cv2.findContours(edged.copy(), cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
cnts = cnts[0] if imutils.is_cv2() else cnts[1]
cnts = sorted(cnts, key=cv2.contourArea, reverse=True)
displayCnt = None
 
# loop di contour
for c in cnts:
	# memperkirakan contour
	peri = cv2.arcLength(c, True)
	approx = cv2.approxPolyDP(c, 0.02 * peri, True)
 
	# jika contour memiliki 4 vertikal, maka kita dapat displaynya
	if len(approx) == 4:
		displayCnt = approx
		break

# mengekstrak display dan menerapkan four point transform
warped = four_point_transform(gray, displayCnt.reshape(4, 2))
output = four_point_transform(image, displayCnt.reshape(4, 2))

# menthreshold gambar yang sudah diluruskan, dan mengaplikasikan serangkaian
# aplikasi morfologi untuk membersihkan gambar yang di threshold
thresh = cv2.threshold(warped, 0, 255,
	cv2.THRESH_BINARY_INV | cv2.THRESH_OTSU)[1]
kernel = cv2.getStructuringElement(cv2.MORPH_ELLIPSE, (1, 5))
thresh = cv2.morphologyEx(thresh, cv2.MORPH_OPEN, kernel)

# mencari contour di gambar yang telah di threshold, lalu
# menginisialisasi daftar contour digit
cnts = cv2.findContours(thresh.copy(), cv2.RETR_EXTERNAL,
	cv2.CHAIN_APPROX_SIMPLE)
cnts = cnts[0] if imutils.is_cv2() else cnts[1]
digitCnts = []
 
# loop di area kandidat digit
for c in cnts:
	# compute the bounding box of the contour
	(x, y, w, h) = cv2.boundingRect(c)
 
	# if the contour is sufficiently large, it must be a digit
	if w >= 15 and (h >= 30 and h <= 40):
		digitCnts.append(c)

# mengurutkan contour dari kanan ke kiri, lalu inisialisasi digit 
# sebenarnya dari contour tsb
digitCnts = contours.sort_contours(digitCnts,
	method="left-to-right")[0]
digits = []
# loop di masing digit
for c in digitCnts:
	# extract the digit ROI
	(x, y, w, h) = cv2.boundingRect(c)
	roi = thresh[y:y + h, x:x + w]
 
	# menghitung lebar dan tinggi dari setiap digit
	(roiH, roiW) = roi.shape
	(dW, dH) = (int(roiW * 0.25), int(roiH * 0.15))
	dHC = int(roiH * 0.05)
 
	# mendefinisikan set dari 7 segment
	segments = [
		((0, 0), (w, dH)),	# atas
		((0, 0), (dW, h // 2)),	# atas-kiri
		((w - dW, 0), (w, h // 2)),	# atas-kanan
		((0, (h // 2) - dHC) , (w, (h // 2) + dHC)), # tengah
		((0, h // 2), (dW, h)),	# bawah-kiri
		((w - dW, h // 2), (w, h)),	# bawah-kanan
		((0, h - dH), (w, h))	# bawah
	]
	on = [0] * len(segments)
	# loop terhadap masing2 segments
	for (i, ((xA, yA), (xB, yB))) in enumerate(segments):
		# extract the segment ROI, count the total number of
		# thresholded pixels in the segment, and then compute
		# the area of the segment
		segROI = roi[yA:yB, xA:xB]
		total = cv2.countNonZero(segROI)
		area = (xB - xA) * (yB - yA)
 
		# if the total number of non-zero pixels is greater than
		# 50% of the area, mark the segment as "on"
		if total / float(area) > 0.5:
			on[i]= 1
			
	# lookup digitnya dan kasih kotak disana
	digit = DIGITS_LOOKUP[tuple(on)]
	digits.append(digit)
	cv2.rectangle(output, (x, y), (x + w, y + h), (0, 255, 0), 1)
	cv2.putText(output, str(digit), (x - 10, y - 10),
		cv2.FONT_HERSHEY_SIMPLEX, 0.65, (0, 255, 0), 2)

# menampilkan digit
print(u"{}{}.{} \u00b0C".format(*digits))
cv2.imshow("Input", image)
cv2.imshow("Output", output)
cv2.waitKey(0)


