Generate a calibration sheet

fourcell/calibrate.py

@@ -0,0 +1,109 @@
+import argparse
+import sys
+import cv2
+import numpy as np
+from os.path import exists, basename
+from json import dumps
+from common import display, draw_text
+
+IN=25.4
+DPI=600
+W=215.9
+H=279.4
+
+ACTIONS=['generate', 'calibrate', 'scale']
+
+MEASUREMENTS={
+	'A' : { 'x' : 10.0  }, # X 10mm
+	'B' : { 'x' : 50.0  }, # X 50mm
+	'C' : { 'x' : 100.0 }, # X 100mm
+	'D' : { 'y' : 10.0  }, # Y 10mm
+	'E' : { 'y' : 50.0  }, # Y 50mm
+	'F' : { 'y' : 100.0 }  # Y 100mm
+}
+
+def create_blank(width, height):
+	rgb_color=(255,255,255)
+	image = np.zeros((height, width, 3), np.uint8)
+	color = tuple(reversed(rgb_color))
+	image[:] = color
+	return image
+
+def generate (args) :
+	print('generate')
+	print('--------')
+	dpi = DPI
+	if args.dpi is not None :
+		dpi = args.dpi
+	dpmm = dpi / IN
+	print(f'DPI:{dpi}')
+	print(f'DPMM:{dpmm}')
+	w = int(W * dpmm)
+	h = int(H * dpmm)
+	blank = create_blank(w, h)
+	print(f'Created {w},{h}')
+	topLeftX = int(round(w * 0.2))
+	topLeftY = int(round(h * 0.2))
+	bottomRightX = int(round(w * 0.8))
+	bottomRightY = int(round(h * 0.8))
+	hundred = int(round(100.0 * dpmm))
+	five = int(round(2.5 * dpmm))
+	cv2.line(blank, (topLeftX, topLeftY,), (topLeftX + hundred, topLeftY,), [0, 0, 0], 1) 
+	cv2.line(blank, (topLeftX, topLeftY,), (topLeftX, topLeftY + hundred,), [0, 0, 0], 1)
+
+	for i in MEASUREMENTS.keys() :
+		print(i)
+		if 'x' in MEASUREMENTS[i] is not None:
+			print(MEASUREMENTS[i]['x'])
+			x = int(round(MEASUREMENTS[i]['x'] * dpmm))
+			cv2.line(blank, (topLeftX + x, topLeftY + five,), (topLeftX + x, topLeftY - five,), [0, 0, 0], 1) 
+			draw_text(blank, (topLeftX + x, topLeftY - five - int(2 * dpmm),), f'{i}', dpi)
+		elif 'y' in MEASUREMENTS[i] is not None:
+			print(MEASUREMENTS[i]['y'])
+			y = int(round(MEASUREMENTS[i]['y'] * dpmm))
+			cv2.line(blank, (topLeftX + five, topLeftY + y,), (topLeftX - five, topLeftY + y,), [0, 0, 0], 1)
+			draw_text(blank, (topLeftX + five + int(2 * dpmm), topLeftY + y,), f'{i}', dpi)
+
+	#display(blank)
+
+	cv2.imwrite('test.jpg', blank)
+
+def calibrate (args) :
+	print('calibrate')
+	print('---------')
+
+	json = {}
+
+	name = input('Printer name: ')
+	json['name'] = name
+
+	for m in MEASUREMENTS.keys():
+		val = input(f'{m}: ')
+		json[m] = float(val)
+
+	txt=dumps(json, sort_keys = True, indent = 4)
+	if args.output is None :
+		print(f'{txt}')
+	else :
+		print(f'Wrote file to {args.output}')
+
+def scale (args) :
+	print('scale')
+	print('-----')
+
+def main () :
+	parser = argparse.ArgumentParser()
+	parser.add_argument('action',  help='The action to perform', choices=ACTIONS)
+	parser.add_argument('--dpi', '-d', help='DPI to generate', required=False, type=int)
+	parser.add_argument('--input', '-i', help='Input file', required=False)
+	parser.add_argument('--output', '-o', help='Output file', required=False)
+	args = parser.parse_args()
+
+	if args.action == 'generate' :
+		generate(args)
+	elif args.action == 'calibrate' :
+		calibrate(args)
+	elif args.action == 'scale' :
+		scale(args)
+
+main()

fourcell/common.py

@@ -127,3 +127,19 @@ def read_json (textPath) :
     with open(textPath) as json:
         jsonOut = load(json)
     return jsonOut
+
+def draw_text (original, bl, text, dpi) :
+    font                   = cv2.FONT_HERSHEY_SIMPLEX
+    bottomLeftCornerOfText = bl
+    fontScale              = dpi / 96
+    fontColor              = (0, 0, 0)
+    thickness              = 2
+    lineType               = 2
+
+    cv2.putText(original, text, 
+        bottomLeftCornerOfText, 
+        font, 
+        fontScale,
+        fontColor,
+        thickness,
+        lineType)