ウェブカメラでぴぴっとAmazon中古価格相場とか調べることができたら不要本の処分がはかどりそうだということで適当に実装してみた。
を読み取ると、
↓
left side character(1) not found: 1111111 left side character(1) not found: 1111111 left side character(1) not found: 1111111 left side character(1) not found: 1111111 9784873113364
バーコード（JANコード）の規格は
http://www.barcode.ne.jp/about_barcode/code/jan.html
に詳しい。必要なことは全部書いてある。
ハマったところ
- VideoCaptureがNullを返す OR 真っ黒な画像を返すことがある
cam = VideoCapture.Device(devnum=deviceNumber)
cam.setResolution(640, 480)
cam.getImage()
time.sleep(1)
img = None
while True:
img = cam.getImage()
if None != img:
break
time.sleep(1)
みたいに対処した。
- WEBカメラの性能がプアすぎてどうにもこうにも
適当な本のバーコード部分を拡大コピーして対処。画像でバーコード部分の上にハサミが置いてあるのはコピー故にたわむのを押さえている…。
コードべたっと貼り付け。
ちょーっと手抜き過ぎですな。実際に使うときはもちっとまじめにやらないといけない。
# -*- coding: utf-8 -*- import math import PIL import Image import ImageEnhance import VideoCapture import time #settings deviceNumber = 0 height = 800 width = 600 cdic_odd = {'0001101': 0, '0011001': 1, '0010011': 2, '0111101': 3, '0100011': 4, '0110001': 5, '0101111': 6, '0111011': 7, '0110111': 8, '0001011': 9} cdic_even = {'0100111': 0, '0110011': 1, '0011011': 2, '0100001': 3, '0011101': 4, '0111001': 5, '0000101': 6, '0010001': 7, '0001001': 8, '0010111': 9} cdic_right = {'1110010': 0, '1100110': 1, '1101100': 2, '1000010': 3, '1011100': 4, '1001110': 5, '1010000': 6, '1000100': 7, '1001000': 8, '1110100': 9} pdic = {'OOOOOO': 0, 'OOEOEE': 1, 'OOEEOE': 2, 'OOEEEO': 3, 'OEOOEE': 4, 'OEEOOE': 5, 'OEEEOO': 6, 'OEOEOE': 7, 'OEOEEO': 8, 'OEEOEO': 9} def getJAN(img, threthold): width = img.size[0] height = img.size[1] h = (height / 2) line = [] for i in xrange(width): v = img.getpixel( (i, h) ) v = float(255 - v) / 255 line.append(v) for i in xrange( len(line) ): if 0.98 < line[i]: del line[:i] break lineLen = len(line) for i in xrange(lineLen): if 0.98 < line[lineLen - i - 1]: del line[lineLen - i:] break rate = float(len(line) - 1) / 95 temp = [] for i in xrange(95): start = i * rate end = start + rate val = 0 for j in xrange( int(math.ceil(start)), int(end) ): val += line[j] p = start - int(start) if 0 < p: val += line[int(start)] * (1 - p) p = end - int(end) if 0 < p: val += line[int(end)] * p temp.append(val) line = temp temp = [] for i in line: if rate * threthold < i: temp.append(1) else: temp.append(0) line = temp OE = '' left = [] for i in xrange(1, 7): v = '' sPos = 3 + ( (i - 1) * 7) for j in xrange(sPos, sPos + 7): v += str(line[j]) if cdic_even.has_key(v): OE += 'E' left.append(cdic_even[v]) elif cdic_odd.has_key(v): OE += 'O' left.append(cdic_odd[v]) else: raise Exception('left side character(%s) not found: %s' % (i, v) ) if pdic.has_key(OE): left.insert(0, pdic[OE]) else: raise Exception('prefix character not found: %s' % OE) right = [] for i in xrange(1, 6): v = '' sPos = 50 + ( (i - 1) * 7) for j in xrange(sPos, sPos + 7): v += str(line[j]) if cdic_right.has_key(v): right.append(cdic_right[v]) else: raise Exception('right side character(%s) not found: %s' % (i, v) ) JAN = left + right oddSum = 0 evenSum = 0 for i in xrange(len(JAN)): if 0 == i % 2: evenSum += JAN[i] else: oddSum += JAN[i] CC = int( str( (oddSum * 3) + evenSum )[-1] ) if CC < 10: CC = 10 - CC else: CC = 0 for i in xrange(1, 1): v = '' sPos = 115 + ( (i - 1) * 7) for j in xrange(sPos, sPos + 7): v += str(line[j]) if ( not cdic_right.has_key(v) ) or (cdic_right[v] != CC): raise Exception('modular check error: %s' % v) JAN.append(CC) JANStr = '' for i in JAN: JANStr += `i` return JANStr lastJAN = None def capture(): cam = VideoCapture.Device(devnum=deviceNumber) cam.setResolution(640, 480) cam.getImage() time.sleep(1) img = None while True: img = cam.getImage() if None != img: break time.sleep(1) #img = Image.open('test.jpg') img = img.resize( (height, width), PIL.Image.ANTIALIAS ) #img.save('preview1.jpg') img = img.convert("L") enhancer = ImageEnhance.Brightness(img) img = enhancer.enhance(1.6) enhancer = ImageEnhance.Contrast(img) img = enhancer.enhance(1.8) #img.save('preview2.jpg') for i in xrange(10): try: JAN = getJAN(img, 0.3 + (0.05 * i) ) except Exception, e: print e continue global lastJAN if JAN == lastJAN: return lastJAN = JAN return JAN def main(): while True: JAN = capture() if JAN: print JAN break if __name__ == "__main__": main()
