Angle of page rotation can be determined with c wrapper function.

Samo Penic

2019-06-11 5d557801d61beb4970ffc4c62ba81cd0cd76db68

 aoi_ocr/Ocr.py

@@ -4,6 +4,7 @@
import numpy as np
import os
import pkg_resources
from .rotation_wrapper import get_scan_angle

markerfile = '/template-sq.png'  # always use slash
markerfilename = pkg_resources.resource_filename(__name__, markerfile)
@@ -77,6 +78,12 @@
        if xpos > self.imgHeight / 2.0 and ypos > self.imgWidth / 2.0:
            self.rotateAngle(180)

        #small rotation check
        angle=get_scan_angle(self.filename)
        if angle>0.1 or angle<-0.1:
            print("Rotating for angle of {}.".format(angle))
            self.rotateAngle(-angle)

    def rotateAngle(self, angle=0):
        # rot_mat = cv2.getRotationMatrix2D(
        #    (self.imgHeight / 2, self.imgWidth / 2), angle, 1.0
@@ -99,7 +106,8 @@
        # todo, make better tresholding
    def imgTreshold(self):
        (self.thresh, self.bwimg) = cv2.threshold(
            self.img, 128, 255, cv2.THRESH_BINARY | cv2.THRESH_OTSU
            self.img, 128, 255,
            cv2.THRESH_BINARY | cv2.THRESH_OTSU
        )

    def getSkewAngle(self):
@@ -215,12 +223,12 @@
        self.locateUpMarkers()
        self.locateRightMarkers()

        roixoff = 10
        roiyoff = 5
        roiwidth = 50
        roixoff = 4
        roiyoff = 0
        roiwidth = 55
        roiheight = roiwidth
        totpx = roiwidth * roiheight

        cimg = cv2.cvtColor(self.img, cv2.COLOR_GRAY2BGR)
        self.answerMatrix = []
        for y in self.yMarkerLocations[0]:
            oneline = []
@@ -232,6 +240,8 @@
                # cv2.imwrite('ans_x'+str(x)+'_y_'+str(y)+'.png',roi)
                black = totpx - cv2.countNonZero(roi)
                oneline.append(black / totpx)
                cv2.rectangle(cimg, (x - roixoff,y - roiyoff), (x + int(roiwidth - roixoff),y + int(roiheight - roiyoff)), (0, 255, 255), 2)
            cv2.imwrite('/tmp/debug_answers.png',cimg)
            self.answerMatrix.append(oneline)

    def get_enhanced_sid(self):
@@ -242,7 +252,7 @@
        es, err, warn = getSID(
            self.img[
                int(0.04 * self.imgHeight) : int(0.095 * self.imgHeight),
                int(0.7 * self.imgWidth) : int(0.99 * self.imgWidth),
                int(0.65 * self.imgWidth) : int(0.95 * self.imgWidth),
            ],
            self.sid_classifier,
            sid_mask,
@@ -275,7 +285,7 @@
            data = qrdata.split(",")
            retval = {
                "exam_id": int(data[1]),
                "page_no": int(data[3])+1,
                "page_no": int(data[3]),
                "paper_id": int(data[2]),
                "faculty_id": int(data[0]),
                "sid": None
@@ -287,23 +297,26 @@

    def get_paper_ocr_data(self):
        data = self.get_code_data()
        if self.QRData is None:
            return None
        data["qr"] = bytes.decode(self.QRData, 'utf8')
        data["errors"] = self.errors
        data["warnings"] = self.warnings
        data["up_position"] = (
            list(self.xMarkerLocations[1] / self.imgWidth),
            list(self.yMarkerLocations[1] / self.imgHeight),
            list(self.xMarkerLocations[0] / self.imgWidth),
            list(self.xMarkerLocations[1] / self.imgHeight),
        )
        data["right_position"] = (
            list(self.xMarkerLocations[1] / self.imgWidth),
            list(self.yMarkerLocations[0] / self.imgWidth),
            list(self.yMarkerLocations[1] / self.imgHeight),
        )
        data["ans_matrix"] = (
            (np.array(self.answerMatrix) > self.settings["answer_threshold"]) * 1
        ).tolist()
        if data["sid"] is None and data["page_no"] == 2:
        if data["sid"] is None and data["page_no"] == 1:
            data["sid"] = self.get_enhanced_sid()
        output_filename=os.path.join(self.output_path, '.'.join(self.filename.split('/')[-1].split('.')[:-1])+".png")
        cv2.imwrite(output_filename, self.img)
        data['output_filename']=output_filename
        print(np.array(self.answerMatrix))
        return data