旋转图片，空余部分补黑色，并将原坐标转换

#载入必要的模块
import os
from PIL import Image
from PIL import ImageDraw
import sys
import xlrd
import numpy
import math
import xlsxwriter

#输入
ExcelFile=xlrd.open_workbook(r‘.\标记信息.xlsx‘)
sheet=ExcelFile.sheet_by_index(0)
#输出
workbook = xlsxwriter.Workbook(‘./new/旋转后的标记信息.xlsx‘) #创建工作簿
worksheet = workbook.add_worksheet() #创建工作表



print(sheet.nrows)

for i in range(0,sheet.nrows):
    videoid=str(int(sheet.cell_value(i,0)))
    frameid=str(int(sheet.cell_value(i,1)))
    x1=int(sheet.cell_value(i,2))
    x2=int(sheet.cell_value(i,4))
    x3=int(sheet.cell_value(i,6))
    x4=int(sheet.cell_value(i,8))
    y1=int(sheet.cell_value(i,3))
    y2=int(sheet.cell_value(i,5))
    y3=int(sheet.cell_value(i,7))
    y4=int(sheet.cell_value(i,9))
    bookname=sheet.cell_value(i,10)

    #print([x1,y1,x2,y2,x4,y4,x3,y3,x1,y1])


    pic_fole_head =  Image.open(videoid+"_"+frameid+".jpg")
    width,height=pic_fole_head.size
    #print([width,height])

    #计算余弦值
    cosa=(y3-y1)/numpy.sqrt(numpy.power(x1-x3,2)+numpy.power(y1-y3,2))
    #计算需要选装的弧度
    rad=numpy.abs(numpy.arccos(cosa))
    #计算需要旋转的角度
    alpha=rad*180/math.pi
    #判断旋转的方向
    #并且计算旋转后的坐标
    if x3<x1:
        pic_fole_head=pic_fole_head.rotate(alpha,0,1)
        yy1=y1*numpy.cos(rad)+(width-x1)*numpy.sin(rad)
        xx1=x1*numpy.cos(rad)+y1*numpy.sin(rad)
        yy2=y2*numpy.cos(rad)+(width-x2)*numpy.sin(rad)
        xx2=x2*numpy.cos(rad)+y1*numpy.sin(rad)
        yy3=y3*numpy.cos(rad)+(width-x3)*numpy.sin(rad)
        xx3=x3*numpy.cos(rad)+y3*numpy.sin(rad)
        yy4=y4*numpy.cos(rad)+(width-x4)*numpy.sin(rad)
        xx4=x4*numpy.cos(rad)+y4*numpy.sin(rad)
    else:
        alpha=-alpha
        pic_fole_head=pic_fole_head.rotate(alpha,0,1)
        yy1=y1*numpy.cos(rad)+x1*numpy.sin(rad)
        xx1=x1*numpy.cos(rad)+(height-y1)*numpy.sin(rad)
        yy2=y2*numpy.cos(rad)+x2*numpy.sin(rad)
        xx2=x2*numpy.cos(rad)+(height-y2)*numpy.sin(rad)
        yy3=y3*numpy.cos(rad)+x3*numpy.sin(rad)
        xx3=x3*numpy.cos(rad)+(height-y3)*numpy.sin(rad)
        yy4=y4*numpy.cos(rad)+x4*numpy.sin(rad)
        xx4=x4*numpy.cos(rad)+(height-y4)*numpy.sin(rad)

    #print([xx1,yy1,xx2,yy2,xx4,yy4,xx3,yy3,xx1,yy1])
    #框出旋转后的书名，测试时用来验证
    #drawObject=ImageDraw.Draw(pic_fole_head)
    #drawObject.line([xx1,yy1,xx2,yy2,xx4,yy4,xx3,yy3,xx1,yy1],(0,5,255),5)
    
    #保存新结果
    worksheet.write(i, 0, int(videoid))
    worksheet.write(i, 1, int(frameid))
    worksheet.write(i, 2, int(xx1))
    worksheet.write(i, 3, int(yy1))
    worksheet.write(i, 4, int(xx2))
    worksheet.write(i, 5, int(yy2))
    worksheet.write(i, 6, int(xx3))
    worksheet.write(i, 7, int(yy3))
    worksheet.write(i, 8, int(xx4))
    worksheet.write(i, 9, int(yy4))
    worksheet.write(i, 10, bookname)
    worksheet.write(i, 11, videoid+"_"+frameid+"_"+str(i+1)+".png")
    #pic_fole_head.show()

    pic_fole_head.save("./new/"+videoid+"_"+frameid+"_"+str(i+1)+".jpg")
workbook.close()