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做图像识别的时候需要在图片中画出特定大小和角度的矩形框,自己写了一个函数,给定的输入是图片名称,矩形框的位置坐标,长宽和角度,直接输出画好矩形框的图片。
主要思想是先根据x,y坐标和长宽得到矩形,然后通过数学计算得到旋转angle角度后的新矩形框的四个顶点位置坐标,再利用draw.line()函数画出来。
import math import matplotlib.pyplot as plt import numpy as np from pil import image, imagedraw def draw(filename,result): img = image.open(filename) w,h=img.size draw = imagedraw.draw(img) result=np.array(result) x=result[0][0] y=result[0][1] angle=result[0][2] height=result[0][3] width=result[0][4] anglepi = -angle*math.pi/180.0 cosa = math.cos(anglepi) sina = math.sin(anglepi) x1=x-0.5*width y1=y-0.5*height x0=x+0.5*width y0=y1 x2=x1 y2=y+0.5*height x3=x0 y3=y2 x0n= (x0 -x)*cosa -(y0 - y)*sina + x y0n = (x0-x)*sina + (y0 - y)*cosa + y x1n= (x1 -x)*cosa -(y1 - y)*sina + x y1n = (x1-x)*sina + (y1 - y)*cosa + y x2n= (x2 -x)*cosa -(y2 - y)*sina + x y2n = (x2-x)*sina + (y2 - y)*cosa + y x3n= (x3 -x)*cosa -(y3 - y)*sina + x y3n = (x3-x)*sina + (y3 - y)*cosa + y draw.line([(x0n, y0n),(x1n, y1n)], fill=(0, 0, 255)) draw.line([(x1n, y1n),(x2n, y2n)], fill=(255, 0, 0)) draw.line([(x2n, y2n),(x3n, y3n)],fill= (0,0,255)) draw.line([(x0n, y0n), (x3n, y3n)],fill=(255,0,0)) plt.imshow(img) plt.show()
改写成c++
由于c++程序也需要用到这个程序,改写一下
void copentestdlg::onbnclickedanaly() { cstring x,y,angle,width; float xraw[4], yraw[4]; float xnew[4], ynew[4]; float height = 33; if (imagecut==null) { afxmessagebox(_t("未打开图片不能分析")); return; } getdlgitem(idc_ex)->getwindowtext(x); getdlgitem(idc_ey)->getwindowtext(y); getdlgitem(idc_angle)->getwindowtext(angle); getdlgitem(idc_width)->getwindowtext(width); float xf = _tstof(x); //将cstring转成float类型 float yf = _tstof(y); float widthf= _tstof(width); float anglef= _tstof(angle); xraw[1] = xf - 0.5*widthf; yraw[1] = yf - 0.5*height; xraw[0] = xf + 0.5*widthf; yraw[0] = yraw[1]; xraw[2] = xraw[1]; yraw[2] = yf + 0.5*height; xraw[3] = xraw[0]; yraw[3] = yraw[2]; float anglepi = -anglef*pi / 180.0; float cosa = cos(anglepi); float sina = sin(anglepi); xnew[0] = (xraw[0] - xf)*cosa - (yraw[0] - yf)*sina + xf; ynew[0] = (xraw[0] - xf)*sina + (yraw[0] - yf)*cosa + yf; xnew[1] = (xraw[1] - xf)*cosa - (yraw[1] - yf)*sina + xf; ynew[1] = (xraw[1] - xf)*sina + (yraw[1] - yf)*cosa + yf; xnew[2] = (xraw[2] - xf)*cosa - (yraw[2] - yf)*sina + xf; ynew[2] = (xraw[2] - xf)*sina + (yraw[2] - yf)*cosa + yf; xnew[3] = (xraw[3] - xf)*cosa - (yraw[3] - yf)*sina + xf; ynew[3] = (xraw[3] - xf)*sina + (yraw[3] - yf)*cosa + yf; cvline(imagecut, cvpoint(xnew[0], ynew[0]), cvpoint(xnew[1], ynew[1]), cvscalar(0, 0, 255), 3); cvline(imagecut, cvpoint(xnew[1], ynew[1]), cvpoint(xnew[2], ynew[2]), cvscalar(255, 0, 0), 3); cvline(imagecut, cvpoint(xnew[2], ynew[2]), cvpoint(xnew[3], ynew[3]), cvscalar(0, 0, 255), 3); cvline(imagecut, cvpoint(xnew[0], ynew[0]), cvpoint(xnew[3], ynew[3]), cvscalar(255, 0, 0), 3); drawpictohdc(imagecut, idc_cut); pedit->replacesel(_t("图片已修改\r\n")); }
效果图
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