不能使用OpenCv/Tkinter/Python保存和显示图像

Question

我正在用Tkinter创建一个图形界面来确定NDVI，我使用Opencv在植被中制作过滤器。到目前为止一切都很好。 当计算NDVI时，得到的图像是黑色的：（，您不能保存它，但是当您打印图像时，您会得到每个像素的值。在

代码

def ndvi(self,*args):
        #self.res_guar esta en BGR

        self.res_guar = self.res_guar.astype('float')
        (self.r,self.g,self.b) = cv2.split(self.res_guar)

        #Calculo NDVI
        self.resta = cv2.subtract(self.r,self.b)
        self.suma = cv2.add(self.r,self.b)
        self.ndvi = cv2.divide(self.resta,self.suma)


        self.rows,self.cols,_ = self.res_guar.shape
        self.y = np.zeros((self.rows,self.cols,3),dtype=np.uint8)  # for output
        greenyellow = [4,255,173]
        yellow = [0,255,255]
        yellowred = [4,111,255]
        green = [0,255,0]
        blue = [255,0,0]
        red = [0,0,255]
        white = [255,255,255]
        black = [0,0,0]

        for i in range(self.rows):
            for j in range(self.cols):
                k = self.ndvi[i,j]
                if 0.0 < k < 0.2 :
                    self.y[i,j] = yellowred
                    #print "Pintando AmarilloRojo"
                    break
                elif 0.2 < k < 0.4 :
                    self.y[i,j] = yellow
                    #print "Pintando Amarillo"
                    break
                elif 0.4 < k < 0.6 :
                    self.y[i,j] = greenyellow
                    #print "Pintando AmarilloVerde"
                    break               
                elif k > 0.6 :
                    self.y[i,j] = green
                    #print "Pintando Verde"
                    break                   
                else:
                    self.y[i,j] = black
                    #print "Negro"
                    break

        #Print Imagen resultante
        print(self.y)
        #Guardar Imagen
        cv2.imwrite('NDVI.jpg',self.y)
        #Mostrar Imagen
        ndvi = Image.fromarray(self.y,'RGB').resize((570,650), Image.ANTIALIAS)
        # convierte a formato ImageTk 
        ndvi = ImageTk.PhotoImage(ndvi)
        # Ajuste de la imagen de hsv a tk etiqueta de imagen
        self.original_img_lbl.configure(image=ndvi)
        # adding a reference to the image to Prevent python's garbage collection from deleting it
        #Anadiendo una referencia a la imagen para evitar que python garbage collection lo elimine
        self.original_img_lbl.image = ndvi

图像原稿 url=http://es.zimagez.com/zimage/capturadepantallade2016-12-2310-08-43.php

起诉 url=http://es.zimagez.com/zimage/capturadepantallade2016-12-2310-09-33.php

NDVI指数 url=http://es.zimagez.com/zimage/capturadepantallade2016-12-2310-09-40.php

打印self.y

^{pr2}$

NDVI图像已保存 url=http://es.zimagez.com/zimage/ndvi.php

Answer 1

从您的if语句中取出所有break语句。所发生的是您的if语句更改了一个像素的值，但随后您breakfor循环而没有写入其他像素。删除所有的break语句，您应该没事。在