我試着翻譯下面的Python功能,應用於口罩,圖像,到Java:翻譯Python函數來敷面膜圖像轉換成Java
# Applies an image mask.
def region_of_interest(img, vertices):
#defining a blank mask to start with
mask = np.zeros_like(img)
#defining a 3 channel or 1 channel color to fill the mask with depending on the input image
if len(img.shape) > 2:
channel_count = img.shape[2] # i.e. 3 or 4 depending on your image
ignore_mask_color = (255,) * channel_count
else:
ignore_mask_color = 255
#filling pixels inside the polygon defined by "vertices" with the fill color
cv2.fillPoly(mask, vertices, ignore_mask_color)
#returning the image only where mask pixels are nonzero
masked_image = cv2.bitwise_and(img, mask)
return masked_image
到目前爲止,這是我」 ve得到了:
public static opencv_core.Mat applyMask(opencv_core.Mat image, opencv_core.MatVector vertices) {
opencv_core.Mat mask = opencv_core.Mat.zeros(image.size(), opencv_core.CV_8U).asMat();
opencv_core.Scalar color = new opencv_core.Scalar(image.channels()); // 3
double[] colors = new double[] {
255.0, 255.0, 255.0, 255.0,
255.0, 255.0, 255.0, 255.0,
255.0, 255.0, 255.0, 255.0};
color.put(colors, 0, colors.length);
opencv_imgproc.fillPoly(mask, vertices, color);
opencv_core.Mat dst = new opencv_core.Mat();
opencv_core.bitwise_and(image, mask, dst);
return dst;
}
但是,它不工作。當我嘗試在下面的示例中調用此方法,如:
opencv_core.MatVector points = new opencv_core.MatVector(
new opencv_core.Mat(2, 3, opencv_core.CV_32F, new IntPointer(1, 2, 3, 4, 5, 6))
);
opencv_core.MatVector vertices = new opencv_core.MatVector(points);
opencv_core.Mat masked = LaneManager.applyMask(src, vertices);
(我假設這是建立三個點的2x3矩陣,兩個座標每個(1,2)
,(3, 4)
和(5,6)
正道)
我得到一個異常:
java.lang.RuntimeException: std::bad_alloc
at org.bytedeco.javacpp.opencv_imgproc.fillPoly(Native Method)
我使用的OpenCV作爲Maven的通過由中央提供org.bytedeco.javacpp-presets:opencv-platform:3.2.0-1.3
。
我必須承認我在這裏感到茫然:與上面的Python函數做同樣事情的慣用Java方法是什麼?
我認爲你在找什麼是與這個其他stackoverflow帖子http:// stackoverflow。COM /問題/ 221830 /設置的BufferedImage-α-面具式的Java。希望這可以幫助。 –
你是如何初始化你發送到applyMask的src變量的? – Daedalus
一個可疑的事情是,你顯然正在爲12通道色彩分量的3通道圖像定義顏色。這是不對的。 – Dave