Spatial and temporal on depth image

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Hi,

I would like to do Spatial and temporal on a depth image. spatial average can be achieved by convolution (cv::filter2D), for temporal average you would need to accumulate() N images, and divide by N but I don't know how to use OpenCV to do that.

What I tried for spatial filter is

            cv::Mat dst;
            int kernel_size = 2;
            cv::Mat kernel = cv::Mat::ones(kernel_size, kernel_size, CV_32F) / (float)(kernel_size * kernel_size);
            // Apply filter
            filter2D(depth_image_ocv, dst, -1, kernel, cv::Point(-1, -1), 0, cv::BORDER_DEFAULT);

but the result is horrible as shown in the image.

            cv::imshow("Filtered Depth", dst);
            cv::imshow("Depth", depth_image_ocv);