xapp1167 hls提供的中值滤波，为什么放到板上显示一张黑色图片

void image_filter(AXI_STREAM& INPUT_STREAM, AXI_STREAM& OUTPUT_STREAM, int rows, int cols) {
//Create AXI streaming interfaces for the core
#pragma HLS RESOURCE variable=INPUT_STREAM core=AXIS metadata="-bus_bundle INPUT_STREAM"
#pragma HLS RESOURCE variable=OUTPUT_STREAM core=AXIS metadata="-bus_bundle OUTPUT_STREAM"

#pragma HLS RESOURCE core=AXI_SLAVE variable=rows metadata="-bus_bundle CONTROL_BUS"
#pragma HLS RESOURCE core=AXI_SLAVE variable=cols metadata="-bus_bundle CONTROL_BUS"
#pragma HLS RESOURCE core=AXI_SLAVE variable=return metadata="-bus_bundle CONTROL_BUS"

#pragma HLS INTERFACE ap_stable port=rows
#pragma HLS INTERFACE ap_stable port=cols

RGB_IMAGE img_0(rows, cols);
RGB_IMAGE img_1(rows, cols);
#pragma HLS dataflow
hls::AXIvideo2Mat(INPUT_STREAM, img_0);

RGB_PIXEL buffer[3];

assert(rows <= MAX_HEIGHT);
assert(cols <= MAX_WIDTH);
for(int row = 0; row < rows; row++) {
#pragma HLS loop_flatten off
   for(int col = 0; col < cols; col++) {
#pragma HLS pipeline II=1
         RGB_PIXEL p;
         img_0 >> p;
         buffer[2] = buffer[1];
         buffer[1] = buffer[0];
         buffer[0] = p;
         // Because we have a buffer above, the start of one line
         // will be processed with data from the previous line.
         // The check below is a simple, relatively unsophisticated
         // way to handle the edge condition.  It does result in
         // introducing a spatial shift in the image because the
         // filter is non-causal.
         if(col > 1) {
            for(int i = 0; i < 3; i++) {
                  bool a = buffer[2].val[i] > buffer[1].val[i];
                  bool b = buffer[2].val[i] > buffer[0].val[i];
                  bool c = buffer[1].val[i] > buffer[0].val[i];

                  if(a && c) {
                     p.val[i] = buffer[1].val[i];
                  } else if(b && !c) {
                     p.val[i] = buffer[0].val[i];
                  } else {
                     p.val[i] = buffer[2].val[i];
                  }
            }
         }

         img_1 << p;
      }
}
hls::Mat2AXIvideo(img_1, OUTPUT_STREAM);
}

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