static vx_convolution vxCreateGaussian5x5Convolution(vx_context context)
{
vx_convolution conv = vxCreateConvolution(context, 5, 5);
vx_status status = vxWriteConvolutionCoefficients(conv, (vx_int16 *)gaussian5x5);
if (status != VX_SUCCESS)
{
vxReleaseConvolution(&conv);
return NULL;
}
status = vxSetConvolutionAttribute(conv, VX_CONVOLUTION_ATTRIBUTE_SCALE, (void *)&gaussian5x5scale, sizeof(vx_uint32));
if (status != VX_SUCCESS)
{
vxReleaseConvolution(&conv);
return NULL;
}
return conv;
}
vx_status example_conv(vx_context context)
{
//! [assign]
// A horizontal Scharr gradient operator with different scale.
vx_int16 gx[3][3] = {
{ 3, 0, -3},
{ 10, 0,-10},
{ 3, 0, -3},
};
vx_uint32 scale = 9;
vx_convolution scharr_x = vxCreateConvolution(context, 3, 3);
vxAccessConvolutionCoefficients(scharr_x, NULL);
vxCommitConvolutionCoefficients(scharr_x, (vx_int16*)gx);
vxSetConvolutionAttribute(scharr_x, VX_CONVOLUTION_ATTRIBUTE_SCALE, &scale, sizeof(scale));
//! [assign]
vxReleaseConvolution(&scharr_x);
return VX_SUCCESS;
}
static vx_status VX_CALLBACK vxHalfscaleGaussianInitializer(vx_node node, const vx_reference *parameters, vx_uint32 num)
{
vx_status status = VX_ERROR_INVALID_PARAMETERS;
if (num == 3)
{
vx_image input = (vx_image)parameters[0];
vx_image output = (vx_image)parameters[1];
vx_int32 kernel_size = 3;
vx_convolution convolution = 0;
vx_context context = vxGetContext((vx_reference)node);
vx_graph graph = vxCreateGraph(context);
if (vxGetStatus((vx_reference)graph) == VX_SUCCESS)
{
vx_uint32 i;
/* We have a child-graph; we want to make sure the parent
graph is recognized as a valid scope for sake of virtual
image parameters. */
graph->parentGraph = node->graph;
vxReadScalarValue((vx_scalar)parameters[2], &kernel_size);
if (kernel_size == 3 || kernel_size == 5)
{
if (kernel_size == 5)
{
convolution = vxCreateGaussian5x5Convolution(context);
}
if (kernel_size == 3 || convolution)
{
vx_image virt = vxCreateVirtualImage(graph, 0, 0, VX_DF_IMAGE_U8);
vx_node nodes[] = {
kernel_size == 3 ? vxGaussian3x3Node(graph, input, virt) : vxConvolveNode(graph, input, convolution, virt),
vxScaleImageNode(graph, virt, output, VX_INTERPOLATION_TYPE_NEAREST_NEIGHBOR),
};
vx_border_mode_t borders;
vxQueryNode(node, VX_NODE_ATTRIBUTE_BORDER_MODE, &borders, sizeof(borders));
for (i = 0; i < dimof(nodes); i++) {
vxSetNodeAttribute(nodes[i], VX_NODE_ATTRIBUTE_BORDER_MODE, &borders, sizeof(borders));
}
status = VX_SUCCESS;
status |= vxAddParameterToGraphByIndex(graph, nodes[0], 0); /* input image */
status |= vxAddParameterToGraphByIndex(graph, nodes[1], 1); /* output image */
status |= vxAddParameterToGraphByIndex(graph, node, 2); /* gradient size - refer to self to quiet sub-graph validator */
status |= vxVerifyGraph(graph);
/* release our references, the graph will hold it's own */
for (i = 0; i < dimof(nodes); i++) {
vxReleaseNode(&nodes[i]);
}
if (convolution) vxReleaseConvolution(&convolution);
vxReleaseImage(&virt);
status |= vxSetChildGraphOfNode(node, graph);
}
}
vxReleaseGraph(&graph);
}
}
return status;
}
