Error: Edge function: variable might be used before it is defined

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Kjell
Kjell 2023-7-1
评论： Kjell 2023-7-2
Hi,
I want to use the edge function and I keep getting an error if I use it inside a function.
Unrecognized function or variable 'edge'.
Error in detectEdge (line 6)
bscan = edge(bscan, 'Canny', canny_threshold);
Error in BugFixingFunctions (line 32)
img = detectEdge(img);
Here is my Code:
function [bscanout] = detectEdge(bscan)
% segment edge
canny_threshold = [0.1, 0.2]; % Anpassen der Schwellenwerte für die Kantenextraktion
bscan = edge(bscan, 'Canny', canny_threshold);
[rows, columns] = size(bscan);
% delete Isle
bscan = bwareaopen(bscan, 150);
temp = zeros(rows,columns);
for i = 1:columns
for j = 1:rows
if bscan(j,i) == 1
temp(j,i) = 1;
break;
end
end
end
temp(350:end,:) = 0;
temp(1:100,:) = 0;
% Interpolate edge Without high peaks
bscanout = temp;
[yValues, xValues] = find(temp);
clear temp;
%if gap is at the start
if xValues(1) ~= 1 && xValues(1) ~= 2
xValues = [1; 2; xValues];
yValues = [yValues(end-4); yValues(end-4); yValues];
elseif xValues(1) ~= 1 && xValues(1) == 2
xValues = [1; xValues];
yValues = [yValues(end-4); yValues];
end
%if gap is at the end
if xValues(end) ~= columns && xValues(end) ~= columns -1
xValues = [xValues; columns - 1; columns];
yValues = [yValues; yValues(3); yValues(3)];
elseif xValues(end) ~= columns && xValues(end) == columns -1
xValues = [xValues; columns];
yValues = [yValues; yValues(3)];
end
%interpolate edge for the missing gap
for i = 1:length(xValues) - 1
if xValues(i) + 1 ~= xValues(i + 1)
edge = interp1(xValues(i-1:i + 1),yValues(i-1:i + 1),1:columns,"pchip");
edge = round(edge);
for j = xValues(i):xValues(i+1)
bscanout(edge(j),j) = 1;
end
end
end
end
If I use the edge function outside the function I wrote, I dont get this error

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采纳的回答

DGM
DGM 2023-7-1
I'm pretty sure the reason that's happening is because later on in the same scope, you're shadowing the function by creating a variable with the same name. The linter assumes that edge is supposed to be a variable, when you're treating it as both. Avoid creating variables that have the same name as functions. If you rename your edge variable, the warning should go away.

更多回答（1 个）

Image Analyst
Image Analyst 2023-7-2
Try this:
edgeData = interp1(xValues(i-1:i + 1),yValues(i-1:i + 1),1:columns,"pchip");
edgeData = round(edgeData);
for j = xValues(i):xValues(i+1)
bscanout(edgeData(j),j) = 1;
end

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