I am using opencv3.2 in Qt5.7. Here below are part of my codes:
for(int i=0;i<contour[0].size();i++)
{
if(contour[0][i].x>xmax) xmax = contour[0][i].x;
if(contour[0][i].x<xmin) xmin = contour[0][i].x;
if(contour[0][i].y>ymax) ymax = contour[0][i].y;
if(contour[0][i].y<ymin) ymin = contour[0][i].y;
}
int step = cvRound(contour[0].size()/16); #this line causes the error
The building error is:
error C2668: 'cvRound': ambiguous call to overloaded function
C:\opencv-3.2.0\mybuild\include\opencv2/core/fast_math.hpp(232): note: could be 'int cvRound(int)'
C:\opencv-3.2.0\mybuild\include\opencv2/core/fast_math.hpp(201): note: or 'int cvRound(float)'
C:\opencv-3.2.0\mybuild\include\opencv2/core/fast_math.hpp(93): note: or 'int cvRound(double)'
Anybody can help with the error?
Try to cast the parameters of the Round. You can write (float) in front of them. This way you help the compiler to find the correct Round function (the one that takes a float argument, for example)
I have solved the issue by changing:
int step = cvRound(contour[0].size()/16);
to:
int step = cvRound((double)contour[0].size()/16);
Related
Recently upgraded OpenCV from 3.4.5. to OpenCV 4.2.0.
Before I followed this stitching example: https://github.com/opencv/opencv/blob/5131619a1a4d1d3a860b5da431742cc6be945332/samples/cpp/stitching_detailed.cpp (particularly line 480). After upgrading, I altered the code to align more with this newer example: https://github.com/opencv/opencv/blob/master/samples/cpp/stitching_detailed.cpp (Note line 481).
Problem is with this new computeImageFeatures function, I am getting less detected features. Older code with same images gave me 1400+ features but computeImageFeatures gave me exactly 500 features per image. Any ideas how to "fix" this? I believe it also causes the "Bundle Adjuster" to fail later.
According to documentation of cv::ORB::create, default value of nfeatures argument is 500:
The first argument is nfeatures, you may set the first argument to grater number like 2000.
Here are the constructor arguments:
static Ptr<ORB> cv::ORB::create (int nfeatures = 500,
float scaleFactor = 1.2f,
int nlevels = 8,
int edgeThreshold = 31,
int firstLevel = 0,
int WTA_K = 2,
int scoreType = ORB::HARRIS_SCORE,
int patchSize = 31,
int fastThreshold = 20
)
Try modifying:
if (features_type == "orb")
{
finder = ORB::create();
}
to
if (features_type == "orb")
{
finder = ORB::create(2000);
}
In case you are not using ORB, but other type of features, read the documentation of the constructor.
I assume all types has a limiter argument.
I am trying to build call graphs using Clang AST.
Is there a way to somehow link the parameters of a function to the arguments of an inner function call?
For example, given the following function:
void chainedIncrement(int *ptr) {
simplePointerIncr(ptr);
for (int i=0;i<3;i++) {
simplePointerIncr(ptr);
}
}
I looking for a way to be able to link ptr from chainedIncrement function to the argument of simplePointerIncr function. Doing this will allow building a call graph.
Maybe there is a way of getting the same id while calling getId() on parameters and arguments.
I tried to use the following AST matcher:
functionDecl(hasDescendant(callExpr(callee(functionDecl().bind("calleeFunc")),unless(isExpansionInSystemHeader())).bind("callExpr");)).bind("outerFunc")
It seems that arguments are of type Expr while function parameters are of type ParmVarDecl.
Assuming that the parameter is passed as-is, without modification to an inner function, is there a way to link them somehow?
Thanks
UPDATE: Added my solution
There is a matcher called forEachArgumentWithParam(). It allows to bind arguments to a callee function to its parameters.
Another matcher, equalsBoundNode() allows to bind the parameters of the outer function, to the arguments of the callee function.
auto calleeArgVarDecl = declRefExpr(to(varDecl().bind("callerArg")));
auto innerCallExpr = callExpr(
forEachArgumentWithParam(calleeArgVarDecl, parmVarDecl().bind("calleeParam")),
callee(functionDecl().bind("calleeFunc")),unless(isExpansionInSystemHeader())).bind("callExpr");
auto fullMatcher = functionDecl(forEachDescendant(innerCallExpr),forEachDescendant(parmVarDecl(equalsBoundNode("callerArg")).bind("outerFuncParam"))).bind("outerFunc");
Here is a simplified example:
int add2(int var) {
return var+2;
}
int caller(int var) {
add2(var);
for (int i=0; i<3; i++) {
add2(var);
}
return var;
}
int main(int argc, const char **argv) {
int ret = 0;
caller(ret);
return 0;
}
use Clang-query to show the matcher result:
clang-query> match callExpr(hasAnyArgument(hasAncestor(functionDecl(hasName("caller")))))
Match #1:
~/main.cpp:5:3: note: "root" binds here
add2(var);
^~~~~~~~~
Match #2:
~/main.cpp:7:5: note: "root" binds here
add2(var);
^~~~~~~~~
2 matches.
It matches the function calls that use the parameter of function caller
There is a matcher called forEachArgumentWithParam(). It allows to bind arguments to a callee function to its parameters.
Another matcher, equalsBoundNode() allows to bind the parameters of the outer function, to the arguments of the callee function.
auto calleeArgVarDecl = declRefExpr(to(varDecl().bind("callerArg")));
auto innerCallExpr = callExpr(
forEachArgumentWithParam(calleeArgVarDecl, parmVarDecl().bind("calleeParam")),
callee(functionDecl().bind("calleeFunc")),unless(isExpansionInSystemHeader())).bind("callExpr");
auto fullMatcher = functionDecl(forEachDescendant(innerCallExpr),forEachDescendant(parmVarDecl(equalsBoundNode("callerArg")).bind("outerFuncParam"))).bind("outerFunc");
i am new with f# , will be great if some 1 can help , nearly half a day gone solving this problem Thank you
module Certificate =
type T = {
Id: int
IsECert: bool
IsPrintCert: bool
CertifiedBy: string
Categories: Category.T list
}
let createPending now toZonedDateTime toBeCertifiedByName (job: Models.Job.T) (certificateType: Models.CertificateType.T) (pendingCertificate: Models.PendingCertificate.T) visualization (categories: Category.T list) =
let forCompletion = Models.PendingCertificate.getCertificateForCompletion pendingCertificate
{
Id = forCompletion.Id |> CertificateId.toInt
IsECert = Models.PendingCertificate.isECertificate pendingCertificate
IsPrintCert = Models.PendingCertificate.isPrintCertificate pendingCertificate
CertifiedBy = toBeCertifiedByName
Categories = categories}
i am getting an error in "Incomplete structured construct at or before this point"
Your formatting is all off. I will assume here that this is just a result of posting to StackOverflow, and your actual code is well indented.
The error comes from the definition of createPending: this function does not have a result. All its body consists of defining a forCompletion value, but there is nothing after it. Here's a simpler example that has the same problem:
let f x =
let y = 5
This function will produce the same error, because it also doesn't have a result. In F#, every function has to return something. The body cannot contain only definitions of helper functions or values. For example, I could fix my broken function above like this:
let f x =
let y = 5
x + y
This function first defines a helper value y, then adds it to its argument x, and returns the result.
> f 2
> 7
>
> f 0
> 5
How exactly you need to fix your function depends on what exactly you want it to mean. I can't help you here, because you haven't provided that information.
assign wfwe = wb_acc & (adr_i == 2'b10) & ack_o & we_i;
For the above assign statement which is in verilog, i getting error while implememting it in z3
My code:
BitVecExpr[] wfwe = new BitVecExpr[1];
BitVecExpr[] wb_acc = new BitVecExpr[1];
BitVecExpr[] adr_i = new BitVecExpr[1];
BitVecExpr[] ack_o = new BitVecExpr[1];
BitVecExpr[] we_i = new BitVecExpr[1];
wfwe[0] = ctx.mkBVConst("wfwe",1);
wb_acc[0] = ctx.mkBVConst("wb_acc",1);
adr_i[0] = ctx.mkBVConst("adr_i",2);
ack_o[0] = ctx.mkBVConst("ack_o",1);
we_i[0] = ctx.mkBVConst("we_i",1);
Solver s = ctx.mkSolver();
s.add(ctx.mkBVAND(wb_acc[0],ctx.mkEq(adr_i[0],ctx.mkNumeral("2",2)),ack_o[0],we_i[0]));
I am getting error in above add statement:
error: method mkBVAND in class Context cannot be applied to given types;
required: BitVecExpr,BitVecExpr
found: BitVecExpr,BoolExpr
Which is true. Can anyone suggest me workaround. Am i implementing it incorrectly please let me know.
This error is reported because the second argument of mkBVAND is a Boolean expression (ctx.mkEq ...). Note that Booleans and BitVectors of size 1 are not the same thing, and they will not be converted automatically. The easiest way to convert between them is an if-then-else the selects the right values.
These are the problems with this example:
1) ctx.mkNumeral("2",2) is incorrect. I guess the intention was to create a bv-numeral of 2 bits with value 2; the easiest way to achieve that is ctx.mkBV(2, 2)
2) The 2nd argument of mkBVAND needs to be converted from Bool to BitVector, e.g., like so:
BoolExpr c = ctx.mkEq(adr_i[0], ctx.mkBV(2, 2));
BitVecExpr e = (BitVecExpr) ctx.mkITE(c, ctx.mkBV(1, 1), ctx.mkBV(0, 1));
e being the result.
3) ctx.mkBVAND takes exactly 2 arguments, no more and no less. Thus, the BVAND expression needs to be rewritten, e.g., like so:
ctx.mkBVAND(ctx.mkBVAND(wb_acc[0], e), ctx.mkBVAND(ack_o[0], we_i[0])))
4) The result needs to be converted to a Boolean expression again, e.g.
ctx.mkEq(q, ctx.mkBV(1, 1))
where q is the result of the BVAND.
labelGen.text = [self, arc4random() % 1000]
give's me error => "Could not find an overload for '%' that accepts the supplied arguments"
Help me please
Though its not clear what you want to achieve, I think you want a random number as a string. You can get it as below.
NSUInteger random = arc4random()%1000;
labelGen.text = [NSString stringWithFormat:#"%d",random];
In you code,
labelGen.text = [self, arc4random() % 1000]
the arc4random() function is c function not Objective-C function, show you can not call it on self. Also this expression will give you unsigned int value not a NSString value.