Hi, thanks a lot for your great work I am having an issue with the c

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Wrong Sift points coordinates about cudasift HOT 5 OPEN

omaraltayyan commented on September 4, 2024

Wrong Sift points coordinates

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Comments (5)

omaraltayyan commented on September 4, 2024

@Celebrandil can you please take some of your time to answer, sorry to insist but i gotta use this in my school project which is only a few weeks away

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Celebrandil commented on September 4, 2024

Do you have an image illustrating the problem? SIFT features are often found in the weirdest of places.

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omaraltayyan commented on September 4, 2024

@Celebrandil
here is a video i made to illustrate the problem:

https://youtu.be/ine41zFnmpk

this is the code used for drawing

image.convertTo(image, CV_8UC1);
for (int i = 0; i < imageSiftData.numPts; i++)
{
	SiftPoint siftPoint = imageSiftData.h_data[i];
	Point2f pointToDraw(siftPoint.xpos, siftPoint.ypos);

	cv::circle(image, pointToDraw, 3, Scalar(0, 0, 0), 2);
}

and this is the keypoint detection code:

	image.convertTo(convertedImage, CV_32FC1);
        image = convertedImage;
	CudaImage cudaImage;
	unsigned int imageWidth = image.cols;
	unsigned int imageHeight = image.rows;


	cudaImage.Allocate(imageWidth, imageHeight, iAlignUp(imageWidth, 128), false, NULL, (float*)image.data);
	cudaImage.Download();

	// Extract Sift features from image
	SiftData imageSiftData;
	float initBlur = 1.0f;
	float thresh = 1.0f;
	InitSiftData(imageSiftData, 4096, true, true);

	ExtractSift(imageSiftData, cudaImage, 5, initBlur, thresh, 0.0f, false);

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Celebrandil commented on September 4, 2024

I fail to see what the problem might be. It indeed looks like as if the coordinates are scaled up by a factor of two.

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