Automated left ventricle (LV) boundary delineation from contrast ventriculograms has been studied... more Automated left ventricle (LV) boundary delineation from contrast ventriculograms has been studied for decades. Unfortunately, no accurate methods h ave ever been reported. A new knowledge based multi-stage method to automatically delineate the LV boundary at end diastole and end systole is discussed in this paper. It has a mean absolute boundary error of about Zmm and an associated ejection
Computer Vision, Graphics, and Image Processing, 1986
... J non-empty and bounded implies (q } = Jq a J. Since S = Jq, we have (q) = S s J.376 ZHUANG A... more ... J non-empty and bounded implies (q } = Jq a J. Since S = Jq, we have (q) = S s J.376 ZHUANG AND ... EDJ'N, since dilation is commutative. ... In the morphology case, a large structuring element isgiven and a morphological erosion or dilation must be performed with it on hardware ...
[1992] Proceedings of the IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis, 1992
ABSTRACT A method for estimating 2D image sequences using the generalized time-frequency represen... more ABSTRACT A method for estimating 2D image sequences using the generalized time-frequency representation (GTFR) is presented. The performance characterization is based on 20000 simulated noisy images. The results show that even with a signal to noise ratio (SNR) of 5 db, rectangular objects of at least 4 pixels in length and width can be detected, to within 2.5 pixel location accuracy. The misdetection rate is near zero, and the average false detection rate is 0.06 false objects per frame of 64Ă—64 size in a 5 db SNR environment. With -1 db SNR, objects can be detected within 5 pixel accuracy. The misdetection rate for this case is near zero and the average false detection rate is 1.6 false objects per frame of 64Ă—64 size. The method is also applied to an image sequence obtained from a 747 takeoff scene. The 747 takeoff speed was predicted to be 142 kts, which is well within the typical range of 140 to 150 kts
ICASSP '84. IEEE International Conference on Acoustics, Speech, and Signal Processing, 1984
ABSTRACT A new algorithm is developed for solving the maximum entropy (ME) image reconstruction p... more ABSTRACT A new algorithm is developed for solving the maximum entropy (ME) image reconstruction problem. This approach involves solving a system of ordinary differential equations with appropriate initial conditions which can be computed easily. Instead of searching in the n+1-dimensional space as required for most ME algorithms, our approach involves solving a 1-dimensional search problem along a well-defined path. Moreover an efficient algorithm is developed to handle this search.
This paper describes a protocol for systematically evaluating the performance of dashed-line dete... more This paper describes a protocol for systematically evaluating the performance of dashed-line detection algorithms. It includes a test image generator which creates random line patterns subject to prespecified constraints. The generator also outputs ground truth data for each line in the image. The output of the dashed line detection algorithm is then compared to these ground truths and evaluated using a set of criteria.
Proceedings of 2nd International Conference on Document Analysis and Recognition (ICDAR '93), 1993
Two sources of document degradation are modeled: i) perspective distortion that occurs while phot... more Two sources of document degradation are modeled: i) perspective distortion that occurs while photocopying or scanning thick, bound documents, and ii) degradation due to perturbations in the optical scanning and digitization process: speckle, blurr, jitter, thresholding. Perspective distortion is modeled by studying the underlying perspective geometry of the optical system of photocopiers and scanners. An illumination model is described to account for the nonlinear intensity change occuring across a page in a perspective-distorted document. The optical distortion process is modeled morphologically. First, a distance transform on the foreground is performed, followed by a random inversion of binary pixels where the probability of flip is a function of the distance of the pixel to the boundary of the foreground. Correlating the flipped pixels is modeled by a morphological closing operation
Proceedings IEEE International Symposium on Bio-Informatics and Biomedical Engineering, 2000
Automated left ventricle (LV) boundary delineation from left ventriculograms has been studied for... more Automated left ventricle (LV) boundary delineation from left ventriculograms has been studied for decades. Unfortunately, no methods in terms of the accuracy about volume and ejection fraction have ever been reported. A new knowledge based multi-stage method to automatically delineate the LV boundary at end diastole and end systole is discussed in this paper: It has a mean absolute boundary
version (from foreground to background and vice- versa) that occurs independently at each pixel S... more version (from foreground to background and vice- versa) that occurs independently at each pixel Scanned documents are noisy. Recently, (KHP93, due to light intensity fluctuations and threshold- KHP94, BaiSO), document degradation models were ing level, and (ii) the blurring that occurs due to proposed that model the local distortion introduced the point-spread function of the optical system the during the
Proceedings of Sixth International Conference on Document Analysis and Recognition, 2001
... The following parts describe the automatic table ground truth generation procedure. ... softw... more ... The following parts describe the automatic table ground truth generation procedure. ... software [ 101 con-verts DVI file to a TIFF(Tagged Image File Format) file and a so-called character ground truth file which contains the bounding box coordinates, the type and size of ...
Automated left ventricle (LV) boundary delineation from contrast ventriculograms has been studied... more Automated left ventricle (LV) boundary delineation from contrast ventriculograms has been studied for decades. Unfortunately, no accurate methods h ave ever been reported. A new knowledge based multi-stage method to automatically delineate the LV boundary at end diastole and end systole is discussed in this paper. It has a mean absolute boundary error of about Zmm and an associated ejection
Computer Vision, Graphics, and Image Processing, 1986
... J non-empty and bounded implies (q } = Jq a J. Since S = Jq, we have (q) = S s J.376 ZHUANG A... more ... J non-empty and bounded implies (q } = Jq a J. Since S = Jq, we have (q) = S s J.376 ZHUANG AND ... EDJ'N, since dilation is commutative. ... In the morphology case, a large structuring element isgiven and a morphological erosion or dilation must be performed with it on hardware ...
[1992] Proceedings of the IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis, 1992
ABSTRACT A method for estimating 2D image sequences using the generalized time-frequency represen... more ABSTRACT A method for estimating 2D image sequences using the generalized time-frequency representation (GTFR) is presented. The performance characterization is based on 20000 simulated noisy images. The results show that even with a signal to noise ratio (SNR) of 5 db, rectangular objects of at least 4 pixels in length and width can be detected, to within 2.5 pixel location accuracy. The misdetection rate is near zero, and the average false detection rate is 0.06 false objects per frame of 64Ă—64 size in a 5 db SNR environment. With -1 db SNR, objects can be detected within 5 pixel accuracy. The misdetection rate for this case is near zero and the average false detection rate is 1.6 false objects per frame of 64Ă—64 size. The method is also applied to an image sequence obtained from a 747 takeoff scene. The 747 takeoff speed was predicted to be 142 kts, which is well within the typical range of 140 to 150 kts
ICASSP '84. IEEE International Conference on Acoustics, Speech, and Signal Processing, 1984
ABSTRACT A new algorithm is developed for solving the maximum entropy (ME) image reconstruction p... more ABSTRACT A new algorithm is developed for solving the maximum entropy (ME) image reconstruction problem. This approach involves solving a system of ordinary differential equations with appropriate initial conditions which can be computed easily. Instead of searching in the n+1-dimensional space as required for most ME algorithms, our approach involves solving a 1-dimensional search problem along a well-defined path. Moreover an efficient algorithm is developed to handle this search.
This paper describes a protocol for systematically evaluating the performance of dashed-line dete... more This paper describes a protocol for systematically evaluating the performance of dashed-line detection algorithms. It includes a test image generator which creates random line patterns subject to prespecified constraints. The generator also outputs ground truth data for each line in the image. The output of the dashed line detection algorithm is then compared to these ground truths and evaluated using a set of criteria.
Proceedings of 2nd International Conference on Document Analysis and Recognition (ICDAR '93), 1993
Two sources of document degradation are modeled: i) perspective distortion that occurs while phot... more Two sources of document degradation are modeled: i) perspective distortion that occurs while photocopying or scanning thick, bound documents, and ii) degradation due to perturbations in the optical scanning and digitization process: speckle, blurr, jitter, thresholding. Perspective distortion is modeled by studying the underlying perspective geometry of the optical system of photocopiers and scanners. An illumination model is described to account for the nonlinear intensity change occuring across a page in a perspective-distorted document. The optical distortion process is modeled morphologically. First, a distance transform on the foreground is performed, followed by a random inversion of binary pixels where the probability of flip is a function of the distance of the pixel to the boundary of the foreground. Correlating the flipped pixels is modeled by a morphological closing operation
Proceedings IEEE International Symposium on Bio-Informatics and Biomedical Engineering, 2000
Automated left ventricle (LV) boundary delineation from left ventriculograms has been studied for... more Automated left ventricle (LV) boundary delineation from left ventriculograms has been studied for decades. Unfortunately, no methods in terms of the accuracy about volume and ejection fraction have ever been reported. A new knowledge based multi-stage method to automatically delineate the LV boundary at end diastole and end systole is discussed in this paper: It has a mean absolute boundary
version (from foreground to background and vice- versa) that occurs independently at each pixel S... more version (from foreground to background and vice- versa) that occurs independently at each pixel Scanned documents are noisy. Recently, (KHP93, due to light intensity fluctuations and threshold- KHP94, BaiSO), document degradation models were ing level, and (ii) the blurring that occurs due to proposed that model the local distortion introduced the point-spread function of the optical system the during the
Proceedings of Sixth International Conference on Document Analysis and Recognition, 2001
... The following parts describe the automatic table ground truth generation procedure. ... softw... more ... The following parts describe the automatic table ground truth generation procedure. ... software [ 101 con-verts DVI file to a TIFF(Tagged Image File Format) file and a so-called character ground truth file which contains the bounding box coordinates, the type and size of ...
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Papers by Robert Haralick