Modern thermal sensor upgrade for existing missile system
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IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F41G-007/20
F41G-007/32
G06T-003/40
출원번호
US-0413786
(2003-04-15)
발명자
/ 주소
Wells,Michael L.
출원인 / 주소
Raytheon Company
대리인 / 주소
Renner, Otto, Boisselle &
인용정보
피인용 횟수 :
1인용 특허 :
16
초록▼
A method of mapping a first array to a second array is useful where (1) each of the arrays has pixels in sequential columns and rows and the first array has sequential integers identifying each row of pixels, (2) sequential integers identify each column of pixels, and a numerical value is associated
A method of mapping a first array to a second array is useful where (1) each of the arrays has pixels in sequential columns and rows and the first array has sequential integers identifying each row of pixels, (2) sequential integers identify each column of pixels, and a numerical value is associated with each pixel, (3) the first and second arrays have (or can be made to have) a one to one pairing between columns of the first and second arrays, and (4) groups of four unique pixels in the same column of the first array are paired one to one with a pixel in the paired column of the second array. The method includes the steps of, for each column in the first array, selecting the values associated with the pixels in four sequential odd numbered rows to form an odd group of four unique pixels, combining the values associated with the pixels in the first three odd numbered rows of the odd group to form an odd combined value, and mapping the odd combined value to the pixel in the column and row of the second array with which the odd group is paired, and thereafter selecting the values associated with the pixels in four even numbered rows to form an even group of four unique pixels, combining the values associated with pixels in the last three rows of the even group to form an even combined value, and mapping the even combined value to the pixel in column and row of the second array with which the even group is paired.
대표청구항▼
What is claimed is: 1. A method of mapping a first array to a second array, each of the arrays having pixels in sequential columns and rows, the first array having sequential integers identifying each row of pixels, sequential integers identifying each column of pixels, a numerical value associated
What is claimed is: 1. A method of mapping a first array to a second array, each of the arrays having pixels in sequential columns and rows, the first array having sequential integers identifying each row of pixels, sequential integers identifying each column of pixels, a numerical value associated with each pixel, the first and second arrays having a one to one pairing between columns of the first and second arrays and groups of four unique pixels in the same column of the first array that are paired one to one with a pixel in the paired column of the second array, the method including the steps of for each column in the first array, selecting the values associated with the pixels in four sequential odd numbered rows to form an odd group of four unique pixels, combining the values associated with the pixels in the first three odd numbered rows of the odd group to form an odd combined value, and mapping the odd combined value to the pixel in the column and row of the second array with which the odd group is paired, selecting the values associated with the pixels in four even numbered rows to form an even group of four unique pixels, combining the values associated with pixels in the last three rows of the even group to form an even combined value, and mapping the even combined value to the pixel in column and row of the second array with which the even group is paired. 2. The method of claim 1 including repeating the selecting and combining steps of claim 1 for each odd group in the first array and for each even group in the first array, mapping the odd combined value of each odd group to the pixel in the column and row of the second array with which the odd group is paired, and mapping the even combined value of each even group to the pixel in the column and row of the second array with which the even group is paired. 3. The method of claim 2 in which the steps of selecting, combining, and mapping for one of the odd and even numbered groups is performed and thereafter performing the steps of selecting, combining, and mapping of the other of the odd and even numbered groups. 4. The method of claim 1 wherein the pixels of the first array are populated by values from a sensor. 5. The method of claim 1 wherein the pixels of the first array are populated by values from an infra red sensor. 6. A missile tracking system comprising, an infra red sensor having pixels in a first array, said first array being rectangular and populated by values representing the thermal image of a scene; a tracker having hardware and software to receive its input in the form of a second array, the second array being rectangular and having fewer pixels than that of the first array; and means for mapping an area of the first array to the second array by corresponding a plurality of adjacent pixels in the area to each pixel in the second array in such a manner that certain pixels in the area are ignored but no two sequential pixels in the area are ignored. 7. A missile tracking system as set forth in claim 6, wherein the adjacent pixels are sequential pixels in one dimension of the first array. 8. A missile tracking system as set forth in claim 7, wherein the first array has m columns and n rows, wherein the second array has s columns and t rows, wherein the rows correspond to the one dimension whereby n is greater than t, and wherein the area mapped from the first array comprises s sequential columns and n sequential rows. 9. A missile tracking system as set forth in claim 8, wherein m is greater than s. 10. A missile tracking system as set forth in claim 8, wherein the second array has 480 columns and 120 rows, whereby the area mapped from the first array comprises 480 sequential columns and n sequential rows. 11. A missile tracking system as set forth in claim 10, wherein the first array has 640 columns and 480 rows, whereby the area mapped from the first array comprises 480 sequential columns and 480 rows. 12. A missile tracking system comprising: an infra red sensor having pixels in a first array, said first array being rectangular and populated by values representing the thermal image of a scene; a tracker having hardware and software to receive its input in the form of a second array, the second array being rectangular and having fewer pixels that the first array; and means for mapping the pixels of the first array to the second array; wherein the first and second arrays have pixels in sequential columns and rows, the first array having sequential integers identifying each row of pixels, sequential integers identifying each column of pixels, a numerical value associated with each pixel, the first and second arrays having a one to one pairing between columns of the first and second arrays and groups of four unique pixels in the same column of the first array that are paired one to one with a single pixel in the paired column of the second array, and wherein the means for mapping the pixels of the first array to the second array includes for each column in the first array, means for selecting the values associated with the pixels in four sequential odd numbered rows to form an odd group of four unique pixels, means for combining the values associated with the pixels in the first three odd numbered rows of the odd group to form an odd combined value, and means for mapping the odd combined value to the pixel in the column and row of the second array with which the odd group is paired, and means selecting the values associated with the pixels in four even numbered rows to form an even group of four unique pixels. 13. A method of mapping a larger array of values to a smaller array of values, the larger array having m columns and n rows, the smaller array having s columns and t rows where t is an even number, the method comprising the steps of selecting s columns from the first array and disregarding all values in the columns of the first array other than those in the selected s columns, determining the largest number, p, of rows in the larger array where p/t is an integer and p<n, selecting p adjacent rows of the larger array and disregarding the values in rows of the larger array other than those in the selected p rows, separating the p rows into odd numbered rows and even numbered rows, separating the t rows of the smaller array into odd numbered rows and even numbered rows, for each column of the larger array, grouping the values in sequential odd numbered rows into t/2 odd groups, and grouping the values in sequential even numbered rows into t/2 even groups, each group having p/t values in it, selecting the values in q sequentially numbered rows in each even group and in each odd group, where q<p/t, combining the selected values in each group to form a combined odd value and a combined even value, respectively, for each odd group and each even group, for each column mapping in sequence the combined odd value for the group including row 1 of the larger array to row 1 of the smaller array, and for each successive combined odd value to the successive odd numbered row of the smaller array, and for each column mapping in sequence the combined even value for the group including row 2 of the larger array to row 2 of the smaller array, and for each successive combined even value to the successive even numbered row of the smaller array. 14. The method of claim 13 wherein the number q is selected to achieve a desired resolution in the mapping of the larger array to the smaller array. 15. The method of claim 14 wherein the mapping step includes alternately mapping all the combined odd values and all the combined even values to the smaller array. 16. A method of tracking a missile, said method comprising the steps of: generating a first array of pixels representative of a thermal image of a scene relevant to the tracking of the missile; mapping an area of the first array to a second array having fewer pixels than the area of the first array by corresponding a plurality of adjacent pixels in the area of the first array to each pixel in the second array in such a manner that certain pixels in the area are ignored but no two sequential pixels in the area are ignored; and using the second array to detect the position of the missile. 17. A method as set forth in claim 16, further comprising the step of sending signals based on the second array to the missile to control its direction of travel. 18. A method as set forth in claim 16, wherein the adjacent pixels are sequential pixels in one dimension of the first array. 19. A method as set forth in claim 18, wherein the first array has m columns and n rows, wherein the second array has s columns and t rows, wherein the rows correspond to the one dimension whereby n is greater than t, and wherein the area of the first array comprises s sequential columns and n sequential rows. 20. A method as set forth in claim 19, wherein m is greater than s. 21. A method as set forth in claim 20, wherein the second array has 480 columns and 120 rows, whereby the area of the first array comprises 480 sequential columns and n sequential rows. 22. A method as set forth in claim 21, wherein the first array has 640 columns and 480 rows, whereby the area of the first array comprises 480 sequential columns and 480 rows.
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이 특허에 인용된 특허 (16)
Naqvi H. Shahzad, Apparatus and method for performing fast and precise spatial transformations of images.
Nishikubo Sam S. ; Nagareda Jon J. ; Jones Christopher S., Histogram chip for line summing, line grabbing and histogramming in a thermal imaging system.
Fu Chi-Yung (San Francisco CA) Petrich Loren I. (Livermore CA), Image compression/decompression based on mathematical transform, reduction/expansion, and image sharpening.
Sand Richard J. (Torrance CA) Gaskell George L. (East Manhattan Beach CA) Wells Michael L. (Newhall CA), Missile tracking system with a thermal track link.
Hobson Gregory L. (St. Peters MO) Luetkemeyer Kent (Maryland Heights MO) Wootton John R. (St. Louis MO), Missile tracking, guidance and control apparatus.
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