최소 단어 이상 선택하여야 합니다.
최대 10 단어까지만 선택 가능합니다.
다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
NTIS 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
DataON 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Edison 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0625111 (1996-03-29) |
발명자 / 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 | 피인용 횟수 : 307 인용 특허 : 7 |
A method for generating, substantially in real time, a user perceptible indication of the degree to which the distance between a handheld imaging device and a target object approximates the in-focus distance therebetween. A stored image of the target object is sampled, in accordance with a pattern o
A method for generating, substantially in real time, a user perceptible indication of the degree to which the distance between a handheld imaging device and a target object approximates the in-focus distance therebetween. A stored image of the target object is sampled, in accordance with a pattern of sampling addresses, to determine the magnitude of the slopes of the transitions of the stored image. The stored image is also sampled to determine the contrast value of the stored image. The highest magnitude slope values and the image contrast value are combined to produce a focus metric signal that is indicative of the degree to which the imaging device approximates an in-focus condition. The focus metric signal is then used to generate a user perceptible signal that can be utilized by an operator to move the imaging device toward its in-focus distance.
[ What is claimed is:] [1.] A method for determining the degree of focus in an optical reader of the type including an image sensor for generating an electrical signal including a plurality of data elements which together define an image of a target object projected thereon, a data memory for storin
[ What is claimed is:] [1.] A method for determining the degree of focus in an optical reader of the type including an image sensor for generating an electrical signal including a plurality of data elements which together define an image of a target object projected thereon, a data memory for storing the gray scale values of the data elements of said image in a suitable address space, and a control circuit for controlling said image sensor and said data memory, including the steps of:(a) selecting, from said address space, a set of sampling addresses for use in sampling said gray scale values;(b) determining, for a plurality of pairs of proximately located ones of said set of sampling addresses, the gray scale values stored at said pairs of sampling addresses;(c) deriving, from the gray scale values stored at said pairs of sampling addresses, a focus metric signal indicative of the sharpness of the image on said image sensor; and(d) using said focus metric signal to generate, substantially in real time, an output signal having a user perceptible property that varies in accordance with said focus metric signal.
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