Ophtalmologic apparatus

Claim 2

An apparatus according to claim 1, wherein said comparison/memory means comprises: first memory means which stores the threshold; comparison means for comparing the image information directly input from said image pickup means with the threshold memorized in said first memory means; and second memory means for, when said comparison means determines that the image information is larger than the threshold, memorizing the image information.

Claim 3

An apparatus according to claim 1, wherein said image pickup means comprises a plurality of pixels, and said comparison/memory means memorizes information associated with at least one pixel from which the image information larger than the threshold is obtained.

Claim 4

An apparatus according to claim 1, wherein said calculation means calculates a curvature of a cornea of the eye to be examined or an eye refracting power of the eye to be examined.

Claim 5

An ophthalmologic apparatus comprising: radiation means for radiating light onto an eye to be examined; image pickup means, having a plurality of pixels, for picking up an image of the eye to be examined, which is irradiated with light emitted from said radiation means; a frame memory for memorizing image data obtained from the pixels of said image pickup means; holding means for comparing luminance data of the image data obtained from the pixels of said image pickup means with a threshold determined in advance for the luminance data of the image data, and holding an address in said frame memory of the pixel from which image data having luminance data larger than the threshold is obtained; and calculation means for calculating a measured value of the eye to be examined on the basis of the address held in said holding means.

Claim 6

An ophthalmologic apparatus comprising: radiation means for radiating light onto an eye to be examined; image pickup means, having a plurality of pixels, for picking up an image of the eye to be examined, which is irradiated with light emitted from said radiation means; a frame memory for memorizing image data obtained from the pixels of said image pickup means; comparison means for comparing luminance data of the image data obtained from the pixels of said image pickup means with a threshold determined in advance for the luminance data simultaneously as said frame memory memorizes the image data; holding means for holding an address in said frame memory of the pixel from which image data having luminance data larger than the threshold is obtained on the basis of a comparison result of said comparison means, said holding means holding the address of at least one pixel having luminance data larger than the threshold; and calculation means for calculating a measured value of the eye to be examined on the basis of the address held in said holding means.

Claim 7

An apparatus according to claim 6, wherein said image pickup means picks up the image of the eye to be examined so as to obtain image data of bright points of the eye to be examined, which points are formed when the light emitted from said radiation means is reflected by at least one of a fundus or a cornea of the eye to be examined.

Claim 8

An ophthalmologic apparatus comprising: radiation means for radiating a plurality of light beams onto an eye to be examined; image pickup means, having a plurality of pixels, for picking up an image including bright points of the eye to be examined, which points are generated when the plurality of light beams are reflected by the eye to be examined; a frame memory for memorizing image data obtained from the pixels of said image pickup means; classification means for classifying the image data obtained from said image pickup means into a plurality of groups each including one bright point; memory means for memorizing thresholds determined in correspondence with the groups; holding means for comparing luminance data of the image data obtained from the pixels of said image pickup means with a corresponding one of the predetermined threshold, and holding an address in said frame memory of the pixel, from which image data having luminance data larger than the threshold is obtained, in units of groups classified by said classification means; and calculation means for calculating a measured value of the eye to be examined on the basis of the addresses held in said holding means.

Claim 9

An apparatus according to claim 8, wherein the image data having luminance data larger than the threshold is obtained from the pixel from which the image of the corresponding bright point is picked up, and said holding means holds the address of at least one pixel, from which the image of the corresponding bright point is picked up, in units of groups.

Claim 10

An apparatus according to claim 8, wherein said classification means comprises group information determination means for, when the image data is memorized in said frame memory, determining group information in the image data, and said holding means comprises control means for controlling to hold the addresses in units of groups in accordance with the group information.

Claim 11

An apparatus according to claim 8, wherein said calculation means calculates a square including the bright point on the basis of the address of the pixel stored in said holding means, and an arbitrary condition of said radiation means, reads out the calculated square from said frame memory, and calculates a centroid of the bright point, thereby calculating the measured value of the eye to be examined.

Claim 12

An ophthalmologic apparatus comprising: radiation means for radiating a light beam onto an eye to be examined; image pickup means, having a plurality of pixels, for picking up an image including bright points of the eye to be examined, which points are generated when the light beam is reflected by the eye to be examined; a frame memory for memorizing image data obtained from the pixels of said image pickup means; comparison means for comparing luminance data of image data obtained from the pixels of said image pickup means with a threshold determined in advance for the luminance data; assuring means for assuring an address in accordance with at least one pixel which is determined by said comparison means to have the luminance data larger than the threshold; bright point prediction/memory means for predicting and memorizing a size of the bright point generated by the light beam; pixel selection means for selecting the pixel near the address from said frame memory on the basis of the assured address and the size of the bright point memorized in said bright point prediction/memory means; extraction means for extracting the pixel having luminance data exceeding the threshold from the pixels selected by said pixel selection means; and calculation means for calculating a position of a centroid of the bright point on the basis of the pixel extracted by said extraction means so as to obtain a measured value of the eye to be examined.

Claim 13

An ophthalmologic apparatus comprising: radiation means for radiating light onto an eye to be examined; image pickup means, having a plurality of pixels, for picking up an image of the eye to be examined irradiated with light emitted from said radiation means; holding means for comparing luminance data of image data obtained from the pixels of said image pickup means with a threshold determined in advance for the luminance data of the image data, and holding position information of the pixel from which image data having luminance data larger than the threshold is obtained; and calculation means for calculating a measured value of the eye to be examined on the basis of the position information held by said holding means.

Claim 14

Optical apparatus for measuring a parameter of an eye, the apparatus comprising: means for providing an optical image of the eye; means for comparing a characteristic of respective parts of the image with a predetermined threshold value; means responsive to said comparing means for selecting a portion of the image which contains a part whose characteristic bears a predetermined relationship with said threshold value and other parts; and means for calculating said parameter based on the characteristics of the parts within said selected portion.