GB1257778A - - Google Patents

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Publication number
GB1257778A
GB1257778A GB1257778DA GB1257778A GB 1257778 A GB1257778 A GB 1257778A GB 1257778D A GB1257778D A GB 1257778DA GB 1257778 A GB1257778 A GB 1257778A
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United Kingdom
Prior art keywords
image
masks
s3
cosine
sine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
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Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed filed Critical
Priority to GB5577967 priority Critical
Publication of GB1257778A publication Critical patent/GB1257778A/en
Application status is Expired legal-status Critical

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/02Testing optical properties
    • G01M11/0292Testing optical properties of objectives by measuring the optical modulation transfer function

Abstract

1,257,778. Fourier analysis apparatus. NATIONAL RESEARCH DEVELOPMENT CORP. March 7, 1969 [Dec. 7, 1967], No. 55779/67. Heading G1A. [Also in Division G2] Fourier analysis apparatus for measuring the one-dimensional spatial frequency spectrum of an image produced for example in radioagraphy (using a fluorescent screen) or by means of a lens or other optical element or system to be tested, utilizes means to produce the sum of the squares of the sine and cosine transforms of the image. In the arrangement shown, a mirror tunnel formed by two parallel plane mirrors forms virtual images VI, of an image OI to be analysed. Lens L forms images in front of three spaced masks S1 S2, S3 behind each of which is positioned a photo-sensitive device such as a photo-multiplier P1, P2, P3. Masks S1 and S3 are of sinusoidally varying transmission or have a sinusoidal variation in transparent area against an opaque background, in one direction. These masks are displaced through 90 degrees relative to one another, and as a result the outputs of detectors P1 and P3 represent the sine and cosine transforms of the image. Mask S3 has a transmission characteristic whereby the mean luminance of the image is detected, which enables, the analyser to make band-pass rather than simply low-pass measurements and to generate a D. C. output signal facilitating processing. This mean luminance signal is subtracted from each of the transform signal in difference circuits 10, 11 and the difference signals squared and summed in circuit 12. In an alternative image duplication system, a prismatic beam-splitter or a large collimating lens and a number of smaller imaging lenses may replace mirror tunnel M1, M2. In another embodiment four masks are used, one pair containing alternate half cycles of sine wave and another pair, those of a cosine wave. The output signals of each pair are respectively subtracted to give the transform signals. The system can analyse any image including those formed by a scanning process. The bandwidth of the measurement can be varied as required, since it is related to the mask dimensions. When a dynamic image is analysed, a servo mechanism is used to maximize the output from the cosine transform filter.
GB1257778D 1967-12-07 1967-12-07 Expired GB1257778A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB5577967 1967-12-07

Publications (1)

Publication Number Publication Date
GB1257778A true GB1257778A (en) 1971-12-22

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ID=10474855

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1257778D Expired GB1257778A (en) 1967-12-07 1967-12-07

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GB (1) GB1257778A (en)
NL (1) NL6817476A (en)

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