Resolution test chart and resolution test method of ultra-wide angle lens

Abstract

The present invention discloses a resolution test chart and a resolution test method of an ultra-wide angle lens. The resolution test chart comprises a spherical cover, an opening being formed at the lower end of the spherical cover; the inner surface of the spherical cover is provided with a plurality of horizontal test stripes and a plurality of vertical test stripes; the horizontal test stripes extend along the horizontal direction of the spherical cover and are distributed from the apex of the spherical cover to the opening; the projections of the horizontal test stripes in a horizontal plane are concentric annuluses; the vertical test stripes are distributed along the vertical direction of the spherical cover and extend from one side of the opening, pass through the top of the spherical cover and extend to the opposite side of the opening, so that second test regions which are centrally distributed at the inner surface of the spherical cover can be formed; and the projections of the vertical test stripes in the horizontal plane are straight stripes which are parallel to each other. With the resolution test chart adopted, the size of a test chart required by the measurement of the resolution of the ultra-wide angle lens can be decreased, the basic patterns of stripes in an obtained test image can be basically constant when the resolution of a large-distortion lens is tested, and test accuracy can be improved.

Description

technical field [0001] The invention relates to the field of test chart design, in particular to a resolution test chart and a resolution test method for an ultra-wide-angle lens. Background technique [0002] At present, the commonly used resolution test charts are ISO12233 charts and SFR (Spatial Frequency Response, spatial frequency response) charts, refer to Figure 1a and Figure 1b shown, where Figure 1a A schematic diagram of the ISO12233 chart, Figure 1b It is a schematic diagram of the SFR chart. [0003] The conventional resolution test method is, the Figure 1a ISO12233 chart card in or Figure 1b The SFR chart in the card is pasted on the flat panel, refer to figure 2 , place the camera at a certain distance from the plane panel, use the camera to shoot the picture card on the plane panel, and then use various algorithms to analyze the photos and calculate the resolution of the camera lens. [0004] However, both of the above two charts are suitable for ca...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a resolution test chart and a resolution test method of an ultra-wide-angle lens to solve the problem that the existing test chart is used to test the ultra-wide-angle lens, the test environment is difficult to build, and the obtained test image is severely deformed due to large lens distortion. , the problem that affects the accuracy of test results

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