Evaluation method for perpendicularity of image sensor light-sensitive surface and optical axis and optical test card

An image sensor and optical testing technology, which is applied in the field of cameras, can solve the problems that the photosensitive surface of the image sensor is not perpendicular to the optical axis, cannot be displayed, and affects the image quality, etc., so as to improve the accuracy of the test and liberate the labor force

Active Publication Date: 2016-07-27
GUANGDONG VIMICRO
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Problems solved by technology

However, in actual production, due to the limitations of machining accuracy and installation errors, the photosensitive surface of the image sensor may not be perpendicular to the optical axis,

Method used

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  • Evaluation method for perpendicularity of image sensor light-sensitive surface and optical axis and optical test card
  • Evaluation method for perpendicularity of image sensor light-sensitive surface and optical axis and optical test card
  • Evaluation method for perpendicularity of image sensor light-sensitive surface and optical axis and optical test card

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[0013] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0014] figure 1 Shown is a flowchart of a method for evaluating the perpendicularity between the photosensitive surface of the image sensor and the optical axis according to an embodiment of the present invention. As can be seen from the figure, the method includes:

[0015] Step 101: Collect N frames of images of the test card in the process of one rotation of the camera lens focus ring. If it is a manual focus lens, you need to rotate the lens ...

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Abstract

The invention discloses an evaluation method for the perpendicularity of an image sensor light-sensitive surface and an optical axis and an optical test card, used for quantitatively calibrating the perpendicularity of the image sensor light-sensitive surface and the optical axis. The evaluation method comprises the steps of collecting N frames of images of the test card during a process that a focusing ring of a camera lens rotates a circle; according to a preset coordinate system, respectively extracting target areas from at least three same positions of the N frames of images; respectively computing a boundary information value of each target area in each frame of image; and computing the perpendicularity of the image sensor light-sensitive surface and the optical axis according to the boundary information values.

Description

technical field [0001] The invention relates to the technical field of cameras, in particular to a method for evaluating the perpendicularity between a photosensitive surface of an image sensor and an optical axis and an optical test card. Background technique [0002] For an ideal optical imaging system, the photosensitive surface of the image sensor should be perpendicular to the optical axis, so that through the focusing of the camera lens, when the photosensitive surface of the image sensor is on the focal plane of the image side, a completely clear image can be presented. However, in actual production, due to the limitations of machining accuracy and installation errors, the photosensitive surface of the image sensor may not be perpendicular to the optical axis, so that the photosensitive surface of the image sensor cannot be completely on the focal plane of the image square, and it cannot be presented. A perfectly sharp image, compromising image quality. Contents of ...

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Application Information

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IPC IPC(8): H04N17/00
CPCH04N17/002
Inventor 王美荣汪源
Owner GUANGDONG VIMICRO
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