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Digital image analysis test pattern and its making method

A production method and test chart technology, which can be used in image communication, television, optics, etc., and can solve problems such as inconvenience and inability to change test charts.

Inactive Publication Date: 2006-05-10
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the test pattern cannot be changed with different lenses and different object distances. If the same test pattern is used for testing multiple lenses and image sensors, the object distance needs to be adjusted frequently, which is very inconvenient

Method used

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  • Digital image analysis test pattern and its making method
  • Digital image analysis test pattern and its making method
  • Digital image analysis test pattern and its making method

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Embodiment Construction

[0017] The image sensor in the first embodiment of the present invention has 350,000 pixels, the focal length of the lens is 4 mm, and the object distance is 600 mm. To test the quality of the imaging system, a resolution test chart needs to be produced.

[0018] The frame size of the digital image resolution test chart of the present invention is determined according to the focal length of the lens and the size of the image sensor. According to the lens imaging formula:

[0019] 1 / object distance+1 / image distance=1 / lens focal length and magnification=image distance / object distance

[0020] Then the magnification ratio of the image sensor imaging system is 6.711*10 -3 . It is known that the effective area of ​​the image sensor is 3.6mm*2.7mm, and the diagonal length is 4.5mm. The size of the frame is 536.4mm*402.3mm, which is rectangular, and its diagonal is 670.5mm long. The half-diagonal length of 335.25mm is the full field of view that the lens can see. T...

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Abstract

This invention relates to digital image analysis test pattern and its process method, wherein the pattern comprises multiple section analysis patterns with each one composed of four sections with tw2o in vertical direction at certain angle and with other two in level direction at certain angle. The process method comprises the following steps: providing one lens and one image sensor to compute the amplifying rate of the imaging system; through the sensor analysis and amplifying rate to compute the section analysis relative position; putting the analysis pattern on the multiple visual fields.

Description

【Technical field】 [0001] The present invention relates to a resolution test chart and a manufacturing method thereof, in particular to a digital image resolution test chart and a manufacturing method thereof. 【Background technique】 [0002] At present, digital cameras have been widely used by people, especially in recent years portable electronic devices such as mobile phones and PDAs (Personal Digital Assistants, personal digital assistants) are also rapidly developing towards high performance and multifunctional directions. Digital cameras and portable electronic devices The combination of has become the key to the development of mobile multimedia technology. With the continuous development of digital technology, digital cameras and portable electronic devices with built-in digital cameras are becoming smaller and lighter, and manufacturers are also striving to improve their resolution. Resolution is an important parameter of digital cameras, and strictly testing this par...

Claims

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Application Information

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IPC IPC(8): H04N17/00G02B26/10
Inventor 孙文信
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD
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