Modulation transfer function MTF test chart card, test method of MTF and test device of MTF

Abstract

The invention discloses a modulation transfer function MTF test chart card, a test method of an MTF and a test device of the MTF. The MTF test chart card comprises at least one first test color block,at least one second test color block, at least one pure black test color block and at least one pure white test color block; the first test color block comprises black stripes and white stripes in alternative distribution along a horizontal direction, and the number of the black stripes is equal to the number of the white stripes; the second test color block comprises the black stripes and the white stripes in alternative distribution along a vertical direction, and the number of the black stripes is equal to the number of the white stripes; and distance from a center of the pure black test color block to the center of the MTF test chart card is equal to the distance from the center of the pure white test color block to the center of the MTF test chart card. Apparently, according to the MTF test chart card, the test method and the test device provided by the invention, when brightness of a display screen varies, difference between variation of a gray value of the black stripes and variation of the gray value of the white stripes is approximately equal to the difference between variation of the gray value of the black color block and variation of the gray value of the white block and is smaller, thus, a MTF value cannot vary with variation of the brightness of the display screen.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to a modulation transfer function MTF test chart card, an MTF test method and a device. Background technique [0002] The function of the modulation degree of lens imaging changing with the spatial frequency is called the modulation transfer function (Modulation Transfer Function, MTF). The MTF can be obtained by calculating the test chart and used to evaluate the clarity of the virtual reality device. [0003] In order to simulate the sharpness of the image actually observed by the user of the virtual reality device, such as figure 1 As shown, the lens 13 is fixed on the lens bracket 14, the other end of the lens bracket 14 is connected to the display screen 16, and the test chart card 15 is projected on the display screen 16; the image acquisition device 11 is installed on the carrying platform 12, and the image acquisition device 11 The test chart 15 on the display screen 16 is...

AI Technical Summary

Problems solved by technology

[0012] In order to solve the problem in the prior art that the change of the gray value of the display screen causes the change of the MTF value, which leads to the inability to accurately evaluate the definition of the virtual reality device, the present invention provides a modulation transfer function MTF test chart card, MTF Test method and device

Images