Extracting Distance Using Gray Level Gradient On The Defocused Image

Moriyuki Matsuo

doi:10.1117/12.948461

16 December 1988 Extracting Distance Using Gray Level Gradient On The Defocused Image

Moriyuki Matsuo

Proceedings Volume 0974, Applications of Digital Image Processing XI; (1988) https://doi.org/10.1117/12.948461
Event: 32nd Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1988, San Diego, CA, United States

Abstract

This paper proposes a new method to extract distance between an object and a TV-camera from a defocussed image by using gray level gradient. In this work, image clearness is defined as a measure of the gray level gradient as a whole. The defocussed image is not clear in the sense that the clearness of the defocussed image is of a low value, compared with the focussed image. First, the image clearness of a defocused image is discussed from the view-point that image clearness is represented by changes of the gray level in the local image. Secondly, the linear and the nonlinear clearness of the image are defined as the mean of gray level gradient in the image. Finally, a satisfactory result is obtained, extracting distance between an object and a TV-camera using clearness.

Citation Download Citation

Moriyuki Matsuo "Extracting Distance Using Gray Level Gradient On The Defocused Image", Proc. SPIE 0974, Applications of Digital Image Processing XI, (16 December 1988); https://doi.org/10.1117/12.948461

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