IMAGE SIGNAL ACQUISITION METHOD AND IMAGE SIGNAL ACQUISITION DEVICE

摘要

A method of acquiring image signal and an image signal acquisition device are proposed. The method includes steps: measuring brightness signals of gray-scale switched images in a sample gray scale, and nonlinear interpolating the brightness signals of the gray-scale switched images in the sample gray scale to acquire brightness signals of full gray-scale switched images. The nonlinear interpolating is cubic spline interpolating. the image signal acquisition method and the image signal acquisition device in the present invention nonlinear interpolates brightness signals of gray-scale switched images in sample gray scale to acquire brightness signals of full gray-scale switched images, and thus it efficiently acquires brightness signals of switched images in different gray scales.

主权项

1. A method of acquiring image signal, comprising steps:
measuring brightness signals of gray-scale switched images in a sample gray scale; and nonlinear interpolating the brightness signals of the gray-scale switched images in the sample gray scale to acquire brightness signals of full gray-scale switched images; wherein the nonlinear interpolating is cubic spline interpolating; wherein the step of cubic spline interpolating comprises: constructing a sample brightness signal matrix according to the gray-scale images of the sample gray scale before switching, that of the sample gray scale after switching and the brightness signals of the gray-scale switched images of the sample gray scale; and 2D interpolating the sample brightness signal matrix by calling interp2 interpolation function to adopt cubic spline interpolation for generating brightness signals of 2D full-gray scale switched images; wherein when performing 2D interpolating, it sets up boundary condition of the interpolation as a third derivative of boundary endpoint identical to that of neighbor points of the boundary endpoints.