c# - HoughLinesP参数!单元？

Question

我正在使用 OpenCV 2.4.2

这是 OpenCV 文档中的引文

C++: void HoughLinesP(InputArray image, OutputArray lines, double rho, double theta, int threshold, double minLineLength=0, double maxLineGap=0 )

Parameters:

image – 8-bit, single-channel binary source image. The image may be modified by the function.

lines – Output vector of lines. Each line is represented by a4-element vector , where and are the ending points of eachdetected line segment.

rho – Distance resolution of the accumulator in pixels.

theta – Angle resolution of the accumulator in radians.

threshold – Accumulator threshold parameter. Only those lines arereturned that get enough votes().

minLineLength – Minimum line length. Line segments shorter than thatare rejected.

maxLineGap – Maximum allowed gap between points on the same line tolink them

我的问题是

minLineLength 和 ma​​xLineGap 是以像素为单位测量的吗？或者什么？

Answer 1

翻阅旧的 Intel OpenCV 手册，您可以看到它将 LineLength 描述为 Pixels http://opencv.jp/opencv-1.0.0_org/docs/opencvman_old.pdf

It retrieves no more than linesNumber line segments; each of those must be not shorter than lineLength pixels.

像素在这里似乎是最合乎逻辑的。 Rho，累加器的距离分辨率定义为以像素为单位。

此处的示例显示使用的值为 30:
http://www.scribd.com/doc/77374092/155/cv-HoughLinesP