JPH044354U

JPH044354U -

Info

Publication number: JPH044354U
Application number: JP4212390U
Authority: JP
Priority date: 1990-04-20
Filing date: 1990-04-20
Publication date: 1992-01-16

Description

[Brief explanation of the drawing]

第１図はこの考案の一実施例を示す構成図、第
２図は従来の画像処理型交通流計測装置を示す構
成図、第３図は画像処理の過程を示す説明図であ
る。図において、１はＡ／Ｄコンバータ、２は画像
メモリ、３は照明濃度検出回路、４は路面濃度検
出回路、５は２値化レベル決定回路、６は２値画
像メモリ、７は水平方向投影回路、８は車両特徴
検出回路、９は車両位置判定回路、１０はビデオ
信号入力、１１は車両位置検出データ、１２は最
大値ホールド回路、１３は照明判別回路、Ａは階
調画像と照明エリア、路面エリア図、Ｂは２値化
しきい値関係図、Ｃは２値画像、Ｄは水平方投影
データ、Ｅは投影データピーク部分ライン上の水
平方向サーチである。尚、図中同一符号は同一ま
たは相当部分を示す。 FIG. 1 is a block diagram showing an embodiment of this invention, FIG. 2 is a block diagram showing a conventional image processing type traffic flow measuring device, and FIG. 3 is an explanatory diagram showing the process of image processing. In the figure, 1 is an A/D converter, 2 is an image memory, 3 is an illumination density detection circuit, 4 is a road surface density detection circuit, 5 is a binarization level determination circuit, 6 is a binary image memory, and 7 is a horizontal projection 8 is a vehicle feature detection circuit, 9 is a vehicle position determination circuit, 10 is a video signal input, 11 is vehicle position detection data, 12 is a maximum value hold circuit, 13 is an illumination discrimination circuit, A is a gradation image and illumination area , a road surface area diagram, B is a binarization threshold relationship diagram, C is a binary image, D is horizontal projection data, and E is a horizontal search on the projection data peak portion line. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims

[Scope of utility model registration request]

An A/D converter that converts a video signal captured by a running vehicle from a TV camera into a digital signal;
an image memory that stores the digital signal of the D converter as a still image; an illumination density detection circuit that detects the gradation density of a predetermined illumination area from the gradation image signal of the image memory; A road surface density detection circuit that detects the gradation density of the road surface area, a maximum value hold circuit that holds the maximum value of the lighting density detection data from the lighting density detection circuit, and a maximum value hold circuit that holds the maximum value of the lighting density detection data from the lighting density detection circuit. an illumination discrimination circuit that compares it with a predetermined value and outputs illumination concentration detection data if it is equal to or greater than the predetermined value, and outputs the maximum value of the illumination concentration detection data from a maximum value hold circuit if it is less than the predetermined value; ,
2 based on the illumination density level signal from the illumination discrimination circuit and the road surface density detection data from the road surface density detection circuit.
A binarization level determination circuit that determines a digitization threshold, and a binary system that binarizes the gradation image signal in the image memory using the binarization threshold determined by the binarization level determination circuit and stores it as a binary image. An image memory, a horizontal projection circuit that projects a binary image in the horizontal direction, a vehicle feature detection circuit that searches on the peak line of the horizontal projection data and detects the characteristics of the vehicle lamp, and from the result of feature detection. It is equipped with a vehicle position determination circuit that determines the vehicle position within an image, and determines the density of the illumination lamp.When the density decreases, the maximum value of the illumination lamp density up to that point is used to determine the binarization threshold. An image processing device characterized by: