Method of displaying shot image on car reverse video system

• US 8,218,008 B2
• Filed: 01/29/2008
• Issued: 07/10/2012
• Est. Priority Date: 12/07/2007
• Status: Active Grant

• Current Assignee: Altek Corporation
• Original Assignee: Altek Corporation
• Inventors: Wu, Shie-Ching, Liao, Kuo-Hung
• Primary Examiner(s): Meky, Moustafa M
• Assistant Examiner(s): SHIU, HO T
• Application Number:
  US12/010,699
• Publication Number:
  US 20090147085A1
• Time in Patent Office: 1,624 Days
• Field of Search: None
• US Class Current: 348/148
• CPC Class Codes: G09G 2340/14 Solving problems related to the presentation of information to be displayed
• CPC Class Codes: G09G 5/00 Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators image data processing or generation, in general G06T

Abstract

A method of displaying a shot image on a car reverse video system is described, which is applicable for adjusting an image displaying angle of the car reverse video system with a fixed lens according to a distance from an obstacle. Firstly, a scene image behind the car is shot through using the lens. Then, a distance detector is activated to detect a distance from the obstacle behind the car. If the distance from the obstacle is smaller than a preset distance, a scaling ratio is set according to a ratio of the preset distance to the distance from the obstacle. Finally, according to the scaling ratio and a distance between each pixel in the scene image and a reference point, all pixel pitches are adjusted, such that the scene image is deformed, and thus achieving an effect of switching a viewing angle of the scene image.

Claims

1. A method of displaying a shot image on a car reverse video system, executed in a car reverse video system, for automatically calibrating a displaying angle of an image shot by a photographic lens with a fixed shooting angle, comprising:

shooting a scene image behind the car through using the lens;

activating a distance detector to detect a distance from an obstacle behind the car;

determining if the distance from the obstacle is smaller than a preset distance;

if yes, setting a scaling ratio according to an equation below;

Scaling Ratio=preset distance/distance between the car and the obstacle;

adjusting pixel pitches of the scene image according to the scaling ratio and distances between a reference point and all pixels in the scene image to produce an adjusted scene image; and

displaying the adjusted scene image on the car reverse video system.

2. The method of displaying a shot image on a car reverse video system as claimed in claim 1, wherein the lens is one selected from a group consisting of a common lens, a wide angle lens, and a fisheye lens.

3. The method of displaying a shot image on a car reverse video system as claimed in claim 1, wherein the step of activating a distance detector to detect the distance from the obstacle comprises:

sending an ultrasonic signal from the distance detector; and

receiving the ultrasonic signal, and calculating a distance between the obstacle and the car according to a returning time of the ultrasonic signal.

4. The method of displaying a shot image on a car reverse video system as claimed in claim 1, wherein the step of adjusting pixel pitches comprises adjusting the pixel pitches from the reference point in a radial manner.

5. The method of displaying a shot image on a car reverse video system as claimed in claim 1, wherein the step of adjusting pixel pitches further comprises:

disposing a reference line at the scene image according to the scaling ratio;

filtering out pixels above the reference line in the scene image;

increasing the remaining pixel pitches in a manner of a logarithmic scale according to a distance from the reference line;

generating a calibrated image according to the calibrated pixel, the calibrated image being the adjusted scene image that is displayed on the car reverse video system.