White turbid state diagnostic apparatus
First Claim
1. A white turbid state diagnostic apparatus, comprisingan imager that is installed on a vehicle and observes a periphery of the vehicle via a lens, the imager having a photoelectric convertor that converts a light signal of the observed periphery of the vehicle into an image signal;
- a region detector that detects a region from the image signal, the region being constituted by pixels having brightness values over a predetermined brightness and being in a substantially circular shape having a predetermined area or more;
a brightness gradient calculator that calculates a brightness gradient on a line which is directed from a predetermined position in a predetermined direction based on brightness values of pixels on the line in the region; and
a white turbid level calculator that calculates a white turbid level of the lens based on the brightness gradient,wherein the white turbid level calculator includes;
a brightness gradient average value calculator that calculates an average value of the brightness gradient calculated on the line to obtain a white turbid level;
a similarity calculator that calculates a similarity of regions detected from image signals imaged at different timings; and
a certainty determiner that determines a certainty of the white turbid level according to a period where high similarities are continuously calculated,wherein the certainty determiner updates the average value of the white turbid levels calculated in the previous processing and stores the updated average value, andwherein the certainty determiner calculates an error from the updated average value and the previous average value to determine a certainty of the white turbid level.
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Accused Products
Abstract
A white turbid state diagnostic apparatus has an imaging part installed on a vehicle and configured to convert a light signal from a periphery of the vehicle into an image signal, a region detection part configured to detect a region from the image signal, the region being constituted by pixels having brightness values over a predetermined brightness and being in a substantially circular shape having a predetermined area or more, a brightness gradient calculation part configured to calculate a brightness gradient on a line which is directed from a predetermined position in a predetermined direction based on brightness values of pixels on the line in the region, and a white turbid level calculation part configured to calculate a white turbid level of the lens based on the brightness gradient.
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Citations
12 Claims
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1. A white turbid state diagnostic apparatus, comprising
an imager that is installed on a vehicle and observes a periphery of the vehicle via a lens, the imager having a photoelectric convertor that converts a light signal of the observed periphery of the vehicle into an image signal; -
a region detector that detects a region from the image signal, the region being constituted by pixels having brightness values over a predetermined brightness and being in a substantially circular shape having a predetermined area or more; a brightness gradient calculator that calculates a brightness gradient on a line which is directed from a predetermined position in a predetermined direction based on brightness values of pixels on the line in the region; and a white turbid level calculator that calculates a white turbid level of the lens based on the brightness gradient, wherein the white turbid level calculator includes; a brightness gradient average value calculator that calculates an average value of the brightness gradient calculated on the line to obtain a white turbid level; a similarity calculator that calculates a similarity of regions detected from image signals imaged at different timings; and a certainty determiner that determines a certainty of the white turbid level according to a period where high similarities are continuously calculated, wherein the certainty determiner updates the average value of the white turbid levels calculated in the previous processing and stores the updated average value, and wherein the certainty determiner calculates an error from the updated average value and the previous average value to determine a certainty of the white turbid level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification