Vehicular image pickup device and image capturing method
First Claim
1. An image capturing method, comprising the steps of:
- capturing a driving image by an image capturing unit;
obtaining a grayscale quantity distribution of a plurality of pixels of the driving image on a plurality of grayscale levels;
numbering the pixels sequentially in a direction from a highest grayscale level to a lowest grayscale level among the grayscale levels according to the grayscale quantity distribution until the numbering reaches a predetermined number; and
adjusting a fill light intensity of a fill light unit or a gain of the image capturing unit according to the grayscale level associated with the pixel numbered with the predetermined number;
wherein the grayscale levels are divided into a first grayscale section, a second grayscale section, a third grayscale section and a fourth grayscale section sequentially in the direction from the highest grayscale level to the lowest grayscale level, and the step of adjusting the fill light intensity or the gain further comprises;
decreasing the fill light intensity or the gain if the grayscale level associated with the pixel numbered with the predetermined number falls inside the first grayscale section;
not adjusting the fill light intensity or the gain if the grayscale level associated with the pixel numbered with the predetermined number falls inside the second grayscale section or the fourth grayscale section; and
increasing the fill light intensity or the gain if the grayscale level associated with the pixel numbered with the predetermined number falls inside the third grayscale section.
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Abstract
A vehicular image pickup device includes an image capturing unit, a fill light unit and a processing unit. The image capturing unit captures driving images. The fill light unit provides a fill light. The processing unit obtains a grayscale quantity distribution of pixels of the driving images on a plurality of grayscale levels. The processing unit numbers the pixels sequentially in the direction from the highest grayscale level to the lowest grayscale level according to the grayscale quantity distribution until the numbering reaches a predetermined number. The processing unit adjusts a fill light intensity of the fill light unit or a gain of the image capturing unit according to the grayscale level of the pixel whose number is the predetermined number.
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Citations
22 Claims
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1. An image capturing method, comprising the steps of:
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capturing a driving image by an image capturing unit; obtaining a grayscale quantity distribution of a plurality of pixels of the driving image on a plurality of grayscale levels; numbering the pixels sequentially in a direction from a highest grayscale level to a lowest grayscale level among the grayscale levels according to the grayscale quantity distribution until the numbering reaches a predetermined number; and adjusting a fill light intensity of a fill light unit or a gain of the image capturing unit according to the grayscale level associated with the pixel numbered with the predetermined number; wherein the grayscale levels are divided into a first grayscale section, a second grayscale section, a third grayscale section and a fourth grayscale section sequentially in the direction from the highest grayscale level to the lowest grayscale level, and the step of adjusting the fill light intensity or the gain further comprises; decreasing the fill light intensity or the gain if the grayscale level associated with the pixel numbered with the predetermined number falls inside the first grayscale section; not adjusting the fill light intensity or the gain if the grayscale level associated with the pixel numbered with the predetermined number falls inside the second grayscale section or the fourth grayscale section; and increasing the fill light intensity or the gain if the grayscale level associated with the pixel numbered with the predetermined number falls inside the third grayscale section. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A vehicular image pickup device, comprising:
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an image capturing unit for capturing a driving image; a fill light unit for providing a fill light; and a processing unit for obtaining a grayscale quantity distribution of a plurality of pixels of the driving image on a plurality of grayscale levels, numbering the pixels sequentially in a direction from a highest grayscale level to a lowest grayscale level among the grayscale levels according to the grayscale quantity distribution until the numbering reaches a predetermined number, and adjusting a fill light intensity of the fill light unit or a gain of the image capturing unit according to the grayscale level of the pixel whose number is the predetermined number wherein the grayscale levels are divided into a first grayscale section, a second grayscale section, a third grayscale section and a fourth grayscale section sequentially in the direction from the highest grayscale level to the lowest grayscale level, allowing the processing unit to decrease the fill light intensity or the gain if the grayscale level associated with the pixel numbered with the predetermined number falls inside the first grayscale section, not to adjust the fill light intensity or the gain if the grayscale level associated with the pixel numbered with the predetermined number falls inside the second grayscale section or the fourth grayscale section, and to increase the fill light intensity or the gain if the grayscale level associated with the pixel numbered with the predetermined number falls inside the third grayscale section. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An image capturing method, comprising the steps of:
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capturing a driving image by an image capturing unit; obtaining a grayscale quantity distribution of a plurality of pixels of the driving image on a plurality of grayscale levels; numbering the pixels sequentially in a direction from a highest grayscale level to a lowest grayscale level among the grayscale levels according to the grayscale quantity distribution until the numbering reaches a predetermined number, wherein the predetermined number corresponds to a number of pixels of a predetermined size of an object image to be detected in the driving image, and wherein the object image is a subset of pixels contained within the driving image; and adjusting a fill light intensity of a fill light unit or a gain of the image capturing unit according to the grayscale level associated with the pixel numbered with the predetermined number. - View Dependent Claims (22)
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Specification