Methods and apparatuses for image processing
First Claim
1. A machine readable non-transient storage medium containing executable computer program instructions which when executed by a data processing system cause said system to perform a method of image processing, the method comprising:
- detecting one or more regions in a first image of a high dynamic range scene according to a threshold;
providing weights distributed over pixels of the first image according to the regions, wherein weights of pixels inside the regions and weights of pixels outside the regions transition smoothly in between according to a weight function, wherein the weight function specifies more than three separate weight values which change monotonically for the smooth transition between the pixels inside the region to the pixels outside the region; and
blending the first image and a second image of the scene to generate a third image according to the weights based on the one or more regions.
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Abstract
Methods and apparatuses for generating a low dynamic range image for a high dynamic range scene. In one aspect, a method to generate a low dynamic range image from a high dynamic range image, includes: determining one or more regions of the high dynamic range image containing pixels having values that are outside a first range and inside a second range; computing a weight distribution from the one or more regions; and generating the low dynamic range image from the high dynamic range image using the weight distribution. In another aspect, a method of image processing, includes: detecting one or more regions in a first image of a high dynamic range scene according to a threshold to generate a mask; and blending the first image and a second image of the scene to generate a third image using the mask.
20 Citations
21 Claims
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1. A machine readable non-transient storage medium containing executable computer program instructions which when executed by a data processing system cause said system to perform a method of image processing, the method comprising:
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detecting one or more regions in a first image of a high dynamic range scene according to a threshold; providing weights distributed over pixels of the first image according to the regions, wherein weights of pixels inside the regions and weights of pixels outside the regions transition smoothly in between according to a weight function, wherein the weight function specifies more than three separate weight values which change monotonically for the smooth transition between the pixels inside the region to the pixels outside the region; and blending the first image and a second image of the scene to generate a third image according to the weights based on the one or more regions. - View Dependent Claims (2, 3, 4, 5)
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6. A method to generate an image, the method comprising:
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detecting one or more regions in a first image of a high dynamic range scene according to a threshold; providing weights distributed over pixels of the first image according to the regions, wherein weights of pixels inside the regions and weights of pixels outside the regions transition smoothly in between according to a weight function, wherein the weight function specifies more than three separate weight values which change monotonically for the smooth transition between the pixels inside the region to the pixels outside the region; and blending the first image and a second image of the scene to generate a third image according to weights based on the one or more regions. - View Dependent Claims (7, 8, 9, 10)
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11. A machine readable non-transient storage medium storing executable instructions that when executed cause a system to perform a method of image processing, the method comprising:
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detecting one or more regions in a first image of a high dynamic range scene according to a threshold to generate a mask; providing weights distributed over pixels of the first image according to the mask, wherein weights of pixels inside the regions and weights of pixels outside the regions transition smoothly in between according to a weight function, wherein the weight function specifies more than three separate weight values which change monotonically for the smooth transition between the pixels inside the region to the pixels outside the region; and blending the first image and a second image of the scene to generate a third image using the weights based on the mask. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. An image capturing device, comprising:
memory; an image sensing device coupled to the memory to generate a plurality of images of a scene with a plurality of exposure durations; and a processing circuit coupled to the image sensing device, the processing circuit to detect one or more regions in a first image of the plurality of image according to a threshold to generate a mask, the processing circuit to blur the mask to generate a weight distribution, and the processing circuit to blend the first image and a second image of the plurality of images to generate a third image according to the weight distribution. - View Dependent Claims (19, 20, 21)
Specification