Image color normalization method
An image and color technology, applied in image enhancement, image analysis, image data processing and other directions, can solve the problem of high difficulty in unifying color effects, and achieve the effect of improving the overall effect, reducing the color difference and improving the processing efficiency.
Pending Publication Date: 2020-07-10
CHONGQING SURVEY INST
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Problems solved by technology
[0004]
Based on this, it is necessary to address the above problems and provide an image color normalization method to solve the problem of high difficulty in unifying the overall color effect of oblique aerial photography results
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[0021] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without departing from the connotation of the present invention, so the present invention is not limited by the specific implementations disclosed below.
[0022] It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected ...
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The invention discloses an image color normalization method, and the method comprises the following steps: making a first orthoimage by using a satellite image covering a full measurement area or an aerial image with reduced resolution to determine a color main fundamental tone, acquiring an image positioning and attitude determination parameter through aerial triangulation, and making a second orthoimage by combining a digital elevation model and a downward-looking image to reduce resolution; performing color uniformization processing on the second orthoimage by referring to the color main fundamental tone, and migrating the color information of the second orthoimage after color uniformization pixel by pixel to the original oblique aerial images of all visual angles according to the imagepositioning and attitude determination parameters. According to the invention, during different time-phase and large-range image normalization processing, synchronous normalization of multi-view original high-resolution image colors can be realized only by performing manual color uniformization intervention on the low-resolution image color of a downward view angle, and the image color normalization processing efficiency can be significantly improved.
Description
technical field [0001] The invention relates to the technical field of remote sensing image processing, in particular to an image color normalization method. Background technique [0002] The quality of remote sensing image products depends not only on its mathematical precision, but also on its color information. An excellent video product should have a display effect with full color, clear layers and moderate contrast. In addition to being affected by atmospheric refraction, oblique aerial photography will cause image distortion and color inconsistency, there will also be color tone differences between images acquired by multiple lenses and multiple perspectives, which not only affects the visual interpretation of the image, but also affects the spatial interpretation of the image. The translation brought difficulties and compromised the quality of subsequent video products. Therefore, image processing such as color normalization is required to eliminate uneven brightnes...
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Login to View More IPC IPC(8): G06T5/00G06T11/40H04N9/73
CPCG06T11/40H04N9/73G06T2207/10032G06T2207/10024G06T5/92
Inventor 陈良超周智勇王快胡开全张俊前欧阳晖
Owner CHONGQING SURVEY INST