Light source detection apparatus and method as well as image processing method

Abstract

The invention relates to the field of image processing technology, particularly to a light source detecting equipment and method as well as an image processing method, which are used for gathering images corresponding to the object light source and obtaining sample pixel points of images corresponding to the object light source; computing color parameters of images corresponding to the object light source according to the sample pixel points; comparing the color parameters of images corresponding to the object light source with preset color parameters of various standard light sources, thereby determining a standard light source matched with the object light source. The technical solution of the invention can accurately detect the light source with simple operation.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to a light source detection device and method and an image processing method. Background technique [0002] In digital still cameras, digital video cameras, and other electronic image pickup devices, the scene is picked up as an image through the response of a CCD (charge-coupled device) or other photoelectric sensor; however, since generally, R, G, B, or other The sensor response balance between color channels is constant, so in order to form an image in a natural-looking state according to the scene lighting, the detection of the corresponding light source in the scene and the processing of the picked-up image are necessary. Without detection of the light source and processing of the image, what would normally be recognized as a colorless object by the viewer of the image will be reproduced in the image as colored, or the object will be reproduced in a color diffe...

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Problems solved by technology

[0005] Collect the image corresponding to the detected light source, and the image width is wd, and the height is ht, then the number of pixels in the image is wd*ht, and 5 standard light sources are pre-calibrated, and wd*ht pixels in the image corresponding to the detected light source The R, G, and B values ​​of the points are compared and detected with the R, G, and B values ​​of each pre-calibrated standard light source one by one, and the comparison and detection process of each pixel in the image corresponding to the detected light source is set as one operation, then it is There are a total of 1*5*wd*ht operations to detect the image corresponding to the light source. This detection method has a large amount of computation and cannot detect the light source in time, thus affecting the processing of the image corresponding to the detected light source.

[0006] After the light source is detected, the prior art obtains the weighting factor in the process of image processing by determining the number of pixels in the image corresponding to the detected light source falling in the pre-calibrated light source. The physical meaning of the weighting factor thus obtained is not accurate enough, because the falling The number of pixels in the pre-calibrated light source is not a simple proportional relationship with the color temperature of the light source, thus affecting the accuracy of the obtained correction parameters

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