match histograms
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Old 1 Week Ago   #1
Guanaco
 
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Location: Southern Tennessee, U.S.
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Default match histograms

Does anyone no of a way to automatically match color, contrast etc from one photo to another?

When I was in a previous life (actually working) we used a small utility program that allowed us to semi automatically match contrast brightness and color from one photo to another.

The only requirement was that you had identical areas even if not the entire image.

The use was in aerial photography of large areas (county + equalling sometimes in excess of 3-4000 images) where it was virtually impossible to have identical conditions from one photo day to the next. time of day, sun angle, how long since last rain, has the vegetation changed etc.

operation was simple enough. All you did was to draw a select area on both photos as exact areas on both as you could then identify the source selection area and then the target selection area. The software would subtract pixel value of the source from the pixel value of the target and then take that result and adjust the individual pixel values for target photo so that the target photo pixels were identical to the source. It worked surprisingly well.

It is not fool proof as the operator needs to pick feature areas that he/she would judge should not have changed. the amount of detail ie, the altitude the photo was taken (scale)

This was originally a stand alone utility for the Imagestation and was called Imagestation Raster Utilities. I believe it is now wrapped or bundled into a GIS product called Geomedia ...? basically no longer stand alone.

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