ContextCapture generates the 3D model texture from various input photos that may have been acquired in different lighting conditions.

To reduce radiometric differences between input photos in the 3D model texture, ContextCapture proposes two ways to automatically perform color equalization on the input photos.

This color equalization mode option lets you change the color equalization algorithm used to process the texture:

• Standard: the default advanced ContextCapture automatic color equalization performed on each tile independently.
• Blockwise: a new color equalization algorithm, generally more flexible than the standard algorithm, and able to deal with greater radiometric differences between images. Note that this automatic equalization is computed during the aerotriangulation for all input photos. This dispenses with the need for a second, inter-tile color equalization, sometimes needed in the Standard method.

  To have this option activated, you need to enable Blockwise color equalization in the aerotriangulation settings.

• Standard (including thermal): This mode will apply the standard color correction on the thermal photos also.

  Warning: This will change the input temperature values, and might result in incorrect output data.

• Blockwise (including thermal): this mode will apply the blockwise color correction on the thermal photos also.

  Warning: This will change the input temperature values, and might result in erroneous output data.

• None: disable color equalization. Initial color of input photos will be kept in the generated texture.

  This option should be used only if input photos have been acquired with constant and homogeneous lighting.

Example result when the input photos have different exposures: (left or top) Standard Mode; (right or bottom) Blockwise mode.