opencv - openCV的colormap转换是线性的吗？

Question

我有一个灰度图像(即 1 个 channel )。我正在使用 opencv 函数 applyColorMap() 来改进可视化。例如，如果我有下面的代码

applyColorMap(imgGray, imgOut, COLORMAP_RAINBOW);

有人知道颜色映射转换是否是线性的吗？

_{(来源:opencv.org)}

Answer 1

opencv 函数使用的颜色映射:applyColorMap 在它们之间具有线性关系。它们基于 GNU Octave / Matlab颜色图

Graphics functions that use pseudocolor - mesh, surf, pcolor, and others - map a color matrix, c, whose values are in the range [cmin, cmax], to an array of indices, k, in the range [1, m]. The values of cmin and cmax are either min(min(c)) and max(max(c)), or are specified by caxis. The mapping is linear, with cmin mapping to index 1 and cmax mapping to index m. The indices are then used with the colormap to determine the color associated with each matrix element. reference