Presents an image coding model that separates edge information from texture information. Edges are detected by means of a wavelet transform modulus. An image approximation is reconstructed from edges selected by a threshold operation. A texture image is obtained by subtracting the reconstructed image from the original one. The texture information is decomposed using a scheme based on an orthonormal-basis wavelet decomposition followed by a threshold operation. The authors reconstruct the original image by obtaining edge image approximation and texture image approximation from an inverse process. They show the results of applying this method to astronomical images.< >