An image processing system includes a first image processing apparatus and a second image processing apparatus. The first image processing apparatus includes a first image obtaining module, a first image extraction module, a first density extraction module, a first feature conversion module, a register module. The first image obtaining module obtains an image of an object having a seal impressed on a face thereof and having a film formed or laminated on the face thereof. The second image processing apparatus includes a second image obtaining module, a second image extraction module, a second density extraction module, a second feature conversion module, and a collation module.