Machine for preparing and dispensing a beverage, such as tea, coffee, hot chocolate, cold chocolate, milk, soup or baby food, such machine comprising: - an extraction unit for extracting a beverage ingredient capsule to form said beverage, e.g. a unit having a first part and a second part that are relatively movable between a distant position for inserting and/or removing a capsule and a close position, such as a close position in which the first and second parts delimit an extraction chamber, for securing and extracting such capsule, optionally at least one of said parts has a capsule opener e.g. one or more capsule piercers and/or at least one of said parts has an opening for an inflow of liquid to be mixed with an ingredient contained in such capsule; - a control unit for controlling the extraction unit to extract such capsule, such as a control unit powered by the mains e.g. via an electric cord; - an outlet for dispensing said beverage formed by extracting such capsule to a user-receptacle, such as a cup or a mug, located in a receptacle placing area, such as on a receptacle support e.g. an external placement support on which such machine is located or a machine support e.g. a movable or removable machine support, to collect said beverage, - a capsule recognition module for recognizing a capsule inserted in said machine at a capsule recognition position , the capsule recognition module comprising a camera for capturing an image of at least part of said capsule in said capsule recognition position , - at least one source of light, for example at least one LED , to light up a capsule at said capsule recognition position , wherein the capsule recognition module comprises a diffusor for diffusing the light of said at least one source of light towards said capsule recognition position , characterized in that the diffusor further comprises protruding elements formed on its inner surface in order to prevent the light from reaching directly the capsule recognition position . - an extraction unit for extracting a beverage ingredient capsule to form said beverage, e.g. a unit having a first part and a second part that are relatively movable between a distant position for inserting and/or removing a capsule and a close position, such as a close position in which the first and second parts delimit an extraction chamber, for securing and extracting such capsule, optionally at least one of said parts has a capsule opener e.g. one or more capsule piercers and/or at least one of said parts has an opening for an inflow of liquid to be mixed with an ingredient contained in such capsule; - a control unit for controlling the extraction unit to extract such capsule, such as a control unit powered by the mains e.g. via an electric cord; - an outlet for dispensing said beverage formed by extracting such capsule to a user-receptacle, such as a cup or a mug, located in a receptacle placing area, such as on a receptacle support e.g. an external placement support on which such machine is located or a machine support e.g. a movable or removable machine support, to collect said beverage, - a capsule recognition module for recognizing a capsule inserted in said machine at a capsule recognition position , the capsule recognition module comprising a camera for capturing an image of at least part of said capsule in said capsule recognition position , - at least one source of light, for example at least one LED , to light up a capsule at said capsule recognition position , wherein the capsule recognition module comprises a diffusor for diffusing the light of said at least one source of light towards said capsule recognition position , characterized in that the diffusor further comprises protruding elements formed on its inner surface in order to prevent the light from reaching directly the capsule recognition position . <EOS>